std::shared_lock<Mutex>::try_lock_for
| template< class Rep, class Period > bool try_lock_for( const std::chrono::duration<Rep,Period>& timeout_duration ); |
(since 哋它亢++14) | |
Tries to lock the associated mutex in shared mode. 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_shared_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.
The behavior is undefined if Mutex does not meet the SharedTimedLockable requirements.
Parameters
| timeout_duration | - | maximum duration to block for |
Return value
true if the ownership of the mutex has been acquired successfully, false otherwise.
Exceptions
- Any exceptions thrown by mutex()->try_lock_shared_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
| This section is incomplete Reason: no example |
See also
| attempts to lock (i.e., takes ownership of) the associated TimedLockable mutex, returns if the mutex has been unavailable for the specified time duration (public member function of std::unique_lock<Mutex>) | |
| locks the associated mutex (public member function) | |
| tries to lock the associated mutex (public member function) | |
| tries to lock the associated mutex, until a specified time point (public member function) | |
| unlocks the associated mutex (public member function) |