Commiting changes for Dhagatest

Makefile

@@ -180,6 +180,7 @@ UPROGS=\
 	$U/_bcachetest\
 	$U/_alloctest\
 	$U/_specialtest\
+	$U/_dhagatest\
 	# $U/_symlinktest\
 
 fs.img: mkfs/mkfs README user/xargstest.sh $(UPROGS)

user/dhagatest.c

@@ -0,0 +1,47 @@
+#include "kernel/types.h"
+#include "kernel/stat.h"
+#include "user/user.h"
+
+
+void *a = 0x0;
+
+void
+threadFunc()
+{
+    a = malloc(sizeof(int));
+
+    if(a == 0x0)
+    {
+        printf("\nTest failed due to malloc error");
+        exit(1);
+    }
+    printf("\nFrom child, modified a to %p", a);
+}
+
+//Stub for testing purposes
+/*int create_thread(void (*f)())
+{
+    f();
+    return 1;
+}*/
+
+int
+main(int argc, char *argv[])
+{   
+  //int tid = create_thread((void *)&threadFunc);
+  int tid = create_thread((uint64)&threadFunc);
+
+  if(tid < 0)
+  {
+      printf("\nTest failed since thread creation failed");
+      exit(1);
+  }
+
+  while(a == 0x0)
+  {
+      continue;
+  }
+
+  printf("\nMain thread sees the change in vaiable a: %p\n", a);
+  exit(0);
+}