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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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5
third_party/nsync/testing/pingpong_test.c vendored
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@ -107,6 +107,7 @@ static void mutex_cv_ping_pong (ping_pong *pp, int parity) {
nsync_cv_wait_with_deadline_generic (&pp->cv[parity], &pp->mutex,
&void_pthread_mutex_lock,
&void_pthread_mutex_unlock,
CLOCK_REALTIME,
nsync_time_no_deadline, NULL);
}
pp->i++;
@ -163,7 +164,8 @@ static void mu_cv_unexpired_deadline_ping_pong (ping_pong *pp, int parity) {
while (pp->i < pp->limit) {
while ((pp->i & 1) == parity) {
nsync_cv_wait_with_deadline (&pp->cv[parity], &pp->mu,
deadline_in1hour, NULL);
CLOCK_REALTIME, deadline_in1hour,
NULL);
}
pp->i++;
nsync_cv_signal (&pp->cv[1 - parity]);
@ -318,6 +320,7 @@ static void rw_mutex_cv_ping_pong (ping_pong *pp, int parity) {
nsync_cv_wait_with_deadline_generic (&pp->cv[parity], &pp->rwmutex,
&void_pthread_rwlock_wrlock,
&void_pthread_rwlock_unlock,
CLOCK_REALTIME,
nsync_time_no_deadline, NULL);
}
pp->i++;