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Showing content from https://cplusplus.com/recursive_mutex below:

class

<mutex>

std::recursive_mutex

Recursive mutex class

A recursive mutex is a lockable object, just like mutex, but allows the same thread to acquire multiple levels of ownership over the mutex object.

This allows to lock (or try-lock) the mutex object from a thread that is already locking it, acquiring a new level of ownership over the mutex object: the mutex object will actually remain locked owning the thread until its member unlock is called as many times as this level of ownership.

It is guaranteed to be a standard-layout class.

Member types member type description native_handle_type Type returned by native_handle (only defined if library implementation supports it)
Member functions

(constructor): Construct recursive_mutex (public member function)

lock: Lock recursive mutex (public member function)

try_lock: Lock mutex if not locked by other threads (public member function)

unlock: Unlocks mutex (public member function)

native_handle: Get native handle (public member function)

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