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ensure pthread-internal signals are unblocked before threads are used 

if the process started with these signals blocked, cancellation could
fail or setxid could deadlock. there is no way to globally unblock
them after threads have been created. by unblocking them in the
pthread_self initialization for the main thread, we ensure that
they're unblocked before any other threads are created and also
outside of any signal handler context (sigaction initialized
pthread_self), which is important so that return from a signal handler
won't re-block them.
This commit is contained in:
Rich Felker 2012-05-25 22:34:09 -04:00
parent 8b4c232efe
commit 8cce15af83
1 changed files with 1 additions and 0 deletions
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src/thread/pthread_self.c
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@ -8,6 +8,7 @@ weak_alias(dummy, __pthread_tsd_main);
static int init_main_thread() static int init_main_thread()
{ {
__syscall(SYS_rt_sigprocmask, SIG_UNBLOCK, SIGPT_SET, 0, 8);
if (__set_thread_area(&main_thread) < 0) return -1; if (__set_thread_area(&main_thread) < 0) return -1;
main_thread.canceldisable = libc.canceldisable; main_thread.canceldisable = libc.canceldisable;
main_thread.tsd = (void **)__pthread_tsd_main; main_thread.tsd = (void **)__pthread_tsd_main;