[thread.timedmutex.class]

# 32 Concurrency support library [[thread]](./#thread)

## 32.6 Mutual exclusion [[thread.mutex]](thread.mutex#thread.timedmutex.class)

### 32.6.4 Mutex requirements [[thread.mutex.requirements]](thread.mutex.requirements#thread.timedmutex.class)

#### 32.6.4.3 Timed mutex types [[thread.timedmutex.requirements]](thread.timedmutex.requirements#thread.timedmutex.class)

#### 32.6.4.3.2 Class timed_mutex [thread.timedmutex.class]

[🔗](#lib:timed_mutex)

namespace std {class timed_mutex {public: timed_mutex(); ~timed_mutex();

 timed_mutex(const timed_mutex&) = delete;
 timed_mutex& operator=(const timed_mutex&) = delete; void lock(); // blockingbool try_lock(); template<class Rep, class Period>bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); template<class Clock, class Duration>bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); void unlock(); using native_handle_type = *implementation-defined*; // see [[thread.req.native]](thread.req.native "32.2.3 Native handles") native_handle_type native_handle(); // see [[thread.req.native]](thread.req.native "32.2.3 Native handles")};}

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L7723)

The class timed_mutex provides a non-recursive mutex with exclusive ownership
semantics[.](#1.sentence-1)

If one thread owns a timed_mutex object, attempts by another thread
to acquire ownership of that object will fail (for try_lock()) or block
(for lock(), try_lock_for(), and try_lock_until()) until
the owning thread has released ownership with a call to unlock() or the
call to try_lock_for() or try_lock_until() times out (having
failed to obtain ownership)[.](#1.sentence-2)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L7733)

The class timed_mutex meets
all of the timed mutex requirements ([[thread.timedmutex.requirements]](thread.timedmutex.requirements "32.6.4.3 Timed mutex types"))[.](#2.sentence-1)

It is a standard-layout class ([[class.prop]](class.prop "11.2 Properties of classes"))[.](#2.sentence-2)

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L7738)

The behavior of a program is undefined if

- [(3.1)](#3.1)

it destroys a timed_mutex object owned by any thread,

- [(3.2)](#3.2)

a thread that owns a timed_mutex object calls lock(),try_lock(), try_lock_for(), or try_lock_until() on that object, or

- [(3.3)](#3.3)

a thread terminates while owning a timed_mutex object[.](#3.sentence-1)