comsem.java

SRI international 发布的OAA框架软件

package com.sri.oaa2.com; 

public class ComSem 
{
  private int allowed = 0;
  private int count = 0;

  public ComSem(int i) 
  {
    allowed = i;
  }

  public ComSem() 
  {
  }

  synchronized public void acquire() 
  {
    try {
      while(allowed <= 0) {
        wait();
      }
    }
    catch(InterruptedException ie) {
    }
    ++count;
    --allowed;
  }

  synchronized public void release() 
  {
    ++allowed;
    notify();
  }

  synchronized public void releaseTo(int i) 
  {
    allowed = i;
    notify();
  }

  synchronized public int snapshot() 
  {
    return allowed;
  }
}