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Showing content from https://cplusplus.com/reference/mutex/recursive_timed_mutex/try_lock/ below:

public member function

<mutex>

std::recursive_timed_mutex::try_lock

bool try_lock() noexcept;

Lock recursive timed mutex if not locked

Attempts to lock the recursive_timed_mutex, without blocking (it behaves exactly as in recursive_mutex):

If the recursive_timed_mutex isn't currently locked by any thread, the calling thread locks it (from this point, and until its member unlock is called, the thread owns the recursive_timed_mutex).
If the recursive_timed_mutex is currently locked by another thread, the function fails and returns false, without blocking (the calling thread continues its execution).
If the recursive_timed_mutex is currently locked by the same thread calling this function, the thread acquires a new level of ownership over the recursive_timed_mutex. Unlocking the recursive_timed_mutex completely will require an additional call to member unlock.

This function may fail spuriously when no other thread has a lock on the recursive_timed_mutex, but repeated calls in these circumstances shall succeed at some point.

All lock and unlock operations on the recursive_timed_mutex follow a single total order, with all visible effects synchronized between the lock operations and previous unlock operations on the same object.

Parameters none

Return valuetrue if the function succeeds in locking the recursive_timed_mutex for the thread.
false otherwise.

Data races The recursive_timed_mutex object is accessed/modified as an atomic operation (causes no data races).

Exception safetyNo-throw guarantee: never throws exceptions.

See also

recursive_timed_mutex::try_lock_for: Try to lock for time span (public member function)

recursive_timed_mutex::try_lock_until: Try to lock until time point (public member function)

recursive_timed_mutex::lock: Lock recursive timed mutex (public member function)

recursive_timed_mutex::unlock: Unlock timed mutex (public member function)

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