| | 1 | /* |
| | 2 | * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. |
| | 7 | * |
| | 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 |
| | 17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 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. |
| | 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 */ |
projects / apple / xnu.git / blame_incremental