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Annotation of Net2/vm/vm_pageout.h, revision 1.1.1.1

1.1       root        1: /* 
                      2:  * Copyright (c) 1991 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * This code is derived from software contributed to Berkeley by
                      6:  * The Mach Operating System project at Carnegie-Mellon University.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *     This product includes software developed by the University of
                     19:  *     California, Berkeley and its contributors.
                     20:  * 4. Neither the name of the University nor the names of its contributors
                     21:  *    may be used to endorse or promote products derived from this software
                     22:  *    without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     34:  * SUCH DAMAGE.
                     35:  *
                     36:  *     @(#)vm_pageout.h        7.3 (Berkeley) 4/21/91
                     37:  *
                     38:  *
                     39:  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
                     40:  * All rights reserved.
                     41:  *
                     42:  * Author: Avadis Tevanian, Jr.
                     43:  * 
                     44:  * Permission to use, copy, modify and distribute this software and
                     45:  * its documentation is hereby granted, provided that both the copyright
                     46:  * notice and this permission notice appear in all copies of the
                     47:  * software, derivative works or modified versions, and any portions
                     48:  * thereof, and that both notices appear in supporting documentation.
                     49:  * 
                     50:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 
                     51:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 
                     52:  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     53:  * 
                     54:  * Carnegie Mellon requests users of this software to return to
                     55:  *
                     56:  *  Software Distribution Coordinator  or  [email protected]
                     57:  *  School of Computer Science
                     58:  *  Carnegie Mellon University
                     59:  *  Pittsburgh PA 15213-3890
                     60:  *
                     61:  * any improvements or extensions that they make and grant Carnegie the
                     62:  * rights to redistribute these changes.
                     63:  */
                     64: 
                     65: /*
                     66:  *     Header file for pageout daemon.
                     67:  */
                     68: 
                     69: /*
                     70:  *     Exported data structures.
                     71:  */
                     72: 
                     73: extern int     vm_pages_needed;        /* should be some "event" structure */
                     74: simple_lock_data_t     vm_pages_needed_lock;
                     75: 
                     76: 
                     77: /*
                     78:  *     Exported routines.
                     79:  */
                     80: 
                     81: /*
                     82:  *     Signal pageout-daemon and wait for it.
                     83:  */
                     84: 
                     85: #define        VM_WAIT         { \
                     86:                        simple_lock(&vm_pages_needed_lock); \
                     87:                        thread_wakeup((int)&vm_pages_needed); \
                     88:                        thread_sleep((int)&vm_page_free_count, \
                     89:                                &vm_pages_needed_lock, FALSE); \
                     90:                        }

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