Annotation of sys/arch/m68k/m68k/mutex.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: mutex.c,v 1.1 2007/02/03 20:08:49 miod Exp $ */
2:
3: /*
4: * Copyright (c) 2004 Artur Grabowski <art@openbsd.org>
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: *
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. The name of the author may not be used to endorse or promote products
14: * derived from this software without specific prior written permission.
15: *
16: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
17: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
18: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
19: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
28: #include <sys/param.h>
29: #include <sys/mutex.h>
30: #include <sys/systm.h>
31:
32: #include <machine/psl.h>
33: #include <machine/intr.h>
34:
35: #ifdef MULTIPROCESSOR
36: #error This code needs work
37: #endif
38:
39: /*
40: * Single processor systems don't need any mutexes, but they need the spl
41: * raising semantics of the mutexes.
42: */
43: void
44: mtx_init(struct mutex *mtx, int wantipl)
45: {
46: mtx->mtx_oldipl = 0;
47: mtx->mtx_wantipl = wantipl;
48: mtx->mtx_lock = 0;
49: }
50:
51: void
52: mtx_enter(struct mutex *mtx)
53: {
54: if (mtx->mtx_wantipl != IPL_NONE)
55: mtx->mtx_oldipl = _splraise(IPLTOPSL(mtx->mtx_wantipl));
56:
57: MUTEX_ASSERT_UNLOCKED(mtx);
58: mtx->mtx_lock = 1;
59: }
60:
61: void
62: mtx_leave(struct mutex *mtx)
63: {
64: MUTEX_ASSERT_LOCKED(mtx);
65: mtx->mtx_lock = 0;
66: if (mtx->mtx_wantipl != IPL_NONE)
67: splx(mtx->mtx_oldipl);
68: }
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