Chapter 15 Multithreading 841 caller immediately. The caller then executes concurrently with the launched thread. The start method throws an IllegalThreadStateException if the thread it is trying to start has already been started. The static method sleep is called with an argument specifying how long the currently executing thread should sleep (in milliseconds); while a thread sleeps, it does not contend for the processor, so other threads can execute. This can give lower priority threads a chance to run. The interrupt method is called to interrupt a thread. The static method interrupted returns true if the current thread has been interrupted and false otherwise. A program can invoke a specific thread s isInterrupted method to determine whether that thread has been interrupted. Method isAlive returns trueif start has been called for a given thread and the thread is not dead (i.e., its controlling run method has not completed execution). Method setName sets a Thread s name. Method getName returns the name of the Thread. Method toString returns a String consisting of the name of the thread, the priority of the thread and the thread s ThreadGroup (discussed in Section 15.11). The static method currentThread returns a reference to the currently executing Thread. Method join waits for the Thread to which the message is sent to die before the calling Thread can proceed; no argument or an argument of 0 milliseconds to method join indicates that the current Thread will wait forever for the target Thread to die before the calling Threadproceeds. Such waiting can be dangerous; it can lead to two particularly serious problems called deadlock and indefinite postponement. We will discuss these momentarily. Testing and Debugging Tip 15.2 Method dumpStack is useful for debugging multithreaded applications. A program calls static method dumpStack to print a method-call stack trace for the current Thread. 15.3 Thread States: Life Cycle of a Thread At any time, a thread is said to be in one of several thread states (illustrated in Fig. 15.1). Let us say that a thread that was just created is in the born state. The thread remains in this state until the program calls the thread s start method, which causes the thread to enter the ready state (also known as the runnable state). The highest priority ready thread enters the running state (i.e., the thread begins executing), when the system assigns a processor to the thread. A thread enters the dead state when its run method completes or terminates for any reason a dead thread eventually will be disposed of by the system. One common way for a running thread to enter the blocked state is when the thread issues an input/output request. In this case, a blocked thread becomes ready when the I/O for which it is waiting completes. A blocked thread cannot use a processor even if one is available. When the program calls method sleep in a running thread, that thread enters the sleeping state. A sleeping thread becomes ready after the designated sleep time expires. A sleeping thread cannot use a processor even if one is available. If the program calls method interrupt on a sleeping thread, that thread exits the sleeping state and becomes ready to execute.
We highly recommend you visit web and email hosting services if you need stable and cheap web hosting platform for your web applications.

[55] Mobile phones were in fact not covered in springsteen ringtones nebraska and and the original researchers have since emphatically disavowed any connection between their research, springsteen ringtones nebraska and s, and CCD, specifically indicating that the Independent article had misinterpreted their results and created “a horror story”.

wolfmother ringtone

In most countries, ringtones mule s outnumber land-line phones, with fixed landlines numbering 1.

This entry was posted on Wednesday, August 29th, 2007 at 4:27 pm and is filed under JBOSS. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.