JAVA WORKTIME RUNTIME PC
JAVA WORKTIME RUNTIME WINDOWS

Another thing to note, If the execution is native Method, that pc The counter records undefined Address, Only execution is Java The program counter records the address of the next instruction. So how do you know where the program was executed before ？ In fact, the program counter is to record that the thread gives up CPU The execution address of, When the time slice is allocated again, the thread can continue to execute from the address specified by its own private counter. So why design program counters to be thread private ？ As mentioned earlier, threads occupy CPU The basic unit of implementation, and CPU Generally, time slice rotation is used to make thread polling occupy, So the current thread CPU After the time slice is used up, Get out of the way CPU, Wait until your next turn. Ī program counter is an area of memory, It is used to record the address of the instruction to be executed by the thread. The relationship between process and thread is as follows ： There are multiple threads in a process, Multiple threads share the heap and method area resources of the process, But each thread has its own program counter and stack area. Concurrent operations can also be implemented by multithreading, Each request is assigned a thread to process.

Thread by CPU Independent scheduling execution, In a multiple CPU Allow multiple threads to run at the same time in the environment. So the system is in production ⽣⼀ Threads, Or switch between threads ⼯ Working time, The burden is ⽐ process ⼩ Much more, That's why, Threads are also known as Lightweight process. Each thread has its own ⾃⼰ The program counter of 、 Virtual machine stack and local ⽅ Dharma stack. Ī process can be composed of many threads, Sharing all resources of a process between threads （ Heaps and ⽅ District resources ）. Thread is the smallest unit of program execution, It is an execution flow of a process, yes CPU Basic unit of dispatch and dispatch. Of the task manager ⽅ type, We can see clearly window At present, we are in good luck ⾏ The process of （.exe ⽂ Shipment of parts ⾏）.

JAVA WORKTIME RUNTIME WINDOWS

Īs shown in the figure below, stay windows By viewing the. Stay Java in, When we start main Function is actually started ⼀ individual JVM The process of ,⽽ main The thread in which the function is located is in this process ⼀ Threads, Also known as the main thread. The system runs ⾏⼀ The first program is ⼀ A process is created from, shipment ⾏ To the process of extinction. Processes are procedural ⼀ Secondary execution ⾏ The process, So the process is dynamic. When the process scheduler selects it, it assigns CPU Time, The program starts to actually run. The system will create a process when the program is running, And allocate resources for it, Then put the process in the process ready queue ） Assigned base unit, It is an instance of the execution of a program. Concurrent programming thread Foundation （ Part 1 ）Ĭoncurrent programming thread Foundation （ Part 1 ）Ĭoncurrent programming thread Foundation （ The next part ）Ī program is a file containing instructions and data, Stored in a disk or other data storage device, That is to say, the program is static code.

1.11.3 ThreadLocal Inheritance is not supportedġ.

1.11.2 hreadLocal Implementation principle of.

1.6 Give up CPU Of executive power yield Method.

1.4 Waiting for thread execution to terminate join Method.

1.3.3 wait(long timeout, int nanos) function.

1.2.2 Realization Runnable Interface run Methods and methods.1.2.1 Inherit Thread Class implementation.

Concurrent programming thread Foundation （ Part 1 ）

Java worktime runtime