Standard library header <shared_mutex>

 

C++

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Algorithms library

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Input/output library

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Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Technical Specifications

 

Standard Library header files

Language Support
<cstddef> <limits> <climits> <cfloat> <cstdint> <new> <typeinfo> <exception> <ciso646>	<initializer_list> <csignal> <csetjmp> <cstdalign> <cstdarg> <cstdbool> <cstdlib> <ctime>
Diagnostics
<stdexcept> <cassert>	<cerrno> <system_error>
General utilities
<utility> <tuple> <bitset> <memory> <cstdlib> <cstring> <functional>	<type_traits> <ratio> <chrono> <ctime> <scoped_allocator> <typeindex>
Strings
<string> <cctype> <cwctype> <cstring>	<cwchar> <cstdlib> <cuchar>
Localization
<locale> <codecvt> <clocale>

Containers
<array> <deque> <forward_list> <list> <vector>	<map> <set> <unordered_map> <unordered_set> <queue> <stack>
Iterators
<iterator>
Algorithms
<algorithm>	<cstdlib>
Numerics
<cfenv> <complex> <random> <valarray>	<numeric> <cmath> <ctgmath> <cstdlib>
Input/Output
<iosfwd> <iostream> <ios> <streambuf> <istream> <ostream>	<iomanip> <sstream> <fstream> <cstdio> <cinttypes>
Regular expressions
<regex>
Thread support
<thread> <mutex> <atomic>	<shared_mutex> <condition_variable> <future>

 

This header is part of the thread support library.

Classes
shared_mutex (C++17)	provides shared mutual exclusion facility (class)
shared_timed_mutex (C++14)	provides shared mutual exclusion facility (class)
shared_lock (C++14)	implements movable shared mutex ownership wrapper (class template)
Functions
std::swap(std::shared_lock)	specialization of std::swap for shared_lock (function template)

Synopsis

namespace std {
    class shared_mutex;
    class shared_timed_mutex;
 
    template <class Mutex> class shared_lock;
 
    template <class Mutex>
    void swap(shared_lock<Mutex>& x, shared_lock<Mutex>& y) noexcept;
}

Class std::shared_mutex

class shared_mutex {
 public:
    typedef /*implementation-defined*/ native_handle_type;
 
    shared_mutex();
    ~shared_mutex();
    shared_mutex(const shared_mutex&) = delete;
    shared_mutex& operator=(const shared_mutex&) = delete;
 
    // Exclusive ownership
    void lock(); // blocking
    bool try_lock();
    void unlock();
 
    // Shared ownership
    void lock_shared(); // blocking
    bool try_lock_shared();
    void unlock_shared();
 
    // Getters
    native_handle_type native_handle();
};

Class std::shared_timed_mutex

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 ownership
    void lock(); // blocking
    bool 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 ownership
    void lock_shared(); // blocking
    bool 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();
};

Class std::shared_lock

template <class Mutex>
class shared_lock {
 public:
    typedef Mutex mutex_type;
 
    shared_lock() noexcept;
    explicit shared_lock(mutex_type& m); // blocking
    shared_lock(mutex_type& m, defer_lock_t) noexcept;
    shared_lock(mutex_type& m, try_to_lock_t);
    shared_lock(mutex_type& m, adopt_lock_t);
    template <class Clock, class Duration>
    shared_lock(mutex_type& m,
    const chrono::time_point<Clock, Duration>& abs_time);
    template <class Rep, class Period>
    shared_lock(mutex_type& m,
    const chrono::duration<Rep, Period>& rel_time);
    ~shared_lock();
    shared_lock(shared_lock const&) = delete;
    shared_lock& operator=(shared_lock const&) = delete;
    shared_lock(shared_lock&& u) noexcept;
    shared_lock& operator=(shared_lock&& u) noexcept;
 
    void lock(); // blocking
    bool 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();
 
    // Setters
    void swap(shared_lock& u) noexcept;
    mutex_type* release() noexcept;
 
    // Getters
    bool owns_lock() const noexcept;
    explicit operator bool () const noexcept;
    mutex_type* mutex() const noexcept;
 
 private:
    mutex_type* pm; // exposition only
    bool owns; // exposition only
};