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/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser 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 UTIL_THREAD_HEADER
#define UTIL_THREAD_HEADER
#include "../irrlichttypes.h"
#include "../jthread/jthread.h"
#include "../jthread/jmutex.h"
#include "../jthread/jmutexautolock.h"
#include "porting.h"
template<typename T>
class MutexedVariable
{
public:
MutexedVariable(T value):
m_value(value)
{
}
T get()
{
JMutexAutoLock lock(m_mutex);
return m_value;
}
void set(T value)
{
JMutexAutoLock lock(m_mutex);
m_value = value;
}
// You'll want to grab this in a SharedPtr
JMutexAutoLock * getLock()
{
return new JMutexAutoLock(m_mutex);
}
// You pretty surely want to grab the lock when accessing this
T m_value;
private:
JMutex m_mutex;
};
/*
A single worker thread - multiple client threads queue framework.
*/
template<typename Key, typename T, typename Caller, typename CallerData>
class GetResult
{
public:
Key key;
T item;
std::pair<Caller, CallerData> caller;
};
template<typename Key, typename T, typename Caller, typename CallerData>
class ResultQueue: public MutexedQueue< GetResult<Key, T, Caller, CallerData> >
{
};
template<typename Caller, typename Data, typename Key, typename T>
class CallerInfo
{
public:
Caller caller;
Data data;
ResultQueue< Key, T, Caller, Data>* dest;
};
template<typename Key, typename T, typename Caller, typename CallerData>
class GetRequest
{
public:
GetRequest()
{
}
GetRequest(Key a_key)
{
key = a_key;
}
~GetRequest()
{
}
Key key;
std::list<CallerInfo<Caller, CallerData, Key, T> > callers;
};
/**
* Notes for RequestQueue usage
* @param Key unique key to identify a request for a specific resource
* @param T ?
* @param Caller unique id of calling thread
* @param CallerData data passed back to caller
*/
template<typename Key, typename T, typename Caller, typename CallerData>
class RequestQueue
{
public:
bool empty()
{
return m_queue.empty();
}
void add(Key key, Caller caller, CallerData callerdata,
ResultQueue<Key, T, Caller, CallerData> *dest)
{
{
JMutexAutoLock lock(m_queue.getMutex());
/*
If the caller is already on the list, only update CallerData
*/
for(typename std::list< GetRequest<Key, T, Caller, CallerData> >::iterator
i = m_queue.getList().begin();
i != m_queue.getList().end(); ++i)
{
GetRequest<Key, T, Caller, CallerData> &request = *i;
if(request.key == key)
{
for(typename std::list< CallerInfo<Caller, CallerData, Key, T> >::iterator
i = request.callers.begin();
i != request.callers.end(); ++i)
{
CallerInfo<Caller, CallerData, Key, T> &ca = *i;
if(ca.caller == caller)
{
ca.data = callerdata;
return;
}
}
CallerInfo<Caller, CallerData, Key, T> ca;
ca.caller = caller;
ca.data = callerdata;
ca.dest = dest;
request.callers.push_back(ca);
return;
}
}
}
/*
Else add a new request to the queue
*/
GetRequest<Key, T, Caller, CallerData> request;
request.key = key;
CallerInfo<Caller, CallerData, Key, T> ca;
ca.caller = caller;
ca.data = callerdata;
ca.dest = dest;
request.callers.push_back(ca);
m_queue.push_back(request);
}
GetRequest<Key, T, Caller, CallerData> pop(unsigned int timeout_ms)
{
return m_queue.pop_front(timeout_ms);
}
GetRequest<Key, T, Caller, CallerData> pop()
{
return m_queue.pop_frontNoEx();
}
void pushResult(GetRequest<Key, T, Caller, CallerData> req,
T res) {
for(typename std::list< CallerInfo<Caller, CallerData, Key, T> >::iterator
i = req.callers.begin();
i != req.callers.end(); ++i)
{
CallerInfo<Caller, CallerData, Key, T> &ca = *i;
GetResult<Key,T,Caller,CallerData> result;
result.key = req.key;
result.item = res;
result.caller.first = ca.caller;
result.caller.second = ca.data;
ca.dest->push_back(result);
}
}
private:
MutexedQueue< GetRequest<Key, T, Caller, CallerData> > m_queue;
};
#endif
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