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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 <assert.h>
#include <emscripten.h>
#include <pthread.h>
#include <stdio.h>
#include <atomic>
pthread_t thread;
std::atomic<int> tries;
static const int EXPECTED_TRIES = 7;
void loop() {
void* retval;
printf("try...\n");
if (pthread_tryjoin_np(thread, &retval) == 0) {
emscripten_cancel_main_loop();
assert(tries.load() == EXPECTED_TRIES);
#ifdef REPORT_RESULT
REPORT_RESULT(2);
#endif
}
tries++;
}
void *ThreadMain(void *arg) {
#ifdef TRY_JOIN
// Delay to force the main thread to try and fail a few times before
// succeeding.
while (tries.load() < EXPECTED_TRIES) {}
#endif
pthread_exit((void*)0);
}
pthread_t CreateThread() {
pthread_t ret;
int rc = pthread_create(&ret, NULL, ThreadMain, (void*)0);
assert(rc == 0);
return ret;
}
int main() {
if (!emscripten_has_threading_support()) {
#ifdef REPORT_RESULT
REPORT_RESULT(0);
#endif
printf("Skipped: Threading is not supported.\n");
return 0;
}
int x = EM_ASM_INT({
onerror = function(e) {
var message = e.toString();
var success = message.indexOf("Blocking on the main thread is not allowed by default. See https://emscripten.org/docs/porting/pthreads.html#blocking-on-the-main-browser-thread") >= 0;
if (success && !Module.reported) {
Module.reported = true;
console.log("reporting success");
// manually REPORT_RESULT; we shouldn't call back into native code at this point
var xhr = new XMLHttpRequest();
xhr.open("GET", "http://localhost:8888/report_result?0");
xhr.send();
}
};
return 0;
});
thread = CreateThread();
#ifdef TRY_JOIN
emscripten_set_main_loop(loop, 0, 0);
#else
int status;
// This should fail on the main thread.
puts("trying to block...");
pthread_join(thread, (void**)&status);
puts("blocked ok.");
#ifdef REPORT_RESULT
REPORT_RESULT(1);
#endif
#endif // TRY_JOIN
}
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