/*
 * Copyright 2014 Real Logic Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package uk.co.real_logic.aeron;

/**
 * Signal a waiting thread that an event has occurred which it has been waiting on.
 */
class Signal
{
    private boolean signalRaised;

    public Signal()
    {
        signalRaised = false;
    }

    public synchronized void signal()
    {
        if (signalRaised)
        {
            throw new IllegalStateException("Attempting to signal when signal has already been raised");
        }

        signalRaised = true;
        this.notify();
    }

    public synchronized void await(final long awaitTimeout)
    {
        if (signalRaised)
        {
            signalRaised = false;
            return;
        }

        try
        {
            wait(awaitTimeout);
        }
        catch (final InterruptedException ex)
        {
            throw new RuntimeException(ex);
        }
        finally
        {
            signalRaised = false;
        }
    }
}

@@ -1155,33 +1155,19 @@
         
-if (signalRaised)
+try
 %0A       
@@ -1173,32 +1173,40 @@
   %7B%0A            
+while (!
 signalRaised = f
@@ -1197,33 +1197,25 @@
 signalRaised
- = false;
+)
 %0A           
@@ -1219,49 +1219,14 @@
     
-return;%0A        %7D%0A%0A        try%0A        %7B%0A
+%7B%0A    
     
@@ -1253,16 +1253,30 @@
 meout);%0A
+            %7D%0A
         

Handle spurious wakeup case in Signal.await(long)