[thread.sharedtimedmutex.class]

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

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

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

#### 32.6.4.5 Shared timed mutex types [[thread.sharedtimedmutex.requirements]](thread.sharedtimedmutex.requirements#thread.sharedtimedmutex.class)

#### 32.6.4.5.2 Class shared_timed_mutex [thread.sharedtimedmutex.class]

[ð](#lib:shared_timed_mutex)

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

 shared_timed_mutex(const shared_timed_mutex&) = delete;
 shared_timed_mutex& operator=(const shared_timed_mutex&) = delete; // exclusive ownershipvoid 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(); // shared ownershipvoid lock_shared(); // blockingbool try_lock_shared(); template<class Rep, class Period>bool try_lock_shared_for(const chrono::duration<Rep, Period>& rel_time); template<class Clock, class Duration>bool try_lock_shared_until(const chrono::time_point<Clock, Duration>& abs_time); void unlock_shared(); };}

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L8123)

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

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L8127)

The class shared_timed_mutex meets
all of the shared timed mutex requirements ([[thread.sharedtimedmutex.requirements]](thread.sharedtimedmutex.requirements "32.6.4.5 Shared 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#L8132)

The behavior of a program is undefined if

- [(3.1)](#3.1)

it destroys a shared_timed_mutex object owned by any thread,

- [(3.2)](#3.2)

a thread attempts to recursively gain any ownership of a shared_timed_mutex, or

- [(3.3)](#3.3)

a thread terminates while possessing any ownership of a shared_timed_mutex[.](#3.sentence-1)
