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15637ed4 RG |
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 | * | |
55768178 DG |
36 | * @(#)vm_pageout.h 7.3 (Berkeley) 4/21/91 |
37 | * | |
38 | * | |
15637ed4 RG |
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 Software.Distribution@CS.CMU.EDU | |
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 | */ | |
55768178 | 64 | #include <sys/systm.h> |
bbc3f849 | 65 | |
15637ed4 RG |
66 | /* |
67 | * Header file for pageout daemon. | |
68 | */ | |
69 | ||
70 | /* | |
71 | * Exported data structures. | |
72 | */ | |
73 | ||
74 | extern int vm_pages_needed; /* should be some "event" structure */ | |
55768178 | 75 | simple_lock_data_t vm_pages_needed_lock; |
15637ed4 RG |
76 | |
77 | ||
78 | /* | |
79 | * Exported routines. | |
80 | */ | |
81 | ||
82 | /* | |
83 | * Signal pageout-daemon and wait for it. | |
84 | */ | |
55768178 DG |
85 | #define VM_WAIT vm_wait() |
86 | inline static void vm_wait() { | |
87 | extern struct proc *curproc, *pageproc; | |
88 | extern int vm_pageout_pages_needed; | |
41aefbec DG |
89 | int s; |
90 | s = splhigh(); | |
55768178 DG |
91 | if (curproc == pageproc) { |
92 | vm_pageout_pages_needed = 1; | |
93 | tsleep((caddr_t) &vm_pageout_pages_needed, PSWP, "vmwait", 0); | |
94 | vm_pageout_pages_needed = 0; | |
95 | } else { | |
96 | wakeup((caddr_t) &vm_pages_needed); | |
97 | tsleep((caddr_t) &vm_page_free_count, PVM, "vmwait", 0); | |
98 | } | |
41aefbec | 99 | splx(s); |
55768178 DG |
100 | } |
101 | ||
15637ed4 | 102 |