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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/mem/nsync_wait.c vendored
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@ -28,7 +28,7 @@
__static_yoink("nsync_notice");
int nsync_wait_n (void *mu, void (*lock) (void *), void (*unlock) (void *),
nsync_time abs_deadline,
int clock, nsync_time abs_deadline,
int count, struct nsync_waitable_s *waitable[]) {
int ready;
IGNORE_RACES_START ();
@ -77,7 +77,7 @@ int nsync_wait_n (void *mu, void (*lock) (void *), void (*unlock) (void *),
}
} while (nsync_time_cmp (min_ntime, nsync_time_zero) > 0 &&
nsync_mu_semaphore_p_with_deadline (&w->sem,
min_ntime) == 0);
clock, min_ntime) == 0);
}
/* An attempt was made above to enqueue waitable[0..i-1].