# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1318472555 -10800
# Node ID c7bd6ec7b946aa232bd13566bc2844306892996d
# Parent  219974492c7d966b7b6c13e3e89d7815d448d4b7
changed test_proc to modify memory after the fork in order to try out copy-on-write,
by pushing the result of getpid on the stack.

diff -r 219974492c7d -r c7bd6ec7b946 src/test_proc.S
--- a/src/test_proc.S	Wed Oct 12 14:46:00 2011 +0300
+++ b/src/test_proc.S	Thu Oct 13 05:22:35 2011 +0300
@@ -8,6 +8,12 @@
 	movl $SYS_FORK, %eax
 	int $SYSCALL_INT
 
+	/* test copy-on-write by pushing the pid to the stack
+	 * then use this value from the stack times 2 as a sleep
+     * interval in the loop.
+	 */
+	movl $SYS_GETPID, %eax
+	int $SYSCALL_INT
 	push %eax
 
 infloop:
@@ -15,20 +21,14 @@
 	movl $SYS_HELLO, %eax
 	int $SYSCALL_INT
 
-	/* --- call getpid ---
-	 * we'll use the process id, multiplied by two as a
-	 * sleep interval, to avoid having the two test processes
-	 * sleep for identical amounts of time.
-	 */
-	movl $SYS_GETPID, %eax
-	int $SYSCALL_INT
-	movl %eax, %ebx
-	shl $1, %ebx
 
 	/* --- sleep for (pid * 2) seconds --- 
-	 * ebx (the argument to sleep) already contains the
-	 * correct value
+	 * grab the pid from the stack and shift it left to
+	 * multiply the pid by 2. Then use that as a sleep interval
+	 * in seconds.
 	 */
+	movl (%esp), %ebx
+	shl $1, %ebx
 	movl $SYS_SLEEP, %eax
 	int $SYSCALL_INT