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/* Copyright (c) 2003-2005 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
#ifndef BLOCK_MUTEX_HPP
#define BLOCK_MUTEX_HPP
#include "Callback.hpp"
#include "SimulatedBlock.hpp"
class Mutex;
/**
* MutexHandle - A "reference" to a mutex
* - Should be used together with Mutex
*/
class MutexHandle {
friend class Mutex;
public:
MutexHandle(Uint32 id);
bool isNull() const;
void release(SimulatedBlock::MutexManager & mgr);
private:
const Uint32 m_mutexId;
Uint32 m_activeMutexPtrI;
};
/**
* MutexHandle2 - A template-based "reference" to a mutex
*/
template<Uint32 MutexId>
class MutexHandle2 {
friend class Mutex;
public:
MutexHandle2();
bool isNull() const;
void release(SimulatedBlock::MutexManager & mgr);
private:
Uint32 m_activeMutexPtrI;
};
/**
* A mutex - Used together with a MutexHandle to be put on the stack
*/
class Mutex {
public:
Mutex(Signal*, SimulatedBlock::MutexManager & mgr, MutexHandle &);
template<Uint32 MutexId>
Mutex(Signal*, SimulatedBlock::MutexManager & mgr, MutexHandle2<MutexId> &);
~Mutex();
void release();
bool isNull() const ;
bool lock(SimulatedBlock::Callback & callback);
bool trylock(SimulatedBlock::Callback & callback);
void unlock(SimulatedBlock::Callback & callback);
void unlock(); // Ignore callback
bool create(SimulatedBlock::Callback & callback);
bool destroy(SimulatedBlock::Callback & callback);
private:
Signal* m_signal;
SimulatedBlock::MutexManager & m_mgr;
const Uint32 m_mutexId;
Uint32 & m_srcPtrI;
SimulatedBlock::MutexManager::ActiveMutexPtr m_ptr;
public:
static void release(SimulatedBlock::MutexManager&,
Uint32 activePtrI, Uint32 mutexId);
};
inline
MutexHandle::MutexHandle(Uint32 id) : m_mutexId(id) {
m_activeMutexPtrI = RNIL;
}
inline
bool
MutexHandle::isNull() const {
return m_activeMutexPtrI == RNIL;
}
inline
void
MutexHandle::release(SimulatedBlock::MutexManager & mgr){
if(!isNull()){
Mutex::release(mgr, m_activeMutexPtrI, m_mutexId);
m_activeMutexPtrI = RNIL;
}
}
template<Uint32 MutexId>
inline
MutexHandle2<MutexId>::MutexHandle2() {
m_activeMutexPtrI = RNIL;
}
template<Uint32 MutexId>
inline
bool
MutexHandle2<MutexId>::isNull() const {
return m_activeMutexPtrI == RNIL;
}
template<Uint32 MutexId>
inline
void
MutexHandle2<MutexId>::release(SimulatedBlock::MutexManager & mgr){
if(!isNull()){
Mutex::release(mgr, m_activeMutexPtrI, MutexId);
m_activeMutexPtrI = RNIL;
}
}
inline
Mutex::Mutex(Signal* signal, SimulatedBlock::MutexManager & mgr,
MutexHandle & mh)
: m_signal(signal),
m_mgr(mgr),
m_mutexId(mh.m_mutexId),
m_srcPtrI(mh.m_activeMutexPtrI){
m_ptr.i = m_srcPtrI;
}
template<Uint32 MutexId>
inline
Mutex::Mutex(Signal* signal, SimulatedBlock::MutexManager & mgr,
MutexHandle2<MutexId> & mh)
: m_signal(signal),
m_mgr(mgr),
m_mutexId(MutexId),
m_srcPtrI(mh.m_activeMutexPtrI){
m_ptr.i = m_srcPtrI;
}
inline
Mutex::~Mutex(){
m_srcPtrI = m_ptr.i;
}
inline
void
Mutex::release(){
if(!m_ptr.isNull()){
Mutex::release(m_mgr, m_ptr.i, m_mutexId);
m_ptr.setNull();
}
}
inline
bool
Mutex::isNull() const {
return m_ptr.isNull();
}
inline
bool
Mutex::lock(SimulatedBlock::Callback & callback){
if(m_ptr.isNull()){
if(m_mgr.seize(m_ptr)){
m_ptr.p->m_mutexId = m_mutexId;
m_ptr.p->m_callback = callback;
m_mgr.lock(m_signal, m_ptr);
return true;
}
return false;
}
ErrorReporter::handleAssert("Mutex::lock mutex alreay inuse",
__FILE__, __LINE__);
return false;
}
inline
bool
Mutex::trylock(SimulatedBlock::Callback & callback){
if(m_ptr.isNull()){
if(m_mgr.seize(m_ptr)){
m_ptr.p->m_mutexId = m_mutexId;
m_ptr.p->m_callback = callback;
m_mgr.lock(m_signal, m_ptr);
return true;
}
return false;
}
ErrorReporter::handleAssert("Mutex::trylock mutex alreay inuse",
__FILE__, __LINE__);
return false;
}
inline
void
Mutex::unlock(SimulatedBlock::Callback & callback){
if(!m_ptr.isNull()){
m_mgr.getPtr(m_ptr);
if(m_ptr.p->m_mutexId == m_mutexId){
m_ptr.p->m_callback = callback;
m_mgr.unlock(m_signal, m_ptr);
return;
}
}
ErrorReporter::handleAssert("Mutex::unlock invalid mutex",
__FILE__, __LINE__);
}
inline
bool
Mutex::create(SimulatedBlock::Callback & callback){
if(m_ptr.isNull()){
if(m_mgr.seize(m_ptr)){
m_ptr.p->m_mutexId = m_mutexId;
m_ptr.p->m_callback = callback;
m_mgr.create(m_signal, m_ptr);
return true;
}
return false;
}
ErrorReporter::handleAssert("Mutex::create mutex alreay inuse",
__FILE__, __LINE__);
return false;
}
inline
bool
Mutex::destroy(SimulatedBlock::Callback & callback){
if(m_ptr.isNull()){
if(m_mgr.seize(m_ptr)){
m_ptr.p->m_mutexId = m_mutexId;
m_ptr.p->m_callback = callback;
m_mgr.destroy(m_signal, m_ptr);
return true;
}
return false;
}
ErrorReporter::handleAssert("Mutex::destroy mutex alreay inuse",
__FILE__, __LINE__);
return false;
}
#endif
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