Guarded suspension

In concurrent programming, guarded suspension is a software design pattern for managing operations that require both a lock to be acquired and a precondition to be satisfied before the operation can be executed. The guarded suspension pattern is typically applied to method calls in object-oriented programs, and involves suspending the method call, and the calling thread, until the precondition (acting as a guard) is satisfied.

Usage
Because it is blocking, the guarded suspension pattern is generally only used when the developer knows that a method call will be suspended for a finite and reasonable period of time. If a method call is suspended for too long, then the overall program will slow down or stop, waiting for the precondition to be satisfied. If the developer knows that the method call suspension will be indefinite or for an unacceptably long period, then the balking pattern may be preferred.

Implementation
In Java, the Object class provides the  and   methods to assist with guarded suspension. In the implementation below, originally found in, if there is no precondition satisfied for the method call to be successful, then the method will wait until it finally enters a valid state.

An example of an actual implementation would be a queue object with a  method that has a guard to detect when there are no items in the queue. Once the  method notifies the other methods (for example, a   method), then the   method can exit its guarded state and proceed with a call. Once the queue is empty, then the  method will enter a guarded state once again.