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Interrupt a Thread Set and Obtain a Thread s Priority Monitor a Thread s State Use a Thread Group
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NOTE A relatively recent addition to the Java API are the concurrency utilities, which are
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packaged in javautilconcurrent and its subpackages These are also commonly referred to as the concurrent API Added by Java 5, the concurrent API supplies several high-level constructs that aid in the development of highly sophisticated, multithreaded programs For example, the concurrent API supplies semaphores, countdown latches, and futures, to name a few Although the concurrency utilities are not the focus of this chapter, they are something that will be of interest to readers who are developing thread-intensive applications
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Multithreading Fundamentals
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At its core, multithreading is a form of multitasking There are two distinct types of multitasking: process-based and thread-based It is important to differentiate between the two As it relates to this discussion, a process is, in essence, a program that is executing Thus, process-based multitasking is the feature that allows your computer to run two or more programs concurrently For example, it is process-based multitasking that allows you to download a file at the same time you are compiling a program or sorting a database In process-based multitasking, a program is the smallest unit of code that can be dispatched by the scheduler In a thread-based multitasking environment, the thread is the smallest unit of dispatchable code Because a program can contain more than one thread, a single program can use multiple threads to perform two or more tasks at once For instance, a browser can begin rendering a Web page while it is still downloading the remainder of the page This is possible because each action is performed by a separate thread Although Java programs make use of processbased multitasking environments, process-based multitasking is not under the direct control of Java Multithreaded multitasking is All processes have at least one thread of execution, which is called the main thread, because it is the one that is executed when a program begins From the main thread, you can create other threads These other threads can also create threads, and so on Multithreading is important to Java for two main reasons First, multithreading enables you to write very efficient programs because it lets you utilize the idle time that is present in most programs Most I/O devices, whether they be network ports, disk drives, or the keyboard, are much slower than the CPU Thus, a program will often spend a majority of its execution time waiting to send or receive information to or from a device By using multithreading, your program can execute another task during this idle time For example, while one part of your program is sending a file over the Internet, another part can be handling user interaction (such as mouse clicks or button presses), and still another can be buffering the next block of data to send The second reason that multithreading is important to Java relates to Java s eventhandling model A program (such as an applet) must respond quickly to an event and then return An event handler must not retain control of the CPU for an extended period of time
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Multithreading
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If it does, other events will not be handled in a timely fashion This will make an application appear sluggish It is also possible that an event will be missed Therefore, if an event requires some extended action, then it must be performed by a separate thread A thread can be in one of several states It can be running It can be ready to run as soon as it gets CPU time A running thread can be suspended, which is a temporary halt to its execution It can later be resumed A thread can be blocked when waiting for a resource A thread can be terminated, in which case its execution ends and cannot be resumed Along with thread-based multitasking comes the need for synchronization, which allows the execution of threads to be coordinated in certain well-defined ways Java has extensive, integrated support for synchronization, which is achieved through the use of a monitor, which all objects have, and the synchronized keyword Thus, all objects can be synchronized Two or more threads can communicate with each other through methods that are defined by Object These methods are wait( ), notify( ), and notifyAll( ) They enable one thread to wait on another For example, if one thread is using a shared resource, then another thread must wait until the first thread has finished The waiting thread can resume execution when the first thread notifies it that the resource is now available There are two basic types of threads: user and daemon A user thread is the type of thread created by default For example, the main thread is a user thread In general, a program continues to execute as long as there is at least one active user thread It is possible to change the status of a thread to daemon Daemon threads are automatically terminated when all nondaemon threads have terminated Thus, they are subordinate to user threads Threads can be part of a group A thread group enables you to manage related threads collectively For example, you can obtain an array of the threads in the group Java s multithreading system is built upon the Thread class and its companion interface, Runnable Thread encapsulates a thread of execution To create a new thread, your program will either implement the Runnable interface or extend Thread Both Runnable and Thread are packaged in javalang Thus, they are automatically available to all programs
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