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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /mach/lock-intern.h
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initial import
Diffstat (limited to 'mach/lock-intern.h')
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diff --git a/mach/lock-intern.h b/mach/lock-intern.h
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+/* 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 */