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handle pending cancellation when enabling async cancellation

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this is not strictly required by the standard, but without it, there
is a race condition where cancellation arriving just before async
cancellation is enabled might not be acted upon. it is impossible for
a conforming application to work around this race condition since
calling pthread_testcancel after setting async cancellation mode is
not allowed (pthread_testcancel is not specified to be
async-cancel-safe). thus the implementation should be responsible for
eliminating the race, from a quality-of-implementation standpoint.
This commit is contained in:
Rich Felker
2011-09-04 21:37:07 -04:00
parent 22e4542348
commit a7778dae22
1 changed files with 1 additions and 0 deletions
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src/thread/pthread_setcanceltype.c
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@ -6,5 +6,6 @@ int pthread_setcanceltype(int new, int *old)
if (new > 1U) return EINVAL; if (new > 1U) return EINVAL;
if (old) *old = self->cancelasync; if (old) *old = self->cancelasync;
self->cancelasync = new; self->cancelasync = new;
if (new) pthread_testcancel();
return 0; return 0;
} }