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Fix kqueue timeout for 0-valued timespec (#15940)

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Timeout with 0-valued timespec means try to get an event, but return
immediately if there is none. Apparently timespec can have other
members, so best to 0 it out in that case.
This commit is contained in:
Luke Gruber 2026-01-23 11:54:44 -05:00 committed by GitHub
parent 48848e8da4
commit e7e9303236
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Notes: git 2026-01-23 16:55:13 +00:00 
Merged-By: luke-gru <luke.gru@gmail.com>
1 changed files with 7 additions and 1 deletions
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8
thread_pthread_mn.c
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@ -617,11 +617,17 @@ kqueue_wait(rb_vm_t *vm)
struct timespec *timeout = NULL;
int timeout_ms = timer_thread_set_timeout(vm);
if (timeout_ms >= 0) {
if (timeout_ms > 0) {
calculated_timeout.tv_sec = timeout_ms / 1000;
calculated_timeout.tv_nsec = (timeout_ms % 1000) * 1000000;
timeout = &calculated_timeout;
}
else if (timeout_ms == 0) {
// Relying on the absence of other members of struct timespec is not strictly portable,
// and kevent needs a 0-valued timespec to mean immediate timeout.
memset(&calculated_timeout, 0, sizeof(struct timespec));
timeout = &calculated_timeout;
}
return kevent(timer_th.event_fd, NULL, 0, timer_th.finished_events, KQUEUE_EVENTS_MAX, timeout);
}