Big Data-java Foundation -8day

Process

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1. Processes are isolated in memory (memory is not shared).

2. Communication between processes is through the socket, which is also required on the same computer.

Thread

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1. Code blocks that execute concurrently during the execution of the program.

2. Share memory between threads.

3. A process must have at least one thread (the main path).

4.Thread: Thread class.

Start (); Notifies the CPU that the thread can start executing.

Run (); The code block that the thread specifically executes. The method has no return value and no parameters.

Thread t = new thread (); Creates a thread.

T.start (); Run.

5.thread.currentthread (); Gets the currently executing thread.

6.yield (); Discard CPU preemption Rights

7.sleep (int mils); Lets the current thread hibernate for the specified number of milliseconds.

8.join (); Waits for the specified thread to end

9.thread.setdaemon (TRUE); The daemon thread. Must be set before thread start.

10.synchronozed (lock) {...} Synchronize code blocks.

Producers and consumers

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Notify: Randomly notifies a thread in the waiting queue.

Notifyall: Notifies all threads in the waiting queue.

Big Data-java Foundation -8day