org/simgrid/msg/Sem.java

   1 /*\r
   2  * Simple semaphore implementation, from Doug Lea (public domain)\r
   3  *\r
   4  * Copyright 2006,2007,2010 The SimGrid Team           \r
   5  * All right reserved. \r
   6  *\r
   7  * This program is free software; you can redistribute \r
   8  * it and/or modify it under the terms of the license \r
   9  *(GNU LGPL) which comes with this package. \r
  10  */  \r
  11 \rpackage simgrid.msg;
  12 \r\rpublic class Sem {\r
  13         /******************************************************************/ \r
  14         /* Simple semaphore implementation, from Doug Lea (public domain) */ \r
  15         /******************************************************************/ \r
  16         private int permits_;
  17 \r       public Sem(int i) {\r            permits_ = i;\r  } \r\r    public void acquire() throws InterruptedException {
  18                 if (Thread.interrupted())
  19                         throw new InterruptedException();
  20 \r               synchronized(this) {
  21                         try {
  22                                 while (permits_ <= 0)
  23                                         wait();
  24                                 --permits_;
  25                         }
  26                         catch(InterruptedException ex) {
  27                                 notify();
  28                                 throw ex;
  29                         }
  30                 }
  31         }
  32 \r       public synchronized void release() {
  33                 ++(this.permits_);
  34                 notify();
  35         } \r} \r