A useful MultiSemaphore

java 代码

public class MultiSemaphore
{
    protected int value;
    public MultiSemaphore(int v) {
        value = v;
    }

    //The P method here takes an integer parameter of how many instances of the
    //semaphore lock have been requested. The method will block until all
    //instances are available.
    public synchronized void P(int no) {
        while ((value - no) < 0) {
            try {
                wait();
            }
            catch (InterruptedException e) { }
        }
        value=value-no;
    }

    // the V method allows the caller to release a number of instances of the
    // semaphore lock
    public synchronized void V(int no ) {
       value=value+no;
       notify();
    }
}

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A simple thread pool implementation | 多线程同步与互斥

• 2007-03-07 11:50
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1 楼 spainsherry 2007-03-14  

革命尚未成功，同志仍需努力