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/*************************************************
*
* = PACKAGE
* tests.Concurrency
*
* = FILENAME
* SemaphoreTest.java
*
*@author Prashant Jain
*
*************************************************/
package tests.Concurrency;
import java.io.*;
import JACE.OS.*;
import JACE.Concurrency.*;
class SemaphoreWriter extends Thread
{
SemaphoreWriter (int nIterations, Semaphore s)
{
this.nIterations_ = nIterations;
this.s_ = s;
}
public void run ()
{
for (int i = 1; i <= this.nIterations_; i++)
{
// Acquire the semaphore (will block until it gets it)
try
{
this.s_.acquire ();
}
catch (InterruptedException e)
{
ACE.ERROR (e);
}
SemaphoreTest.counter++;
ACE.DEBUG (Thread.currentThread ().toString () +
" acquired semaphore in iteration " + i +
", counter = " + SemaphoreTest.counter);
try
{
Thread.sleep (1);
}
catch (InterruptedException e)
{
}
// Release the semaphore
this.s_.release ();
ACE.DEBUG (Thread.currentThread ().toString () +
" released semaphore in iteration " + i);
try
{
Thread.sleep (1);
}
catch (InterruptedException e)
{
}
}
}
int nIterations_;
Semaphore s_;
}
public class SemaphoreTest
{
public static void main (String args[])
{
int nThreads = 1;
int count = 1;
int nIterations = 100;
int i;
try
{
if (args.length == 3)
{
nThreads = Integer.parseInt (args[0]);
count = Integer.parseInt (args[1]);
nIterations = Integer.parseInt (args[2]);
}
}
catch (NumberFormatException e)
{
ACE.ERROR ("Illegal argument.");
}
// Create a lock
Semaphore s = new Semaphore (count);
// Spawn off n_threads
for (i = 0; i < nThreads; i++)
new SemaphoreWriter (nIterations, s).start ();
}
public static int counter;
}
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