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#ifndef _sys_windows_Mutex_h
#define _sys_windows_Mutex_h
/*
*
* Copyright (c) 2008 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "qpid/sys/windows/check.h"
#include <boost/version.hpp>
#if (BOOST_VERSION < 103500)
#error The Windows port requires Boost version 1.35.0 or later
#endif
#include <boost/noncopyable.hpp>
#include <boost/thread/recursive_mutex.hpp>
#include <boost/thread/shared_mutex.hpp>
#include <boost/thread/thread_time.hpp>
#include <boost/thread/tss.hpp>
namespace qpid {
namespace sys {
class Condition;
/**
* Mutex lock.
*/
class Mutex : private boost::noncopyable {
friend class Condition;
public:
typedef ::qpid::sys::ScopedLock<Mutex> ScopedLock;
typedef ::qpid::sys::ScopedUnlock<Mutex> ScopedUnlock;
inline Mutex();
inline ~Mutex();
inline void lock();
inline void unlock();
inline bool trylock();
protected:
boost::recursive_mutex mutex;
};
/**
* RW lock.
*/
class RWlock : private boost::noncopyable {
friend class Condition;
public:
typedef ::qpid::sys::ScopedRlock<RWlock> ScopedRlock;
typedef ::qpid::sys::ScopedWlock<RWlock> ScopedWlock;
inline RWlock();
inline ~RWlock();
inline void wlock(); // will write-lock
inline void rlock(); // will read-lock
inline void unlock();
inline void trywlock(); // will write-try
inline void tryrlock(); // will read-try
protected:
boost::shared_mutex rwMutex;
boost::thread_specific_ptr<bool> haveWrite;
inline bool &write (void);
};
/**
* PODMutex is a POD, can be static-initialized with
* PODMutex m = QPID_PODMUTEX_INITIALIZER
*/
struct PODMutex
{
typedef ::qpid::sys::ScopedLock<PODMutex> ScopedLock;
inline void lock();
inline void unlock();
inline bool trylock();
// Must be public to be a POD:
boost::recursive_mutex mutex;
};
#define QPID_MUTEX_INITIALIZER 0
void PODMutex::lock() {
mutex.lock();
}
void PODMutex::unlock() {
mutex.unlock();
}
bool PODMutex::trylock() {
return mutex.try_lock();
}
Mutex::Mutex() {
}
Mutex::~Mutex(){
}
void Mutex::lock() {
mutex.lock();
}
void Mutex::unlock() {
mutex.unlock();
}
bool Mutex::trylock() {
return mutex.try_lock();
}
RWlock::RWlock() {
}
RWlock::~RWlock(){
}
void RWlock::wlock() {
bool &writer = write();
rwMutex.lock();
writer = true; // Remember this thread has write lock held.
}
void RWlock::rlock() {
bool &writer = write();
rwMutex.lock_shared();
writer = false; // Remember this thread has shared lock held.
}
void RWlock::unlock() {
bool &writer = write();
if (writer)
rwMutex.unlock();
else
rwMutex.unlock_shared();
}
void RWlock::trywlock() {
bool &writer = write();
// shared_mutex::try_lock() seems to not be available... emulate it with
// a timed lock().
boost::system_time now = boost::get_system_time();
if (rwMutex.timed_lock(now))
writer = true;
}
void RWlock::tryrlock() {
bool &writer = write();
if (rwMutex.try_lock_shared())
writer = false;
}
bool & RWlock::write (void) {
// Accessing thread-specific and stack-local info, so no locks needed.
bool *writePtr = haveWrite.get();
if (writePtr == 0) {
writePtr = new bool(false);
haveWrite.reset(writePtr);
}
return *writePtr;
}
}}
#endif /*!_sys_windows_Mutex_h*/
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