1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// UNSUPPORTED: libcpp-has-no-threads 11 12// <mutex> 13 14// template <class Mutex> class unique_lock; 15 16// mutex_type* release() noexcept; 17 18#include <mutex> 19#include <cassert> 20 21struct mutex 22{ 23 static int lock_count; 24 static int unlock_count; 25 void lock() {++lock_count;} 26 void unlock() {++unlock_count;} 27}; 28 29int mutex::lock_count = 0; 30int mutex::unlock_count = 0; 31 32mutex m; 33 34int main() 35{ 36 std::unique_lock<mutex> lk(m); 37 assert(lk.mutex() == &m); 38 assert(lk.owns_lock() == true); 39 assert(mutex::lock_count == 1); 40 assert(mutex::unlock_count == 0); 41 assert(lk.release() == &m); 42 assert(lk.mutex() == nullptr); 43 assert(lk.owns_lock() == false); 44 assert(mutex::lock_count == 1); 45 assert(mutex::unlock_count == 0); 46} 47