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Source at commit 2350 created 10 years 5 months ago. By ifabio, remove duplicated define. | |
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1 | /*␊ |
2 | * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.␊ |
3 | *␊ |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@␊ |
5 | * ␊ |
6 | * This file contains Original Code and/or Modifications of Original Code␊ |
7 | * as defined in and that are subject to the Apple Public Source License␊ |
8 | * Version 2.0 (the 'License'). You may not use this file except in␊ |
9 | * compliance with the License. The rights granted to you under the License␊ |
10 | * may not be used to create, or enable the creation or redistribution of,␊ |
11 | * unlawful or unlicensed copies of an Apple operating system, or to␊ |
12 | * circumvent, violate, or enable the circumvention or violation of, any␊ |
13 | * terms of an Apple operating system software license agreement.␊ |
14 | * ␊ |
15 | * Please obtain a copy of the License at␊ |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file.␊ |
17 | * ␊ |
18 | * The Original Code and all software distributed under the License are␊ |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.␊ |
23 | * Please see the License for the specific language governing rights and␊ |
24 | * limitations under the License.␊ |
25 | * ␊ |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@␊ |
27 | */␊ |
28 | /*␊ |
29 | * Copyright (c) 1998 Apple Computer, Inc. All rights reserved. ␊ |
30 | *␊ |
31 | * HISTORY␊ |
32 | *␊ |
33 | */␊ |
34 | ␊ |
35 | /*␊ |
36 | * Multiprocessor locks used within the shared memory area between the␊ |
37 | * kernel and event system. These must work in both user and kernel mode.␊ |
38 | * ␊ |
39 | * These routines are public, for the purpose of writing frame buffer device␊ |
40 | * drivers which handle their own cursors. Certain architectures define a␊ |
41 | * generic display class which handles cursor drawing and is subclassed by␊ |
42 | * driver writers. These drivers need not be concerned with the following␊ |
43 | * types and definitions.␊ |
44 | *␊ |
45 | * The ev_lock(), ev_unlock(), and ev_try_lock() functions are available only␊ |
46 | * to drivers built in or dynamically loaded into the kernel, and to DPS␊ |
47 | * drivers built in or dynamically loaded into the Window Server. They do not␊ |
48 | * exist in any shared library.␊ |
49 | *␊ |
50 | * --> They're now in IOKit user lib.␊ |
51 | */␊ |
52 | ␊ |
53 | #ifndef _IOKIT_IOSHAREDLOCK_H␊ |
54 | #define _IOKIT_IOSHAREDLOCK_H␊ |
55 | ␊ |
56 | #ifdef __cplusplus␊ |
57 | extern "C" {␊ |
58 | #endif␊ |
59 | ␊ |
60 | // should be 32 bytes on PPC␊ |
61 | typedef volatile int␉␉IOSharedLockData;␊ |
62 | typedef IOSharedLockData * IOSharedLock;␊ |
63 | ␊ |
64 | #define IOSpinLockInit(l)␉(*(l) = (IOSharedLockData)0)␊ |
65 | ␊ |
66 | ␊ |
67 | extern void IOSpinUnlock(IOSharedLock l);␊ |
68 | extern boolean_t IOTrySpinLock(IOSharedLock l);␊ |
69 | ␊ |
70 | /* exact same stuff & implementation */␊ |
71 | ␊ |
72 | typedef IOSharedLockData ␉ev_lock_data_t;␊ |
73 | typedef ev_lock_data_t␉ *␉ev_lock_t;␊ |
74 | ␊ |
75 | #define ev_init_lock(l)␉␉(*(l) = (ev_lock_data_t)0)␊ |
76 | // needs isync?␊ |
77 | //#define ev_is_locked(l)␉(*(l) != (ev_lock_data_t)0)␊ |
78 | ␊ |
79 | ␊ |
80 | extern void ev_unlock(ev_lock_t l);␊ |
81 | extern boolean_t ev_try_lock(ev_lock_t l);␊ |
82 | ␊ |
83 | #ifdef __cplusplus␊ |
84 | }␊ |
85 | #endif␊ |
86 | #endif /* ! _IOKIT_IOSHAREDLOCK_H */␊ |
87 |