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comparison: xpcom/build/IOInterposerPrivate.h
xpcom/build/IOInterposerPrivate.h
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- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:bcea771b7c4d |
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef xpcom_build_IOInterposerPrivate_h | |
| 8 #define xpcom_build_IOInterposerPrivate_h | |
| 9 | |
| 10 /* This header file contains declarations for helper classes that are | |
| 11 to be used exclusively by IOInterposer and its observers. This header | |
| 12 file is not to be used by anything else and MUST NOT be exported! */ | |
| 13 | |
| 14 #include <prcvar.h> | |
| 15 #include <prlock.h> | |
| 16 | |
| 17 namespace mozilla { | |
| 18 namespace IOInterposer { | |
| 19 | |
| 20 /** | |
| 21 * The following classes are simple wrappers for PRLock and PRCondVar. | |
| 22 * IOInterposer and friends use these instead of Mozilla::Mutex et al because | |
| 23 * of the fact that IOInterposer is permitted to run until the process | |
| 24 * terminates; we can't use anything that plugs into leak checkers or deadlock | |
| 25 * detectors because IOInterposer will outlive those and generate false | |
| 26 * positives. | |
| 27 */ | |
| 28 | |
| 29 class Monitor | |
| 30 { | |
| 31 public: | |
| 32 Monitor() | |
| 33 : mLock(PR_NewLock()) | |
| 34 , mCondVar(PR_NewCondVar(mLock)) | |
| 35 { | |
| 36 } | |
| 37 | |
| 38 ~Monitor() | |
| 39 { | |
| 40 PR_DestroyCondVar(mCondVar); | |
| 41 mCondVar = nullptr; | |
| 42 PR_DestroyLock(mLock); | |
| 43 mLock = nullptr; | |
| 44 } | |
| 45 | |
| 46 void Lock() | |
| 47 { | |
| 48 PR_Lock(mLock); | |
| 49 } | |
| 50 | |
| 51 void Unlock() | |
| 52 { | |
| 53 PR_Unlock(mLock); | |
| 54 } | |
| 55 | |
| 56 bool Wait(PRIntervalTime aTimeout = PR_INTERVAL_NO_TIMEOUT) | |
| 57 { | |
| 58 return PR_WaitCondVar(mCondVar, aTimeout) == PR_SUCCESS; | |
| 59 } | |
| 60 | |
| 61 bool Notify() | |
| 62 { | |
| 63 return PR_NotifyCondVar(mCondVar) == PR_SUCCESS; | |
| 64 } | |
| 65 | |
| 66 private: | |
| 67 PRLock* mLock; | |
| 68 PRCondVar* mCondVar; | |
| 69 }; | |
| 70 | |
| 71 class MonitorAutoLock | |
| 72 { | |
| 73 public: | |
| 74 MonitorAutoLock(Monitor &aMonitor) | |
| 75 : mMonitor(aMonitor) | |
| 76 { | |
| 77 mMonitor.Lock(); | |
| 78 } | |
| 79 | |
| 80 ~MonitorAutoLock() | |
| 81 { | |
| 82 mMonitor.Unlock(); | |
| 83 } | |
| 84 | |
| 85 bool Wait(PRIntervalTime aTimeout = PR_INTERVAL_NO_TIMEOUT) | |
| 86 { | |
| 87 return mMonitor.Wait(aTimeout); | |
| 88 } | |
| 89 | |
| 90 bool Notify() | |
| 91 { | |
| 92 return mMonitor.Notify(); | |
| 93 } | |
| 94 | |
| 95 private: | |
| 96 Monitor& mMonitor; | |
| 97 }; | |
| 98 | |
| 99 class MonitorAutoUnlock | |
| 100 { | |
| 101 public: | |
| 102 MonitorAutoUnlock(Monitor &aMonitor) | |
| 103 : mMonitor(aMonitor) | |
| 104 { | |
| 105 mMonitor.Unlock(); | |
| 106 } | |
| 107 | |
| 108 ~MonitorAutoUnlock() | |
| 109 { | |
| 110 mMonitor.Lock(); | |
| 111 } | |
| 112 | |
| 113 private: | |
| 114 Monitor& mMonitor; | |
| 115 }; | |
| 116 | |
| 117 class Mutex | |
| 118 { | |
| 119 public: | |
| 120 Mutex() | |
| 121 : mPRLock(PR_NewLock()) | |
| 122 { | |
| 123 } | |
| 124 | |
| 125 ~Mutex() | |
| 126 { | |
| 127 PR_DestroyLock(mPRLock); | |
| 128 mPRLock = nullptr; | |
| 129 } | |
| 130 | |
| 131 void Lock() | |
| 132 { | |
| 133 PR_Lock(mPRLock); | |
| 134 } | |
| 135 | |
| 136 void Unlock() | |
| 137 { | |
| 138 PR_Unlock(mPRLock); | |
| 139 } | |
| 140 | |
| 141 private: | |
| 142 PRLock* mPRLock; | |
| 143 }; | |
| 144 | |
| 145 class AutoLock | |
| 146 { | |
| 147 public: | |
| 148 AutoLock(Mutex& aLock) | |
| 149 : mLock(aLock) | |
| 150 { | |
| 151 mLock.Lock(); | |
| 152 } | |
| 153 | |
| 154 ~AutoLock() | |
| 155 { | |
| 156 mLock.Unlock(); | |
| 157 } | |
| 158 | |
| 159 private: | |
| 160 Mutex& mLock; | |
| 161 }; | |
| 162 | |
| 163 } // namespace IOInterposer | |
| 164 } // namespace mozilla | |
| 165 | |
| 166 #endif // xpcom_build_IOInterposerPrivate_h | |
| 167 |
