Java threading and concurrent programming practices----Synchronizer (Phaser)

The phaser is a more resilient synchronization barrier. As with the sync barrier, a phaser allows a group of threads to

The barrier waits until the last thread arrives and the threads continue to execute. Phaser also offers and barrier

Action-equivalent operation.

Unlike synchronization barriers, which have a fixed number of threads, a phaser can coordinate an indefinite number of threads, which

Threads can be registered at any time.

Example code:

The following example creates 3 threads, prints a few letters, but does not execute immediately after the thread is created, but in the main program

Control it, 3 seconds after all processes start executing simultaneously

import java.util.concurrent.phaser;public class mytest {public static void  Main (String[] args)  {phaser phaser = new phaser (3)  {//  a total of 3 worker threads, So assign a value of 3@overrideprotected boolean onadvance (Int phase, int registeredparties) in the constructor  {system.out.println ("\n========= Gorgeous split Line =============");return registeredparties == 0;}}; SYSTEM.OUT.PRINTLN ("program starts execution");char a =  ' a ';for  (int i = 0; i <  3; i++)  { //  Create and start 3 threads new mythread ((char)   (a + i),  phaser). Start ();} while  (!phaser.isterminated ())  {//  as long as Phaser does not end, the main thread loops to wait for Thread.yield ();} System.out.println ("End of Program");}} class mythread extends thread {private char c;private phaser phaser; Public mythread (Char c, phaser phaser)  {this.c = c;this.phaser =  Phaser;} @OVerridepublic void run ()  {while  (!phaser.isterminated ())  {for  (int i =  0; i < 10; i++)  { //  Print the current letter 10 times System.out.print (c +  "   ");}   After printing the current letter, update it to the third letter after it, such as B update to E, for the next stage of printing c =  (char)   (c + 3);if  (c >   ' z ')  {//  if the letter Z is exceeded, a thread is dynamically reduced in phaser and exits the loop ends this thread phaser.arriveandderegister ();  else {//  instead, wait for other threads to reach the end of the stage, then go together to the next stage phaser.arriveandawaitadvance ();}}}

Java threading and concurrent programming practices----Synchronizer (Phaser)