llvm/libcxx/test/libcxx/thread/thread.condition/PR30202_notify_from_pthread_created_thread.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: no-threads
// REQUIRES: libcpp-has-thread-api-pthread

// notify_all_at_thread_exit(...) requires move semantics to transfer the
// unique_lock.
// UNSUPPORTED: c++03

// <condition_variable>

// void notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk);

// Test that this function works with threads that were not created by
// std::thread. See https://llvm.org/PR30202


#include <condition_variable>
#include <mutex>
#include <thread>
#include <chrono>
#include <cassert>
#include <pthread.h>

#include "test_macros.h"

std::condition_variable cv;
std::mutex mut;
bool exited = false;

typedef std::chrono::milliseconds ms;
typedef std::chrono::high_resolution_clock Clock;

void* func(void*)
{
    std::unique_lock<std::mutex> lk(mut);
    std::notify_all_at_thread_exit(cv, std::move(lk));
    std::this_thread::sleep_for(ms(300));
    exited = true;
    return nullptr;
}

int main(int, char**)
{
    {
    std::unique_lock<std::mutex> lk(mut);
    pthread_t id;
    int res = pthread_create(&id, 0, &func, nullptr);
    assert(res == 0);
    Clock::time_point t0 = Clock::now();
    assert(exited == false);
    cv.wait(lk);
    Clock::time_point t1 = Clock::now();
    assert(exited);
    assert(t1-t0 > ms(250));
    pthread_join(id, 0);
    }
    exited = false;
    {
    std::unique_lock<std::mutex> lk(mut);
    std::thread t(&func, nullptr);
    Clock::time_point t0 = Clock::now();
    assert(exited == false);
    cv.wait(lk);
    Clock::time_point t1 = Clock::now();
    assert(exited);
    assert(t1-t0 > ms(250));
    t.join();
    }

  return 0;
}