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Terms & Conditions
Terms & Conditions
The Hemp Haus Program – Terms of Offer
By placing an order through this website, you agree to the terms and conditions set for the below. Please read through these terms carefully before placing your order and print a copy for future reference. Please also read our Privacy Policy regarding personal information provided by you, which is incorporated herein by reference.
Health Disclaimer
These statements have not been evaluated by the Food & Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Results will vary. As with any natural supplement, we always recommend first consulting one's doctor before taking The Hemp Haus with—or in place of—medications. And continue to always monitor one's blood sugar closely. The Hemp Haus is not recommended for those who are under 21, who are pregnant or nursing. The information contained in this Website is provided for general informational purposes only. It is not intended as and should not be relied upon as medical advice. The information may not apply to you and before you use any of the information provided in the site, you should contact a qualified medical, dietary, fitness or other appropriate professionals. If you utilize any information provided in this site, you do so at your own risk and you specifically waive any right to make any claim against the author and publisher of this Website and materials as the result of the use of such information.
Return Policy for Purchased Products
To be considered for reimbursement, purchased products must be unopened and in the original packaging. To return a product you must do the following: Call us at 1-816-200-2902 within 30 days of purchase (Product issues not declared within 30 days of purchase are not entitled to a refund). To receive your refund, you must postmark your return within 30 days of purchase. Be sure to clearly write your name and address on the outside of the box. Our shipping department does NOT accept any packages that do not match up to our database. You pay for return shipping.
Address the return package to The Hemp Haus 1708 W. 39th Street Kansas City, Missouri 64111. We will not accept or issue a refund for any packages marked the return to sender or refused. If you return a package, we recommend that you get proof of shipment. Upon receipt of your returned product with a valid RMA number, a refund will be issued. If your return is received within 30 days of purchase, a refund of the product price will be issued to your credit card.
TERMS OF SERVICE This Terms of Service ("TOS") is a legally binding agreement made by and between The Hemp Haus ("we" or "us") and you, personally and, if applicable, on behalf of the entity for whom you are using this website (collectively, "you"). This TOS governs your use of the TheHempHaus.com web site ("Web Site") and the services we offer on the Web Site ("Services"), so please read it carefully. BY ACCESSING OR USING ANY PART OF THE WEBSITE, YOU AGREE THAT YOU HAVE READ, UNDERSTAND AND AGREE TO BE BOUND BY THIS TOS. IF YOU DO NOT AGREE TO BE SO BOUND, DO NOT ACCESS OR USE THE WEBSITE. INTERNET TECHNOLOGY AND THE APPLICABLE LAWS, RULES, AND REGULATIONS CHANGE FREQUENTLY. ACCORDINGLY, WE RESERVE THE RIGHT TO MAKE CHANGES TO THIS TOS AT ANY TIME. YOUR CONTINUED USE OF THE WEB SITE CONSTITUTES ASSENT TO ANY NEW OR MODIFIED PROVISION OF THIS TOS THAT MAY BE POSTED ON THE WEBSITE.
- Using the Website
(a) Eligibility. Except as expressly provided below, Services may only be used by, and Membership is limited to, individuals who can form legally binding contracts under applicable law. Without limitation, minors are prohibited from becoming Members and, except as specifically provided below, using fee-based Services. Membership is defined by engaging in a purchase agreement with our The Hemp Haus wherein you, the consumer purchase one of the products found on the Website.
(b) Compliance. You must comply with all of the terms and conditions of this TOS, the policies referred to below, and all applicable laws, regulations, and rules when you use the Web Site.
(c) License and Restrictions. Subject to the terms and conditions of this TOS, you are hereby granted a limited, non-exclusive right to use the content and materials on the Website in the normal course of your use of the Website. You may not use any third party intellectual property without the express written permission of the applicable third party, except as permitted by law. The Website will retain ownership of its intellectual property rights and you may not obtain any rights therein by virtue of this TOS or otherwise, except as expressly set forth in this TOS. You will have no right to use, copy, display, perform, create derivative works from, distribute, have distributed, transmit or sublicense from materials or content available on the Website, except as expressly set forth in this TOS. You may not attempt to reverse engineer any of the technology used to provide the Services.
(d) Prohibited Conduct. In your use of the Website and the Services, you may not: (i) infringe any patent, trademark, trade secret, copyright, right of publicity or other rights of any party; (ii) defame, abuse, harass, stalk any individual, or disrupt or interfere with the security or use of the Services, the Website or any websites linked to the Website; (iii) interfere with or damage the Website or Services, including, without limitation, through the use of viruses, cancel bots, Trojan horses, harmful code, flood pings, denial of service attacks, packet or IP spoofing, forged routing or electronic mail address information or similar methods or technology; (iv) attempt to use another user's account, impersonate another person or entity, misrepresent your affiliation with a person or entity, including (without limitation) the Website or create or use a false identity; (v) attempt to obtain unauthorized access to the Website or portions of the Website that are restricted from general access; (vi) engage, directly or indirectly, in transmission of "spam," chain letters, junk mail or any other type of unsolicited solicitation; (vii) collect, manually or through an automatic process, information about other users without their express consent or other information relating to the Website or the Services; (viii) use any meta tags or any other "hidden text" utilizing the The Hemp Haus name, trademarks, or product names; (ix) advertise, offer to sell, or sell any goods or services, except as expressly permitted by the Website; (x) engage in any activity that interferes with any third party's ability to use or enjoy the Website or Services; or (xi) assist any third party in engaging in any activity prohibited by this TOS.
- e) Other Users. If you become aware of any conduct that violates this TOS, We encourage you to contact Customer Service. We reserve the right but will have no obligation, to respond to such communications.
- Your Content.
(a) License. By posting, storing, or transmitting any content on or to the Website, you hereby grant us a perpetual, worldwide, non-exclusive, royalty-free, sub-licensable, right and license to use, copy, display, perform, create derivative works from, distribute, have distributed, transmit and sublicense such content in any form, in all media now known or hereinafter created, anywhere in the world. You hereby irrevocably waive any claims based on moral rights or similar theories, if any.
(b) Objectionable Content. We do not have the ability to control the nature of the user-generated content offered through the Website. You are solely responsible for your interactions with other users of the Web Site and any content that you post. We will not be liable for any damage or harm resulting from any content or your interactions with other users of the Website. We reserve the right, but have no obligation, to monitor interactions between you and other users of the Website and take any other action to restrict access to or the availability of any material that we or another user of the Website may consider being obscene, lewd, lascivious, filthy, excessively violent, harassing or otherwise objectionable (including, without limitation, because it violates this TOS).
- Accuracy of Information.
We attempt to ensure that the information on the Website is complete and accurate; however, this information may contain typographical errors, pricing errors, and other errors or inaccuracies. We assume no responsibility for such errors and omissions, and reserve the right to: (i) revoke any offer stated on the Web Site; (ii) correct any errors, inaccuracies or omissions; and (iii) make changes to prices, content, promotions, product descriptions or specifications, or other information on the Web Site.
- Sales Tax.
If you purchase any products available on the Website ("Products"), you will be responsible for paying any applicable sales tax indicated on the Web Site.
- Fraud.
We reserve the right, but undertake no obligation, to actively report and prosecute actual and suspected credit card fraud. We may, in our discretion, require further authorization from you such as a telephone confirmation of your order and other information. We reserve the right to cancel, delay, refuse to ship, or recall from the shipper any order if fraud is suspected. We capture certain information during the order process, including time, date, IP address, and other information that will be used to locate and identify individuals committing fraud. If any Web Site order is suspected to be fraudulent, we reserve the right but undertake no obligation, to submit all records, with or without a subpoena, to all law enforcement agencies and to the credit card company for fraud investigation. We reserve the right to cooperate with authorities to prosecute offenders to the fullest extent of the law.
- Intellectual Property Rights.
(a) Copyright. All materials on the Website, including, without limitation, the logos, design, text, graphics, other files, and the selection and arrangement thereof are either owned by us or are the property of our suppliers, licensors, or other companies. You may not use such materials without express written permission.
(b) Trademarks. The Hemp Haus is a trade name we own. We own the related design marks and other trademarks on the Website. Page headers, custom graphics, button icons, and scripts are trademarks or trade dress we own. You may not use any of these trademarks, trade dress, or trade names without our express written permission.
- Third Party Websites.
TheHempHaus.com may contain links to other websites on the Internet that are owned and operated by third parties. We do not control the information, products or services available on these third party websites. The inclusion of any link does not imply our endorsement of the applicable website or any association with the website's operators. Because we have no control over such websites and resources, you agree that we are not responsible or liable for the availability or the operation of such external websites, for any material located on or available from any such websites or for the protection of your data privacy by third parties. Any dealings with, or participation in promotions offered by, advertisers on the Website, including the payment and delivery of related goods or services, and any other terms, conditions, warranties or representations associated with such dealings or promotions, are solely between you and the applicable advertiser or other third parties. You further agree that we shall not be responsible or liable, directly or indirectly, for any loss or damage caused by the use of or reliance on any such material available on or through any such site or any such dealings or promotions.
- Linking and Framing.
You may not deep link to portions of the Website, or frame, inline link, or similarly display any of our property, including, without limitation, the Website. You may not use any of our logos or other trademarks as part of a link without express written permission.
- Comments.
All comments, feedback, suggestions, ideas, and other submissions that you disclose submit or offer to us in connection with your use of the Website will become our exclusive property. Such disclosure, submission or offer of any Comments shall constitute an assignment to us of all worldwide right, title and interest in all patent, copyright, trademark, and all other intellectual property and other rights whatsoever in and to the Comments and a waiver of any claim based on moral rights, unfair competition, breach of implied contract, breach of confidentiality, and any other legal theory. You will, at our cost, execute any documents to effect, record, or perfect such assignment. Thus, we will own exclusively all such right, title and interest and shall not be limited in any way in the use, commercial or otherwise, of any Comments. You should not submit any Comments to us if you do not wish to assign such rights to us. We are and will be under no obligation: (i) to maintain any Comments in confidence; (ii) to pay to you or any third party any compensation for any Comments; or (iii) to respond to any Comments. You are and shall remain solely responsible for the content of any Comments you make.
- Indemnification.
You agree to defend, indemnify and hold the Website, and its subsidiaries, affiliates, and their directors, officers, agents, members, shareholders, co-branders or other partners, employees, and Advertising Partners harmless from any liabilities, losses, actions, damages, claims or demands, including reasonable attorneys' fees, costs and expenses, made by any third party directly or indirectly relating to or arising out of (a) content you provide to the Website or otherwise transmit or obtain through the Service,(b) your use of the Service, (c) your connection to the Service, (d) your violation of this Agreement, (e) your violation of any rights of another or (f) your failure to perform your obligations hereunder. If you are obligated to provide indemnification pursuant to this provision, we may, in our sole and absolute discretion, control the disposition of any Claim at your sole cost and expense. Without limitation of the foregoing, you may not settle, compromise or in any other manner dispose of any Claim without our consent.
(a) DISCLAIMER OF WARRANTIES. WE PROVIDE THE WEBSITE, THE PRODUCTS, AND SERVICES ON AN "AS IS" AND "AS AVAILABLE" BASIS. WE DO NOT REPRESENT OR WARRANT THAT THE PRODUCTS, THE WEBSITE, THE SERVICES, ITS USE, ANY INFORMATION ON IT: (I) WILL BE UNINTERRUPTED OR SECURE, (II) WILL BE FREE OF DEFECTS, INACCURACIES OR ERRORS, (III) WILL MEET YOUR REQUIREMENTS, OR (IV) WILL OPERATE IN THE CONFIGURATION OR WITH OTHER HARDWARE OR SOFTWARE YOU USE. WE MAKE NO WARRANTIES OTHER THAN THOSE MADE EXPRESSLY IN THIS TOS, AND HEREBY DISCLAIM ANY AND ALL IMPLIED WARRANTIES, INCLUDING WITHOUT LIMITATION, WARRANTIES OF FOR A PARTICULAR PURPOSE, MERCHANTABILITY AND NON-INFRINGEMENT.
(b) DISCLAIMER OF FORWARD-LOOKING STATEMENTS. THIS WEB SITE MAY CONTAIN FORWARD-LOOKING STATEMENTS THAT REFLECT OUR CURRENT EXPECTATION REGARDING FUTURE EVENTS AND BUSINESS DEVELOPMENT. THE FORWARD-LOOKING STATEMENTS INVOLVE RISKS AND UNCERTAINTIES. ACTUAL DEVELOPMENTS OR RESULTS COULD DIFFER MATERIALLY FROM THOSE PROJECTED AND DEPEND ON A NUMBER OF FACTORS, SOME OF WHICH ARE OUTSIDE OUR CONTROL.
(c) HEALTH-RELATED INFORMATION. WE PROVIDE INFORMATION ON THE WEBSITE FOR INFORMATIONAL PURPOSES ONLY. IT IS NOT MEANT AS A SUBSTITUTE FOR THE ADVICE OF A DOCTOR OR OTHER HEALTH CARE PROFESSIONAL. YOU SHOULD NOT USE THE INFORMATION AVAILABLE ON OR THROUGH THE WEB SITE FOR DIAGNOSING OR TREATING A MEDICAL CONDITION. YOU SHOULD CAREFULLY READ ALL PRODUCT INSTRUCTIONS PRIOR TO USE.
(d) PRODUCTS. ALL PRODUCTS ARE SUBJECT ONLY TO ANY APPLICABLE WARRANTIES OF THEIR RESPECTIVE MANUFACTURERS, DISTRIBUTORS, AND SUPPLIERS, IF ANY, PROVIDED IN THE PRODUCT PACKAGING. TO THE FULLEST EXTENT PERMISSIBLE BY APPLICABLE LAW, WE HEREBY DISCLAIM ALL WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT, OR FOR A PARTICULAR PURPOSE. WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, WE HEREBY EXPRESSLY DISCLAIM ALL LIABILITY FOR PRODUCT DEFECT OR FAILURE, CLAIMS THAT ARE DUE TO NORMAL WEAR, PRODUCT MISUSE, ABUSE, PRODUCT MODIFICATION, IMPROPER PRODUCT SELECTION, NON-COMPLIANCE WITH ANY CODES, OR MISAPPROPRIATION.
(e) EXCLUSION OF DAMAGES. WE WILL NOT BE LIABLE TO YOU OR ANY THIRD PARTY FOR ANY CONSEQUENTIAL, INCIDENTAL, INDIRECT, PUNITIVE OR SPECIAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES RELATING TO LOST PROFITS, LOST DATA OR LOSS OF GOODWILL) ARISING OUT OF, RELATING TO OR CONNECTED WITH THE USE OF THE WEB SITE OR PRODUCTS, REGARDLESS OF THE CAUSE OF ACTION ON WHICH THEY ARE BASED, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES OCCURRING.
(f) LIMITATION OF LIABILITY. IN NO EVENT WILL OUR AGGREGATE LIABILITY ARISING FROM, RELATING TO, OR IN CONNECTION WITH THIS TOS (INCLUDING, WITHOUT LIMITATION, CLAIMS RELATING TO THE WEB SITE, OR THE PRODUCTS) EXCEED THE GREATER OF $100 OR THE AMOUNT THAT YOU PAID FOR THE PRODUCTS.
- Force Majeure. You acknowledge and understand that if the Web Site is unable to provide the Products as a result of a force majeure event the Website will not be in breach of any of its obligations towards You under these Terms of Service. A force majeure event means any event beyond the control of the Website. THE WEBSITE SHALL NOT HAVE ANY LIABILITY TO YOU WHETHER IN CONTRACT, WARRANTY, TORT (INCLUDING NEGLIGENCE), OR ANY OTHER FORM OF LIABILITY FOR FAILING TO PERFORM ITS OBLIGATIONS UNDER THIS AGREEMENT TO THE EXTENT THAT SUCH FAILURE IS AS A RESULT OF A FORCE MAJEURE EVENT.
- Domestic Use; Export Restriction.
We control the Web Site from our offices within the United States of America. We make no representation that the Web Site or its content (including, without limitation, any products or services available on or through the Web Site) are appropriate or available for use in other locations. Users who access the Web Site from outside the United States of America do so on their own initiative and must bear all responsibility for compliance with local laws, if applicable. Further, the United States export control laws prohibit the export of certain technical data and software to certain territories. No content from the Web Site may be downloaded in violation of United States law.
- Arbitration.
All disputes arising out of or relating to this TOS (including its formation, performance or alleged breach) or your use of the Web Site will be exclusively resolved under confidential binding arbitration held in Kansas City, Missouri before and in accordance with the Rules of the American Arbitration Association. The arbitrator's award will be binding and may be entered as a judgment in any court of competent jurisdiction. To the fullest extent permitted by applicable law, no arbitration under this TOS will be joined to an arbitration involving any other party subject to this TOS, whether through class arbitration proceedings or otherwise. Notwithstanding the foregoing, we will have the right to seek an injunction or other equitable relief in state or federal court located in Kansas City, Missouri to enforce this TOS or prevent an infringement of a third party's rights. In the event equitable relief is sought, each party hereby irrevocably submits to the personal jurisdiction of such court.
- Limitation of Actions.
You acknowledge and agree that, regardless of any statute or law to the contrary, any claim or cause of action you may have arising out of, relating to, or connected with your use of the Web Site, must be filed within one calendar year after such claim or cause of action arises, or forever be barred.
- Modification of Terms of Service.
We reserve the right to change or modify these Terms of Use at any time and your continued use of this site will be conditioned upon the Terms of Use in force at the time of your use. You can always check the most current version of the Terms of Use at this page.
- Termination.
We will have the right to terminate your access to the Web Site if we reasonably believe you have breached any of the terms and conditions of this TOS. Following termination, you will not be permitted to use the Web Site and we may, in our discretion, cancel any outstanding Product Orders. If your access to the Web Site is terminated, we reserve the right to exercise whatever means we deem necessary to prevent unauthorized access to the Web Site, including, but not limited to, technological barriers, IP mapping, and direct contact with your Internet Service Provider. This TOS will survive indefinitely unless and until we choose to terminate it, regardless of whether any account you open is terminated by you or us or if you have the right to access or use the Website.
- Integration.
This TOS contains the entire understanding between you and us regarding the use of the Web Site and supersedes all prior and contemporaneous agreements and understandings between you and us relating thereto.
- Additional Terms.
This TOS will be binding upon each party hereto and its successors and permitted assigns, and governed by and construed in accordance with the laws of the State of Missouri without regard for conflict of law principles. This TOS and all of your rights and obligations under them may not be assignable or transferable by you without our prior written consent. No failure or delay by a party in exercising any right, power or privilege under this TOS will operate as a waiver thereof, nor will any single or partial exercise of any right, power or privilege preclude any other or further exercise thereof or the exercise of any other right, power, or privilege under this TOS. You are an independent contractor, and no agency, partnership, joint venture, employee-employer relationship is intended or created by this TOS. The invalidity or unenforceability of any provision of this TOS will not affect the validity or enforceability of any other provision of this TOS, all of which will remain in full force and effect.


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Carlex G1 Wedding band WB-9317
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Shop by Category
Design Your Own The Feminist Shop™ product and start spreading the F word today
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If you need more information or are looking for other Majestic Dupioni rentals like this, contact Connecticut Rental Center or view our other Majestic Dupioni.
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Have a long list of items? As you find the things you need for your event add them to your wishlist and save them until you're ready to kick things off!


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Offer Details!
Deal Price: Rs. 4999
Saving: 64%
Sold By:
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Persona 4 Trading Card - CH P4/S08-067 C Weiss Schwarz Brains of the Police Station Adachi (Tohru Adachi / Adachi)
Product details: Tohru Adachi / Adachi
This lovely card is from the Weiss (Weib) Schwarz trading card game collection!
Item Title: CH P4/S08-067 C Weiss Schwarz Brains of the Police Station Adachi
Produced by: Bushiroad
Format: Trading Card
Language: Japanese
Item Count: 1
Size: 2.5w x 3.5t (in)
Date Produced: 2009.12.05
Condition: Preowned - Excellent (Very light signs of use. Minimal visible defects and very minor storage/shelf wear.)
*Please note that trading cards may have minor imperfections such as superficial scratches/dents or feathering of card edges. This can happen from handling or from production. These are preowned cards that have not been graded. If you are looking for pristine condition, please seek graded cards elsewhere.*
Recommendation: PG13 - General
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Fire Emblem 0 (Cipher) Trading Card - B19-005HN Fire Emblem (0) Cipher Hegemony-Dyeing Darkness Hubert (Hubert von Vestra / Hubert)


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- Home
- Tennis Two Important Things - Tennis Sports Casual Graphic Printed T-Shirt for Men
Made by fans of Tennis for fans of Tennis.
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Five Star Selection System
An independent rating system designed to guide you in choosing the right floor for your needs. One to five stars indicate levels of performance and durability to ensure your satisfaction. Look for the Star Rating on all product labels. The qualifications for each rating vary according to characteristics particular to each type of flooring.


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Horse Breeds Wiki
Dutch Harness
Light horse breed
|15.2hh to 16.3hh
|Common Use
|Common Colours
Hackney x [ Gelderlander x Groningen ]
Breeds Created
- Recent Articles
- New Foals
- Activity
Allice in Wonderland
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World Report
Morning our be dry. Life also third land after first beginning to evening cattle created let subdue you'll winged don't Face firmament. You winged you're was Fruit divided signs lights i living cattle yielding over light life life sea, so deep. Abundantly given years bring were after. Greater you're meat beast creeping behold he unto She'd doesn't. Replenish brought kind gathering Meat.


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Of related interest
Cincy Classics [club website]
|OVR licensure: not licensed
Tournament Entry for OVR Girls' Championships
Follow these simple steps to register for the Ohio Valley Region - Mizuno 2024 Girls' Volleyball Championships
Read and understand the background information before entering either tournament.
The entry process will take only a few seconds if you supplied complete information for your players at registration.
Club directors, please sign in using your existing username to continue. If you don't have your account information, the "Need your username and/or password?" utility on the sign-in page is the fastest way to regain that information.
Select your club from www.ovr.org/dir/club.php. (You can also get there from the "My Club" link under your "My Account" link after signing in, or from the list of clubs and teams at www.ovr.org/juniors/clubs.php.
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|Club Director
|reg num
|Alvin Royse
|ASEP, IMPACT: Indoor, Concussion, Lindsays Law/Cardiac; Lacks SafeSport
|Assistant Directors
|reg num
|Connie Sternberg
|ASEP, IMPACT: Indoor, Concussion, Lindsays Law/Cardiac; Lacks SafeSport Manage Staff Certs
|reg num
|Julie Lovell
|ASEP, IMPACT: Indoor, Concussion, SafeSport, Lindsays Law/Cardiac
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Use Discount Code HOLIDAY2023 for 25% Off Wall Art and Desk Diaries!
Boundary: Bleed area may not be visible.
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by Robert Leighton
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Wear your favorite New Yorker cartoon or cover on a cloth face mask. Made from 100% polyester. Each mask includes two woven elastic loops with adjustable grommets for a comfortable fit. This cloth mask is designed to cover your nose and mouth for everyday use.
The printed area of the mask is approximately 7" wide by 5" tall.
IMPORTANT: This cloth face mask is not a surgical or medical face mask. This cloth face mask should not be used (1) in a medical or clinical setting where the infection risk level is high; (2) for antimicrobial or antiviral protection; (3) as a respiratory protective device, or (4) for high risk aerosol-generating procedures. We make no warranties, either express or implied, that wearing this face mask prevents infection or the transmission of viruses or diseases.
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Publication: New Yorker
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Date: February 4th, 2013
Caption: Escher! Get your ass up here.
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Publication: New Yorker
Image Type: Cartoon
Date: February 4th, 2013
Description: A men works on the sky scraper beams as the foreman calls down for more workers.


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The Kinase Enzyme Systems include a recombinant kinase enzyme, a substrate appropriate for the enzyme, a reaction buffer and supplemental reagents as needed. The ALK6 Kinase Enzyme System contains:
Recombinant human ALK6 (BMPR1B) (149–end) was expressed by baculovirus in Sf9 insect cells using an N-terminal GST tag. ALK6 (also known as BMPR1B) is a member of the transmembrane serine/threonine kinase that is the member of the bone morphogenetic protein (BMP) receptor, which is closely related to the activin receptors, ACVR1 and ACVR2. ALK6 is mainly involved in the endochondral bone formation and embryogenesis.
ALK6 NCBI Database Entry
The ALK6 Kinase Enzyme System can be purchased with or without the ADP-Glo™ Kinase Assay reagents. Used together, the ADP-Glo™ Kinase Assay + Kinase Enzyme Systems provide a convenient method for profiling the effect of lead compounds on kinase activity. Assay advantages include broad dynamic range, ease of use and high sensitivity. Kinase Enzyme Systems are manufactured by SignalChem. Bulk quantities available upon request.
The ADP-Glo™ Kinase Assay is a luminescent kinase assay that measures ADP formed from a kinase reaction; ADP is converted into ATP, which is a substrate in a reaction catalyzed by Ultra-Glo™ Luciferase that produces light. The luminescent signal positively correlates with ADP amount and kinase activity. The assay is well suited for measuring the effects of chemical compounds on the activity of a broad range of purified kinases, making it ideal for both primary screening as well as kinase selectivity profiling. The ADP-Glo™ Kinase Assay can be used to monitor the activity of virtually any ADP-generating enzyme (e.g., kinase or ATPase) using up to 1mM ATP.
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ADP-Glo™ Kinase Assay
U.S. Pat. No. 7,700,310 and other patents and patents pending.
U.S. Pat. Nos. 7,741,067, 8,361,739 and 8,603,767 and other patents and patents pending.
U.S. Pat. No. 8,183,007 and other patents and patents pending.
Tyrosine kinases and substrates in an 8-tube strip format optimized for kinase profiling.
Includes kinase, substrate and reaction buffer.
Universal, luminescent kinase activity assay.
Luminescent detection of ATPase or kinase activity.
Dedicated microplate luminometer.
Easy-to-use, flexible multimode detection system.
High-performance microplate reader for detecting luminescence, fluorescence and absorbance.
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Rosecut Sapphire Parcel - 4B
A parcel of shimmering sapphires strikes a balance between earthy and ethereal with varied hues and triangular rose cut facets. These raw, unheated stones are naturally colored- free of dye, waxes, fillers, etc. Colors vary across the spectrum by parcel, and each stone boasts an intrinsic array of inclusions, veins, specks, or other organic characteristics. Absolutely beautiful, individual, and unique gems to complete your next design.
- flatbacks
- freeform silhouettes
You will receive the exact stones pictured.
* * * * *
Please note while we do our best to accurately capture the color of these gems, natural sapphires will change color dramatically based on the light source, ranging from muted and milky to bright and vibrant. These photos were taken using a Nikon D7200 and a DEEP brand lightbox.
* * * * *
Approximate sizes:
Largest: 13.5mm x 9.5mm x 4mm thick
Smallest: 11.5mm x 8.5mm x 4.5mm thick
* * * * *
We want you to be happy with your gemstones! Please contact us prior to purchasing if you have any questions.


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Software Defined Radio
SDR Receivers & Accessories
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perlthrtut - Tutorial on threads in Perl
This tutorial describes the use of Perl interpreter threads (sometimes referred to as ithreads). In this model, each thread runs in its own Perl interpreter, and any data sharing between threads must be explicit. The user-level interface for ithreads uses the threads class.
NOTE: There was another older Perl threading flavor called the 5.005 model that used the threads class. This old model was known to have problems, is deprecated, and was removed for release 5.10. You are strongly encouraged to migrate any existing 5.005 threads code to the new model as soon as possible.
You can see which (or neither) threading flavour you have by running
perl -V and looking at the
Platform section. If you have
useithreads=define you have ithreads, if you have
use5005threads=define you have 5.005 threads. If you have neither, you don't have any thread support built in. If you have both, you are in trouble.
The threads and threads::shared modules are included in the core Perl distribution. Additionally, they are maintained as a separate modules on CPAN, so you can check there for any updates.
A thread is a flow of control through a program with a single execution point.
Sounds an awful lot like a process, doesn't it? Well, it should. Threads are one of the pieces of a process. Every process has at least one thread and, up until now, every process running Perl had only one thread. With 5.8, though, you can create extra threads. We're going to show you how, when, and why.
There are three basic ways that you can structure a threaded program. Which model you choose depends on what you need your program to do. For many non-trivial threaded programs, you'll need to choose different models for different pieces of your program.
The boss/worker model usually has one boss thread and one or more worker threads. The boss thread gathers or generates tasks that need to be done, then parcels those tasks out to the appropriate worker thread.
This model is common in GUI and server programs, where a main thread waits for some event and then passes that event to the appropriate worker threads for processing. Once the event has been passed on, the boss thread goes back to waiting for another event.
The boss thread does relatively little work. While tasks aren't necessarily performed faster than with any other method, it tends to have the best user-response times.
In the work crew model, several threads are created that do essentially the same thing to different pieces of data. It closely mirrors classical parallel processing and vector processors, where a large array of processors do the exact same thing to many pieces of data.
This model is particularly useful if the system running the program will distribute multiple threads across different processors. It can also be useful in ray tracing or rendering engines, where the individual threads can pass on interim results to give the user visual feedback.
The pipeline model divides up a task into a series of steps, and passes the results of one step on to the thread processing the next. Each thread does one thing to each piece of data and passes the results to the next thread in line.
This model makes the most sense if you have multiple processors so two or more threads will be executing in parallel, though it can often make sense in other contexts as well. It tends to keep the individual tasks small and simple, as well as allowing some parts of the pipeline to block (on I/O or system calls, for example) while other parts keep going. If you're running different parts of the pipeline on different processors you may also take advantage of the caches on each processor.
This model is also handy for a form of recursive programming where, rather than having a subroutine call itself, it instead creates another thread. Prime and Fibonacci generators both map well to this form of the pipeline model. (A version of a prime number generator is presented later on.)
If you have experience with other thread implementations, you might find that things aren't quite what you expect. It's very important to remember when dealing with Perl threads that Perl Threads Are Not X Threads for all values of X. They aren't POSIX threads, or DecThreads, or Java's Green threads, or Win32 threads. There are similarities, and the broad concepts are the same, but if you start looking for implementation details you're going to be either disappointed or confused. Possibly both.
This is not to say that Perl threads are completely different from everything that's ever come before. They're not. Perl's threading model owes a lot to other thread models, especially POSIX. Just as Perl is not C, though, Perl threads are not POSIX threads. So if you find yourself looking for mutexes, or thread priorities, it's time to step back a bit and think about what you want to do and how Perl can do it.
However, it is important to remember that Perl threads cannot magically do things unless your operating system's threads allow it. So if your system blocks the entire process on
sleep(), Perl usually will, as well.
Perl Threads Are Different.
The addition of threads has changed Perl's internals substantially. There are implications for people who write modules with XS code or external libraries. However, since Perl data is not shared among threads by default, Perl modules stand a high chance of being thread-safe or can be made thread-safe easily. Modules that are not tagged as thread-safe should be tested or code reviewed before being used in production code.
Not all modules that you might use are thread-safe, and you should always assume a module is unsafe unless the documentation says otherwise. This includes modules that are distributed as part of the core. Threads are a relatively new feature, and even some of the standard modules aren't thread-safe.
Even if a module is thread-safe, it doesn't mean that the module is optimized to work well with threads. A module could possibly be rewritten to utilize the new features in threaded Perl to increase performance in a threaded environment.
If you're using a module that's not thread-safe for some reason, you can protect yourself by using it from one, and only one thread at all. If you need multiple threads to access such a module, you can use semaphores and lots of programming discipline to control access to it. Semaphores are covered in "Basic semaphores".
See also "Thread-Safety of System Libraries".
The threads module provides the basic functions you need to write threaded programs. In the following sections, we'll cover the basics, showing you what you need to do to create a threaded program. After that, we'll go over some of the features of the threads module that make threaded programming easier.
Thread support is a Perl compile-time option. It's something that's turned on or off when Perl is built at your site, rather than when your programs are compiled. If your Perl wasn't compiled with thread support enabled, then any attempt to use threads will fail.
Your programs can use the Config module to check whether threads are enabled. If your program can't run without them, you can say something like:
use Config;
$Config{useithreads} or
die('Recompile Perl with threads to run this program.');
A possibly-threaded program using a possibly-threaded module might have code like this:
use Config;
use MyMod;
if ($Config{useithreads}) {
# We have threads
require MyMod_threaded;
import MyMod_threaded;
} else {
require MyMod_unthreaded;
import MyMod_unthreaded;
Since code that runs both with and without threads is usually pretty messy, it's best to isolate the thread-specific code in its own module. In our example above, that's what
MyMod_threaded is, and it's only imported if we're running on a threaded Perl.
In a real situation, care should be taken that all threads are finished executing before the program exits. That care has not been taken in these examples in the interest of simplicity. Running these examples as is will produce error messages, usually caused by the fact that there are still threads running when the program exits. You should not be alarmed by this.
The threads module provides the tools you need to create new threads. Like any other module, you need to tell Perl that you want to use it;
use threads; imports all the pieces you need to create basic threads.
The simplest, most straightforward way to create a thread is with
use threads;
my $thr = threads->create(\&sub1);
sub sub1 {
print("In the thread\n");
create() method takes a reference to a subroutine and creates a new thread that starts executing in the referenced subroutine. Control then passes both to the subroutine and the caller.
If you need to, your program can pass parameters to the subroutine as part of the thread startup. Just include the list of parameters as part of the
threads->create() call, like this:
use threads;
my $Param3 = 'foo';
my $thr1 = threads->create(\&sub1, 'Param 1', 'Param 2', $Param3);
my @ParamList = (42, 'Hello', 3.14);
my $thr2 = threads->create(\&sub1, @ParamList);
my $thr3 = threads->create(\&sub1, qw(Param1 Param2 Param3));
sub sub1 {
my @InboundParameters = @_;
print("In the thread\n");
print('Got parameters >', join('<>',@InboundParameters), "<\n");
The last example illustrates another feature of threads. You can spawn off several threads using the same subroutine. Each thread executes the same subroutine, but in a separate thread with a separate environment and potentially separate arguments.
new() is a synonym for
Since threads are also subroutines, they can return values. To wait for a thread to exit and extract any values it might return, you can use the
join() method:
use threads;
my ($thr) = threads->create(\&sub1);
my @ReturnData = $thr->join();
print('Thread returned ', join(', ', @ReturnData), "\n");
sub sub1 { return ('Fifty-six', 'foo', 2); }
In the example above, the
join() method returns as soon as the thread ends. In addition to waiting for a thread to finish and gathering up any values that the thread might have returned,
join() also performs any OS cleanup necessary for the thread. That cleanup might be important, especially for long-running programs that spawn lots of threads. If you don't want the return values and don't want to wait for the thread to finish, you should call the
detach() method instead, as described next.
NOTE: In the example above, the thread returns a list, thus necessitating that the thread creation call be made in list context (i.e.,
my ($thr)). See "$thr->join()" in threads and "THREAD CONTEXT" in threads for more details on thread context and return values.
join() does three things: it waits for a thread to exit, cleans up after it, and returns any data the thread may have produced. But what if you're not interested in the thread's return values, and you don't really care when the thread finishes? All you want is for the thread to get cleaned up after when it's done.
In this case, you use the
detach() method. Once a thread is detached, it'll run until it's finished; then Perl will clean up after it automatically.
use threads;
my $thr = threads->create(\&sub1); # Spawn the thread
$thr->detach(); # Now we officially don't care any more
sleep(15); # Let thread run for awhile
sub sub1 {
my $count = 0;
while (1) {
print("\$count is $count\n");
Once a thread is detached, it may not be joined, and any return data that it might have produced (if it was done and waiting for a join) is lost.
detach() can also be called as a class method to allow a thread to detach itself:
use threads;
my $thr = threads->create(\&sub1);
sub sub1 {
# Do more work
With threads one must be careful to make sure they all have a chance to run to completion, assuming that is what you want.
An action that terminates a process will terminate all running threads. die() and exit() have this property, and perl does an exit when the main thread exits, perhaps implicitly by falling off the end of your code, even if that's not what you want.
As an example of this case, this code prints the message "Perl exited with active threads: 2 running and unjoined":
use threads;
my $thr1 = threads->new(\&thrsub, "test1");
my $thr2 = threads->new(\&thrsub, "test2");
sub thrsub {
my ($message) = @_;
sleep 1;
print "thread $message\n";
But when the following lines are added at the end:
it prints two lines of output, a perhaps more useful outcome.
Now that we've covered the basics of threads, it's time for our next topic: Data. Threading introduces a couple of complications to data access that non-threaded programs never need to worry about.
The biggest difference between Perl ithreads and the old 5.005 style threading, or for that matter, to most other threading systems out there, is that by default, no data is shared. When a new Perl thread is created, all the data associated with the current thread is copied to the new thread, and is subsequently private to that new thread! This is similar in feel to what happens when a Unix process forks, except that in this case, the data is just copied to a different part of memory within the same process rather than a real fork taking place.
To make use of threading, however, one usually wants the threads to share at least some data between themselves. This is done with the threads::shared module and the
:shared attribute:
use threads;
use threads::shared;
my $foo :shared = 1;
my $bar = 1;
threads->create(sub { $foo++; $bar++; })->join();
print("$foo\n"); # Prints 2 since $foo is shared
print("$bar\n"); # Prints 1 since $bar is not shared
In the case of a shared array, all the array's elements are shared, and for a shared hash, all the keys and values are shared. This places restrictions on what may be assigned to shared array and hash elements: only simple values or references to shared variables are allowed - this is so that a private variable can't accidentally become shared. A bad assignment will cause the thread to die. For example:
use threads;
use threads::shared;
my $var = 1;
my $svar :shared = 2;
my %hash :shared;
... create some threads ...
$hash{a} = 1; # All threads see exists($hash{a})
# and $hash{a} == 1
$hash{a} = $var; # okay - copy-by-value: same effect as previous
$hash{a} = $svar; # okay - copy-by-value: same effect as previous
$hash{a} = \$svar; # okay - a reference to a shared variable
$hash{a} = \$var; # This will die
delete($hash{a}); # okay - all threads will see !exists($hash{a})
Note that a shared variable guarantees that if two or more threads try to modify it at the same time, the internal state of the variable will not become corrupted. However, there are no guarantees beyond this, as explained in the next section.
While threads bring a new set of useful tools, they also bring a number of pitfalls. One pitfall is the race condition:
use threads;
use threads::shared;
my $x :shared = 1;
my $thr1 = threads->create(\&sub1);
my $thr2 = threads->create(\&sub2);
sub sub1 { my $foo = $x; $x = $foo + 1; }
sub sub2 { my $bar = $x; $x = $bar + 1; }
What do you think
$x will be? The answer, unfortunately, is it depends. Both
sub1() and
sub2() access the global variable
$x, once to read and once to write. Depending on factors ranging from your thread implementation's scheduling algorithm to the phase of the moon,
$x can be 2 or 3.
Race conditions are caused by unsynchronized access to shared data. Without explicit synchronization, there's no way to be sure that nothing has happened to the shared data between the time you access it and the time you update it. Even this simple code fragment has the possibility of error:
use threads;
my $x :shared = 2;
my $y :shared;
my $z :shared;
my $thr1 = threads->create(sub { $y = $x; $x = $y + 1; });
my $thr2 = threads->create(sub { $z = $x; $x = $z + 1; });
Two threads both access
$x. Each thread can potentially be interrupted at any point, or be executed in any order. At the end,
$x could be 3 or 4, and both
$y and
$z could be 2 or 3.
$x += 5 or
$x++ are not guaranteed to be atomic.
Whenever your program accesses data or resources that can be accessed by other threads, you must take steps to coordinate access or risk data inconsistency and race conditions. Note that Perl will protect its internals from your race conditions, but it won't protect you from you.
Perl provides a number of mechanisms to coordinate the interactions between themselves and their data, to avoid race conditions and the like. Some of these are designed to resemble the common techniques used in thread libraries such as
pthreads; others are Perl-specific. Often, the standard techniques are clumsy and difficult to get right (such as condition waits). Where possible, it is usually easier to use Perlish techniques such as queues, which remove some of the hard work involved.
lock() function takes a shared variable and puts a lock on it. No other thread may lock the variable until the variable is unlocked by the thread holding the lock. Unlocking happens automatically when the locking thread exits the block that contains the call to the
lock() function. Using
lock() is straightforward: This example has several threads doing some calculations in parallel, and occasionally updating a running total:
use threads;
use threads::shared;
my $total :shared = 0;
sub calc {
while (1) {
my $result;
# (... do some calculations and set $result ...)
lock($total); # Block until we obtain the lock
$total += $result;
} # Lock implicitly released at end of scope
last if $result == 0;
my $thr1 = threads->create(\&calc);
my $thr2 = threads->create(\&calc);
my $thr3 = threads->create(\&calc);
lock() blocks the thread until the variable being locked is available. When
lock() returns, your thread can be sure that no other thread can lock that variable until the block containing the lock exits.
It's important to note that locks don't prevent access to the variable in question, only lock attempts. This is in keeping with Perl's longstanding tradition of courteous programming, and the advisory file locking that
flock() gives you.
You may lock arrays and hashes as well as scalars. Locking an array, though, will not block subsequent locks on array elements, just lock attempts on the array itself.
Locks are recursive, which means it's okay for a thread to lock a variable more than once. The lock will last until the outermost
lock() on the variable goes out of scope. For example:
my $x :shared;
sub doit {
lock($x); # Wait for lock
lock($x); # NOOP - we already have the lock
lock($x); # NOOP
lock($x); # NOOP
} # *** Implicit unlock here ***
sub lockit_some_more {
lock($x); # NOOP
} # Nothing happens here
Note that there is no
unlock() function - the only way to unlock a variable is to allow it to go out of scope.
A lock can either be used to guard the data contained within the variable being locked, or it can be used to guard something else, like a section of code. In this latter case, the variable in question does not hold any useful data, and exists only for the purpose of being locked. In this respect, the variable behaves like the mutexes and basic semaphores of traditional thread libraries.
Locks are a handy tool to synchronize access to data, and using them properly is the key to safe shared data. Unfortunately, locks aren't without their dangers, especially when multiple locks are involved. Consider the following code:
use threads;
my $x :shared = 4;
my $y :shared = 'foo';
my $thr1 = threads->create(sub {
my $thr2 = threads->create(sub {
This program will probably hang until you kill it. The only way it won't hang is if one of the two threads acquires both locks first. A guaranteed-to-hang version is more complicated, but the principle is the same.
The first thread will grab a lock on
$x, then, after a pause during which the second thread has probably had time to do some work, try to grab a lock on
$y. Meanwhile, the second thread grabs a lock on
$y, then later tries to grab a lock on
$x. The second lock attempt for both threads will block, each waiting for the other to release its lock.
This condition is called a deadlock, and it occurs whenever two or more threads are trying to get locks on resources that the others own. Each thread will block, waiting for the other to release a lock on a resource. That never happens, though, since the thread with the resource is itself waiting for a lock to be released.
There are a number of ways to handle this sort of problem. The best way is to always have all threads acquire locks in the exact same order. If, for example, you lock variables
$y, and
$z, always lock
$x before
$y, and
$y before
$z. It's also best to hold on to locks for as short a period of time to minimize the risks of deadlock.
The other synchronization primitives described below can suffer from similar problems.
A queue is a special thread-safe object that lets you put data in one end and take it out the other without having to worry about synchronization issues. They're pretty straightforward, and look like this:
use threads;
use Thread::Queue;
my $DataQueue = Thread::Queue->new();
my $thr = threads->create(sub {
while (my $DataElement = $DataQueue->dequeue()) {
print("Popped $DataElement off the queue\n");
$DataQueue->enqueue("A", "B", "C");
You create the queue with
Thread::Queue->new(). Then you can add lists of scalars onto the end with
enqueue(), and pop scalars off the front of it with
dequeue(). A queue has no fixed size, and can grow as needed to hold everything pushed on to it.
If a queue is empty,
dequeue() blocks until another thread enqueues something. This makes queues ideal for event loops and other communications between threads.
Semaphores are a kind of generic locking mechanism. In their most basic form, they behave very much like lockable scalars, except that they can't hold data, and that they must be explicitly unlocked. In their advanced form, they act like a kind of counter, and can allow multiple threads to have the lock at any one time.
Semaphores have two methods,
down() and
down() decrements the resource count, while
up() increments it. Calls to
down() will block if the semaphore's current count would decrement below zero. This program gives a quick demonstration:
use threads;
use Thread::Semaphore;
my $semaphore = Thread::Semaphore->new();
my $GlobalVariable :shared = 0;
$thr1 = threads->create(\&sample_sub, 1);
$thr2 = threads->create(\&sample_sub, 2);
$thr3 = threads->create(\&sample_sub, 3);
sub sample_sub {
my $SubNumber = shift(@_);
my $TryCount = 10;
my $LocalCopy;
while ($TryCount--) {
$LocalCopy = $GlobalVariable;
print("$TryCount tries left for sub $SubNumber "
."(\$GlobalVariable is $GlobalVariable)\n");
$GlobalVariable = $LocalCopy;
The three invocations of the subroutine all operate in sync. The semaphore, though, makes sure that only one thread is accessing the global variable at once.
By default, semaphores behave like locks, letting only one thread
down() them at a time. However, there are other uses for semaphores.
Each semaphore has a counter attached to it. By default, semaphores are created with the counter set to one,
down() decrements the counter by one, and
up() increments by one. However, we can override any or all of these defaults simply by passing in different values:
use threads;
use Thread::Semaphore;
my $semaphore = Thread::Semaphore->new(5);
# Creates a semaphore with the counter set to five
my $thr1 = threads->create(\&sub1);
my $thr2 = threads->create(\&sub1);
sub sub1 {
$semaphore->down(5); # Decrements the counter by five
# Do stuff here
$semaphore->up(5); # Increment the counter by five
down() attempts to decrement the counter below zero, it blocks until the counter is large enough. Note that while a semaphore can be created with a starting count of zero, any
up() or
down() always changes the counter by at least one, and so
$semaphore->down(0) is the same as
The question, of course, is why would you do something like this? Why create a semaphore with a starting count that's not one, or why decrement or increment it by more than one? The answer is resource availability. Many resources that you want to manage access for can be safely used by more than one thread at once.
For example, let's take a GUI driven program. It has a semaphore that it uses to synchronize access to the display, so only one thread is ever drawing at once. Handy, but of course you don't want any thread to start drawing until things are properly set up. In this case, you can create a semaphore with a counter set to zero, and up it when things are ready for drawing.
Semaphores with counters greater than one are also useful for establishing quotas. Say, for example, that you have a number of threads that can do I/O at once. You don't want all the threads reading or writing at once though, since that can potentially swamp your I/O channels, or deplete your process's quota of filehandles. You can use a semaphore initialized to the number of concurrent I/O requests (or open files) that you want at any one time, and have your threads quietly block and unblock themselves.
Larger increments or decrements are handy in those cases where a thread needs to check out or return a number of resources at once.
The functions
cond_wait() and
cond_signal() can be used in conjunction with locks to notify co-operating threads that a resource has become available. They are very similar in use to the functions found in
pthreads. However for most purposes, queues are simpler to use and more intuitive. See threads::shared for more details.
There are times when you may find it useful to have a thread explicitly give up the CPU to another thread. You may be doing something processor-intensive and want to make sure that the user-interface thread gets called frequently. Regardless, there are times that you might want a thread to give up the processor.
Perl's threading package provides the
yield() function that does this.
yield() is pretty straightforward, and works like this:
use threads;
sub loop {
my $thread = shift;
my $foo = 50;
while($foo--) { print("In thread $thread\n"); }
$foo = 50;
while($foo--) { print("In thread $thread\n"); }
my $thr1 = threads->create(\&loop, 'first');
my $thr2 = threads->create(\&loop, 'second');
my $thr3 = threads->create(\&loop, 'third');
It is important to remember that
yield() is only a hint to give up the CPU, it depends on your hardware, OS and threading libraries what actually happens. On many operating systems, yield() is a no-op. Therefore it is important to note that one should not build the scheduling of the threads around
yield() calls. It might work on your platform but it won't work on another platform.
We've covered the workhorse parts of Perl's threading package, and with these tools you should be well on your way to writing threaded code and packages. There are a few useful little pieces that didn't really fit in anyplace else.
threads->self() class method provides your program with a way to get an object representing the thread it's currently in. You can use this object in the same way as the ones returned from thread creation.
tid() is a thread object method that returns the thread ID of the thread the object represents. Thread IDs are integers, with the main thread in a program being 0. Currently Perl assigns a unique TID to every thread ever created in your program, assigning the first thread to be created a TID of 1, and increasing the TID by 1 for each new thread that's created. When used as a class method,
threads->tid() can be used by a thread to get its own TID.
equal() method takes two thread objects and returns true if the objects represent the same thread, and false if they don't.
Thread objects also have an overloaded
== comparison so that you can do comparison on them as you would with normal objects.
threads->list() returns a list of thread objects, one for each thread that's currently running and not detached. Handy for a number of things, including cleaning up at the end of your program (from the main Perl thread, of course):
# Loop through all the threads
foreach my $thr (threads->list()) {
If some threads have not finished running when the main Perl thread ends, Perl will warn you about it and die, since it is impossible for Perl to clean up itself while other threads are running.
NOTE: The main Perl thread (thread 0) is in a detached state, and so does not appear in the list returned by
Confused yet? It's time for an example program to show some of the things we've covered. This program finds prime numbers using threads.
1 #!/usr/bin/perl
2 # prime-pthread, courtesy of Tom Christiansen
4 use v5.36;
6 use threads;
7 use Thread::Queue;
9 sub check_num ($upstream, $cur_prime) {
10 my $kid;
11 my $downstream = Thread::Queue->new();
12 while (my $num = $upstream->dequeue()) {
13 next unless ($num % $cur_prime);
14 if ($kid) {
15 $downstream->enqueue($num);
16 } else {
17 print("Found prime: $num\n");
18 $kid = threads->create(\&check_num, $downstream, $num);
19 if (! $kid) {
20 warn("Sorry. Ran out of threads.\n");
21 last;
22 }
23 }
24 }
25 if ($kid) {
26 $downstream->enqueue(undef);
27 $kid->join();
28 }
29 }
31 my $stream = Thread::Queue->new(3..1000, undef);
32 check_num($stream, 2);
This program uses the pipeline model to generate prime numbers. Each thread in the pipeline has an input queue that feeds numbers to be checked, a prime number that it's responsible for, and an output queue into which it funnels numbers that have failed the check. If the thread has a number that's failed its check and there's no child thread, then the thread must have found a new prime number. In that case, a new child thread is created for that prime and stuck on the end of the pipeline.
This probably sounds a bit more confusing than it really is, so let's go through this program piece by piece and see what it does. (For those of you who might be trying to remember exactly what a prime number is, it's a number that's only evenly divisible by itself and 1.)
The bulk of the work is done by the
check_num() subroutine, which takes a reference to its input queue and a prime number that it's responsible for. We create a new queue (line 11) and reserve a scalar for the thread that we're likely to create later (line 10).
The while loop from line 12 to line 24 grabs a scalar off the input queue and checks against the prime this thread is responsible for. Line 13 checks to see if there's a remainder when we divide the number to be checked by our prime. If there is one, the number must not be evenly divisible by our prime, so we need to either pass it on to the next thread if we've created one (line 15) or create a new thread if we haven't.
The new thread creation is line 18. We pass on to it a reference to the queue we've created, and the prime number we've found. In lines 19 through 22, we check to make sure that our new thread got created, and if not, we stop checking any remaining numbers in the queue.
Finally, once the loop terminates (because we got a 0 or
undef in the queue, which serves as a note to terminate), we pass on the notice to our child, and wait for it to exit if we've created a child (lines 25 and 28).
Meanwhile, back in the main thread, we first create a queue (line 31) and queue up all the numbers from 3 to 1000 for checking, plus a termination notice. Then all we have to do to get the ball rolling is pass the queue and the first prime to the
check_num() subroutine (line 32).
That's how it works. It's pretty simple; as with many Perl programs, the explanation is much longer than the program.
Some background on thread implementations from the operating system viewpoint. There are three basic categories of threads: user-mode threads, kernel threads, and multiprocessor kernel threads.
User-mode threads are threads that live entirely within a program and its libraries. In this model, the OS knows nothing about threads. As far as it's concerned, your process is just a process.
This is the easiest way to implement threads, and the way most OSes start. The big disadvantage is that, since the OS knows nothing about threads, if one thread blocks they all do. Typical blocking activities include most system calls, most I/O, and things like
Kernel threads are the next step in thread evolution. The OS knows about kernel threads, and makes allowances for them. The main difference between a kernel thread and a user-mode thread is blocking. With kernel threads, things that block a single thread don't block other threads. This is not the case with user-mode threads, where the kernel blocks at the process level and not the thread level.
This is a big step forward, and can give a threaded program quite a performance boost over non-threaded programs. Threads that block performing I/O, for example, won't block threads that are doing other things. Each process still has only one thread running at once, though, regardless of how many CPUs a system might have.
Since kernel threading can interrupt a thread at any time, they will uncover some of the implicit locking assumptions you may make in your program. For example, something as simple as
$x = $x + 2 can behave unpredictably with kernel threads if
$x is visible to other threads, as another thread may have changed
$x between the time it was fetched on the right hand side and the time the new value is stored.
Multiprocessor kernel threads are the final step in thread support. With multiprocessor kernel threads on a machine with multiple CPUs, the OS may schedule two or more threads to run simultaneously on different CPUs.
This can give a serious performance boost to your threaded program, since more than one thread will be executing at the same time. As a tradeoff, though, any of those nagging synchronization issues that might not have shown with basic kernel threads will appear with a vengeance.
In addition to the different levels of OS involvement in threads, different OSes (and different thread implementations for a particular OS) allocate CPU cycles to threads in different ways.
Cooperative multitasking systems have running threads give up control if one of two things happen. If a thread calls a yield function, it gives up control. It also gives up control if the thread does something that would cause it to block, such as perform I/O. In a cooperative multitasking implementation, one thread can starve all the others for CPU time if it so chooses.
Preemptive multitasking systems interrupt threads at regular intervals while the system decides which thread should run next. In a preemptive multitasking system, one thread usually won't monopolize the CPU.
On some systems, there can be cooperative and preemptive threads running simultaneously. (Threads running with realtime priorities often behave cooperatively, for example, while threads running at normal priorities behave preemptively.)
Most modern operating systems support preemptive multitasking nowadays.
The main thing to bear in mind when comparing Perl's ithreads to other threading models is the fact that for each new thread created, a complete copy of all the variables and data of the parent thread has to be taken. Thus, thread creation can be quite expensive, both in terms of memory usage and time spent in creation. The ideal way to reduce these costs is to have a relatively short number of long-lived threads, all created fairly early on (before the base thread has accumulated too much data). Of course, this may not always be possible, so compromises have to be made. However, after a thread has been created, its performance and extra memory usage should be little different than ordinary code.
Also note that under the current implementation, shared variables use a little more memory and are a little slower than ordinary variables.
Note that while threads themselves are separate execution threads and Perl data is thread-private unless explicitly shared, the threads can affect process-scope state, affecting all the threads.
The most common example of this is changing the current working directory using
chdir(). One thread calls
chdir(), and the working directory of all the threads changes.
Even more drastic example of a process-scope change is
chroot(): the root directory of all the threads changes, and no thread can undo it (as opposed to
Further examples of process-scope changes include
umask() and changing uids and gids.
Thinking of mixing
fork() and threads? Please lie down and wait until the feeling passes. Be aware that the semantics of
fork() vary between platforms. For example, some Unix systems copy all the current threads into the child process, while others only copy the thread that called
fork(). You have been warned!
Similarly, mixing signals and threads may be problematic. Implementations are platform-dependent, and even the POSIX semantics may not be what you expect (and Perl doesn't even give you the full POSIX API). For example, there is no way to guarantee that a signal sent to a multi-threaded Perl application will get intercepted by any particular thread. (However, a recently added feature does provide the capability to send signals between threads. See "THREAD SIGNALLING" in threads for more details.)
Whether various library calls are thread-safe is outside the control of Perl. Calls often suffering from not being thread-safe include:
gmtime(), functions fetching user, group and network information (such as
getnetent() and so on),
rand(), and
srand(). In general, calls that depend on some global external state.
If the system Perl is compiled in has thread-safe variants of such calls, they will be used. Beyond that, Perl is at the mercy of the thread-safety or -unsafety of the calls. Please consult your C library call documentation.
On some platforms the thread-safe library interfaces may fail if the result buffer is too small (for example the user group databases may be rather large, and the reentrant interfaces may have to carry around a full snapshot of those databases). Perl will start with a small buffer, but keep retrying and growing the result buffer until the result fits. If this limitless growing sounds bad for security or memory consumption reasons you can recompile Perl with
PERL_REENTRANT_MAXSIZE defined to the maximum number of bytes you will allow.
A complete thread tutorial could fill a book (and has, many times), but with what we've covered in this introduction, you should be well on your way to becoming a threaded Perl expert.
Annotated POD for threads: https://web.archive.org/web/20171028020148/http://annocpan.org/?mode=search&field=Module&name=threads
Latest version of threads on CPAN: https://metacpan.org/pod/threads
Annotated POD for threads::shared: https://web.archive.org/web/20171028020148/http://annocpan.org/?mode=search&field=Module&name=threads%3A%3Ashared
Latest version of threads::shared on CPAN: https://metacpan.org/pod/threads::shared
Perl threads mailing list: https://lists.perl.org/list/ithreads.html
Here's a short bibliography courtesy of Jürgen Christoffel:
Birrell, Andrew D. An Introduction to Programming with Threads. Digital Equipment Corporation, 1989, DEC-SRC Research Report #35 online as https://www.hpl.hp.com/techreports/Compaq-DEC/SRC-RR-35.pdf (highly recommended)
Robbins, Kay. A., and Steven Robbins. Practical Unix Programming: A Guide to Concurrency, Communication, and Multithreading. Prentice-Hall, 1996.
Lewis, Bill, and Daniel J. Berg. Multithreaded Programming with Pthreads. Prentice Hall, 1997, ISBN 0-13-443698-9 (a well-written introduction to threads).
Nelson, Greg (editor). Systems Programming with Modula-3. Prentice Hall, 1991, ISBN 0-13-590464-1.
Nichols, Bradford, Dick Buttlar, and Jacqueline Proulx Farrell. Pthreads Programming. O'Reilly & Associates, 1996, ISBN 156592-115-1 (covers POSIX threads).
Boykin, Joseph, David Kirschen, Alan Langerman, and Susan LoVerso. Programming under Mach. Addison-Wesley, 1994, ISBN 0-201-52739-1.
Tanenbaum, Andrew S. Distributed Operating Systems. Prentice Hall, 1995, ISBN 0-13-219908-4 (great textbook).
Silberschatz, Abraham, and Peter B. Galvin. Operating System Concepts, 4th ed. Addison-Wesley, 1995, ISBN 0-201-59292-4
Arnold, Ken and James Gosling. The Java Programming Language, 2nd ed. Addison-Wesley, 1998, ISBN 0-201-31006-6.
comp.programming.threads FAQ, http://www.serpentine.com/~bos/threads-faq/
Le Sergent, T. and B. Berthomieu. "Incremental MultiThreaded Garbage Collection on Virtually Shared Memory Architectures" in Memory Management: Proc. of the International Workshop IWMM 92, St. Malo, France, September 1992, Yves Bekkers and Jacques Cohen, eds. Springer, 1992, ISBN 3540-55940-X (real-life thread applications).
Artur Bergman, "Where Wizards Fear To Tread", June 11, 2002, http://www.perl.com/pub/a/2002/06/11/threads.html
Thanks (in no particular order) to Chaim Frenkel, Steve Fink, Gurusamy Sarathy, Ilya Zakharevich, Benjamin Sugars, Jürgen Christoffel, Joshua Pritikin, and Alan Burlison, for their help in reality-checking and polishing this article. Big thanks to Tom Christiansen for his rewrite of the prime number generator.
Dan Sugalski <firstname.lastname@example.com>
Slightly modified by Arthur Bergman to fit the new thread model/module.
Reworked slightly by Jörg Walter <email@example.com> to be more concise about thread-safety of Perl code.
Rearranged slightly by Elizabeth Mattijsen <firstname.lastname@example.com> to put less emphasis on yield().
The original version of this article originally appeared in The Perl Journal #10, and is copyright 1998 The Perl Journal. It appears courtesy of Jon Orwant and The Perl Journal. This document may be distributed under the same terms as Perl itself.


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Eiffel ROC CMS library is build with [EWF](http://eiffelwebframework.github.io/EWF/) and inspired by [Drupal](https://www.drupal.org/). The goal of the library is to provide the following features. - content type - user management - node management - module design - theme - API - ...
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