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/* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD 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.
* OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file linkgraphschedule.cpp Definition of link graph schedule used for cargo distribution. */
#include "../stdafx.h"
#include "linkgraphschedule.h"
#include "init.h"
#include "demands.h"
#include "mcf.h"
#include "flowmapper.h"
/**
* Spawn a thread if possible and run the link graph job in the thread. If
* that's not possible run the job right now in the current thread.
* @param job Job to be executed.
*/
void LinkGraphSchedule::SpawnThread(LinkGraphJob *job)
{
if (!ThreadObject::New(&(LinkGraphSchedule::Run), job, &job->thread)) {
job->thread = NULL;
/* Of course this will hang a bit.
* On the other hand, if you want to play games which make this hang noticably
* on a platform without threads then you'll probably get other problems first.
* OK:
* If someone comes and tells me that this hangs for him/her, I'll implement a
* smaller grained "Step" method for all handlers and add some more ticks where
* "Step" is called. No problem in principle.
*/
LinkGraphSchedule::Run(job);
}
}
/**
* Join the calling thread with the given job's thread if threading is enabled.
* @param job Job whose execution thread is to be joined.
*/
void LinkGraphSchedule::JoinThread(LinkGraphJob *job)
{
if (job->thread != NULL) {
job->thread->Join();
delete job->thread;
job->thread = NULL;
}
}
/**
* Start the next job in the schedule.
*/
void LinkGraphSchedule::SpawnNext()
{
if (this->schedule.empty()) return;
LinkGraph *next = this->schedule.front();
assert(next == LinkGraph::Get(next->index));
this->schedule.pop_front();
if (LinkGraphJob::CanAllocateItem()) {
LinkGraphJob *job = new LinkGraphJob(*next);
this->SpawnThread(job);
this->running.push_back(job);
} else {
NOT_REACHED();
}
}
/**
* Join the next finished job, if available.
*/
void LinkGraphSchedule::JoinNext()
{
if (this->running.empty()) return;
LinkGraphJob *next = this->running.front();
if (!next->IsFinished()) return;
this->running.pop_front();
LinkGraphID id = next->LinkGraphIndex();
this->JoinThread(next);
delete next;
if (LinkGraph::IsValidID(id)) {
LinkGraph *lg = LinkGraph::Get(id);
this->Unqueue(lg); // Unqueue to avoid double-queueing recycled IDs.
this->Queue(lg);
}
}
/**
* Run all handlers for the given Job. This method is tailored to
* ThreadObject::New.
* @param j Pointer to a link graph job.
*/
/* static */ void LinkGraphSchedule::Run(void *j)
{
LinkGraphJob *job = (LinkGraphJob *)j;
LinkGraphSchedule *schedule = LinkGraphSchedule::Instance();
for (uint i = 0; i < lengthof(schedule->handlers); ++i) {
schedule->handlers[i]->Run(*job);
}
}
/**
* Start all threads in the running list. This is only useful for save/load.
* Usually threads are started when the job is created.
*/
void LinkGraphSchedule::SpawnAll()
{
for (JobList::iterator i = this->running.begin(); i != this->running.end(); ++i) {
this->SpawnThread(*i);
}
}
/**
* Clear all link graphs and jobs from the schedule.
*/
/* static */ void LinkGraphSchedule::Clear()
{
LinkGraphSchedule *inst = LinkGraphSchedule::Instance();
for (JobList::iterator i(inst->running.begin()); i != inst->running.end(); ++i) {
inst->JoinThread(*i);
}
inst->running.clear();
inst->schedule.clear();
}
/**
* Create a link graph schedule and initialize its handlers.
*/
LinkGraphSchedule::LinkGraphSchedule()
{
this->handlers[0] = new InitHandler;
this->handlers[1] = new DemandHandler;
this->handlers[2] = new MCFHandler<MCF1stPass>;
this->handlers[3] = new FlowMapper;
this->handlers[4] = new MCFHandler<MCF2ndPass>;
this->handlers[5] = new FlowMapper;
}
/**
* Delete a link graph schedule and its handlers.
*/
LinkGraphSchedule::~LinkGraphSchedule()
{
this->Clear();
for (uint i = 0; i < lengthof(this->handlers); ++i) {
delete this->handlers[i];
}
}
/**
* Retrieve the link graph schedule or create it if necessary.
*/
/* static */ LinkGraphSchedule *LinkGraphSchedule::Instance()
{
static LinkGraphSchedule inst;
return &inst;
}
/**
* Spawn or join a link graph job or compress a link graph if any link graph is
* due to do so.
*/
void OnTick_LinkGraph()
{
if (_date_fract != LinkGraphSchedule::SPAWN_JOIN_TICK) return;
Date offset = _date % _settings_game.linkgraph.recalc_interval;
if (offset == 0) {
LinkGraphSchedule::Instance()->SpawnNext();
} else if (offset == _settings_game.linkgraph.recalc_interval / 2) {
LinkGraphSchedule::Instance()->JoinNext();
}
}
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