On 2014/03/13 04:33, Eric van Gyzen wrote:
-current:
From my understand of POSIX, sem_wait(3) should always be a cancellation
point. However, when the semaphore's count is positive and the caller
successfully decrements the count, sem_wait(3) does not call
_pthread_testcancel(), so it's not a cancellation point.
See this totally contrived test case:
http://www.vangyzen.net/FreeBSD/patches/sem_wait_cancel.c
This patch seems like an appropriate fix:
http://www.vangyzen.net/FreeBSD/patches/sem_wait_cancel.diff
It adds a call to _pthread_testcancel() in the same location as
_libc_sem_timedwait_compat() in libc/gen/sem.c.
Is this a real bug, or am I missing something?
Eric
You are right, the _pthread_testcancel() call should be added.
Thanks,
David Xu
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