Java Thread
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Java Thread Priorities: Thread Scheduling and Context Switching, Lecture notes of Java Programming
Java thread priorities, which determine how threads are treated in relation to each other. Thread priorities are integers that specify the relative importance of one thread over another. The rules for context switching include voluntary relinquishment and preemption by a higher-priority thread. Threads can voluntarily yield control by sleeping or blocking on I/O, while preemption occurs when a higher-priority thread demands the CPU.
Typology: Lecture notes
2019/2020
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Java Thread
Thread Priorities
- (^) Java assigns to each thread a priority that determines how that thread should be treated with respect to the others.
- (^) Thread priorities are integers that specify the relative priority of one thread to another.
- (^) A thread’s priority is used to decide when to switch from one running thread to the next.
- (^) This is called a context switch.
Thread Priorities
- A thread can voluntarily relinquish control.
- (^) This is done by explicitly yielding,
- (^) sleeping, or
- (^) blocking on pending I/O.
- (^) In this scenario, all other threads are examined, and the highest-priority thread that is ready to run is given the CPU.
Thread Priorities
- A thread can be preempted by a higher-priority thread.
- (^) In this case, a lower-priority thread that does not yield the processor is simply preempted—no matter what it is doing— by a higher-priority thread.
- (^) Basically, as soon as a higher-priority thread wants to run, it does.
- (^) This is called preemptive multitasking
Thread Priorities
- (^) To set a thread’s priority, use the setPriority( ) method, which is a member of Thread.
- (^) This is its general form: final void setPriority(int level)
- (^) Here, level specifies the new priority setting for the calling thread.
- (^) The value of level must be within the range MIN_PRIORITY and MAX_PRIORITY.
- (^) Currently, these values are 1 and 10 , respectively.
- (^) To return a thread to default priority, specify NORM_PRIORITY , which is currently 5.
- (^) These priorities are defined as static final variables within Thread.