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fix timer handling in subprocess

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This bug was introduced with the rktio conversion.
This commit is contained in:
Matthew Flatt 2017-06-20 11:57:43 -06:00
parent a5b28c453a
commit a7ab538403
1 changed files with 11 additions and 11 deletions
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20
racket/src/racket/src/port.c
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@ -6578,12 +6578,17 @@ static void kickoff_itimer(intptr_t usec)
}
static void block_timer_signals(int block)
/* Doesn't actually block the signal, because we don't want
a new subprocess to start with the signal blocked,
but turns off the timer and makes sure that no signal
is pending. */
{
static intptr_t saved_usec;
if (block) {
struct itimerval t, old;
sigset_t sigs;
if (block) {
t.it_value.tv_sec = 0;
t.it_value.tv_usec = 0;
t.it_interval.tv_sec = 0;
@ -6592,16 +6597,9 @@ static void block_timer_signals(int block)
setitimer(ITIMER_PROF, &t, &old);
saved_usec = old.it_value.tv_usec;
} else {
kickoff_itimer(saved_usec);
}
sigemptyset(&sigs);
sigaddset(&sigs, ITIMER_PROF);
sigprocmask(block ? SIG_BLOCK : SIG_UNBLOCK, &sigs, NULL);
if (block) {
/* Clear already-queued PROF signal, if any: */
/* Clear already-queued PROF signal, if any
--- unlikely, but possible */
sigemptyset(&sigs);
while (!sigpending(&sigs)) {
if (sigismember(&sigs, SIGPROF)) {
@ -6612,6 +6610,8 @@ static void block_timer_signals(int block)
} else
break;
}
} else {
kickoff_itimer(saved_usec);
}
}