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Introduce pthread_condattr_setclock()

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This is one of the few POSIX APIs that was missing. It lets you choose a
monotonic clock for your condition variables. This might improve perf on
some platforms. It might also grant more flexibility with NTP configs. I
know Qt is one project that believes it needs this. To introduce this, I
needed to change some the *NSYNC APIs, to support passing a clock param.
There's also new benchmarks, demonstrating Cosmopolitan's supremacy over
many libc implementations when it comes to mutex performance. Cygwin has
an alarmingly bad pthread_mutex_t implementation. It is so bad that they
would have been significantly better off if they'd used naive spinlocks.
This commit is contained in:
Justine Tunney 2024-09-02 23:37:50 -07:00
parent 79516bf08e
commit 3c61a541bd
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GPG key ID: BE714B4575D6E328
55 changed files with 449 additions and 155 deletions
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8
third_party/nsync/mu_semaphore.c vendored
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@ -54,15 +54,15 @@ errno_t nsync_mu_semaphore_p (nsync_semaphore *s) {
while additionally supporting a time parameter specifying at what point
in the future ETIMEDOUT should be returned, if neither cancelation, or
semaphore release happens. */
errno_t nsync_mu_semaphore_p_with_deadline (nsync_semaphore *s, nsync_time abs_deadline) {
errno_t nsync_mu_semaphore_p_with_deadline (nsync_semaphore *s, int clock, nsync_time abs_deadline) {
errno_t err;
BEGIN_CANCELATION_POINT;
if (NSYNC_USE_GRAND_CENTRAL && IsXnuSilicon ()) {
err = nsync_mu_semaphore_p_with_deadline_gcd (s, abs_deadline);
err = nsync_mu_semaphore_p_with_deadline_gcd (s, clock, abs_deadline);
} else if (IsNetbsd ()) {
err = nsync_mu_semaphore_p_with_deadline_sem (s, abs_deadline);
err = nsync_mu_semaphore_p_with_deadline_sem (s, clock, abs_deadline);
} else {
err = nsync_mu_semaphore_p_with_deadline_futex (s, abs_deadline);
err = nsync_mu_semaphore_p_with_deadline_futex (s, clock, abs_deadline);
}
END_CANCELATION_POINT;
return err;