diff options
Diffstat (limited to 'test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_try_to_lock.pass.cpp')
-rw-r--r-- | test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_try_to_lock.pass.cpp | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_try_to_lock.pass.cpp b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_try_to_lock.pass.cpp new file mode 100644 index 000000000000..cea58c554a9b --- /dev/null +++ b/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_try_to_lock.pass.cpp @@ -0,0 +1,64 @@ +//===----------------------------------------------------------------------===// +// +// 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 + +// <mutex> + +// template <class Mutex> class unique_lock; + +// unique_lock(mutex_type& m, try_to_lock_t); + +#include <mutex> +#include <thread> +#include <cstdlib> +#include <cassert> + +std::mutex m; + +typedef std::chrono::system_clock Clock; +typedef Clock::time_point time_point; +typedef Clock::duration duration; +typedef std::chrono::milliseconds ms; +typedef std::chrono::nanoseconds ns; + +void f() +{ + time_point t0 = Clock::now(); + { + std::unique_lock<std::mutex> lk(m, std::try_to_lock); + assert(lk.owns_lock() == false); + } + { + std::unique_lock<std::mutex> lk(m, std::try_to_lock); + assert(lk.owns_lock() == false); + } + { + std::unique_lock<std::mutex> lk(m, std::try_to_lock); + assert(lk.owns_lock() == false); + } + while (true) + { + std::unique_lock<std::mutex> lk(m, std::try_to_lock); + if (lk.owns_lock()) + break; + } + time_point t1 = Clock::now(); + ns d = t1 - t0 - ms(250); + assert(d < ms(200)); // within 200ms +} + +int main() +{ + m.lock(); + std::thread t(f); + std::this_thread::sleep_for(ms(250)); + m.unlock(); + t.join(); +} |