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POThread suspends itself and another one resumes it afterwards - sometimes second event happens first
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  1. POThread suspends itself and another one resumes it afterwards - sometimes second event happens first
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    copied!<p>I have two threads; thread 2 provides necessary data for thread 1 and can start working on another piece of data in parallel with thread 1 processing it, but won't move onto the next piece if thread 1 is slower (yes, I'm aware about "Thread 1 reads what Thread 2 writes at the same time", I have a protection in form of two buffers instead of one). The code is below:</p> <pre><code>Thread 1: while(!shouldexit) { // some code Thread1_Ready = true; SuspendThread (Thread1_Handle); } Thread 2: while(!shouldexit) { while(!Thread1_Ready) { // do nothing } // some other code ResumeThread(Thread1_Handle); } </code></pre> <p>The problem is, sometimes the whole code inside Thread 2 happens faster than <code>SuspendThread</code> happens in Thread 1. The result is that Thread 1 remains suspended until yet another cycle of Thread 2 passes. This leads to one piece of data not processed by Thread 1 (not very good, but acceptable in my application), and, which is more serious, when the Stop button triggers <code>shouldexit = true</code>, Thread 1 just stays in suspended mode indefinitely.</p> <p>Two possible solutions that I thought of wouldn't work either: 1 - put <code>Thread1_Ready = true;</code> after <code>SuspendThread(Thread1_Handle);</code> (the code <code>Thread1_Ready = true;</code> never executes, obviously) 2 - put the line <code>SuspendThread(Thread1_Handle);</code> from Thread 1 to the beginning of Thread 2, right before <code>// some other code</code>, but this will cause a delay during which Thread 1 can re-enter the main loop and it will be very unpredictable.</p> <p>Can this situation be solved differently?</p>
 

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