來至《java多線程設計模式》

自己提供一個邏輯鎖代替JDK的物理鎖synchronized

優點：1.對read操作不進行共享互斥，可以進行多個read操作，提高系統性能

??????? 2.適合read》write的情況

package Sample;public final class ReadWriteLock {private int readingReaders = 0; // (A)...實際正在讀取的執行緒數量private int waitingWriters = 0; // (B)...正在等待寫入的執行緒數量private int writingWriters = 0; // (C)...實際正在寫入的執行緒數量private boolean preferWriter = true; // 寫入優先的話，值為truepublic synchronized void readLock() throws InterruptedException {while (writingWriters > 0 || (preferWriter && waitingWriters > 0)) {wait();}readingReaders++;                       //  (A)實際正在讀取的線程數量加1}public synchronized void readUnlock() {readingReaders--;                       //  (A)實際正在讀取的線程數量減1preferWriter = true;  //read處理后優先處理writenotifyAll();}public synchronized void writeLock() throws InterruptedException {waitingWriters++;                       // (B)正在等待寫入的線程數量加1try {while (readingReaders > 0 || writingWriters > 0) {wait();}} finally {waitingWriters--;                   // (B)正在等待寫入的線程數量減1}writingWriters++;                       //  (C)實際正在寫入的線程數量加1}public synchronized void writeUnlock() {writingWriters--;                       // (C)實際正在寫入的線程數量減preferWriter = false;  //write處理后優先處理readnotifyAll();}
}

轉載于:https://www.cnblogs.com/cxccbv/archive/2009/05/08/1452927.html

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