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// Copyright 2015 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <emscripten.h>
#include <emscripten/threading.h>
#include <emscripten/console.h>
#include <unistd.h>
#define NUM_THREADS 8
int numThreadsToCreateTotal = 50;
pthread_t thread[NUM_THREADS] = {};
volatile int counter = 0; // Shared data
pthread_mutex_t lock;
void sleepms(int msecs) {
// Test two different variants of sleeping to verify
// against bug https://bugzilla.mozilla.org/show_bug.cgi?id=1131757
#ifdef SPINLOCK_TEST
double t0 = emscripten_get_now();
double t1 = t0 + (double)msecs;
while(emscripten_get_now() < t1)
;
#else
usleep(msecs*1000);
#endif
}
void *ThreadMain(void *arg) {
pthread_mutex_lock(&lock);
int c = counter;
sleepms(100); // Create contention on the lock.
++c;
counter = c;
pthread_mutex_unlock(&lock);
pthread_exit(0);
}
void CreateThread(int i, int n) {
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setstacksize(&attr, 4*1024);
int rc = pthread_create(&thread[i], &attr, ThreadMain, 0);
if (rc != 0 || thread[i] == 0)
printf("Failed to create thread!\n");
pthread_attr_destroy(&attr);
}
int threadNum = 0;
bool WaitToJoin(double time, void *userData) {
int threadsRunning = 0;
// Join all threads.
for (int i = 0; i < NUM_THREADS; ++i) {
if (thread[i]) {
void *status;
int rc = pthread_join(thread[i], &status);
if (rc == 0) {
thread[i] = 0;
if (threadNum < numThreadsToCreateTotal) {
CreateThread(i, threadNum++);
++threadsRunning;
}
} else {
++threadsRunning;
}
}
}
if (!threadsRunning) {
if (counter == numThreadsToCreateTotal)
emscripten_outf("All threads finished. Counter = %d as expected", counter);
else
emscripten_errf("All threads finished, but counter = %d != %d!", counter, numThreadsToCreateTotal);
assert(counter == 50);
emscripten_force_exit(0);
return false;
}
return true;
}
int main() {
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&lock, &attr);
pthread_mutex_lock(&lock);
pthread_mutex_unlock(&lock);
// Create new threads in parallel.
for (int i = 0; i < NUM_THREADS; ++i) {
CreateThread(i, threadNum++);
}
emscripten_set_timeout_loop(WaitToJoin, 100, 0);
return 99;
}
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