43 lines
904 B
C++
43 lines
904 B
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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
|
|
|
|
// <mutex>
|
|
|
|
// template <class Mutex> class lock_guard;
|
|
|
|
// lock_guard(mutex_type& m, adopt_lock_t);
|
|
|
|
#include <mutex>
|
|
#include <cstdlib>
|
|
#include <cassert>
|
|
|
|
#include "make_test_thread.h"
|
|
#include "test_macros.h"
|
|
|
|
std::mutex m;
|
|
|
|
void do_try_lock() {
|
|
assert(m.try_lock() == false);
|
|
}
|
|
|
|
int main(int, char**) {
|
|
{
|
|
m.lock();
|
|
std::lock_guard<std::mutex> lg(m, std::adopt_lock);
|
|
std::thread t = support::make_test_thread(do_try_lock);
|
|
t.join();
|
|
}
|
|
|
|
m.lock();
|
|
m.unlock();
|
|
|
|
return 0;
|
|
}
|