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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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4
third_party/nsync/testing/cv_wait_example_test.c vendored
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@ -24,6 +24,7 @@
#include "third_party/nsync/testing/closure.h"
#include "third_party/nsync/testing/smprintf.h"
#include "third_party/nsync/testing/testing.h"
#include "libc/sysv/consts/clock.h"
#include "third_party/nsync/testing/time_extra.h"
/* Example use of CV.wait(): A priority queue of strings whose
@ -74,7 +75,8 @@ static const char *string_priority_queue_cv_remove_with_deadline (string_priorit
const char *s = NULL;
nsync_mu_lock (&q->mu);
while (A_LEN (&q->heap) == 0 &&
nsync_cv_wait_with_deadline (&q->non_empty, &q->mu, abs_deadline, NULL) == 0) {
nsync_cv_wait_with_deadline (&q->non_empty, &q->mu, CLOCK_REALTIME,
abs_deadline, NULL) == 0) {
}
alen = A_LEN (&q->heap);
if (alen != 0) {