mirror of
https://github.com/jart/cosmopolitan.git
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90 lines
3.5 KiB
C
90 lines
3.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/errno.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/macros.h"
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#include "libc/runtime/runtime.h"
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#include "libc/testlib/testlib.h"
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#include "libc/thread/thread.h"
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#define PROCESSES 8
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#define ITERATIONS 100000
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struct SharedMemory {
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pthread_mutex_t mutex;
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volatile long x;
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}* shm;
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void Worker(void) {
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long t;
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for (int i = 0; i < ITERATIONS; ++i) {
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pthread_mutex_lock(&shm->mutex);
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t = shm->x;
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t += 1;
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shm->x = t;
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pthread_mutex_unlock(&shm->mutex);
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}
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}
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TEST(lockipc, mutex) {
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int e, rc, ws, pid;
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// create shared memory
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shm = _mapshared(getpagesize());
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// create shared mutex
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pthread_mutexattr_t mattr;
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pthread_mutexattr_init(&mattr);
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pthread_mutexattr_settype(&mattr, PTHREAD_MUTEX_NORMAL);
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pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED);
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pthread_mutex_init(&shm->mutex, &mattr);
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pthread_mutexattr_destroy(&mattr);
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// create processes
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for (int i = 0; i < PROCESSES; ++i) {
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ASSERT_NE(-1, (rc = fork()));
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if (!rc) {
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Worker();
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_Exit(0);
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}
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}
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// wait for processes to finish
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for (;;) {
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e = errno;
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if ((pid = waitpid(-1, &ws, 0)) != -1) {
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if (WIFSIGNALED(ws)) {
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kprintf("process %d terminated with %G\n", pid, WTERMSIG(ws));
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testlib_incrementfailed();
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} else if (WEXITSTATUS(ws)) {
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kprintf("process %d exited with %d\n", pid, WEXITSTATUS(ws));
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testlib_incrementfailed();
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}
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} else {
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ASSERT_EQ(ECHILD, errno);
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errno = e;
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break;
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}
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}
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EXPECT_EQ(PROCESSES * ITERATIONS, shm->x);
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ASSERT_EQ(0, pthread_mutex_destroy(&shm->mutex));
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ASSERT_SYS(0, 0, munmap(shm, getpagesize()));
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}
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