tmp/tmpx94xxzj4/{from.md → to.md}
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##### Class shared_mutex <a id="thread.sharedmutex.class">[[thread.sharedmutex.class]]</a>
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``` cpp
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namespace std {
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class shared_mutex {
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public:
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shared_mutex();
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~shared_mutex();
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shared_mutex(const shared_mutex&) = delete;
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shared_mutex& operator=(const shared_mutex&) = delete;
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// Exclusive ownership
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void lock(); // blocking
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bool try_lock();
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void unlock();
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// Shared ownership
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void lock_shared(); // blocking
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bool try_lock_shared();
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void unlock_shared();
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using native_handle_type = implementation-defined; // See~[thread.req.native]
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native_handle_type native_handle(); // See~[thread.req.native]
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};
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}
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```
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The class `shared_mutex` provides a non-recursive mutex with shared
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ownership semantics.
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The class `shared_mutex` shall satisfy all of the shared mutex
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requirements ([[thread.sharedmutex.requirements]]). It shall be a
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standard-layout class (Clause [[class]]).
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The behavior of a program is undefined if:
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- it destroys a `shared_mutex` object owned by any thread,
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- a thread attempts to recursively gain any ownership of a
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`shared_mutex`, or
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- a thread terminates while possessing any ownership of a
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`shared_mutex`.
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`shared_mutex` may be a synonym for `shared_timed_mutex`.
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