| //===----------------------------------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // 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() |
| { |
| 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"); |
| } |