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diff --git a/test/geekos_test_vm/include/geekos/synch.h b/test/geekos_test_vm/include/geekos/synch.h
new file mode 100644
index 0000000..5cb95ef
--- /dev/null
+++ b/test/geekos_test_vm/include/geekos/synch.h
@@ -0,0 +1,44 @@
+/*
+ * Synchronization primitives
+ * Copyright (c) 2001, David H. Hovemeyer <daveho@cs.umd.edu>
+ * $Revision: 1.1 $
+ * 
+ * This is free software.  You are permitted to use,
+ * redistribute, and modify it as specified in the file "COPYING".
+ */
+
+#ifndef GEEKOS_SYNCH_H
+#define GEEKOS_SYNCH_H
+
+#include <geekos/kthread.h>
+
+/*
+ * mutex states
+ */
+enum { MUTEX_UNLOCKED, MUTEX_LOCKED };
+
+struct Mutex {
+    int state;
+    struct Kernel_Thread* owner;
+    struct Thread_Queue waitQueue;
+};
+
+#define MUTEX_INITIALIZER { MUTEX_UNLOCKED, 0, THREAD_QUEUE_INITIALIZER }
+
+struct Condition {
+    struct Thread_Queue waitQueue;
+};
+
+void Mutex_Init(struct Mutex* mutex);
+void Mutex_Lock(struct Mutex* mutex);
+void Mutex_Unlock(struct Mutex* mutex);
+
+void Cond_Init(struct Condition* cond);
+void Cond_Wait(struct Condition* cond, struct Mutex* mutex);
+void Cond_Signal(struct Condition* cond);
+void Cond_Broadcast(struct Condition* cond);
+
+#define IS_HELD(mutex) \
+    ((mutex)->state == MUTEX_LOCKED && (mutex)->owner == g_currentThread)
+
+#endif  /* GEEKOS_SYNCH_H */