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Annotation of kernel/vm/vm_pager.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: /* 
                     26:  * Mach Operating System
                     27:  * Copyright (c) 1987 Carnegie-Mellon University
                     28:  * All rights reserved.  The CMU software License Agreement specifies
                     29:  * the terms and conditions for use and redistribution.
                     30:  */
                     31: /*
                     32:  *     File:   vm_pager.h
                     33:  *     Author: Avadis Tevanian, Jr., Michael Wayne Young
                     34:  *
                     35:  *     Copyright (C) 1986, Avadis Tevanian, Jr., Michael Wayne Young
                     36:  *     Copyright (C) 1985, Avadis Tevanian, Jr., Michael Wayne Young
                     37:  *
                     38:  *     Pager routine interface definition
                     39:  */
                     40: 
                     41: #ifndef        _VM_PAGER_
                     42: #define        _VM_PAGER_
                     43: 
                     44: #import <mach/boolean.h>
                     45: 
                     46: struct pager_struct {
                     47:        boolean_t       is_device;
                     48: };
                     49: typedef        struct pager_struct     *vm_pager_t;
                     50: #define        vm_pager_null           ((vm_pager_t) 0)
                     51: 
                     52: #define        PAGER_SUCCESS           0  /* page read or written */
                     53: #define        PAGER_ABSENT            1  /* pager does not have page */
                     54: #define        PAGER_ERROR             2  /* pager unable to read or write page */
                     55: 
                     56: #ifdef KERNEL
                     57: typedef        int             pager_return_t;
                     58: 
                     59: vm_pager_t     vm_pager_allocate();
                     60: void           vm_pager_deallocate();
                     61: pager_return_t vm_pager_get();
                     62: pager_return_t vm_pager_put();
                     63: boolean_t      vm_pager_has_page();
                     64: #endif /* KERNEL */
                     65: 
                     66: #endif /* _VM_PAGER_ */

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