mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
3c61a541bd
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.
47 lines
2.6 KiB
C
47 lines
2.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2022 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/atomic.h"
|
|
#include "libc/sysv/consts/clock.h"
|
|
#include "libc/thread/freebsd.internal.h"
|
|
|
|
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 clock,
|
|
const struct timespec *abstime) {
|
|
int op;
|
|
size_t size;
|
|
struct _umtx_time *tm_p, timo;
|
|
if (!abstime) {
|
|
tm_p = 0;
|
|
size = 0;
|
|
} else {
|
|
timo._clockid = clock;
|
|
timo._flags = UMTX_ABSTIME;
|
|
timo._timeout = *abstime;
|
|
tm_p = &timo;
|
|
size = sizeof(timo);
|
|
}
|
|
if (pshare) {
|
|
op = UMTX_OP_WAIT_UINT;
|
|
} else {
|
|
op = UMTX_OP_WAIT_UINT_PRIVATE;
|
|
}
|
|
return sys_umtx_timedwait_uint_cp(p, op, expect, size, tm_p);
|
|
}
|