| | 1 | /* |
| | 2 | * Copyright (c) 1998-2010 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_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. Please obtain a copy of the License at |
| | 10 | * http://www.opensource.apple.com/apsl/ and read it before using this |
| | 11 | * file. |
| | 12 | * |
| | 13 | * The Original Code and all software distributed under the License are |
| | 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| | 18 | * Please see the License for the specific language governing rights and |
| | 19 | * limitations under the License. |
| | 20 | * |
| | 21 | * @APPLE_LICENSE_HEADER_END@ |
| | 22 | */ |
| | 23 | |
| | 24 | #include <architecture/i386/asm_help.h> |
| | 25 | |
| | 26 | TEXT |
| | 27 | |
| | 28 | /* |
| | 29 | * void |
| | 30 | * OSSpinLockUnlock(p) |
| | 31 | * int *p; |
| | 32 | * |
| | 33 | * Unlock the lock pointed to by p. |
| | 34 | */ |
| | 35 | |
| | 36 | LEAF(_OSSpinLockUnlock, 0) |
| | 37 | LEAF(_IOSpinUnlock, 0) |
| | 38 | LEAF(_ev_unlock, 0) |
| | 39 | movl 4(%esp), %ecx |
| | 40 | movl $0, (%ecx) |
| | 41 | END(_OSSpinLockUnlock) |
| | 42 | |
| | 43 | |
| | 44 | /* |
| | 45 | * int |
| | 46 | * OSSpinLockTry(p) |
| | 47 | * int *p; |
| | 48 | * |
| | 49 | * Try to lock p. Return zero if not successful. |
| | 50 | */ |
| | 51 | |
| | 52 | LEAF(_OSSpinLockTry, 0) |
| | 53 | LEAF(_IOTrySpinLock, 0) |
| | 54 | LEAF(_ev_try_lock, 0) |
| | 55 | movl 4(%esp), %ecx |
| | 56 | xorl %eax, %eax |
| | 57 | lock |
| | 58 | cmpxchgl %ecx, (%ecx) |
| | 59 | jne 1f |
| | 60 | movl $1, %eax /* yes */ |
| | 61 | ret |
| | 62 | 1: |
| | 63 | xorl %eax, %eax /* no */ |
| | 64 | END(_OSSpinLockTry) |
projects / apple / xnu.git / blame_incremental