WebFeb 6, 2024 · Description. lock. Blocks the calling thread until the thread obtains ownership of the mutex. native_handle. Returns the implementation-specific type that represents … WebMar 18, 2024 · To acquire the shared mutex in shared mode, the mutex must either be unowned or owned in shared mode (value zero or positive), and after we’re done, it will …
std::mutex::unlock - cppreference.com
See my comment about the lack of std::defer_lock in the constructor. But you also have a race condition in your code. The acquire_lock function modifies the m_lock under protection of the m_mutex mutex. Thus, to ensure thread safety, no other thread can modify m_lock except while holding m_mutex.. But the release_lock function modifies m_lock while it is releasing that mutex. WebRemember, you need to ensure you only call unlock after the mutex has been locked by the current thread. This was a surprise today when debugging some of my co-worker's code. "The mutex must be locked by the current thread … desk light shade factory
Programming Concurrency in C++: Part 2
WebMar 3, 2024 · class Race_condition { public: std::mutex mutex; int n; Race_condition() :n(0) {} void increment() { mutex.lock(); ++n; mutex.unlock(); } }; You create a mutex by instantiating std::mutex, … WebOct 2, 2024 · meth1 locks the mutex, then reads values from the input file until it hits the end of the file. So the last value that it read is in variable. Then it unlocks the mutex. If you're lucky, meth2 will see the value that was written. If you're not lucky, meth2 will have already run, and seen the value 0. This kind of lock-step manipulation of ... WebOct 18, 2024 · std:: lock_guard. The class lock_guard is a mutex wrapper that provides a convenient RAII-style mechanism for owning a mutex for the duration of a scoped block. When a lock_guard object is created, it attempts to take ownership of the mutex it is given. When control leaves the scope in which the lock_guard object was created, the … chuck norris best fight scenes