Java Implementation PV Operations | The question of the Philosopher's meal

Operation Result:

Java code:

1  Public classMain {2 3      Public Static voidMain (string[] args) {4Global global=NewGlobal ();5         6Philosopher ph[]=NewPhilosopher[5];7         inti;8          for(i=0;i<5;i++){9ph[i]=Newphilosopher (i);Ten         } OneThread[] Ph_t=NewThread[5]; A          for(i=0;i<5;i++){ -ph_t[i]=NewThread (Ph[i]); -         } the          for(i=0;i<5;i++){ - Ph_t[i].start (); -         } -     } + } -  +  A classsyn{//PV Operation class at     intcount=0;//Signal Volume - syn () {} -SynintA) {count=A;} -      Public synchronized voidWait () {//The keyword synchronized guarantees that this operation is a "primitive language" -count--; -         if(count<0) {//equals 0: A process has entered the critical section in             Try{//less than 0:abs (count) = number of blocked processes -                  This. Wait (); to}Catch(interruptedexception e) { + E.printstacktrace ();  -             }   the         }   *     }   $      Public synchronized voidSignal () {//The keyword synchronized guarantees that this operation is a "primitive language"Panax Notoginsengcount++; -         if(count<=0) {//If there is a process blocking the              This. Notify ();// All +         } A     }   the } +  - classglobal{ $     StaticSyn chopsticks[]=NewSyn[5]; $     Static intCount=0; - Global () { -         inti; the          for(i=0;i<5;i++){ -chopsticks[i]=NewSYN (1);//Initialize the semaphoreWuyi         } the     } - } Wu  - classPhilosopherImplementsrunnable{//Philosopher Class About     intId=0; $ philosopher () {} -Philosopher (intID) { -Id=ID; -     } A      Public voidrun () { +          while(true){//global.count<20 the             //pick up left chopsticks - Global.chopsticks[id]. Wait (); $global.chopsticks[(id+1)%5]. Wait (); the              theglobal.count++; theSystem.out.println ("Philosopher" +id+ "picked up chopsticks" +id+ "and Chopsticks" + ((id+1)%5) + "A good meal"); the             Try { -Thread.Sleep (10); in}Catch(interruptedexception e) { the                 //TODO auto-generated Catch block the e.printstacktrace (); About             } the              the Global.chopsticks[id]. Signal (); theglobal.chopsticks[(id+1)%5]. Signal (); +         } -     } the}

Java Implementation PV Operations | The question of the Philosopher's meal