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main_thread_join.cpp

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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);

emscripten_force_exit(2);

}

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() {

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.");

return 0;

#endif // TRY_JOIN

}