PTHREAD_SELF(3) Linux Programmer's Manual PTHREAD_SELF(3)

pthread_self - obtain ID of the calling thread

#include <pthread.h>
pthread_t pthread_self(void);
Compile and link with -pthread.

The pthread_self() function returns the ID of the calling thread. This is the same value that is returned in *thread in the pthread_create(3) call that created this thread.

This function always succeeds, returning the calling thread's ID.

This function always succeeds.

Interface Attribute Value
pthread_self () Thread safety MT-Safe

POSIX.1-2001, POSIX.1-2008.

POSIX.1 allows an implementation wide freedom in choosing the type used to represent a thread ID; for example, representation using either an arithmetic type or a structure is permitted. Therefore, variables of type pthread_t can't portably be compared using the C equality operator (==); use pthread_equal(3) instead.

Thread identifiers should be considered opaque: any attempt to use a thread ID other than in pthreads calls is nonportable and can lead to unspecified results.

Thread IDs are guaranteed to be unique only within a process. A thread ID may be reused after a terminated thread has been joined, or a detached thread has terminated.

The thread ID returned by pthread_self() is not the same thing as the kernel thread ID returned by a call to gettid(2).

pthread_create(3), pthread_equal(3), pthreads(7)

2021-03-22 Linux