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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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2
third_party/openmp/kmp_lock.cpp vendored
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@ -380,7 +380,7 @@ __kmp_acquire_futex_lock_timed_template(kmp_futex_lock_t *lck, kmp_int32 gtid) {
long rc;
#ifdef __COSMOPOLITAN__
if ((rc = nsync_futex_wait_((int *)&(lck->lk.poll), poll_val, false, NULL)) != 0) {
if ((rc = nsync_futex_wait_((int *)&(lck->lk.poll), poll_val, false, 0, NULL)) != 0) {
#else
if ((rc = syscall(__NR_futex, (int *)&(lck->lk.poll), FUTEX_WAIT, poll_val, NULL,
NULL, 0)) != 0) {