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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: libcpp-has-no-threads
// UNSUPPORTED: c++98, c++03, c++11
// <shared_mutex>
// template <class Mutex> class shared_lock;
// mutex_type* release() noexcept;
#include <shared_mutex>
#include <cassert>
struct mutex
{
static int lock_count;
static int unlock_count;
void lock_shared() {++lock_count;}
void unlock_shared() {++unlock_count;}
};
int mutex::lock_count = 0;
int mutex::unlock_count = 0;
mutex m;
int main(int, char**)
{
std::shared_lock<mutex> lk(m);
assert(lk.mutex() == &m);
assert(lk.owns_lock() == true);
assert(mutex::lock_count == 1);
assert(mutex::unlock_count == 0);
assert(lk.release() == &m);
assert(lk.mutex() == nullptr);
assert(lk.owns_lock() == false);
assert(mutex::lock_count == 1);
assert(mutex::unlock_count == 0);
static_assert(noexcept(lk.release()), "release must be noexcept");
return 0;
}
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