| 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 | |
