From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@gnu.org>
Date: Sat, 18 Feb 1995 01:27:10 +0000
Subject: initial import

---
 mach/lock-intern.h | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 mach/lock-intern.h

(limited to 'mach/lock-intern.h')

diff --git a/mach/lock-intern.h b/mach/lock-intern.h
new file mode 100644
index 0000000000..9c6bab5ae2
--- /dev/null
+++ b/mach/lock-intern.h
@@ -0,0 +1,89 @@
+/* Copyright (C) 1994 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 _LOCK_INTERN_H
+#define	_LOCK_INTERN_H
+
+#include <machine-lock.h>
+
+#ifndef _EXTERN_INLINE
+#define _EXTERN_INLINE extern __inline
+#endif
+
+
+/* Initialize LOCK.  */
+
+_EXTERN_INLINE void
+__spin_lock_init (__spin_lock_t *__lock)
+{
+  *__lock = __SPIN_LOCK_INITIALIZER;
+}
+
+
+/* Lock LOCK, blocking if we can't get it.  */
+extern void __spin_lock_solid (__spin_lock_t *__lock);
+
+/* Lock the spin lock LOCK.  */
+
+_EXTERN_INLINE void
+__spin_lock (__spin_lock_t *__lock)
+{
+  if (! __spin_try_lock (__lock))
+    __spin_lock_solid (__lock);
+}
+
+/* Name space-clean internal interface to mutex locks.  
+
+   Code internal to the C library uses these functions to lock and unlock
+   mutex locks.  These locks are of type `struct mutex', defined in
+   <cthreads.h>.  The functions here are name space-clean.  If the program
+   is linked with the cthreads library, `__mutex_lock_solid' and
+   `__mutex_unlock_solid' will invoke the corresponding cthreads functions
+   to implement real mutex locks.  If not, simple stub versions just use
+   spin locks.  */
+
+
+/* Initialize the newly allocated mutex lock LOCK for further use.  */
+extern void __mutex_init (void *__lock);
+
+/* Lock LOCK, blocking if we can't get it.  */
+extern void __mutex_lock_solid (void *__lock);
+
+/* Finish unlocking LOCK, after the spin lock LOCK->held has already been
+   unlocked.  This function will wake up any thread waiting on LOCK.  */
+extern void __mutex_unlock_solid (void *__lock);
+
+/* Lock the mutex lock LOCK.  */
+
+_EXTERN_INLINE void
+__mutex_lock (void *__lock)
+{
+  if (! __spin_try_lock ((__spin_lock_t *) __lock))
+    __mutex_lock_solid (__lock);
+}
+
+/* Unlock the mutex lock LOCK.  */
+
+_EXTERN_INLINE void
+__mutex_unlock (void *__lock)
+{
+  __spin_unlock ((__spin_lock_t *) __lock);
+  __mutex_unlock_solid (__lock);
+}
+
+#endif /* lock-intern.h */
-- 
cgit 1.4.1