xnu-201.19.tar.gz
[apple/xnu.git] / bsd / kern / parallel.c
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A
1/*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * The contents of this file constitute Original Code as defined in and
7 * are subject to the Apple Public Source License Version 1.1 (the
8 * "License"). You may not use this file except in compliance with the
9 * License. Please obtain a copy of the License at
10 * http://www.apple.com/publicsource and read it before using this file.
11 *
12 * This Original Code and all software distributed under the License are
13 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17 * License for the specific language governing rights and limitations
18 * under the License.
19 *
20 * @APPLE_LICENSE_HEADER_END@
21 */
22/*
23 * Mach Operating System
24 * Copyright (c) 1989 Carnegie-Mellon University
25 * Copyright (c) 1988 Carnegie-Mellon University
26 * Copyright (c) 1987 Carnegie-Mellon University
27 * All rights reserved. The CMU software License Agreement specifies
28 * the terms and conditions for use and redistribution.
29 */
30/*
31 * HISTORY
32 *
33 * Revision 1.1.1.1 1998/09/22 21:06:13 wsanchez
34 * Import of Mac OS X kernel (~semeria)
35 *
36 * Revision 1.1.1.1 1997/09/30 02:44:39 wsanchez
37 * Import of kernel from umeshv/kernel
38 *
39 * Revision 2.4 89/12/22 15:52:48 rpd
40 * MACH_HOST support: when releasing master, context switch away
41 * immediately if thread is not assigned to default processor set.
42 * [89/11/16 dlb]
43 *
44 * Revision 2.3 89/10/11 14:19:20 dlb
45 * Processor logic - explicitly record bound processor in thread
46 * instead of changing whichq pointer.
47 * [88/09/30 dlb]
48 *
49 * Revision 2.2 89/02/25 18:07:24 gm0w
50 * Changes for cleanup.
51 *
52 * 15-Oct-87 David Golub (dbg) at Carnegie-Mellon University
53 * Use thread_bind (inline version) to bind thread to master cpu
54 * while holding unix-lock.
55 *
56 * 9-Oct-87 Robert Baron (rvb) at Carnegie-Mellon University
57 * Define unix_reset for longjmp/setjmp reset.
58 *
59 * 25-Sep-87 Robert Baron (rvb) at Carnegie-Mellon University
60 * Clean out some debugging code.
61 *
62 * 21-Sep-87 Robert Baron (rvb) at Carnegie-Mellon University
63 * Created.
64 *
65 */
66
67
68#include <cpus.h>
69#include <mach_host.h>
70
71#if NCPUS > 1
72
73#include <kern/processor.h>
74#include <kern/thread.h>
75#include <kern/sched_prim.h>
76#include <kern/parallel.h>
77
78void unix_master()
79{
80 register thread_t t = current_thread();
81
82 if (! (++( t->unix_lock ))) {
83
84 /* thread_bind(t, master_processor); */
85 t->bound_processor = master_processor;
86
87 if (cpu_number() != master_cpu) {
88 t->interruptible = FALSE;
89 thread_block(0);
90 }
91 }
92}
93
94void unix_release()
95{
96 register thread_t t = current_thread();
97
98 t->unix_lock--;
99 if (t->unix_lock < 0) {
100 /* thread_bind(t, PROCESSOR_NULL); */
101 t->bound_processor = PROCESSOR_NULL;
102#if MACH_HOST
103 if (t->processor_set != &default_pset)
104 thread_block(0);
105#endif MACH_HOST
106 }
107}
108
109void unix_reset()
110{
111 register thread_t t = current_thread();
112
113 if (t->unix_lock != -1)
114 t->unix_lock = 0;
115}
116
117#endif NCPUS > 1