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/*
* Copyright (C) 2005-2013 Team XBMC
* http://xbmc.org
*
* 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; either version 2, 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with XBMC; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include "CallbackHandler.h"
#include "AddonUtils.h"
#include "threads/SingleLock.h"
#include <vector>
#include "commons/Exception.h"
namespace XBMCAddon
{
class AsynchCallbackMessage : public AddonClass
{
public:
AddonClass::Ref<Callback> cb;
AddonClass::Ref<RetardedAsynchCallbackHandler> handler;
AsynchCallbackMessage(Callback* _cb, RetardedAsynchCallbackHandler* _handler) :
cb(_cb), handler(_handler) { XBMC_TRACE; }
};
//********************************************************************
// This holds the callback messages which will be executed. It doesn't
// seem to work correctly with the Ref object so we'll go with Ref*'s
typedef std::vector<AddonClass::Ref<AsynchCallbackMessage> > CallbackQueue;
//********************************************************************
static CCriticalSection critSection;
static CallbackQueue g_callQueue;
void RetardedAsynchCallbackHandler::invokeCallback(Callback* cb)
{
XBMC_TRACE;
CSingleLock lock(critSection);
g_callQueue.push_back(new AsynchCallbackMessage(cb,this));
}
RetardedAsynchCallbackHandler::~RetardedAsynchCallbackHandler()
{
XBMC_TRACE;
CSingleLock lock(critSection);
// find any messages that might be there because of me ... and remove them
CallbackQueue::iterator iter = g_callQueue.begin();
while (iter != g_callQueue.end())
{
AddonClass::Ref<AsynchCallbackMessage> cur(*iter);
{
if (cur->handler.get() == this) // then this message is because of me
{
g_callQueue.erase(iter);
iter = g_callQueue.begin();
}
else
++iter;
}
}
}
void RetardedAsynchCallbackHandler::makePendingCalls()
{
XBMC_TRACE;
CSingleLock lock(critSection);
CallbackQueue::iterator iter = g_callQueue.begin();
while (iter != g_callQueue.end())
{
AddonClass::Ref<AsynchCallbackMessage> p(*iter);
// only call when we are in the right thread state
if(p->handler->isStateOk(p->cb->getObject()))
{
// remove it from the queue. No matter what we're done with
// this. Even if it doesn't execute for some reason.
g_callQueue.erase(iter);
// we need to release the critSection lock prior to grabbing the
// lock on the object. Not doing so results in deadlocks. We no
// longer are accessing the g_callQueue so it's fine to do this now
{
XBMCAddonUtils::InvertSingleLockGuard unlock(lock);
// make sure the object is not deallocating
// we need to grab the object lock to see if the object of the call
// is deallocating. holding this lock should prevent it from
// deallocating durring the execution of this call.
#ifdef ENABLE_XBMC_TRACE_API
CLog::Log(LOGDEBUG,"%sNEWADDON executing callback 0x%lx",_tg.getSpaces(),(long)(p->cb.get()));
#endif
AddonClass* obj = (p->cb->getObject());
AddonClass::Ref<AddonClass> ref(obj);
CSingleLock lock2(*obj);
if (!p->cb->getObject()->isDeallocating())
{
try
{
// need to make the call
p->cb->executeCallback();
}
catch (XbmcCommons::Exception& e) { e.LogThrowMessage(); }
catch (...)
{
CLog::Log(LOGERROR,"Unknown exception while executeing callback 0x%lx", (long)(p->cb.get()));
}
}
}
// since the state of the iterator may have been corrupted by
// the changing state of the list from another thread durring
// the releasing fo the lock in the immediately preceeding
// codeblock, we need to reset it before continuing the loop
iter = g_callQueue.begin();
}
else // if we're not in the right thread for this callback...
++iter;
}
}
void RetardedAsynchCallbackHandler::clearPendingCalls(void* userData)
{
XBMC_TRACE;
CSingleLock lock(critSection);
CallbackQueue::iterator iter = g_callQueue.begin();
while (iter != g_callQueue.end())
{
AddonClass::Ref<AsynchCallbackMessage> p(*iter);
if(p->handler->shouldRemoveCallback(p->cb->getObject(),userData))
{
#ifdef ENABLE_XBMC_TRACE_API
CLog::Log(LOGDEBUG,"%sNEWADDON removing callback 0x%lx for PyThreadState 0x%lx from queue", _tg.getSpaces(),(long)(p->cb.get()) ,(long)userData);
#endif
iter = g_callQueue.erase(iter);
}
else
++iter;
}
}
}
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