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52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// UNSUPPORTED: libcpp-has-no-threads
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// UNSUPPORTED: c++98, c++03, c++11
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// <shared_mutex>
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// template <class Mutex> class shared_lock;
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// mutex_type* release() noexcept;
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#include <shared_mutex>
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#include <cassert>
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#include "test_macros.h"
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struct mutex
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{
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static int lock_count;
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static int unlock_count;
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void lock_shared() {++lock_count;}
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void unlock_shared() {++unlock_count;}
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};
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int mutex::lock_count = 0;
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int mutex::unlock_count = 0;
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mutex m;
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int main(int, char**)
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{
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std::shared_lock<mutex> lk(m);
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assert(lk.mutex() == &m);
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assert(lk.owns_lock() == true);
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assert(mutex::lock_count == 1);
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assert(mutex::unlock_count == 0);
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assert(lk.release() == &m);
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assert(lk.mutex() == nullptr);
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assert(lk.owns_lock() == false);
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assert(mutex::lock_count == 1);
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assert(mutex::unlock_count == 0);
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static_assert(noexcept(lk.release()), "release must be noexcept");
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return 0;
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}
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