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1 | /* |
2 | * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved. | |
3 | * | |
4 | * @APPLE_LICENSE_HEADER_START@ | |
5 | * | |
6 | * The contents of this file constitute Original Code as defined in and | |
7 | * are subject to the Apple Public Source License Version 1.1 (the | |
8 | * "License"). You may not use this file except in compliance with the | |
9 | * License. Please obtain a copy of the License at | |
10 | * http://www.apple.com/publicsource and read it before using this file. | |
11 | * | |
12 | * This Original Code and all software distributed under the License are | |
13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the | |
17 | * License for the specific language governing rights and limitations | |
18 | * under the License. | |
19 | * | |
20 | * @APPLE_LICENSE_HEADER_END@ | |
21 | */ | |
22 | /* IOSyncer.cpp created by wgulland on 2000-02-02 */ | |
23 | ||
24 | #include <IOKit/IOLib.h> | |
25 | #include <IOKit/IOSyncer.h> | |
26 | ||
27 | OSDefineMetaClassAndStructors(IOSyncer, OSObject) | |
28 | ||
29 | IOSyncer * IOSyncer::create(bool twoRetains) | |
30 | { | |
31 | IOSyncer * me = new IOSyncer; | |
32 | ||
33 | if (me && !me->init(twoRetains)) { | |
34 | me->release(); | |
35 | return 0; | |
36 | } | |
37 | ||
38 | return me; | |
39 | } | |
40 | ||
41 | bool IOSyncer::init(bool twoRetains) | |
42 | { | |
43 | if (!OSObject::init()) | |
44 | return false; | |
45 | ||
46 | if (!(guardLock = IOSimpleLockAlloc()) ) | |
47 | return false; | |
48 | ||
49 | IOSimpleLockInit(guardLock); | |
50 | ||
51 | if(twoRetains) | |
52 | retain(); | |
53 | ||
54 | fResult = kIOReturnSuccess; | |
55 | ||
56 | reinit(); | |
57 | ||
58 | return true; | |
59 | } | |
60 | ||
61 | void IOSyncer::reinit() | |
62 | { | |
63 | IOInterruptState is = IOSimpleLockLockDisableInterrupt(guardLock); | |
64 | threadMustStop = true; | |
65 | IOSimpleLockUnlockEnableInterrupt(guardLock, is); | |
66 | } | |
67 | ||
68 | void IOSyncer::free() | |
69 | { | |
70 | // just in case a thread is blocked here: | |
71 | privateSignal(); | |
72 | ||
73 | if (guardLock != NULL) | |
74 | IOSimpleLockFree(guardLock); | |
75 | ||
76 | OSObject::free(); | |
77 | } | |
78 | ||
79 | IOReturn IOSyncer::wait(bool autoRelease = true) | |
80 | { | |
81 | IOInterruptState is = IOSimpleLockLockDisableInterrupt(guardLock); | |
82 | ||
83 | if (threadMustStop) { | |
84 | assert_wait((void *) &threadMustStop, false); | |
85 | IOSimpleLockUnlockEnableInterrupt(guardLock, is); | |
86 | thread_block(0); | |
87 | } | |
88 | else | |
89 | IOSimpleLockUnlockEnableInterrupt(guardLock, is); | |
90 | ||
91 | IOReturn result = fResult; // Pick up before auto deleting! | |
92 | ||
93 | if(autoRelease) | |
94 | release(); | |
95 | ||
96 | return result; | |
97 | } | |
98 | ||
99 | void IOSyncer::signal(IOReturn res = kIOReturnSuccess, | |
100 | bool autoRelease = true) | |
101 | { | |
102 | fResult = res; | |
103 | privateSignal(); | |
104 | if(autoRelease) | |
105 | release(); | |
106 | } | |
107 | ||
108 | void IOSyncer::privateSignal() | |
109 | { | |
110 | if (threadMustStop) { | |
111 | IOInterruptState is = IOSimpleLockLockDisableInterrupt(guardLock); | |
112 | threadMustStop = false; | |
113 | thread_wakeup_one((void *) &threadMustStop); | |
114 | IOSimpleLockUnlockEnableInterrupt(guardLock, is); | |
115 | } | |
116 | } |