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