/* * Copyright (C) 2003-2005 by the gtk2-perl team (see the file AUTHORS for * the full list) * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Library General Public License as published by * the Free Software Foundation; either version 2.1 of the License, or (at your * option) any later version. * * This library 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 Library General Public * License for more details. * * You should have received a copy of the GNU Library General Public License * along with this library; if not, write to the Free Software Foundation, * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307 USA. * * $Header: /cvsroot/gtk2-perl/gtk2-perl-xs/Glib/GMainLoop.xs,v 1.21 2006/08/07 18:17:18 kaffeetisch Exp $ */ #include "gperl.h" /* stuff from gmain.h, the main loop and friends */ /* GMainLoop is in libglib; GClosure is in libgobject. the mainloop can't refer to GClosure for dependency reasons, but the code is designed to be used with GClosure anyway. that's what we'll do here. specifically, GSourceDummyMarshal is just a placeholder for GClosureMarshal. since we have GClosure implemented in GClosure.xs, we'll use it to handle the callbacks here. in the more general sense, this file offers the GLib-level interface to the main loop stuff wrapped by the Gtk2 module. at the current point, i can't think of any reason to expose the lower-level main loop stuff here, because how many apps are going to be using the event loop without Gtk? then again, it's quite conceivable that you'd want to do that, so it's not precluded (just not done). if you want to implement the main loop stuff here, you'll need to create typemaps for these types: GMainContext <- Opaque GMainLoop <- Opaque and you'll need to typemap these if you want to create custom sources from perl: GSource GSourceCallbackFuncs GSourceFuncs as far as i can tell, each of these is a ref-counted object, but none are GObject or GBoxed descendents (as they are part of glib, not gobject!). for anyone who needs to implement this stuff, i've left the majority of gmain.h in here, commented out. */ /* * Since 5.7.3, perl uses "safe" signal handling by default. * (As gtk2-perl requires at least 5.8.0, this is relevant to us.) * To protect the interpreter from having signal handlers run during * important and otherwise uninterruptible operations, when something * is installed in %SIG, perl installs a sigaction handler that simply * sets a flag saying that a signal is pending; then, at "strategic" * points in later operation, it checks that flag. This is done using * the PERL_ASYNC_CHECK() macro after each op. * * This is important, because while a glib main loop is running, it generally * sleeps in a poll(), and control does not normally return to perl. That * causes pending signals to pile up, and looks to the user as though the * signals are being ignored. * * To solve this, the bindings will always install an event source which * watches PL_sig_pending, and calls the PERL_ASYNC_CHECK() macro whenever * we see it go true. Since an async signal will wake up a poll(), this * will always run at just the right time, so no delays or other performance * penalties result. * * Thanks to Jan Hudec for the implementation idea: * http://mail.gnome.org/archives/gtk-perl-list/2004-December/msg00034.html */ static gboolean async_watcher_prepare (GSource * source, gint * timeout) { PERL_UNUSED_VAR (source); /* wait as long as you like. we rely on the fact that the * poll will be awoken by the receipt of an async signal. */ *timeout = -1; return FALSE; } static gboolean async_watcher_check (GSource * source) { PERL_UNUSED_VAR (source); return PL_sig_pending; } static gboolean async_watcher_dispatch (GSource * source, GSourceFunc callback, gpointer user_data) { PERL_UNUSED_VAR (source); PERL_UNUSED_VAR (callback); PERL_UNUSED_VAR (user_data); /* this checks PL_sig_pending again, but that's probably not * a bad thing -- it's conceivable that since the check, some * other handler has triggered a perl callback, which would've * cause perl to dispatch the signal handlers, and if we didn't * recheck here we'd redispatch. */ PERL_ASYNC_CHECK (); return TRUE; } static void async_watcher_install (void) { static GSourceFuncs async_watcher_funcs = { async_watcher_prepare, async_watcher_check, async_watcher_dispatch, NULL }; /* FIXME: we never unref the watcher. */ GSource * async_watcher = g_source_new (&async_watcher_funcs, sizeof (GSource)); g_source_attach (async_watcher, NULL); } MODULE = Glib::MainLoop PACKAGE = Glib PREFIX = g_ BOOT: async_watcher_install (); =for object Glib::MainLoop =cut #if GLIB_CHECK_VERSION(2,4,0) =for apidoc __function__ Find the current main loop recursion level. This is handy in fringe situations, but those are very rare; see the C API reference for a more in-depth discussion. =cut int g_main_depth () #endif MODULE = Glib::MainLoop PACKAGE = Glib::MainContext PREFIX = g_main_context_ =for object Glib::MainLoop An event source manager =cut =for position DESCRIPTION =head1 DESCRIPTION Event-driven programs need some sort of loop which watches for events and launches the appropriate actions. Glib::MainLoop provides this functionality. Mainloops have context, provided by the MainContext object. For the most part you can use the default context (see C), but if you want to create a subcontext for a nested loop which doesn't have the same event sources, etc, you can. Event sources, attached to main contexts, watch for events to happen, and launch appropriate actions. Glib provides a few ready-made event sources, the Glib::Timeout, Glib::Idle, and io watch (C<< Glib::IO->add_watch >>). Under the hood, Gtk+ adds event sources for GdkEvents to dispatch events to your widgets. In fact, Gtk2 provides an abstraction of Glib::MainLoop (See C<< Gtk2->main >> and friends), so you may rarely have cause to use Glib::MainLoop directly. Note: As of version 1.080, the Glib module uses a custom event source to ensure that perl's safe signal handling and the glib polling event loop play nicely together. It is no longer necessary to install a timeout to ensure that async signals get handled in a timely manner. =cut ##################### ### GMainContext: ### ##################### GMainContext * g_main_context_new (class) C_ARGS: /*void*/ CLEANUP: g_main_context_unref (RETVAL); /* release the typemap's ref, so the wrapper owns the object */ void DESTROY (maincontext) GMainContext * maincontext CODE: g_main_context_unref (maincontext); ## these are automatic, now ##void g_main_context_ref (GMainContext *context); ##void g_main_context_unref (GMainContext *context); GMainContext * g_main_context_default (class) C_ARGS: /*void*/ gboolean g_main_context_iteration (GMainContext *context, gboolean may_block); gboolean g_main_context_pending (GMainContext *context); ##/* For implementation of legacy interfaces */ ##GSource *g_main_context_find_source_by_id (GMainContext *context, ## guint source_id); ##GSource *g_main_context_find_source_by_user_data (GMainContext *context, ## gpointer user_data); ##GSource *g_main_context_find_source_by_funcs_user_data (GMainContext *context, ## GSourceFuncs *funcs, ## gpointer user_data); ##/* Low level functions for implementing custom main loops. */ ##void g_main_context_wakeup (GMainContext *context); ##gboolean g_main_context_acquire (GMainContext *context); ##void g_main_context_release (GMainContext *context); ##gboolean g_main_context_wait (GMainContext *context, ## GCond *cond, ## GMutex *mutex); ## ##gboolean g_main_context_prepare (GMainContext *context, ## gint *priority); ##gint g_main_context_query (GMainContext *context, ## gint max_priority, ## gint *timeout_, ## GPollFD *fds, ## gint n_fds); ##gint g_main_context_check (GMainContext *context, ## gint max_priority, ## GPollFD *fds, ## gint n_fds); ##void g_main_context_dispatch (GMainContext *context); ## ##void g_main_context_set_poll_func (GMainContext *context, ## GPollFunc func); ##GPollFunc g_main_context_get_poll_func (GMainContext *context); ## ##/* Low level functions for use by source implementations */ ##void g_main_context_add_poll (GMainContext *context, ## GPollFD *fd, ## gint priority); ##void g_main_context_remove_poll (GMainContext *context, ## GPollFD *fd); MODULE = Glib::MainLoop PACKAGE = Glib::MainLoop PREFIX = g_main_loop_ ################## ### GMainLoop: ### ################## ## the OUTPUT typemap for GMainLoop* takes a ref on the object, and the ## DESTROY method for the wrapper releases it. g_main_loop_new returns ## a new object that is to be owned by the wrapper, so it releases the ## typemap's reference in the CLEANUP section. ##GMainLoop *g_main_loop_new (GMainContext *context, gboolean is_running); GMainLoop * g_main_loop_new (class, context=NULL, is_running=FALSE) GMainContext *context gboolean is_running C_ARGS: context, is_running CLEANUP: g_main_loop_unref (RETVAL); void DESTROY (mainloop) GMainLoop * mainloop CODE: g_main_loop_unref (mainloop); void g_main_loop_run (GMainLoop *loop); void g_main_loop_quit (GMainLoop *loop); ## see above, these are taken care of for you ##GMainLoop *g_main_loop_ref (GMainLoop *loop); ##void g_main_loop_unref (GMainLoop *loop); gboolean g_main_loop_is_running (GMainLoop * loop); GMainContext * g_main_loop_get_context (GMainLoop * loop); ### NOTE: stuff behind G_DISABLE_DEPRECATED shall not be bound. ### i've left their declarations here as a reminder that we didn't ### forget them, they're just not supposed to be included. ### ##/* ============== Compat main loop stuff ================== */ ## ###ifndef G_DISABLE_DEPRECATED ## ##/* Legacy names for GMainLoop functions */ ###define g_main_new(is_running) g_main_loop_new (NULL, is_running); ###define g_main_run(loop) g_main_loop_run(loop) ###define g_main_quit(loop) g_main_loop_quit(loop) ###define g_main_destroy(loop) g_main_loop_unref(loop) ###define g_main_is_running(loop) g_main_loop_is_running(loop) ## ##/* Functions to manipulate the default main loop */ ## ###define g_main_iteration(may_block) g_main_context_iteration (NULL, may_block) ###define g_main_pending() g_main_context_pending (NULL) ## ###define g_main_set_poll_func(func) g_main_context_set_poll_func (NULL, func) ## ###endif /* G_DISABLE_DEPRECATED */ MODULE = Glib::MainLoop PACKAGE = Glib::Source PREFIX = g_source_ =for object Glib::MainLoop =cut ################ ### GSource: ### ################ ##GSource *g_source_new (GSourceFuncs *source_funcs, ## guint struct_size); ##GSource *g_source_ref (GSource *source); ##void g_source_unref (GSource *source); ##guint g_source_attach (GSource *source, ## GMainContext *context); ##void g_source_destroy (GSource *source); ##void g_source_set_priority (GSource *source, ## gint priority); ##gint g_source_get_priority (GSource *source); ##void g_source_set_can_recurse (GSource *source, ## gboolean can_recurse); ##gboolean g_source_get_can_recurse (GSource *source); ##guint g_source_get_id (GSource *source); ## ##GMainContext *g_source_get_context (GSource *source); ## ##void g_source_set_callback (GSource *source, ## GSourceFunc func, ## gpointer data, ## GDestroyNotify notify); ##void g_source_add_poll (GSource *source, ## GPollFD *fd); ##void g_source_remove_poll (GSource *source, ## GPollFD *fd); ## ##void g_source_get_current_time (GSource *source, ## GTimeVal *timeval); ## ##/* Specific source types */ ##GSource *g_idle_source_new (void); ##GSource *g_timeout_source_new (guint interval); ##/* Miscellaneous functions ## */ ##void g_get_current_time (GTimeVal *result); =for apidoc Remove an event source. I<$tag> is the number returned by things like C<< Glib::Timeout->add >>, C<< Glib::Idle->add >>, and C<< Glib::IO->add_watch >>. =cut gboolean g_source_remove (class, tag) guint tag C_ARGS: tag ##gboolean g_source_remove_by_user_data (gpointer user_data); ##gboolean g_source_remove_by_funcs_user_data (GSourceFuncs *funcs, ## gpointer user_data); MODULE = Glib::MainLoop PACKAGE = Glib::Timeout PREFIX = g_timeout_ =for object Glib::MainLoop =cut ########################## ### Idles and timeouts ### ########################## =for apidoc =for arg interval number of milliseconds =for arg callback (subroutine) Run I<$callback> every I<$interval> milliseconds until I<$callback> returns false. Returns a source id which may be used with C<< Glib::Source->remove >>. Note that a mainloop must be active for the timeout to execute. =cut guint g_timeout_add (class, interval, callback, data=NULL, priority=G_PRIORITY_DEFAULT) guint interval SV * callback SV * data gint priority PREINIT: GClosure * closure; GSource * source; CODE: closure = gperl_closure_new (callback, data, FALSE); source = g_timeout_source_new (interval); if (priority != G_PRIORITY_DEFAULT) g_source_set_priority (source, priority); g_source_set_closure (source, closure); RETVAL = g_source_attach (source, NULL); g_source_unref (source); OUTPUT: RETVAL MODULE = Glib::MainLoop PACKAGE = Glib::Idle PREFIX = g_idle_ =for object Glib::MainLoop =cut =for apidoc =for arg callback (subroutine) Run I<$callback> when the mainloop is idle. If I<$callback> returns false, it will uninstall itself, otherwise, it will run again at the next idle iteration. Returns a source id which may be used with C<< Glib::Source->remove >>. =cut guint g_idle_add (class, callback, data=NULL, priority=G_PRIORITY_DEFAULT_IDLE) SV * callback SV * data gint priority PREINIT: GClosure * closure; GSource * source; CODE: closure = gperl_closure_new (callback, data, FALSE); source = g_idle_source_new (); g_source_set_priority (source, priority); g_source_set_closure (source, closure); RETVAL = g_source_attach (source, NULL); g_source_unref (source); OUTPUT: RETVAL ### FIXME i'm not sure about how to search for the data if we set SVs there. ##gboolean g_idle_remove_by_data (gpointer data); MODULE = Glib::MainLoop PACKAGE = Glib::IO PREFIX = g_io_ =for object Glib::MainLoop =cut BOOT: gperl_register_fundamental (G_TYPE_IO_CONDITION, "Glib::IOCondition"); =for enum Glib::IOCondition =cut =for apidoc =for arg fd (file descriptor) file number, e.g. fileno($filehandle) =for arg callback (subroutine) Run I<$callback> when there is an event on I<$fd> that matches I<$condition>. The watch uninstalls itself if I<$callback> returns false. Returns a source id that may be used with C<< Glib::Source->remove >>. Glib's IO channels serve the same basic purpose as Perl's file handles, so for the most part you don't see GIOChannels in Perl. The IO watch integrates IO operations with the main loop, which Perl file handles don't do. For various reasons, this function requires raw file descriptors, not full file handles. See C in L. =cut guint g_io_add_watch (class, fd, condition, callback, data=NULL, priority=G_PRIORITY_DEFAULT) int fd GIOCondition condition SV * callback SV * data gint priority PREINIT: GClosure * closure; GSource * source; GIOChannel * channel; CODE: #ifdef USE_SOCKETS_AS_HANDLES /* native win32 doesn't have fd's, so first convert perls fd into a winsock fd */ channel = g_io_channel_win32_new_socket ((HANDLE)win32_get_osfhandle (fd)); #else channel = g_io_channel_unix_new (fd); #endif /* USE_SOCKETS_AS_HANDLES */ source = g_io_create_watch (channel, condition); if (priority != G_PRIORITY_DEFAULT) g_source_set_priority (source, priority); closure = gperl_closure_new (callback, data, FALSE); g_source_set_closure (source, closure); RETVAL = g_source_attach (source, NULL); g_source_unref (source); g_io_channel_unref (channel); OUTPUT: RETVAL