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//===----------------------------------------------------------------------===//
//
// 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
// UNSUPPORTED: c++03
// ALLOW_RETRIES: 2
// <mutex>
// template <class Mutex> class unique_lock;
// bool try_lock();
#include <cassert>
#include <mutex>
#include <system_error>
#include "test_macros.h"
bool try_lock_called = false;
struct mutex
{
bool try_lock()
{
try_lock_called = !try_lock_called;
return try_lock_called;
}
void unlock() {}
};
mutex m;
int main(int, char**)
{
std::unique_lock<mutex> lk(m, std::defer_lock);
assert(lk.try_lock() == true);
assert(try_lock_called == true);
assert(lk.owns_lock() == true);
#ifndef TEST_HAS_NO_EXCEPTIONS
try
{
TEST_IGNORE_NODISCARD lk.try_lock();
assert(false);
}
catch (std::system_error& e)
{
assert(e.code().value() == EDEADLK);
}
#endif
lk.unlock();
assert(lk.try_lock() == false);
assert(try_lock_called == false);
assert(lk.owns_lock() == false);
lk.release();
#ifndef TEST_HAS_NO_EXCEPTIONS
try
{
TEST_IGNORE_NODISCARD lk.try_lock();
assert(false);
}
catch (std::system_error& e)
{
assert(e.code().value() == EPERM);
}
#endif
return 0;
}
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