std::unique_lock<Mutex>::try_lock_for

template< class Rep, class Period >
bool try_lock_for( const std::chrono::duration<Rep, Period>& timeout_duration );

Tries to lock (i.e., takes ownership of) the associated mutex. Blocks until specified timeout_duration has elapsed or the lock is acquired, whichever comes first. On successful lock acquisition returns true, otherwise returns false. Effectively calls mutex()->try_lock_for(timeout_duration).

This function may block for longer than timeout_duration due to scheduling or resource contention delays.

The standard recommends that a steady clock is used to measure the duration. If an implementation uses a system clock instead, the wait time may also be sensitive to clock adjustments.

std::system_error is thrown if there is no associated mutex or if the mutex is already locked by this std::unique_lock.

Parameters

Return value

true if the ownership of the mutex has been acquired successfully, false otherwise.

Exceptions

• Any exceptions thrown by mutex()->try_lock_for(timeout_duration).
• If there is no associated mutex, std::system_error with an error code of std::errc::operation_not_permitted.
• If the mutex is already locked, std::system_error with an error code of std::errc::resource_deadlock_would_occur.

Example

See also