4 * Copyright 2001 The LyX Team
7 * \author Asger Alstrup Nielsen
8 * \author Angus Leeming
10 * A class for the control of child processes launched using
11 * fork() and execvp().
19 #include <boost/signals/signal0.hpp>
20 #include <boost/signals/trackable.hpp>
22 #include <sys/types.h> // needed for pid_t
34 class ForkedcallsController : public boost::signals::trackable {
36 /// We need this to avoid warnings.
37 ForkedcallsController();
38 /** This d-tor should really be private, but making it public
39 * allows egcs 1.1 to compile the class.
41 ~ForkedcallsController();
43 /// Get hold of the only controller that can exist inside the process.
44 static ForkedcallsController & get();
46 /// Add a new child process to the list of controlled processes.
47 void addCall(Forkedcall const & newcall);
49 /** This method is connected to the timer. Every XX ms it is called
50 * so that we can check on the status of the children. Those that
51 * are found to have finished are removed from the list and their
52 * callback function is passed the final return state.
56 /// Return a vector of the pids of all the controlled processes.
57 std::vector<pid_t> const getPIDs() const;
59 /// Get the command string of the process.
60 string const getCommand(pid_t) const;
62 /** Kill this process prematurely and remove it from the list.
63 * The process is killed within tolerance secs.
64 * See forkedcall.[Ch] for details.
66 void kill(pid_t, int tolerance = 5);
68 /// Signal emitted when the list of current child processes changes.
69 boost::signal0<void> childrenChanged;
73 ForkedcallsController(ForkedcallsController const &);
75 /// The child processes
76 typedef std::list<Forkedcall *> ListType;
80 /** The timer. Enables us to check the status of the children
81 * every XX ms and to invoke a callback on completion.
86 #endif // FORKEDCONTR_H