mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
7822917fc2
You can now do things like implement mutexes using futexes in your redbean lua code. This provides the fastest possible inter-process communication for your production systems when SQLite alone as ipc or things like pipes aren't sufficient.
92 lines
3.5 KiB
C
92 lines
3.5 KiB
C
/*-*- 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/errno.h"
|
|
#include "libc/intrin/bits.h"
|
|
#include "libc/intrin/intrin.h"
|
|
#include "libc/intrin/kprintf.h"
|
|
#include "libc/macros.internal.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/testlib/testlib.h"
|
|
#include "libc/thread/thread.h"
|
|
|
|
#define PROCESSES 8
|
|
#define ITERATIONS 100000
|
|
|
|
struct SharedMemory {
|
|
pthread_mutex_t mutex;
|
|
volatile long x;
|
|
} * shm;
|
|
|
|
void Worker(void) {
|
|
long t;
|
|
for (int i = 0; i < ITERATIONS; ++i) {
|
|
pthread_mutex_lock(&shm->mutex);
|
|
t = shm->x;
|
|
t += 1;
|
|
shm->x = t;
|
|
pthread_mutex_unlock(&shm->mutex);
|
|
}
|
|
}
|
|
|
|
TEST(lockipc, mutex) {
|
|
int e, rc, ws, pid;
|
|
|
|
// create shared memory
|
|
shm = _mapshared(FRAMESIZE);
|
|
|
|
// create shared mutex
|
|
pthread_mutexattr_t mattr;
|
|
pthread_mutexattr_init(&mattr);
|
|
pthread_mutexattr_settype(&mattr, PTHREAD_MUTEX_NORMAL);
|
|
pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED);
|
|
pthread_mutex_init(&shm->mutex, &mattr);
|
|
pthread_mutexattr_destroy(&mattr);
|
|
|
|
// create processes
|
|
for (int i = 0; i < PROCESSES; ++i) {
|
|
ASSERT_NE(-1, (rc = fork()));
|
|
if (!rc) {
|
|
Worker();
|
|
_Exit(0);
|
|
}
|
|
}
|
|
|
|
// wait for processes to finish
|
|
for (;;) {
|
|
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;
|
|
}
|
|
}
|
|
|
|
EXPECT_EQ(PROCESSES * ITERATIONS, shm->x);
|
|
ASSERT_EQ(0, pthread_mutex_destroy(&shm->mutex));
|
|
ASSERT_SYS(0, 0, munmap(shm, FRAMESIZE));
|
|
}
|