1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/xpcom/build/IOInterposerPrivate.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,167 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ts=8 sts=2 et sw=2 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef xpcom_build_IOInterposerPrivate_h
1.11 +#define xpcom_build_IOInterposerPrivate_h
1.12 +
1.13 +/* This header file contains declarations for helper classes that are
1.14 + to be used exclusively by IOInterposer and its observers. This header
1.15 + file is not to be used by anything else and MUST NOT be exported! */
1.16 +
1.17 +#include <prcvar.h>
1.18 +#include <prlock.h>
1.19 +
1.20 +namespace mozilla {
1.21 +namespace IOInterposer {
1.22 +
1.23 +/**
1.24 + * The following classes are simple wrappers for PRLock and PRCondVar.
1.25 + * IOInterposer and friends use these instead of Mozilla::Mutex et al because
1.26 + * of the fact that IOInterposer is permitted to run until the process
1.27 + * terminates; we can't use anything that plugs into leak checkers or deadlock
1.28 + * detectors because IOInterposer will outlive those and generate false
1.29 + * positives.
1.30 + */
1.31 +
1.32 +class Monitor
1.33 +{
1.34 +public:
1.35 + Monitor()
1.36 + : mLock(PR_NewLock())
1.37 + , mCondVar(PR_NewCondVar(mLock))
1.38 + {
1.39 + }
1.40 +
1.41 + ~Monitor()
1.42 + {
1.43 + PR_DestroyCondVar(mCondVar);
1.44 + mCondVar = nullptr;
1.45 + PR_DestroyLock(mLock);
1.46 + mLock = nullptr;
1.47 + }
1.48 +
1.49 + void Lock()
1.50 + {
1.51 + PR_Lock(mLock);
1.52 + }
1.53 +
1.54 + void Unlock()
1.55 + {
1.56 + PR_Unlock(mLock);
1.57 + }
1.58 +
1.59 + bool Wait(PRIntervalTime aTimeout = PR_INTERVAL_NO_TIMEOUT)
1.60 + {
1.61 + return PR_WaitCondVar(mCondVar, aTimeout) == PR_SUCCESS;
1.62 + }
1.63 +
1.64 + bool Notify()
1.65 + {
1.66 + return PR_NotifyCondVar(mCondVar) == PR_SUCCESS;
1.67 + }
1.68 +
1.69 +private:
1.70 + PRLock* mLock;
1.71 + PRCondVar* mCondVar;
1.72 +};
1.73 +
1.74 +class MonitorAutoLock
1.75 +{
1.76 +public:
1.77 + MonitorAutoLock(Monitor &aMonitor)
1.78 + : mMonitor(aMonitor)
1.79 + {
1.80 + mMonitor.Lock();
1.81 + }
1.82 +
1.83 + ~MonitorAutoLock()
1.84 + {
1.85 + mMonitor.Unlock();
1.86 + }
1.87 +
1.88 + bool Wait(PRIntervalTime aTimeout = PR_INTERVAL_NO_TIMEOUT)
1.89 + {
1.90 + return mMonitor.Wait(aTimeout);
1.91 + }
1.92 +
1.93 + bool Notify()
1.94 + {
1.95 + return mMonitor.Notify();
1.96 + }
1.97 +
1.98 +private:
1.99 + Monitor& mMonitor;
1.100 +};
1.101 +
1.102 +class MonitorAutoUnlock
1.103 +{
1.104 +public:
1.105 + MonitorAutoUnlock(Monitor &aMonitor)
1.106 + : mMonitor(aMonitor)
1.107 + {
1.108 + mMonitor.Unlock();
1.109 + }
1.110 +
1.111 + ~MonitorAutoUnlock()
1.112 + {
1.113 + mMonitor.Lock();
1.114 + }
1.115 +
1.116 +private:
1.117 + Monitor& mMonitor;
1.118 +};
1.119 +
1.120 +class Mutex
1.121 +{
1.122 +public:
1.123 + Mutex()
1.124 + : mPRLock(PR_NewLock())
1.125 + {
1.126 + }
1.127 +
1.128 + ~Mutex()
1.129 + {
1.130 + PR_DestroyLock(mPRLock);
1.131 + mPRLock = nullptr;
1.132 + }
1.133 +
1.134 + void Lock()
1.135 + {
1.136 + PR_Lock(mPRLock);
1.137 + }
1.138 +
1.139 + void Unlock()
1.140 + {
1.141 + PR_Unlock(mPRLock);
1.142 + }
1.143 +
1.144 +private:
1.145 + PRLock* mPRLock;
1.146 +};
1.147 +
1.148 +class AutoLock
1.149 +{
1.150 +public:
1.151 + AutoLock(Mutex& aLock)
1.152 + : mLock(aLock)
1.153 + {
1.154 + mLock.Lock();
1.155 + }
1.156 +
1.157 + ~AutoLock()
1.158 + {
1.159 + mLock.Unlock();
1.160 + }
1.161 +
1.162 +private:
1.163 + Mutex& mLock;
1.164 +};
1.165 +
1.166 +} // namespace IOInterposer
1.167 +} // namespace mozilla
1.168 +
1.169 +#endif // xpcom_build_IOInterposerPrivate_h
1.170 +
