30 lines
1.2 KiB
Plaintext
30 lines
1.2 KiB
Plaintext
*** ../pwlib/src/ptlib/unix/tlibthrd.cxx.orig Thu Nov 16 11:14:48 2000
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--- ../pwlib/src/ptlib/unix/tlibthrd.cxx Thu Nov 16 11:15:21 2000
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*************** void PThread::PX_NewThread(BOOL startSus
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*** 386,391 ****
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--- 386,409 ----
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// pthread_attr_t threadAttr;
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// pthread_attr_init(&threadAttr);
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PAssertOS(pthread_create(&PX_threadId, NULL, PX_ThreadStart, this) == 0);
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+
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+ #if defined(P_FREEBSD)
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+ // There is a potential race condition here which shows up with FreeBSD 4.2
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+ // and later, but really applies to all pthread libraries.
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+ // If a thread is started in suspend mode, we need to make sure
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+ // the thread (PX_ThreadStart) has had a chance to execute and block on the
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+ // sigwait() (blocking on the Resume Signal) before this function returns.
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+ // Otherwise the main program may issue a Resume Signal on the thread
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+ // by calling PThread::Resume() before the thread is ready for it.
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+ // If that happens the program will abort with an unhandled signal error.
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+ // A workaround (not 100% guaranteed) is to yield here, which gives
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+ // the newly created thread (PX_ThreadStart) a chance to execute.
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+
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+ if (startSuspended) {
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+ sched_yield();
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+ }
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+ #endif
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+
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}
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