RUNNABLE TIMED_WAITING in Java

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638 TIMED_WAITING RUNNABLE RUNNABLE TERMINATED
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CHAPTER 13: THREADS
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Thread Priorities
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Threads are assigned priorities that the thread scheduler can use to determine how the threads will be scheduled The thread scheduler can use thread priorities to determine which thread gets to run The thread scheduler favors giving CPU time to the thread with the highest priority in the Ready-to-run state This is not necessarily the thread that has been the longest time in the Ready-to-run state Heavy reliance on thread priorities for the behavior of a program can make the program unportable across platforms, as thread scheduling is host platform dependent Priorities are integer values from 1 (lowest priority given by the constant Thread MIN_PRIORITY) to 10 (highest priority given by the constant ThreadMAX_PRIORITY) The default priority is 5 (ThreadNORM_PRIORITY) A thread inherits the priority of its parent thread The priority of a thread can be set using the setPriority() method and read using the getPriority() method, both of which are defined in the Thread class The following code sets the priority of the thread myThread to the minimum of two values: maximum priority and current priority incremented to the next level:
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myThreadsetPriority(Mathmin(ThreadMAX_PRIORITY, myThreadgetPriority()+1));
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The setPriority() method is an advisory method, meaning that it provides a hint from the program to the JVM, which the JVM is in no way obliged to honor The method can be used to fine-tune the performance of the program, but should not be relied upon for the correctness of the program
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Thread Scheduler
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Schedulers in JVM implementations usually employ one of the two following strategies: Preemptive scheduling If a thread with a higher priority than the current running thread moves to the Ready-to-run state, the current running thread can be preempted (moved to the Ready-to-run state) to let the higher priority thread execute Time-Sliced or Round-Robin scheduling A running thread is allowed to execute for a fixed length of time, after which it moves to the Ready-to-run state to await its turn to run again
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136: THREAD TRANSITIONS
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It should be emphasised that thread schedulers are implementation- and platformdependent; therefore, how threads will be scheduled is unpredictable, at least from platform to platform
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Running and Yielding
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After its start() method has been called, the thread starts life in the Ready-to-run state Once in the Ready-to-run state, the thread is eligible for running, ie, it waits for its turn to get CPU time The thread scheduler decides which thread runs and for how long Figure 134 illustrates the transitions between the Ready-to-Run and Running states A call to the static method yield(), defined in the Thread class, may cause the current thread in the Running state to transit to the Ready-to-run state, thus relinquishing the CPU If this happens, the thread is then at the mercy of the thread scheduler as to when it will run again It is possible that if there are no threads in the Ready-to-run state, this thread can continue executing If there are other threads in the Ready-to-run state, their priorities can influence which thread gets to execute As with the setPriority() method, the yield() method is also an advisory method, and therefore comes with no guarantees that the JVM will carry out the call s bidding A call to the yield() method does not affect any locks that the thread might hold
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Running and Yielding
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Ready-to-Run Scheduling yield() Running
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By calling the static method yield(), the running thread gives other threads in the Ready-to-run state a chance to run A typical example where this can be useful is when a user has given some command to start a CPU-intensive computation, and has the option of cancelling it by clicking on a CANCEL button If the computation thread hogs the CPU and the user clicks the CANCEL button, chances are that it might take a while before the thread monitoring the user input gets a chance to run and take appropriate action to stop the computation A thread running such a computation should do the computation in increments, yielding between increments to allow other threads to run This is illustrated by the following run() method:
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public void run() { try { while (!done()) { doLittleBitMore(); Threadyield(); }
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