Initial version

code/network/nettest.cc

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+// nettest.cc 
+//	Test out message delivery between two "Nachos" machines,
+//	using the Post Office to coordinate delivery.
+//
+//	Two caveats:
+//	  1. Two copies of Nachos must be running, with machine ID's 0 and 1:
+//		./nachos -m 0 -o 1 &
+//		./nachos -m 1 -o 0 &
+//
+//	  2. You need an implementation of condition variables,
+//	     which is *not* provided as part of the baseline threads 
+//	     implementation.  The Post Office won't work without
+//	     a correct implementation of condition variables.
+//
+// Copyright (c) 1992-1993 The Regents of the University of California.
+// All rights reserved.  See copyright.h for copyright notice and limitation 
+// of liability and disclaimer of warranty provisions.
+
+#include "copyright.h"
+
+#include "system.h"
+#include "network.h"
+#include "post.h"
+#include "interrupt.h"
+
+// Test out message delivery, by doing the following:
+//	1. send a message to the machine with ID "farAddr", at mail box #0
+//	2. wait for the other machine's message to arrive (in our mailbox #0)
+//	3. send an acknowledgment for the other machine's message
+//	4. wait for an acknowledgement from the other machine to our 
+//	    original message
+
+void
+MailTest(int farAddr)
+{
+    PacketHeader outPktHdr, inPktHdr;
+    MailHeader outMailHdr, inMailHdr;
+    const char *data = "Hello there!";
+    const char *ack = "Got it!";
+    char buffer[MaxMailSize];
+
+    // construct packet, mail header for original message
+    // To: destination machine, mailbox 0
+    // From: our machine, reply to: mailbox 1
+    outPktHdr.to = farAddr;		
+    outMailHdr.to = 0;
+    outMailHdr.from = 1;
+    outMailHdr.length = strlen(data) + 1;
+
+    // Send the first message
+    postOffice->Send(outPktHdr, outMailHdr, data); 
+
+    // Wait for the first message from the other machine
+    postOffice->Receive(0, &inPktHdr, &inMailHdr, buffer);
+    printf("Got \"%s\" from %d, box %d\n",buffer,inPktHdr.from,inMailHdr.from);
+    fflush(stdout);
+
+    // Send acknowledgement to the other machine (using "reply to" mailbox
+    // in the message that just arrived
+    outPktHdr.to = inPktHdr.from;
+    outMailHdr.to = inMailHdr.from;
+    outMailHdr.length = strlen(ack) + 1;
+    postOffice->Send(outPktHdr, outMailHdr, ack); 
+
+    // Wait for the ack from the other machine to the first message we sent.
+    postOffice->Receive(1, &inPktHdr, &inMailHdr, buffer);
+    printf("Got \"%s\" from %d, box %d\n",buffer,inPktHdr.from,inMailHdr.from);
+    fflush(stdout);
+
+    // Then we're done!
+    interrupt->Powerdown();
+}