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Showing content from https://en.cppreference.com/w/cpp/language/../header/../thread/recursive_mutex/unlock.html below:

std::recursive_mutex::unlock - cppreference.com

void unlock();

(since C++11)

Unlocks the mutex if its level of ownership is 1 (there was exactly one more call to lock() than there were calls to unlock() made by this thread), reduces the level of ownership by 1 otherwise. The mutex must be locked by the current thread of execution, otherwise, the behavior is undefined.

This operation synchronizes-with (as defined in std::memory_order) any subsequent lock operation that obtains ownership of the same mutex.

[edit] Notes

unlock() is usually not called directly: std::unique_lock and std::lock_guard are used to manage exclusive locking.

[edit] Example [edit] See also locks the mutex, blocks if the mutex is not available
(public member function) [edit] tries to lock the mutex, returns if the mutex is not available
(public member function) [edit]

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