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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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3
third_party/nsync/mem/nsync_once.c vendored
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@ -22,6 +22,7 @@
#include "third_party/nsync/once.h"
#include "third_party/nsync/races.internal.h"
#include "libc/thread/thread.h"
#include "libc/sysv/consts/clock.h"
#include "third_party/nsync/wait_s.internal.h"
__static_yoink("nsync_notice");
@ -91,7 +92,7 @@ static void nsync_run_once_impl (nsync_once *once, struct once_sync_s *s,
attempts += 10;
}
deadline = nsync_time_add (nsync_time_now (), nsync_time_ms (attempts));
nsync_cv_wait_with_deadline (&s->once_cv, &s->once_mu, deadline, NULL);
nsync_cv_wait_with_deadline (&s->once_cv, &s->once_mu, CLOCK_REALTIME, deadline, NULL);
} else {
attempts = pthread_delay_np (once, attempts);
}