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Use *NSYNC for POSIX threads locking APIs

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Condition variables, barriers, and r/w locks now work very well.
This commit is contained in:
Justine Tunney 2022-09-11 11:02:07 -07:00
parent 3de35e196c
commit b5cb71ab84
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GPG key ID: BE714B4575D6E328
197 changed files with 3734 additions and 3817 deletions
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84
third_party/nsync/mu_semaphore_win32.c vendored Normal file
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/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:8;tab-width:8;coding:utf-8 -*-│
│vi: set et ft=c ts=8 tw=8 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2016 Google Inc. │
│ │
│ Licensed under the Apache License, Version 2.0 (the "License"); │
│ you may not use this file except in compliance with the License. │
│ You may obtain a copy of the License at │
│ │
│ http://www.apache.org/licenses/LICENSE-2.0 │
│ │
│ Unless required by applicable law or agreed to in writing, software │
│ distributed under the License is distributed on an "AS IS" BASIS, │
│ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. │
│ See the License for the specific language governing permissions and │
│ limitations under the License. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/errno.h"
#include "libc/nt/enum/wait.h"
#include "libc/nt/synchronization.h"
#include "libc/runtime/runtime.h"
#include "third_party/nsync/mu_semaphore.h"
#include "third_party/nsync/mu_semaphore.internal.h"
#include "third_party/nsync/time.h"
asm(".ident\t\"\\n\\n\
*NSYNC (Apache 2.0)\\n\
Copyright 2016 Google, Inc.\\n\
https://github.com/google/nsync\"");
// clang-format off
/* Initialize *s; the initial value is 0. */
void nsync_mu_semaphore_init_win32 (nsync_semaphore *s) {
int64_t *h = (int64_t *) s;
*h = CreateSemaphore(NULL, 0, 1, NULL);
if (!*h) notpossible;
}
/* Wait until the count of *s exceeds 0, and decrement it. */
void nsync_mu_semaphore_p_win32 (nsync_semaphore *s) {
int64_t *h = (int64_t *) s;
WaitForSingleObject(*h, -1u);
}
/* Wait until one of:
the count of *s is non-zero, in which case decrement *s and return 0;
or abs_deadline expires, in which case return ETIMEDOUT. */
int nsync_mu_semaphore_p_with_deadline_win32 (nsync_semaphore *s, nsync_time abs_deadline) {
int64_t *h = (int64_t *) s;
int result;
if (nsync_time_cmp (abs_deadline, nsync_time_no_deadline) == 0) {
result = WaitForSingleObject(*h, -1u);
} else {
nsync_time now;
now = nsync_time_now ();
do {
if (nsync_time_cmp (abs_deadline, now) <= 0) {
result = WaitForSingleObject (*h, 0);
} else {
nsync_time delay;
delay = nsync_time_sub (abs_deadline, now);
if (NSYNC_TIME_SEC (delay) > 1000*1000) {
result = WaitForSingleObject (*h, 1000*1000);
} else {
result = WaitForSingleObject (*h,
(unsigned) (NSYNC_TIME_SEC (delay) * 1000 +
(NSYNC_TIME_NSEC (delay) + 999999) / (1000 * 1000)));
}
}
if (result == kNtWaitTimeout) {
now = nsync_time_now ();
}
} while (result == kNtWaitTimeout && /* Windows generates early wakeups. */
nsync_time_cmp (abs_deadline, now) > 0);
}
return (result == kNtWaitTimeout ? ETIMEDOUT : 0);
}
/* Ensure that the count of *s is at least 1. */
void nsync_mu_semaphore_v_win32 (nsync_semaphore *s) {
int64_t *h = (int64_t *) s;
ReleaseSemaphore(*h, 1, NULL);
}