1 files changed, 67 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/mach/i386/machine-lock.h b/REORG.TODO/sysdeps/mach/i386/machine-lock.h
new file mode 100644
index 0000000000..540d1a5326
--- /dev/null
+++ b/REORG.TODO/sysdeps/mach/i386/machine-lock.h
@@ -0,0 +1,67 @@
+/* Machine-specific definition for spin locks.  i386 version.
+   Copyright (C) 1994-2017 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _MACHINE_LOCK_H
+#define	_MACHINE_LOCK_H
+
+/* The type of a spin lock variable.  */
+
+typedef volatile int __spin_lock_t;
+
+/* Value to initialize `__spin_lock_t' variables to.  */
+
+#define	__SPIN_LOCK_INITIALIZER	0
+
+
+#ifndef _EXTERN_INLINE
+#define _EXTERN_INLINE __extern_inline
+#endif
+
+/* Unlock LOCK.  */
+
+_EXTERN_INLINE void
+__spin_unlock (__spin_lock_t *__lock)
+{
+   register int __unlocked;
+   __asm__ __volatile ("xchgl %0, %1"
+		       : "=&r" (__unlocked), "=m" (*__lock) : "0" (0)
+		       : "memory");
+}
+
+/* Try to lock LOCK; return nonzero if we locked it, zero if another has.  */
+
+_EXTERN_INLINE int
+__spin_try_lock (__spin_lock_t *__lock)
+{
+  register int __locked;
+  __asm__ __volatile ("xchgl %0, %1"
+		      : "=&r" (__locked), "=m" (*__lock) : "0" (1)
+		      : "memory");
+  return !__locked;
+}
+
+/* Return nonzero if LOCK is locked.  */
+
+_EXTERN_INLINE int
+__spin_lock_locked (__spin_lock_t *__lock)
+{
+  return *__lock != 0;
+}
+
+
+#endif /* machine-lock.h */