1 files changed, 78 insertions, 0 deletions
diff --git a/libc/sysdeps/mach/powerpc/machine-lock.h b/libc/sysdeps/mach/powerpc/machine-lock.h
new file mode 100644
index 000000000..cba6b0a6e
--- /dev/null
+++ b/libc/sysdeps/mach/powerpc/machine-lock.h
@@ -0,0 +1,78 @@
+/* Machine-specific definition for spin locks.  PowerPC version.
+   Copyright (C) 1994,97,2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _MACHINE_LOCK_H
+#define	_MACHINE_LOCK_H
+
+/* The type of a spin lock variable.  */
+
+typedef __volatile long int __spin_lock_t;
+
+/* Value to initialize `__spin_lock_t' variables to.  */
+
+#define	__SPIN_LOCK_INITIALIZER	0L
+
+
+#ifndef _EXTERN_INLINE
+#define _EXTERN_INLINE extern __inline
+#endif
+
+/* Unlock LOCK.  */
+
+_EXTERN_INLINE void
+__spin_unlock (__spin_lock_t *__lock)
+{
+  long int __locked;
+  __asm__ __volatile__ ("\
+0:	lwarx	%0,0,%1\n\
+	stwcx.	%2,0,%1\n\
+	bne-	0b\n\
+" : "=&r" (__locked) : "r" (__lock), "r" (0) : "cr0");
+}
+
+/* Try to lock LOCK; return nonzero if we locked it, zero if another has.  */
+
+_EXTERN_INLINE int
+__spin_try_lock (register __spin_lock_t *__lock)
+{
+  long int __rtn;
+  __asm__ __volatile__ ("\
+0:	lwarx	%0,0,%1\n\
+	stwcx.	%2,0,%1\n\
+	bne-	0b\n\
+" : "=&r" (__rtn) : "r" (__lock), "r" (1) : "cr0");
+  return !__rtn;
+}
+
+/* Return nonzero if LOCK is locked.  */
+
+_EXTERN_INLINE int
+__spin_lock_locked (__spin_lock_t *__lock)
+{
+  long int __rtn;
+  __asm__ __volatile__ ("\
+0:	lwarx	%0,0,%1\n\
+	stwcx.	%0,0,%1\n\
+	bne-	0b\n\
+" : "=&r" (__rtn) : "r" (__lock) : "cr0");
+  return __rtn;
+}
+
+
+#endif /* machine-lock.h */