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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 <pthread.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include <unistd.h>
#include <errno.h>
#include <emscripten/console.h>
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
_Atomic long res = 43;
_Atomic int started = false;
static void cleanup_handler(void *arg)
{
long a = (long)arg;
emscripten_outf("Called clean-up handler with arg %ld", a);
res -= a;
}
static void *thread_start(void *arg) {
// Setup thread for async cancelation only
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
pthread_cleanup_push(cleanup_handler, (void*)42);
emscripten_out("Thread started!");
// Signal the main thread that are started
started = true;
// This mutex is locked by the main thread so this call should never return.
// pthread_mutex_lock is not a cancellation point so deferred cancellation
// won't work here, async cancelation should.
pthread_mutex_lock(&mutex);
assert(false && "pthread_mutex_lock returned!");
pthread_cleanup_pop(0);
}
int main() {
pthread_mutex_lock(&mutex);
emscripten_out("Starting thread..");
pthread_t thr;
int s = pthread_create(&thr, NULL, thread_start, (void*)0);
assert(s == 0);
// Busy wait until thread is started
while (!started) {
sched_yield();
}
emscripten_out("Canceling thread..");
s = pthread_cancel(thr);
assert(s == 0);
// Busy wait until thread cancel handler has been run
while (res != 1) {
sched_yield();
}
emscripten_out("Joining thread..");
s = pthread_join(thr, NULL);
assert(s == 0);
emscripten_out("done");
return 0;
}
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