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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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55 changed files with 449 additions and 155 deletions
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2
third_party/nsync/waiter.h vendored
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@ -102,7 +102,7 @@ struct nsync_waitable_s {
mu/lock/unlock are used to acquire and release the relevant locks
whan waiting on condition variables. */
int nsync_wait_n(void *mu, void (*lock)(void *), void (*unlock)(void *),
nsync_time abs_deadline, int count,
int clock, nsync_time abs_deadline, int count,
struct nsync_waitable_s *waitable[]);
/* A "struct nsync_waitable_s" implementation must implement these