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Add posix semaphores support

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There's still some bugs to work out on Windows and OpenBSD.
This commit is contained in:
Justine Tunney 2022-10-14 08:25:47 -07:00
parent f52f65b2e3
commit 8111462789
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36 changed files with 779 additions and 59 deletions
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test/libc/thread/sem_timedwait_test.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net 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/calls/calls.h"
#include "libc/calls/struct/timespec.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/kprintf.h"
#include "libc/mem/gc.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/clock.h"
#include "libc/sysv/consts/sig.h"
#include "libc/testlib/testlib.h"
#include "libc/thread/semaphore.h"
#include "libc/thread/thread.h"
void *Worker(void *arg) {
int rc;
sem_t **s = arg;
struct timespec ts;
ASSERT_SYS(0, 0, clock_gettime(CLOCK_REALTIME, &ts));
ts.tv_sec += 1;
ASSERT_SYS(0, 0, sem_post(s[0]));
ASSERT_SYS(0, 0, sem_timedwait(s[1], &ts));
return 0;
}
TEST(sem_timedwait, threads) {
int i, r, n = 4;
sem_t sm[2], *s[2] = {sm, sm + 1};
pthread_t *t = _gc(malloc(sizeof(pthread_t) * n));
ASSERT_SYS(0, 0, sem_init(s[0], 0, 0));
ASSERT_SYS(0, 0, sem_init(s[1], 0, 0));
for (i = 0; i < n; ++i) ASSERT_EQ(0, pthread_create(t + i, 0, Worker, s));
for (i = 0; i < n; ++i) ASSERT_SYS(0, 0, sem_wait(s[0]));
ASSERT_SYS(0, 0, sem_getvalue(s[0], &r));
ASSERT_EQ(0, r);
for (i = 0; i < n; ++i) ASSERT_SYS(0, 0, sem_post(s[1]));
for (i = 0; i < n; ++i) ASSERT_EQ(0, pthread_join(t[i], 0));
ASSERT_SYS(0, 0, sem_getvalue(s[1], &r));
ASSERT_EQ(0, r);
ASSERT_SYS(0, 0, sem_destroy(s[1]));
ASSERT_SYS(0, 0, sem_destroy(s[0]));
}
TEST(sem_timedwait, processes) {
if (IsOpenbsd()) return; // TODO(jart): fix me
int i, r, rc, n = 4, pshared = 1;
sem_t *sm = _mapshared(FRAMESIZE), *s[2] = {sm, sm + 1};
ASSERT_SYS(0, 0, sem_init(s[0], pshared, 0));
ASSERT_SYS(0, 0, sem_init(s[1], pshared, 0));
for (i = 0; i < n; ++i) {
ASSERT_NE(-1, (rc = fork()));
if (!rc) Worker(s), _Exit(0);
}
for (i = 0; i < n; ++i) ASSERT_SYS(0, 0, sem_wait(s[0]));
ASSERT_SYS(0, 0, sem_getvalue(s[0], &r));
ASSERT_EQ(0, r);
for (i = 0; i < n; ++i) ASSERT_SYS(0, 0, sem_post(s[1]));
for (;;) {
int ws, pid, e = errno;
if ((pid = waitpid(0, &ws, 0)) != -1) {
if (WIFSIGNALED(ws)) {
kprintf("process %d terminated with %G\n", pid, WTERMSIG(ws));
testlib_incrementfailed();
} else if (WEXITSTATUS(ws)) {
kprintf("process %d exited with %d\n", pid, WEXITSTATUS(ws));
testlib_incrementfailed();
}
} else {
ASSERT_EQ(ECHILD, errno);
errno = e;
break;
}
}
ASSERT_SYS(0, 0, sem_getvalue(s[1], &r));
ASSERT_EQ(0, r);
ASSERT_SYS(0, 0, sem_destroy(s[1]));
ASSERT_SYS(0, 0, sem_destroy(s[0]));
ASSERT_SYS(0, 0, munmap(sm, FRAMESIZE));
}