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ThreadPool.cpp
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ThreadPool.cpp
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/*************************************************************************
* UrBackup - Client/Server backup system
* Copyright (C) 2011-2014 Martin Raiber
*
* 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 3 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
**************************************************************************/
#include "Interface/Thread.h"
#include "ThreadPool.h"
#include "Server.h"
#include "stringtools.h"
const unsigned int max_waiting_threads=2;
CPoolThread::CPoolThread(CThreadPool *pMgr)
{
mgr=pMgr;
dexit=false;
}
void CPoolThread::operator()(void)
{
THREAD_ID tid = Server->getThreadID();
THREADPOOL_TICKET ticket;
bool stop=false;
IThread *tr=mgr->getRunnable(&ticket, false, stop);
if(tr!=NULL)
{
(*tr)();
Server->clearDatabases(tid);
}
if(!stop)
{
while(dexit==false)
{
stop=false;
IThread *tr=mgr->getRunnable(&ticket, true, stop);
if(tr!=NULL)
{
(*tr)();
Server->clearDatabases(tid);
}
else if(stop)
{
break;
}
}
}
Server->destroyDatabases(tid);
mgr->Remove(this);
delete this;
}
void CPoolThread::shutdown(void)
{
dexit=true;
}
IThread * CThreadPool::getRunnable(THREADPOOL_TICKET *todel, bool del, bool& stop)
{
IScopedLock lock(mutex);
if( del==true )
{
--nRunning;
std::map<THREADPOOL_TICKET, ICondition *>::iterator it=running.find(*todel);
if( it!=running.end() )
{
if( it->second!=NULL )
it->second->notify_all();
running.erase(it);
}
}
IThread *ret=NULL;
while(ret==NULL && dexit==false)
{
if( toexecute.size()==0)
{
if(nThreads-nRunning>max_waiting_threads)
{
stop=true;
return NULL;
}
cond->wait(&lock);
}
else
{
ret=toexecute[0].first;
*todel=toexecute[0].second;
toexecute.erase( toexecute.begin() );
}
}
return ret;
}
void CThreadPool::Remove(CPoolThread *pt)
{
IScopedLock lock(mutex);
for(size_t i=0;i<threads.size();++i)
{
if( threads[i]==pt )
{
threads.erase( threads.begin()+i);
--nThreads;
return;
}
}
}
CThreadPool::CThreadPool()
{
nRunning=0;
nThreads=0;
currticket=0;
dexit=false;
mutex=Server->createMutex();
cond=Server->createCondition();
}
CThreadPool::~CThreadPool()
{
delete mutex;
delete cond;
}
void CThreadPool::Shutdown(void)
{
bool do_leak_check=(Server->getServerParameter("leak_check")=="true");
IScopedLock lock(mutex);
for(size_t i=0;i<threads.size();++i)
{
threads[i]->shutdown();
}
dexit=true;
unsigned int max=0;
while(threads.size()>0 )
{
lock.relock(NULL);
cond->notify_all();
Server->wait(100);
lock.relock(mutex);
//wait for max 300 msec
if( (!do_leak_check && max>=3) || (do_leak_check && max>=30) )
{
Server->Log("Maximum wait time for thread pool exceeded. Shutting down the hard way", LL_ERROR);
break;
}
++max;
}
}
bool CThreadPool::isRunningInt(THREADPOOL_TICKET ticket)
{
std::map<THREADPOOL_TICKET, ICondition*>::iterator it=running.find(ticket);
if( it!=running.end() )
return true;
else
return false;
}
bool CThreadPool::isRunning(THREADPOOL_TICKET ticket)
{
IScopedLock lock(mutex);
return isRunningInt(ticket);
}
bool CThreadPool::waitFor(std::vector<THREADPOOL_TICKET> tickets, int timems)
{
int64 starttime;
if(timems>=0)
{
starttime = Server->getTimeMS();
}
IScopedLock lock(mutex);
ICondition *cond=Server->createCondition();
for( size_t i=0;i<tickets.size();++i)
{
std::map<THREADPOOL_TICKET, ICondition*>::iterator it=running.find(tickets[i]);
if( it!=running.end() )
{
it->second=cond;
}
}
bool ret=false;
while(true)
{
bool r=false;
for(size_t i=0;i<tickets.size();++i)
{
if( isRunningInt(tickets[i]) )
{
r=true;
break;
}
}
if( r==false )
{
ret = true;
break;
}
cond->wait(&lock, timems);
if(timems>=0)
{
int64 ctime = Server->getTimeMS();
if(ctime-starttime>timems)
{
break;
}
}
}
for( size_t i=0;i<tickets.size();++i)
{
std::map<THREADPOOL_TICKET, ICondition*>::iterator it=running.find(tickets[i]);
if( it!=running.end() )
{
if(it->second==cond)
{
it->second=NULL;
}
}
}
Server->destroy(cond);
return ret;
}
THREADPOOL_TICKET CThreadPool::execute(IThread *runnable)
{
IScopedLock lock(mutex);
if( nThreads-nRunning==0 )
{
CPoolThread *nt=new CPoolThread(this);
Server->createThread(nt);
++nThreads;
threads.push_back(nt);
}
toexecute.push_back(std::pair<IThread*, THREADPOOL_TICKET>(runnable, ++currticket) );
running.insert(std::pair<THREADPOOL_TICKET, ICondition*>(currticket, (ICondition*)NULL) );
++nRunning;
cond->notify_one();
return currticket;
}
void CThreadPool::executeWait(IThread *runnable)
{
THREADPOOL_TICKET ticket=execute(runnable);
waitFor(ticket);
}
bool CThreadPool::waitFor(THREADPOOL_TICKET ticket, int timems)
{
std::vector<THREADPOOL_TICKET> t;
t.push_back(ticket);
return waitFor(t, timems);
}