Webb17 nov. 2015 · 1 Answer. shared_mutex.lock_shared () is a function call that locks shared_mutex in a shared mode, while shared_lock is a "lock-class" that is used to lock and automatically unlock mutex at the end of the scope. No, you can use shared_lock with any type that meets the SharedMutex requirements. Webbshared_mutex::native_handle. void lock(); (since C++17) Locks the mutex. If another thread has already locked the mutex, a call to lock will block execution until the lock is acquired. If lock is called by a thread that already owns the mutex in any mode (shared or exclusive), the behavior is undefined.
C++多线程——读写锁shared_lock/shared_mutex - CSDN博客
Webb18 okt. 2024 · The behavior is undefined if Mutexdoes not meet the SharedTimedLockablerequirements. 8)Tries to lock the associated mutex in shared mode by calling m.try_lock_shared_until(timeout_time), which blocks until specified timeout_timehas been reached or the lock is acquired, whichever comes first. WebbAccepted answer As pointed out by various commentators, who have read the implementation code of the C++ standard library: Yes, the use of a std::shared_mutex wrapped inside a std::shared_lock () as one of the arguments to std::scoped_lock () is safe. Basically, a std::shared_lock forwards all calls to lock () to lock_shared () on the mutex. dfars aws
c++ - 線程本地存儲的 std::shared_mutex 遞歸保護 - 堆棧內存溢出
Webb這個想法是可以使用std::shared mutex ,但在同一線程調用用於獨占訪問的std::shared mutex::lock 情況下保護死鎖。 例如: f 會鎖定,因為 std::shared mutex 不能遞歸調用。 為此,我有兩個選擇:要么使用我自己的讀寫互斥鎖tlock ,它使用支持 WebbThe lock is a data structure that is part of the mutex that keeps track of who currently has exclusive access to the data. Therefore, the mutex is described as guarding the data it holds via the locking system. Mutexes have a reputation for being difficult to use because you have to remember two rules: Webb11 apr. 2024 · To use a Shared Mutex in C++, you can use the std::shared_mutex class from the standard library. The std::shared_lock and std::unique_lock classes are used to lock and unlock the Shared Mutex. Here's an example of how to use a Shared Mutex to protect a shared resource: dfars 7012 7019 and 7020 enforcement