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From: | "Andrew T. Schnable" <schnable AT enteract DOT com> |
To: | <cygwin AT cygwin DOT com> |
Subject: | sem_trywait returns EAGAIN (rather than returning -1 and setting errno) |
Date: | Mon, 25 Feb 2002 21:31:41 -0500 |
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Greetings, I was doing some pthreads/semaphore work and I tracked down a problem in my code to a bug in sem_trywait. Posix sem_trywait is defined as returning -1 and setting errno to EAGAIN if the semaphore would have blocked. The cygwin implementation returns EAGAIN an leaves errno unchanged. Has anyone else encountered this problem and provided a fix? Andy schnable AT enteract DOT com PS. The problem seems to be in thread.cc (semaphore::TryWait) - I don't see much stderr setting anywhere in this file - is this verboten - or just overlooked? int semaphore::TryWait () { /*FIXME: signals should be able to interrupt semaphores... *We probably need WaitForMultipleObjects here. */ if (WaitForSingleObject (win32_obj_id, 0) == WAIT_TIMEOUT) return EAGAIN; currentvalue--; return 0; } -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
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