From: Roland McGrath <roland@gnu.org>
Date: Wed, 8 Feb 1995 03:06:52 +0000 (+0000)
Subject: Initial revision
X-Git-Tag: glibc-2.16-ports-before-merge~3958
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=1eae31ac32358223f5f72fa3c881e113962faf02;p=thirdparty%2Fglibc.git

Initial revision
---

diff --git a/sysdeps/mach/hppa/machine-lock.h b/sysdeps/mach/hppa/machine-lock.h
new file mode 100644
index 00000000000..0a178357a35
--- /dev/null
+++ b/sysdeps/mach/hppa/machine-lock.h
@@ -0,0 +1,63 @@
+/* Machine-specific definition for spin locks.  HPPA version.
+Copyright (C) 1995 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#ifndef _MACHINE_LOCK_H
+#define	_MACHINE_LOCK_H
+
+/* The type of a spin lock variable.  */
+
+typedef __volatile int __spin_lock_t __attribute__ ((__aligned__ (16)));
+
+/* Value to initialize `__spin_lock_t' variables to.  */
+
+#define	__SPIN_LOCK_INITIALIZER	-1
+
+
+#ifndef _EXTERN_INLINE
+#define _EXTERN_INLINE extern __inline
+#endif
+
+/* Unlock LOCK.  */
+
+_EXTERN_INLINE void
+__spin_unlock (__spin_lock_t *__lock)
+{
+  *__lock = -1;
+}
+
+/* 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 __result;
+  __asm__ __volatile__ ("ldcws %0, %1" : "=m" (*__lock), "=r" (__result));
+  return __result != 0;
+}
+
+/* Return nonzero if LOCK is locked.  */
+
+_EXTERN_INLINE int
+__spin_lock_locked (__spin_lock_t *__lock)
+{
+  return *__lock == 0;
+}
+
+
+#endif /* machine-lock.h */