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in synccall, ignore the signal before any threads' signal handlers return 

this protects against deadlock from spurious signals (e.g. sent by
another process) arriving after the controlling thread releases the
other threads from the sync operation.
This commit is contained in:
Rich Felker 2013-09-02 15:16:36 -04:00
parent a731e4103b
commit 3c0501d28c
1 changed files with 4 additions and 4 deletions
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8
src/thread/synccall.c
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@ -71,6 +71,10 @@ void __synccall(void (*func)(void *), void *ctx)
sigqueue(self->pid, SIGSYNCCALL, (union sigval){0});
while (sem_wait(&chaindone));
sa.sa_flags = 0;
sa.sa_handler = SIG_IGN;
__libc_sigaction(SIGSYNCCALL, &sa, 0);
for (cur=head; cur; cur=cur->next) {
sem_post(&cur->sem);
while (sem_wait(&cur->sem2));
@ -82,10 +86,6 @@ void __synccall(void (*func)(void *), void *ctx)
sem_post(&cur->sem);
}
sa.sa_flags = 0;
sa.sa_handler = SIG_IGN;
__libc_sigaction(SIGSYNCCALL, &sa, 0);
__syscall(SYS_rt_sigprocmask, SIG_SETMASK,
&oldmask, 0, _NSIG/8);