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// Copyright 2019 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 <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <assert.h>
#include <emscripten.h>
#include <atomic>
#define NUM_THREADS 2
#define TOTAL 100
static std::atomic<int> sum;
void *ThreadMain(void *arg) {
for (int i = 0; i < TOTAL; i++) {
sum++;
// wait for a change, so we see interleaved processing.
int last = sum.load();
while (sum.load() == last) {}
}
pthread_exit((void*)TOTAL);
}
pthread_t thread[NUM_THREADS];
void CreateThread(int i)
{
static int counter = 1;
int rc = pthread_create(&thread[i], nullptr, ThreadMain, (void*)i);
assert(rc == 0);
}
void mainn() {
static int main_adds = 0;
int worker_adds = sum.load() - main_adds;
sum++;
main_adds++;
printf("main iter %d : %d\n", main_adds, worker_adds);
if (worker_adds == NUM_THREADS * TOTAL) {
printf("done!\n");
#ifndef ALLOW_SYNC
emscripten_cancel_main_loop();
#else
exit(0);
#endif
}
}
int main() {
// Create initial threads.
for(int i = 0; i < NUM_THREADS; ++i) {
CreateThread(i);
}
// if we don't allow sync pthread creation, the event loop must be reached for
// the worker to start up.
#ifndef ALLOW_SYNC
emscripten_set_main_loop(mainn, 0, 0);
#else
while (1) mainn();
#endif
}
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