Libc-320.tar.gz

[apple/libc.git] / pthreads / pthread_spinlock.h

diff --git a/pthreads/pthread_spinlock.h b/pthreads/pthread_spinlock.h
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+/*
+ * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * Copyright 1996 1995 by Open Software Foundation, Inc. 1997 1996 1995 1994 1993 1992 1991  
+ *              All Rights Reserved 
+ *  
+ * Permission to use, copy, modify, and distribute this software and 
+ * its documentation for any purpose and without fee is hereby granted, 
+ * provided that the above copyright notice appears in all copies and 
+ * that both the copyright notice and this permission notice appear in 
+ * supporting documentation. 
+ *  
+ * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
+ * FOR A PARTICULAR PURPOSE. 
+ *  
+ * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 
+ * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 
+ * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 
+ * 
+ */
+/*
+ * MkLinux
+ */
+
+/*
+ * POSIX Threads - IEEE 1003.1c
+ */
+
+#ifndef _POSIX_PTHREAD_SPINLOCK_H
+#define _POSIX_PTHREAD_SPINLOCK_H
+
+#include <mach/mach.h>
+#define __APPLE_API_PRIVATE
+#include <machine/cpu_capabilities.h>
+
+#ifndef __POSIX_LIB__
+#define __POSIX_LIB__
+#endif
+
+#include "pthread_machdep.h"           /* Machine-dependent definitions. */
+
+/* Number of times to spin when the lock is unavailable and we are on a
+   multiprocessor.  On a uniprocessor we yield the processor immediately.  */
+#define        MP_SPIN_TRIES   1000
+extern int _spin_tries;
+extern int __is_threaded;
+
+/* Internal mutex locks for data structures */
+#define TRY_LOCK(v) (!__is_threaded || _spin_lock_try((pthread_lock_t *)&(v)))
+
+/* _DO_SPINLOCK_LOCK() takes a (pthread_lock_t *) */
+#define _DO_SPINLOCK_LOCK(v) _spin_lock(v)
+
+/* _DO_SPINLOCK_UNLOCK() takes a (pthread_lock_t *) */
+#define _DO_SPINLOCK_UNLOCK(v) _spin_unlock(v)
+
+/* LOCK() takes a (pthread_lock_t) */
+#define LOCK(v)                                                                \
+    do {                                                               \
+       if (__is_threaded) {                                            \
+           _DO_SPINLOCK_LOCK((pthread_lock_t *)&(v));                  \
+       }                                                               \
+    } while (0)
+
+/* UNLOCK() takes a (pthread_lock_t) */
+#define UNLOCK(v)                                                      \
+    do {                                                               \
+       if (__is_threaded) {                                            \
+           _DO_SPINLOCK_UNLOCK((pthread_lock_t *)&(v));                \
+       }                                                               \
+    } while (0)
+
+/* Prototypes. */
+
+/* Functions defined in machine-dependent files. */
+extern void _spin_lock(pthread_lock_t *lockp);
+extern int _spin_lock_try(pthread_lock_t *lockp);
+extern void _spin_unlock(pthread_lock_t *lockp);
+
+#endif /* _POSIX_PTHREAD_SPINLOCK_H */