qpid/sys/windows/Mutex.h Source File

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qpid/sys/windows/Mutex.h
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    00001 #ifndef _sys_windows_Mutex_h
    00002 #define _sys_windows_Mutex_h
    00003
    00004 /*
    00005  *
    00006  * Copyright (c) 2008 The Apache Software Foundation
    00007  *
    00008  * Licensed under the Apache License, Version 2.0 (the "License");
    00009  * you may not use this file except in compliance with the License.
    00010  * You may obtain a copy of the License at
    00011  *
    00012  *    http://www.apache.org/licenses/LICENSE-2.0
    00013  *
    00014  * Unless required by applicable law or agreed to in writing, software
    00015  * distributed under the License is distributed on an "AS IS" BASIS,
    00016  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    00017  * See the License for the specific language governing permissions and
    00018  * limitations under the License.
    00019  *
    00020  */
    00021
    00022 #include "qpid/sys/windows/check.h"
    00023
    00024 #include <boost/version.hpp>
    00025 #if (BOOST_VERSION < 103500)
    00026 #error The Windows port requires Boost version 1.35.0 or later
    00027 #endif
    00028
    00029 #include <boost/noncopyable.hpp>
    00030 #include <boost/thread/recursive_mutex.hpp>
    00031 #include <boost/thread/shared_mutex.hpp>
    00032 #include <boost/thread/thread_time.hpp>
    00033 #include <boost/thread/tss.hpp>
    00034
    00035 namespace qpid {
    00036 namespace sys {
    00037
    00038 class Condition;
    00039
    00043 class Mutex : private boost::noncopyable {
    00044     friend class Condition;
    00045
    00046 public:
    00047     typedef ::qpid::sys::ScopedLock<Mutex> ScopedLock;
    00048     typedef ::qpid::sys::ScopedUnlock<Mutex> ScopedUnlock;
    00049
    00050     inline Mutex();
    00051     inline ~Mutex();
    00052     inline void lock();
    00053     inline void unlock();
    00054     inline bool trylock();
    00055
    00056
    00057 protected:
    00058     boost::recursive_mutex mutex;
    00059 };
    00060
    00064 class RWlock : private boost::noncopyable {
    00065     friend class Condition;
    00066
    00067 public:
    00068     typedef ::qpid::sys::ScopedRlock<RWlock> ScopedRlock;
    00069     typedef ::qpid::sys::ScopedWlock<RWlock> ScopedWlock;
    00070
    00071     inline RWlock();
    00072     inline ~RWlock();
    00073     inline void wlock();  // will write-lock
    00074     inline void rlock();  // will read-lock
    00075     inline void unlock();
    00076     inline void trywlock();  // will write-try
    00077     inline void tryrlock();  // will read-try
    00078
    00079 protected:
    00080     boost::shared_mutex rwMutex;
    00081     boost::thread_specific_ptr<bool> haveWrite;
    00082
    00083     inline bool &write (void);
    00084 };
    00085
    00086
    00091 struct PODMutex
    00092 {
    00093     typedef ::qpid::sys::ScopedLock<PODMutex> ScopedLock;
    00094
    00095     inline void lock();
    00096     inline void unlock();
    00097     inline bool trylock();
    00098
    00099     // Must be public to be a POD:
    00100     boost::recursive_mutex mutex;
    00101 };
    00102
    00103 #define QPID_MUTEX_INITIALIZER 0
    00104
    00105 void PODMutex::lock() {
    00106     mutex.lock();
    00107 }
    00108
    00109 void PODMutex::unlock() {
    00110     mutex.unlock();
    00111 }
    00112
    00113 bool PODMutex::trylock() {
    00114     return mutex.try_lock();
    00115 }
    00116
    00117 Mutex::Mutex() {
    00118 }
    00119
    00120 Mutex::~Mutex(){
    00121 }
    00122
    00123 void Mutex::lock() {
    00124     mutex.lock();
    00125 }
    00126
    00127 void Mutex::unlock() {
    00128     mutex.unlock();
    00129 }
    00130
    00131 bool Mutex::trylock() {
    00132     return mutex.try_lock();
    00133 }
    00134
    00135
    00136 RWlock::RWlock() {
    00137 }
    00138
    00139 RWlock::~RWlock(){
    00140 }
    00141
    00142 void RWlock::wlock() {
    00143     bool &writer = write();
    00144     rwMutex.lock();
    00145     writer = true;    // Remember this thread has write lock held.
    00146 }
    00147
    00148 void RWlock::rlock() {
    00149     bool &writer = write();
    00150     rwMutex.lock_shared();
    00151     writer = false;   // Remember this thread has shared lock held.
    00152 }
    00153
    00154 void RWlock::unlock() {
    00155     bool &writer = write();
    00156     if (writer)
    00157         rwMutex.unlock();
    00158     else
    00159         rwMutex.unlock_shared();
    00160 }
    00161
    00162 void RWlock::trywlock() {
    00163     bool &writer = write();
    00164     // shared_mutex::try_lock() seems to not be available... emulate it with
    00165     // a timed lock().
    00166     boost::system_time now = boost::get_system_time();
    00167     if (rwMutex.timed_lock(now))
    00168         writer = true;
    00169 }
    00170
    00171 void RWlock::tryrlock() {
    00172     bool &writer = write();
    00173     if (rwMutex.try_lock_shared())
    00174         writer = false;
    00175 }
    00176
    00177 bool & RWlock::write (void) {
    00178     // Accessing thread-specific and stack-local info, so no locks needed.
    00179     bool *writePtr = haveWrite.get();
    00180     if (writePtr == 0) {
    00181         writePtr = new bool(false);
    00182         haveWrite.reset(writePtr);
    00183     }
    00184     return *writePtr;
    00185 }
    00186
    00187 }}
    00188 #endif