SyncQueue for Disk I/O

Kernel_Disk.java

   Disk disk = new Disk( 1000 );
   SyncQueue ioQueue = new SyncQueue( );
   ...
   ...
   // a disk read operation:
   while ( disk.read( blockId, buffer ) == false ) {
      ioQueue.enqueueAndSleep( 1 ); // relinquish CPU to another ready thread
      // now check to ensure disk is not busy
      while ( disk.testAndResetReady( ) == false )
         ioQueue.enqueueAndSleep( 2 ); // relinquish CPU to another ready thread
   }
   // now you can access data in buffer