Initial version

code/threads/threadtest.cc

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+// threadtest.cc 
+//      Simple test case for the threads assignment.
+//
+//      Create two threads, and have them context switch
+//      back and forth between themselves by calling Thread::Yield, 
+//      to illustratethe inner workings of the thread system.
+//
+// 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"
+
+//----------------------------------------------------------------------
+// SimpleThread
+//      Loop 10 times, yielding the CPU to another ready thread 
+//      each iteration.
+//
+//      "which" is simply a number identifying the thread, for debugging
+//      purposes.
+//----------------------------------------------------------------------
+
+void
+SimpleThread (void *arg)
+{
+    int which = (long) arg;
+    int num;
+
+    for (num = 0; num < 10; num++)
+      {
+	  printf ("*** thread %d looped %d times\n", which, num);
+	  currentThread->Yield ();
+      }
+}
+
+//----------------------------------------------------------------------
+// ThreadTest
+//      Set up a ping-pong between two threads, by forking a thread 
+//      to call SimpleThread, and then calling SimpleThread ourselves.
+//----------------------------------------------------------------------
+
+void
+ThreadTest ()
+{
+    DEBUG ('t', "Entering SimpleTest\n");
+
+    Thread *t = new Thread ("forked thread");
+
+    t->Start (SimpleThread, (void*) 1);
+    SimpleThread (0);
+}