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std::shared...lock_shared(3) C++ Standard Libary std::shared...lock_shared(3) NAME std::shared_mutex::lock_shared - std::shared_mutex::lock_shared Synopsis void lock_shared(); (since C++17) Acquires shared ownership of the mutex. If another thread is holding the mutex in exclusive ownership, a call to lock_shared will block execution un- til shared ownership can be acquired. If lock_shared is called by a thread that already owns the mutex in any mode (exclusive or shared), the behavior is undefined. If more than the implementation-defined maximum number of shared owners already locked the mutex in shared mode, lock_shared blocks execution until the number of shared owners is reduced. The maximum number of owners is guaranteed to be at least 10000. A prior unlock() operation on the same mutex synchronizes-with (as defined in std::memory_order) this operation. Parameters (none) Return value (none) Exceptions Throws std::system_error when errors occur, including errors from the underlying operating system that would prevent lock from meeting its specifica- tions. The mutex is not locked in the case of any exception being thrown. Notes lock_shared() is usually not called directly: std::shared_lock is used to manage shared locking. Example This section is incomplete Reason: no example See also lock locks the mutex, blocks if the mutex is not avail- able (public member function) tries to lock the mutex for shared ownership, re- turns if the mutex try_lock_shared is not available (public member function) unlock_shared unlocks the mutex (shared ownership) (public member function) http://cppreference.com 2022.07.31 std::shared...lock_shared(3)
NAME | Synopsis | Parameters | Return value | Exceptions | Notes | Example | See also
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