Index: jdi/org/eclipse/jdi/internal/MirrorImpl.java
===================================================================
RCS file: /home/eclipse/org.eclipse.jdt.debug/jdi/org/eclipse/jdi/internal/MirrorImpl.java,v
retrieving revision 1.13
diff -u -r1.13 MirrorImpl.java
--- jdi/org/eclipse/jdi/internal/MirrorImpl.java	6 Apr 2005 21:10:47 -0000	1.13
+++ jdi/org/eclipse/jdi/internal/MirrorImpl.java	23 Jun 2005 13:19:32 -0000
@@ -167,21 +167,22 @@
 	public JdwpReplyPacket requestVM(int command, byte[] outData) {
 		JdwpCommandPacket commandPacket = new JdwpCommandPacket(command);
 		commandPacket.setData(outData);
-		fVirtualMachineImpl.packetSendManager().sendPacket(commandPacket);
-		fPendingJdwpRequest = true;
-		writeVerboseCommandPacketHeader(commandPacket);
-
-		JdwpReplyPacket reply = fVirtualMachineImpl.packetReceiveManager().getReply(commandPacket);
-		if (fVerboseWriter != null) {
-			fVerboseWriter.println();
-			fVerboseWriter.println("Received reply"); //$NON-NLS-1$
-			fVerboseWriter.println("length", reply.getLength()); //$NON-NLS-1$
-			fVerboseWriter.println("id", reply.getId()); //$NON-NLS-1$
-			fVerboseWriter.println("flags", reply.getFlags(), JdwpPacket.getFlagMap()); //$NON-NLS-1$
-			fVerboseWriter.println("error code", reply.errorCode(), JdwpReplyPacket.errorMap()); //$NON-NLS-1$
+		synchronized (fVirtualMachineImpl.getCommunicationLock()) {
+			fVirtualMachineImpl.packetSendManager().sendPacket(commandPacket);
+			fPendingJdwpRequest = true;
+			writeVerboseCommandPacketHeader(commandPacket);
+
+			JdwpReplyPacket reply = fVirtualMachineImpl.packetReceiveManager().getReply(commandPacket);
+			if (fVerboseWriter != null) {
+				fVerboseWriter.println();
+				fVerboseWriter.println("Received reply"); //$NON-NLS-1$
+				fVerboseWriter.println("length", reply.getLength()); //$NON-NLS-1$
+				fVerboseWriter.println("id", reply.getId()); //$NON-NLS-1$
+				fVerboseWriter.println("flags", reply.getFlags(), JdwpPacket.getFlagMap()); //$NON-NLS-1$
+				fVerboseWriter.println("error code", reply.errorCode(), JdwpReplyPacket.errorMap()); //$NON-NLS-1$
+			}
+			return reply;
 		}
-		
-		return reply;
 	}
 	
 	/**
Index: jdi/org/eclipse/jdi/internal/VirtualMachineImpl.java
===================================================================
RCS file: /home/eclipse/org.eclipse.jdt.debug/jdi/org/eclipse/jdi/internal/VirtualMachineImpl.java,v
retrieving revision 1.33
diff -u -r1.33 VirtualMachineImpl.java
--- jdi/org/eclipse/jdi/internal/VirtualMachineImpl.java	19 Apr 2005 21:01:24 -0000	1.33
+++ jdi/org/eclipse/jdi/internal/VirtualMachineImpl.java	23 Jun 2005 13:19:33 -0000
@@ -73,6 +73,9 @@
 	
 	/** Timeout value for requests to VM if not overriden for a particular VM. */
 	private int fRequestTimeout;
+	/** Lock used to synchronize communication with target VM */
+	private Object fCommunicationLock = new Object();
+	
 	/** Mapping of command codes to strings. */
 	
 	private static Map fgHCRResultMap = null;
@@ -1322,5 +1325,16 @@
 	public boolean canBeModified() {
 		return true;
 	}
+	
+	/**
+	 * Returns the lock object used to synchronize communication
+	 * with the target VM.
+	 * 
+	 * @return the lock object used to synchronize communication
+	 * with the target VM
+	 */
+	public Object getCommunicationLock() {
+		return fCommunicationLock;
+	}
 
 }