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b049f3997a
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@9197 a592a061-630c-0410-9148-cb99ea01b6c8
90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
// -*- C++ -*-
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/**
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* \file forkedcontr.h
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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 Asger Alstrup Nielsen
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* \author 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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* A class for the control of child processes launched using
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* fork() and execvp().
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*/
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#ifndef FORKEDCONTR_H
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#define FORKEDCONTR_H
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#include <boost/shared_ptr.hpp>
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#include <csignal>
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//#include <sys/types.h> // needed for pid_t
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#include <list>
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#include <vector>
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namespace lyx {
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namespace support {
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class ForkedProcess;
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class ForkedcallsController {
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public:
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/// Get hold of the only controller that can exist inside the process.
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static ForkedcallsController & get();
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/// Are there any completed child processes to be cleaned-up after?
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bool processesCompleted() const { return current_child != -1; }
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/** Those child processes that are found to have finished are removed
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* from the list and their callback function is passed the final
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* return state.
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*/
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void handleCompletedProcesses();
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/// Add a new child process to the list of controlled processes.
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void addCall(ForkedProcess const &);
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/** Kill this process prematurely and remove it from the list.
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* The process is killed within tolerance secs.
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* See forkedcall.[Ch] for details.
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*/
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void kill(pid_t, int tolerance = 5);
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struct Data {
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Data() : pid(0), status(0) {}
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pid_t pid;
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int status;
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};
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/** These data are used by the SIGCHLD handler to populate a list
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* of child processes that have completed and been reaped.
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* The associated signals are then emitted within the main LyX
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* event loop.
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*/
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std::vector<Data> reaped_children;
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sig_atomic_t current_child;
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private:
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ForkedcallsController();
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ForkedcallsController(ForkedcallsController const &);
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~ForkedcallsController();
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typedef boost::shared_ptr<ForkedProcess> ForkedProcessPtr;
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typedef std::list<ForkedProcessPtr> ListType;
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typedef ListType::iterator iterator;
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iterator find_pid(pid_t);
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/// The child processes
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ListType forkedCalls;
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/// Used to block SIGCHLD signals.
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sigset_t newMask, oldMask;
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};
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} // namespace support
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} // namespace lyx
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#endif // FORKEDCONTR_H
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