C++ named requirements: SharedTimedLockable (since C++14)

The SharedTimedLockable requirements describe the characteristics of types that provide timed shared blocking semantics for execution agents (threads, processes, tasks).

Requirements

• SharedLockable

For type L to be SharedTimedLockable , given

• rel_time , a value of a specialization of std::chrono::duration , and
• abs_time , a value of a specialization of std::chrono::time_point ,

the following conditions have to be satisfied for an object m of type L :

Expression	Requires	Return value
m. try_lock_shared_for ( rel_time )	Blocks for the provided duration rel_time or until a lock on m is acquired.	true if the lock was acquired, false otherwise.
m. try_lock_shared_until ( abs_time )	Blocks until the provided time point abs_time is reached or a lock on m is acquired.	true if the lock was acquired, false otherwise.

Notes

The try_lock_shared_for and try_lock_shared_until member functions obtain a shared lock on m on success.

Standard library

The following standard library types satisfy SharedTimedLockable requirements:

shared_timed_mutex (C++14)

provides shared mutual exclusion facility and implements locking with a timeout (class)

See also

• Thread support library
• SharedTimedMutex
• SharedLockable