TD2 question I.4

Create userthread.cc content and call it from exception.cc

code/userprog/exception.cc

@@ -25,6 +25,10 @@
 #include "system.h"
 #include "syscall.h"
 
+#ifdef CHANGED
+#include "userthread.h"
+#endif
+
 //----------------------------------------------------------------------
 // UpdatePC : Increments the Program Counter register in order to resume
 // the user program immediately after the "syscall" instruction.
@@ -210,6 +214,9 @@ ExceptionHandler (ExceptionType which)
           }
         case SC_ThreadCreate:
           {
+            int f = machine->ReadRegister(4);
+            int args = machine->ReadRegister(5);
+            do_ThreadCreate(f, args);
             break;
           }
         case SC_ThreadExit:

code/userprog/userthread.cc

@@ -0,0 +1,13 @@
+#ifdef CHANGED
+#include "copyright.h"
+#include "system.h"
+#include "userthread.h"
+#include "syscall.h"
+
+int do_ThreadCreate(int f, int arg){
+    DEBUG('x',"Enter do_ThreadCreate function\n");
+}
+
+void do_ThreadExit(){
+}
+#endif

code/userprog/userthread.h

@@ -0,0 +1,7 @@
+#ifdef CHANGED
+#include "copyright.h"
+#include "utility.h"
+
+extern int do_ThreadCreate(int f, int arg);
+extern void do_ThreadExit();
+#endif