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 57extern "C" { 58#endif 59 60// should be 32 bytes on PPC 61typedef volatile int IOSharedLockData; 62typedef IOSharedLockData * IOSharedLock; 63 64#define IOSpinLockInit(l) (*(l) = (IOSharedLockData)0) 65 66#ifndef KERNEL 67extern void IOSpinLock(IOSharedLock l); 68#endif 69 70extern void IOSpinUnlock(IOSharedLock l); 71extern boolean_t IOTrySpinLock(IOSharedLock l); 72 73/* exact same stuff & implementation */ 74 75typedef IOSharedLockData ev_lock_data_t; 76typedef ev_lock_data_t * ev_lock_t; 77 78#define ev_init_lock(l) (*(l) = (ev_lock_data_t)0) 79// needs isync? 80//#define ev_is_locked(l) (*(l) != (ev_lock_data_t)0) 81 82#ifndef KERNEL 83extern void ev_lock(ev_lock_t l); // Spin lock! 84#endif 85 86extern void ev_unlock(ev_lock_t l); 87extern boolean_t ev_try_lock(ev_lock_t l); 88 89#ifdef __cplusplus 90} 91#endif 92#endif /* ! _IOKIT_IOSHAREDLOCK_H */ 93