1 files changed, 18 insertions, 0 deletions
diff --git a/lib/libpthread/arch/arm/_atomic_lock.c b/lib/libpthread/arch/arm/_atomic_lock.c
new file mode 100644
index 00000000000..81797dcaa7f
--- /dev/null
+++ b/lib/libpthread/arch/arm/_atomic_lock.c
@@ -0,0 +1,18 @@
+/*	$OpenBSD: _atomic_lock.c,v 1.1 2004/02/09 13:14:34 drahn Exp $	*/
+/*
+ * Atomic lock for powerpc
+ */
+
+#include "spinlock.h"
+
+int
+_atomic_lock(volatile _spinlock_lock_t *lock)
+{
+	_spinlock_lock_t old;
+
+	__asm__("swp %0, %2, [%1]"
+		: "=r" (old), "=r" (lock)
+		: "r" (_SPINLOCK_LOCKED), "1" (lock) );
+
+	return (old != _SPINLOCK_UNLOCKED);
+}