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import {
SynStart,
SynEnd,
wait,
notify,
SharedBoolean,
SharedString,
SharedNumber,
Syc,
isMainThread,
addFunc,
Runnable,
Thread,
} from './ThreadBridge';
export function sharedWash(runnable: Runnable) {
let archetype: Runnable;
if (runnable.className === 'Reader') {
archetype = new Reader(
(runnable as Reader).semaphores,
(runnable as Reader).rank.getValue()
);
} else if (runnable.className === 'Writer') {
archetype = new Writer(
(runnable as Writer).semaphores,
(runnable as Writer).rank.getValue()
);
} else {
archetype = new Thread();
}
addFunc(runnable, archetype);
runnable.run();
}
export class ReadWrite {
public syn: Syc = new Syc();
public static staticSyn: Syc = new Syc();
public className: string = 'ReadWrite';
public static main(args: string[]): void {
const semaphores = new Semaphores();
const thread0 = new Thread(new Reader(semaphores, 0));
const thread1 = new Thread(new Reader(semaphores, 1));
const thread2 = new Thread(new Reader(semaphores, 2));
const thread3 = new Thread(new Writer(semaphores, 3));
const thread4 = new Thread(new Writer(semaphores, 4));
thread0.start();
thread1.start();
thread2.start();
thread3.start();
thread4.start();
}
}
class Semaphores extends Syc {
public count = new SharedNumber();
public rw = new SharedBoolean(true);
public w = new SharedBoolean(true);
public mutex = new SharedBoolean(true);
constructor() {
super();
this.count.setValue(0);
this.rw.setValue(true);
this.w.setValue(true);
this.mutex.setValue(true);
}
public Pw(): boolean {
SynStart(this);
if (this.w.getValue()) {
this.w.setValue(false);
SynEnd(this);
return true;
} else {
SynEnd(this);
return false;
}
}
public Pmutex(): boolean {
SynStart(this);
if (this.mutex.getValue()) {
this.mutex.setValue(false);
SynEnd(this);
return true;
} else {
SynEnd(this);
return false;
}
}
public Prw(): boolean {
SynStart(this);
if (this.rw.getValue()) {
this.rw.setValue(false);
SynEnd(this);
return true;
} else {
SynEnd(this);
return false;
}
}
public Vmutex(): void {
SynStart(this);
this.mutex.setValue(true);
SynEnd(this);
}
public Vw(): void {
SynStart(this);
this.w.setValue(true);
SynEnd(this);
}
public Vrw(): void {
SynStart(this);
this.rw.setValue(true);
SynEnd(this);
}
}
class Reader implements Runnable {
public semaphores: Semaphores;
public rank = new SharedNumber();
public syn: Syc = new Syc();
public static staticSyn: Syc = new Syc();
public className: string = 'Reader';
constructor(semaphores: Semaphores, rank: number) {
this.semaphores = semaphores;
this.rank.setValue(rank);
}
public run(): void {
while (true) {
while (!this.semaphores.Pw()) {}
while (!this.semaphores.Pmutex()) {}
if (this.semaphores.count.getValue() === 0) {
while (!this.semaphores.Prw()) {}
}
this.semaphores.count.setValue(this.semaphores.count.getValue() + 1);
this.semaphores.Vmutex();
this.semaphores.Vw();
console.log(`Thread ${this.rank.getValue()} is reading.`);
while (!this.semaphores.Pmutex()) {}
this.semaphores.count.setValue(this.semaphores.count.getValue() - 1);
if (this.semaphores.count.getValue() === 0) {
this.semaphores.Vrw();
}
this.semaphores.Vmutex();
}
}
}
class Writer implements Runnable {
public semaphores: Semaphores;
public rank = new SharedNumber();
public syn: Syc = new Syc();
public static staticSyn: Syc = new Syc();
public className: string = 'Writer';
constructor(semaphores: Semaphores, rank: number) {
this.semaphores = semaphores;
this.rank.setValue(rank);
}
run(): void {
while (true) {
while (!this.semaphores.Pw()) {}
while (!this.semaphores.Prw()) {}
console.log(`Thread ${this.rank.getValue()} is writing.`);
this.semaphores.Vrw();
this.semaphores.Vw();
}
}
}
if (isMainThread()) {
// You can put the entry of your code here to test.
}