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91 lines
1.7 KiB
C++
91 lines
1.7 KiB
C++
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/**
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* \file forkedcallqueue.C
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Alfredo Braunstein (based on an idea from Angus Leeming)
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*
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* Full author contact details are available in file CREDITS
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*/
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#include "forkedcallqueue.h"
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#include "debug.h"
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#include <boost/bind.hpp>
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#include <boost/signals/signal2.hpp>
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using std::endl;
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using std::queue;
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ForkedCallQueue & ForkedCallQueue::get()
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{
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static ForkedCallQueue singleton;
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return singleton;
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}
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Forkedcall::SignalTypePtr ForkedCallQueue::add(string const & process)
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{
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Forkedcall::SignalTypePtr ptr;
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ptr.reset(new Forkedcall::SignalType);
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callQueue_.push(Process(process, ptr));
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if (!running_) {
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startCaller();
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}
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return ptr;
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}
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void ForkedCallQueue::callNext()
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{
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if (callQueue_.empty())
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return;
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Process pro = callQueue_.front();
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callQueue_.pop();
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// Bind our chain caller
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pro.second->connect(boost::bind(&ForkedCallQueue::callback,
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this, _1, _2));
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Forkedcall call;
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//<2F>If<49>we<77>fail<69>to<74>fork<72>the<68>process,<2C>then<65>emit<69>the<68>signal
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//<2F>to<74>tell<6C>the<68>outside<64>world<6C>that<61>it<69>failed.
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if (call.startscript(pro.first, pro.second) > 0) {
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pro.second->operator()(0,1);
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}
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}
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void ForkedCallQueue::callback(pid_t, int)
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{
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if(callQueue_.empty()) {
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stopCaller();
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} else {
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callNext();
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}
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}
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ForkedCallQueue::ForkedCallQueue() : running_(false)
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{}
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void ForkedCallQueue::startCaller()
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{
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lyxerr[Debug::GRAPHICS] << "ForkedCallQueue: waking up" << endl;
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running_ = true ;
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callNext();
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}
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void ForkedCallQueue::stopCaller()
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{
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running_ = false ;
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lyxerr[Debug::GRAPHICS] << "ForkedCallQueue: I'm going to sleep"
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<< endl;
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}
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bool ForkedCallQueue::running() const
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{
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return running_ ;
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}
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