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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
libc/intrin/sys_umtx_timedwait_uint.c
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@ -23,7 +23,7 @@
int sys_umtx_timedwait_uint_cp(atomic_int *, int, int, size_t,
struct _umtx_time *) asm("sys_futex_cp");
int sys_umtx_timedwait_uint(atomic_int *p, int expect, bool pshare,
int sys_umtx_timedwait_uint(atomic_int *p, int expect, bool pshare, int clock,
const struct timespec *abstime) {
int op;
size_t size;
@ -32,7 +32,7 @@ int sys_umtx_timedwait_uint(atomic_int *p, int expect, bool pshare,
tm_p = 0;
size = 0;
} else {
timo._clockid = CLOCK_REALTIME;
timo._clockid = clock;
timo._flags = UMTX_ABSTIME;
timo._timeout = *abstime;
tm_p = &timo;