projects / apple / xnu.git / blame
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|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| d7e50217 | 6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. |
| 1c79356b | 7 | * |
| d7e50217 A |
8 | * This file contains Original Code and/or Modifications of Original Code |
| 9 | * as defined in and that are subject to the Apple Public Source License | |
| 10 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 11 | * compliance with the License. Please obtain a copy of the License at | |
| 12 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 13 | * file. | |
| 14 | * | |
| 15 | * The Original Code and all software distributed under the License are | |
| 16 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 1c79356b A |
17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| d7e50217 A |
19 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| 20 | * Please see the License for the specific language governing rights and | |
| 21 | * limitations under the License. | |
| 1c79356b A |
22 | * |
| 23 | * @APPLE_LICENSE_HEADER_END@ | |
| 24 | */ | |
| 25 | /* | |
| 26 | * Copyright (c) 1998 Apple Computer, Inc. All rights reserved. | |
| 27 | * | |
| 28 | * HISTORY | |
| 29 | * | |
| 30 | */ | |
| 31 | ||
| 32 | /* | |
| 33 | * Multiprocessor locks used within the shared memory area between the | |
| 34 | * kernel and event system. These must work in both user and kernel mode. | |
| 35 | * | |
| 36 | * These routines are public, for the purpose of writing frame buffer device | |
| 37 | * drivers which handle their own cursors. Certain architectures define a | |
| 38 | * generic display class which handles cursor drawing and is subclassed by | |
| 39 | * driver writers. These drivers need not be concerned with the following | |
| 40 | * types and definitions. | |
| 41 | * | |
| 42 | * The ev_lock(), ev_unlock(), and ev_try_lock() functions are available only | |
| 43 | * to drivers built in or dynamically loaded into the kernel, and to DPS | |
| 44 | * drivers built in or dynamically loaded into the Window Server. They do not | |
| 45 | * exist in any shared library. | |
| 46 | * | |
| 47 | * --> They're now in IOKit user lib. | |
| 48 | */ | |
| 49 | ||
| 50 | #ifndef _IOKIT_IOSHAREDLOCK_H | |
| 51 | #define _IOKIT_IOSHAREDLOCK_H | |
| 52 | ||
| 53 | #ifdef __cplusplus | |
| 54 | extern "C" { | |
| 55 | #endif | |
| 56 | ||
| 57 | // should be 32 bytes on PPC | |
| 58 | typedef volatile int IOSharedLockData; | |
| 59 | typedef IOSharedLockData * IOSharedLock; | |
| 60 | ||
| 61 | #define IOSpinLockInit(l) (*(l) = (IOSpinLockData)0) | |
| 62 | ||
| 63 | extern void IOSpinLock(IOSharedLock l); | |
| 64 | extern void IOSpinUnlock(IOSharedLock l); | |
| 65 | extern boolean_t IOTrySpinLock(IOSharedLock l); | |
| 66 | ||
| 67 | /* exact same stuff & implementation */ | |
| 68 | ||
| 69 | typedef IOSharedLockData ev_lock_data_t; | |
| 70 | typedef ev_lock_data_t * ev_lock_t; | |
| 71 | ||
| 72 | #define ev_init_lock(l) (*(l) = (ev_lock_data_t)0) | |
| 73 | // needs isync? | |
| 74 | //#define ev_is_locked(l) (*(l) != (ev_lock_data_t)0) | |
| 75 | ||
| 76 | extern void ev_lock(ev_lock_t l); // Spin lock! | |
| 77 | extern void ev_unlock(ev_lock_t l); | |
| 78 | extern boolean_t ev_try_lock(ev_lock_t l); | |
| 79 | ||
| 80 | #ifdef __cplusplus | |
| 81 | } | |
| 82 | #endif | |
| 83 | #endif /* ! _IOKIT_IOSHAREDLOCK_H */ |