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Annotation of kernel/mach/ppc/simple_lock.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: 
                     25: /* Copyright (c) 1997 Apple Computer, Inc.  All rights reserved.
                     26:  * 
                     27:  *     File:   mach/ppc/simple_lock.h
                     28:  *
                     29:  *     This file contains machine dependent code for exclusion
                     30:  *     lock handling on PowerPC-based products.
                     31:  *
                     32:  */
                     33: 
                     34: #ifndef        _MACH_PPC_SIMPLE_LOCK_
                     35: #define _MACH_PPC_SIMPLE_LOCK_
                     36: 
                     37: #include <mach/ppc/boolean.h>
                     38: 
                     39: #define        _MACHINE_SIMPLE_LOCK_DATA_
                     40: 
                     41: struct slock{
                     42:        volatile unsigned int lock_data[4];/* in general 1 bit is sufficient */
                     43: };
                     44: 
                     45: typedef struct slock   simple_lock_data_t;
                     46: typedef struct slock   *simple_lock_t;
                     47: 
                     48: #if defined(_KERNEL)
                     49: 
                     50: #if    !defined(DEFINE_SIMPLE_LOCK_PRIMS)
                     51: extern __inline__
                     52: #endif
                     53: void
                     54: simple_lock_init(
                     55:     simple_lock_t      slock
                     56: )
                     57: {
                     58:        slock->lock_data[0] = 0;
                     59:        slock->lock_data[1] = 0;
                     60:        slock->lock_data[2] = 0;
                     61:        slock->lock_data[3] = 0;
                     62: }
                     63: 
                     64: #if    !defined(DEFINE_SIMPLE_LOCK_PRIMS)
                     65: extern __inline__
                     66: #endif
                     67: void
                     68: simple_unlock(
                     69:     simple_lock_t      slock
                     70: )
                     71: {
                     72:        __asm__ volatile ("sync");
                     73:     *((volatile int *)(slock)) = 0;
                     74: }
                     75: 
                     76: #if    !defined(DEFINE_SIMPLE_LOCK_PRIMS)
                     77: extern __inline__
                     78: #endif
                     79: boolean_t
                     80: simple_lock_try(
                     81:     simple_lock_t      slock
                     82: )
                     83: {
                     84:        extern boolean_t test_and_set();
                     85:     boolean_t          result;
                     86:        
                     87:     result = test_and_set(0, (int *)slock);
                     88:        
                     89:     return (!result);
                     90: }
                     91: 
                     92: 
                     93: 
                     94: #if    !defined(DEFINE_SIMPLE_LOCK_PRIMS)
                     95: extern __inline__
                     96: #endif
                     97: void
                     98: #if DIAGNOSTIC
                     99: real_simple_lock(
                    100: #else
                    101: simple_lock(
                    102: #endif
                    103:     simple_lock_t      slock
                    104: )
                    105: {    
                    106:        extern boolean_t test_and_set();
                    107:     while (test_and_set(0, (int *)slock))
                    108:                continue;
                    109: }
                    110: 
                    111: #endif /* _KERNEL */
                    112: #endif /* _MACH_PPC_SIMPLE_LOCK_ */

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