Package EDU.oswego.cs.dl.util.concurrent

Examples of EDU.oswego.cs.dl.util.concurrent.FIFOSemaphore.acquire()

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      Thread t1=new Thread("t1") {
         Sync lock=null;

         public void run() {
            try {
               sem.acquire(); // we're first to the semaphore

               // log("waiting on barrier");
               barrier.barrier(); // wait until t2 joins us
               // log("passed barrier");
               lock=s.readLock();
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               log("1st read: value is " + value);
               assertEquals(10, value);
               sem.release(); // give t2 time to make the modification
               TestingUtil.sleepThread(100);

               sem.acquire(); // to read the uncommitted modification by t2
               log("2nd read: value is " + value + "; we should see t2's uncommitted change (20)");
               assertEquals(20, value); // we're seeing the modification by t2 before t2 committed (a.k.a. released the lock)
               sem.release();
               TestingUtil.sleepThread(100);
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               log("2nd read: value is " + value + "; we should see t2's uncommitted change (20)");
               assertEquals(20, value); // we're seeing the modification by t2 before t2 committed (a.k.a. released the lock)
               sem.release();
               TestingUtil.sleepThread(100);

               sem.acquire(); // to read the committed change by t2
               log("3rd read: value is still " + value + "; we should see t2's committed change");
               assertEquals(20, value);
            }
            catch(Throwable ex) {
               t1_ex=ex;
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         public void run() {
            try {
               TestingUtil.sleepThread(100);
               barrier.barrier();
               sem.acquire();
               lock=s.writeLock();
               lock.attempt(TIMEOUT);
               log("changing value from " + value + " to 20");
               value=20;
               sem.release(); // now t1 can read the uncommitted modification
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               log("changing value from " + value + " to 20");
               value=20;
               sem.release(); // now t1 can read the uncommitted modification
               TestingUtil.sleepThread(100);

               sem.acquire(); // to release the lock
               log("committing the TX");
               lock.release();
            }
            catch(Throwable ex) {
               t2_ex=ex;
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