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std::shared_timed_mutex::try_lock_shared_for(3) | C++ Standard Libary | std::shared_timed_mutex::try_lock_shared_for(3) |
NAME¶
std::shared_timed_mutex::try_lock_shared_for - std::shared_timed_mutex::try_lock_shared_for
Synopsis¶
template< class Rep, class Period >
bool try_lock_shared_for( const std::chrono::duration<Rep,Period>&
(since C++14)
timeout_duration );
Tries to lock the mutex in shared mode. Blocks until specified
timeout_duration has
elapsed or the shared lock is acquired, whichever comes first. On successful
lock
acquisition returns true, otherwise returns false.
If timeout_duration is less or equal timeout_duration.zero(), the function
behaves
like try_lock_shared().
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.
As with try_lock_shared(), this function is allowed to fail spuriously and
return
false even if the mutex was not locked by any other thread at some point
during
timeout_duration.
Prior unlock() operation on the same mutex synchronizes-with (as defined in
std::memory_order) this operation if it returns true.
If try_lock_shared_for is called by a thread that already owns the mutex in
any mode
(shared or exclusive), the behavior is undefined.
Parameters¶
timeout_duration - maximum duration to block for
Return value¶
true if the lock was acquired successfully, otherwise false.
Exceptions¶
Any exception thrown by clock, time_point, or duration during the
execution (clocks,
time points, and durations provided by the standard library never throw)
Example¶
This section is incomplete
Reason: no example
See also¶
tries to lock the mutex for shared ownership, returns if the
try_lock_shared mutex is not available
(public member function)
tries to lock the mutex for shared ownership, returns if the
try_lock_shared_until mutex has been
unavailable until specified time point has been reached
(public member function)
tries to lock the mutex, returns if the mutex has been
try_lock_for unavailable for the specified timeout duration
(public member function)
2022.07.31 | http://cppreference.com |