Index: include/cpu.h
===================================================================
--- include/cpu.h	(revision a8f9a8291c201ef23ba4a707a7a7ceacc7c60ae1)
+++ include/cpu.h	(revision 6e787c41b47a6c433353188327c83128dc6ad05a)
@@ -41,5 +41,5 @@
 #include <arch/context.h>
 
-#define CPU_STACK_SIZE	(4096)
+#define CPU_STACK_SIZE	PAGE_SIZE
 
 struct cpu {
Index: include/preemption.h
===================================================================
--- include/preemption.h	(revision 6e787c41b47a6c433353188327c83128dc6ad05a)
+++ include/preemption.h	(revision 6e787c41b47a6c433353188327c83128dc6ad05a)
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2005 Jakub Jermar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __PREEMPTION_H__
+#define __PREEMPTION_H__
+
+extern void preemption_disable(void);
+extern void preemption_enable(void);
+
+#endif
Index: src/Makefile
===================================================================
--- src/Makefile	(revision a8f9a8291c201ef23ba4a707a7a7ceacc7c60ae1)
+++ src/Makefile	(revision 6e787c41b47a6c433353188327c83128dc6ad05a)
@@ -21,4 +21,5 @@
 	time/timeout.c \
 	time/delay.c \
+	preempt/preemption.c \
 	synch/spinlock.c \
 	synch/condvar.c \
Index: src/preempt/preemption.c
===================================================================
--- src/preempt/preemption.c	(revision 6e787c41b47a6c433353188327c83128dc6ad05a)
+++ src/preempt/preemption.c	(revision 6e787c41b47a6c433353188327c83128dc6ad05a)
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2005 Jakub Jermar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <preemption.h>
+#include <arch.h>
+#include <arch/atomic.h>
+#include <arch/barrier.h>
+
+void preemption_disable(void)
+{
+}
+
+void preemption_enable(void)
+{
+}
Index: test/synch/rwlock3/test.c
===================================================================
--- test/synch/rwlock3/test.c	(revision a8f9a8291c201ef23ba4a707a7a7ceacc7c60ae1)
+++ test/synch/rwlock3/test.c	(revision 6e787c41b47a6c433353188327c83128dc6ad05a)
@@ -41,5 +41,5 @@
 
 static void reader(void *arg);
-static void failed(void *arg);
+static void failed(void);
 
 void reader(void *arg)
Index: test/synch/rwlock4/test.c
===================================================================
--- test/synch/rwlock4/test.c	(revision a8f9a8291c201ef23ba4a707a7a7ceacc7c60ae1)
+++ test/synch/rwlock4/test.c	(revision 6e787c41b47a6c433353188327c83128dc6ad05a)
@@ -60,9 +60,12 @@
 {
 	__u32 rc;
+	pri_t pri;
 
+	pri = cpu_priority_high();
 	spinlock_lock(&lock);	
 	rc = seed % max;
 	seed = (((seed<<2) ^ (seed>>2)) * 487) + rc;
 	spinlock_unlock(&lock);
+	cpu_priority_restore(pri);
 	return rc;
 }