+++ /dev/null
-/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
- * 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. The rights granted to you under the License
- * may not be used to create, or enable the creation or redistribution of,
- * unlawful or unlicensed copies of an Apple operating system, or to
- * circumvent, violate, or enable the circumvention or violation of, any
- * terms of an Apple operating system software license agreement.
- *
- * 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_OSREFERENCE_LICENSE_HEADER_END@
- */
-/*
- * @OSF_COPYRIGHT@
- *
- */
-/*
- * HISTORY
- *
- * Revision 1.1.1.1 1998/09/22 21:05:30 wsanchez
- * Import of Mac OS X kernel (~semeria)
- *
- * Revision 1.1.1.1 1998/03/07 02:25:45 wsanchez
- * Import of OSF Mach kernel (~mburg)
- *
- * Revision 1.1.4.1 1995/06/13 18:20:29 sjs
- * Merged from flipc_shared.
- * [95/06/07 sjs]
- *
- * Revision 1.1.2.3 1995/03/09 19:42:30 rwd
- * Move yield function out of macro and prototype.
- * [1995/03/09 19:36:25 rwd]
- *
- * Revision 1.1.2.2 1995/02/21 17:23:11 randys
- * Re-indented code to four space indentation
- * [1995/02/21 16:25:39 randys]
- *
- * Revision 1.1.2.1 1994/12/20 19:02:06 randys
- * Moved definition of flipc_simple_lock to flipc_cb.h
- * [1994/12/20 17:34:44 randys]
- *
- * Separated the lock macros out into machine dependent and independent files;
- * this is the machine independent file.
- * [1994/12/20 16:43:38 randys]
- *
- * $EndLog$
- */
-
-/*
- * mach/flipc_locks.h
- *
- * The machine independent part of the flipc_simple_locks definitions.
- * Most of the locks definitions is in flipc_dep.h, but what isn't
- * dependent on the platform being used is here.
- */
-
-/*
- * Note that the locks defined in this file and in flipc_dep.h are only
- * for use by user level code. The reason why this file is visible to
- * the kernel is that the kernel section of flipc needs to initialize
- * these locks.
- */
-
-#ifndef _MACH_FLIPC_LOCKS_H_
-#define _MACH_FLIPC_LOCKS_H_
-
-/* Get the simple lock type. */
-#include <mach/flipc_cb.h>
-
-/*
- * Lock function prototypes. This needs to be before any lock definitions
- * that happen to be macros.
- */
-
-/* Initializes lock. Always a macro (so that kernel code can use it without
- library assistance). */
-void flipc_simple_lock_init(flipc_simple_lock *lock);
-
-/* Returns 1 if lock gained, 0 otherwise. */
-int flipc_simple_lock_try(flipc_simple_lock *lock);
-
-/* Returns 1 if lock is locked, 0 otherwise. */
-int flipc_simple_lock_locked(flipc_simple_lock *lock);
-
-/* Releases the lock. */
-void flipc_simple_lock_release(flipc_simple_lock *lock);
-
-/* Take the lock. */
-void flipc_simple_lock_acquire(flipc_simple_lock *lock);
-
-/* Take two locks. Does not hold one while spinning on the
- other. */
-void flipc_simple_lock_acquire_2(flipc_simple_lock *lock1,
- flipc_simple_lock *lock2);
-
-/* Get the machine dependent stuff. The things that need to be
- * defined in a machine dependent fashion are:
- *
- * flipc_simple_lock_init (must be a macro)
- * flipc_simple_lock_try
- * flipc_simple_lock_locked
- * flipc_simple_lock_release
- *
- * These last three don't necessarily have to be macros, but if they
- * aren't definitions must be included in the machine dependent
- * part of the user level library code.
- */
-#include <mach/machine/flipc_dep.h>
-
-/*
- * Set at flipc initialization time to thread_yield argument to
- * FLIPC_domain_init
- */
-
-extern void (*flipc_simple_lock_yield_fn)(void);
-
-/*
- * Machine independent definitions; defined in terms of above routines.
- */
-
-/* Take the lock. Assumes an external define saying how long to
- spin, and an external function to call when we've spun too long. */
-#define flipc_simple_lock_acquire(lock) \
-do { \
- int __spin_count = 0; \
- \
- while (flipc_simple_lock_locked(lock) \
- || !flipc_simple_lock_try(lock)) \
- if (++__spin_count > LOCK_SPIN_LIMIT) { \
- (*flipc_simple_lock_yield_fn)(); \
- __spin_count = 0; \
- } \
-} while (0)
-
-/* Take two locks. Hold neither while spinning on the other. */
-#define flipc_simple_lock_acquire_2(lock1, lock2) \
-do { \
- int __spin_count = 0; \
- \
- while (1) { \
- while (flipc_simple_lock_locked(lock1) \
- || !flipc_simple_lock_try(lock1)) \
- if (++__spin_count > LOCK_SPIN_LIMIT) { \
- (*flipc_simple_lock_yield_fn)(); \
- __spin_count = 0; \
- } \
- \
- if (flipc_simple_lock_try(lock2)) \
- break; \
- flipc_simple_lock_release(lock1); \
- \
- while (flipc_simple_lock_locked(lock2) \
- || !flipc_simple_lock_try(lock2)) \
- if (++__spin_count > LOCK_SPIN_LIMIT) { \
- (*flipc_simple_lock_yield_fn)(); \
- __spin_count = 0; \
- } \
- \
- if (flipc_simple_lock_try(lock1)) \
- break; \
- flipc_simple_lock_release(lock2); \
- } \
-} while (0)
-
-#endif /* _MACH_FLIPC_LOCKS_H_ */
projects / apple / xnu.git / blobdiff