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In Java, the Object class provides the wait() and notify() methods to assist with guarded suspension. In the implementation below, originally found in Kuchana (2004) , 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.
System.Threading.ThreadPool is configured to have a predefined number of threads to allocate. When the threads are returned, they are available for another computation. Thus, one can use threads without paying the cost of creation and disposal of threads. The following shows the basic code of the object pool design pattern implemented using C#.
An interrupt tells a thread that it should stop what it is doing and do something else. A thread sends an interrupt by invoking interrupt() on the Thread object for the thread to be interrupted. The interrupt mechanism is implemented using an internal boolean flag known as the "interrupted status". [8] Invoking interrupt() sets this flag. [9]
The active object design pattern decouples method execution from method invocation for objects that each reside in their own thread of control. [1] The goal is to introduce concurrency, by using asynchronous method invocation and a scheduler for handling requests.
This introduces the concept of a thread. A thread may be viewed as a sub-process; that is, a separate, independent sequence of execution within the code of one process. Threads are becoming increasingly important in the design of distributed and client–server systems and in software run on multi-processor systems.
In most programming languages a called method is executed synchronously, i.e. in the thread of execution from which it is invoked. If the method takes a long time to complete, e.g. because it is loading data over the internet, the calling thread is blocked until the method has finished.
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The Java API methods Thread.stop, .suspend and .resume. [7] The feature is considered extraneous and will be removed in a planned future version. Early versions of the Web markup language HTML included a FONT element to allow page designers to specify the font in which text should be displayed.