The SharedLockable requirements describe the minimal characteristics of types that provide shared blocking semantics for execution agents (i.e. threads).
For type L to be SharedLockable, the following conditions have to be satisfied for an object m of type L:
| Expression | Preconditions | Effects | Return value |
|---|---|---|---|
m.lock_shared() | Blocks until a lock can be obtained for the current execution agent (thread, process, task). If an exception is thrown, no lock is obtained. | ||
m.try_lock_shared() | Attempts to obtain a lock for the current execution agent (thread, process, task) without blocking. If an exception is thrown, no lock is obtained. |
true if the lock was obtained, false otherwise |
|
m.unlock_shared() | The current execution agent holds a shared lock on m. | Releases the shared lock held by the execution agent. Throws no exceptions. |
A lock on an object is said to be shared lock if it is acquired by a call to lock_shared, try_lock_shared, try_lock_shared_for, or try_lock_shared_until member function.
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