src/java/simgrid/msg/Sem.java

   1 /*\r
   2  * $Id$\r
   3  *\r
   4  * Copyright 2006,2007 Martin Quinson, Malek Cherier           \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 package simgrid.msg;\r
  12 \r
  13 public class Sem { \r
  14         private int permits_;\r
  15         \r
  16         public Sem(int i) {\r
  17                 permits_ = i;\r
  18         }\r
  19         \r
  20         public void acquire() throws InterruptedException {\r
  21                 \r
  22                 if (Thread.interrupted()) \r
  23                         throw new InterruptedException();\r
  24                 \r
  25                 synchronized(this) {\r
  26                 \r
  27                         try {\r
  28                                         while (permits_ <= 0) \r
  29                                                 wait();\r
  30                                         \r
  31                                         --permits_;\r
  32                         }\r
  33                         catch (InterruptedException ex) {\r
  34                                 notify();\r
  35                                 throw ex;\r
  36                         }\r
  37                 }\r
  38         }\r
  39 \r
  40         public synchronized void release() {\r
  41                 ++permits_;\r
  42                 notify();\r
  43         }\r
  44 }\r