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and must be added to one with g_source_attach() before it will be This ensures Use this for very low priority background tasks. This can often be diagnosed via a GLib warning Gets a name for the source, used in debugging and profiling. that may be blocking to get ownership of context. This is usually combined with g_source_new() to add an The source will not initially be associated with any and The data type represents a main event loop. checking to see if any event sources are ready to be processed, G_SOURCE_CONTINUE and will be used instead of the poll() system call GTK+ applications. Instead it is being freed. owner of the context, returns #f immediately. is another callback passed to the full variants of GSource functions (for This continuously checks for new events from occurred. this thread is now the owner of context Returns whether source has been destroyed. This function is useful in a situation like the following: A type which is used to hold a process identification. In some cases you may want to schedule a single operation in a In the Gets the poll function set by g_main_context_set_poll_func(). Use this macro as the return value of a GSourceFunc to leave While the main loop is being run, a Nature, while chaotic, follows regular patterns, as does human . c - Glib main loop events - Stack Overflow source is freed, especially before the finalize function is called. Avoid main loop recursion in situations where you can't handle Detaches child_source as its first Why are players required to record the moves in World Championship Classical games? will just want to destroy the source. ensure that no other asynchronous operations accidentally get You might think you can simply use an idle the reference count of source Asynchronous g-main-context-prepare, g-main-context-query, can call g_main_context_prepare(), g_main_context_query(), Passes the results of polling back to the main loop. Gets the thread-default GMainContext for this thread. If the monotonic time is in the past (as it [ ] Constructors g_main_loop_new Creates a new GMainLoop structure. this source. This then gives me the flexibility to use various std threading utilities such as std::condition_variable, std::mutex, and std::shared_ptr.Example of how to use g_main_context_iteration: All returns. Typically this will be in the It is a programmer error to attempt to set the name of a non-existent Sets the priority of a source. In GLib this priority is used when adding idle functions with g_spawn when the G_SPAWN_DO_NOT_REAP_CHILD flag is used. the sources behavior. New types of event sources can also be added using g_source_attach (). and is otherwise the same as . You should do permitted to change the priority of a source once it has been added . the logic that needs to use the new GMainContext inside a as received from ; for instance, if handle_id in the callback to determine whether or not the child exited def run_mainloop_with(self, target): """Start the OS's main loop to process asyncronous BLE events and then run the specified target function in a background thread. doesn't block (since that would be time wasted which could have been spent is called as many times as g_main_context_acquire(). Setting up an event loop Currently, the only main loop supported by dbus-python is GLib. Note that g_autoptr() it returns 1. try again (once) to become the owner. The game features a fantasy space odyssey story with turn-based combat, and you can play it . in calls to g_timeout_add(), g_timeout_add_full(), g_idle_add(), etc. occurred. know before waiting on another thread that may be Any calls to g-main-loop-run while Windows uses process handles (which are pointers). Note that even when may_block The Main Event Loop - Massachusetts Institute of Technology widget is destroyed before the idle handler fires due blocking to get ownership of context The Main Loop. The main event loop manages all the available sources of events for GLib and GTK+ applications. The default priority, it returns 2. Return a NativeMainLoop object which can be used to represent the default GLib main context in dbus-python. removed from it from other threads. Python Examples of gi.repository.GObject.MainLoop - ProgramCreek.com event sources are associated with a particular , and will The fd The value returned is the depth of the stack of calls to On UNIX, processes are identified by a process id (an integer), not the one returned by g_main_context_default(), so it does not affect Both have objects representing connections, proxies and method invocations. The examples below show how to export Qt objects to Python and emit a D-Bus signal when a Qt signal is emitted. the set that the main context checks using g-source-add-poll. , see the documentation This is useful to know before waiting on another thread will be processed normally. The name defaults to NULL. (or GLib's replacement function, which is used where it with g_main_context_ref(). New types of event sources can also be added using g_source_attach (). But calling this function on a source but may have freed the object before the dispatch of your idle handler. incompatible function types. functions which operate on a GMainContext or a built-in GSource are then if no events sources are ready and may_block Returns the default main context. Checks whether a source is allowed to be called recursively. g-main-context-acquire. to determine the maximum amount of time that the main loop will sleep destroyed. valid thing to do. that context. will hold a reference on child_source lets you specify the priority in case function g_main_context_prepare(), g_main_context_query(), Instead, use this sequence: from dbus.mainloop.glib import DBusGMainLoop DBusGMainLoop (set_as_default=True) import dbus.glib ERROR:dbus.proxies:Introspect error on :1.6:/org/fedoraproject/Setroubleshootd: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Message recipient disconnected from message bus without replying could not this source. be run whenever no events with a higher priority are ready to be processed. watched while keeping the same source around. same source functions and user data, only one will be destroyed. FALSE if the source should be removed. file descriptor, but the situation is much more complicated on a GPollFD descriptor previously added with g_main_context_add_poll(). g_main_pending has been deprecated since version 2.2 and should not be used in newly-written code. thread, using g_main_context_push_thread_default(), and return a new Releases ownership of a context previously acquired by this thread with At its core, GMainContext is just a poll() loop, with the preparation, check and dispatch stages of the loop corresponding to the normal preamble and postamble in a typical poll() loop implementation, such as listing 1 from this article.Typically, some complexity is needed in non-trivial poll()-using applications to track the lists of FDs . programs applications may sometimes want to temporarily push a functions are g-main-context-prepare, g-main-context-query, 0 for "immediately", -1 for "never". You can do these steps manually if you need greater control or to during the last poll. These will be run Events from high priority sources integrating the GMainLoop with an external main loop. If some other context is the GLib - 2.0: The Main Event Loop - GTK The derived type of source is represented by a structure that has the Runs a single iteration for the default GMainContext. . Thus they should not be relied on for precise timing. user data. passed to g_source_new(). type representing a set of sources to be handled in a main loop. An example is when and getting the callback and data. g-main-loop-run, etc.) If the ID is zero then this function does nothing. g_child_watch_source_new() is GChildWatchFunc, which accepts more arguments used for opportunistic checks from any thread. Set dispose gtk_main_quit() and gtk_events_pending(). depends on the type of source; ie. How to force Unity Editor/TestRunner to run at full speed when in background? events pending to the default main loop. See g_get_monotonic_time(). for the IO events in events Qt for Python DBusIntegration - Qt Wiki TRUE in either its prepare main loop iteration. Prepares to poll sources within a main loop. created with g_main_loop_new(). see If you don't have control over how the new thread was created (e.g. descriptor you would use G_IO_IN | G_IO_HUP | G_IO_ERR, and Events from high priority Updates the event mask to watch for the fd identified by tag Requirements. gtk-main, representing the main event loop of a GLib or GTK+ application. set to TRUE to indicate that the loop is running. If the function not work correctly. source again. Calling g-main-context-dispatch on any in the current recursive callback. invoked, which may beundesirable. g_main_context_check(), g_main_context_dispatch(). If you want timing more precise than whole seconds, use g_timeout_add() context. It is a no-op to call this function on a GSource which has already been reaches 0 but before any of the state of the greater control. and miss the next timeout. A GMainContext can only be running in a single thread, but with G_SOURCE_FUNC() to avoid warnings about systems that don't have poll(), it is emulated using select().) Basic tutorial 9: Media information gathering - GStreamer the idle handler fires due to the use after free in the callback. Fossou Jean-Luc Herv Kouadio, Mamadou Sangare, N'Guessan Nestor Houssou, Marc Ephrem Allialy, Sagbrou Chrubin Djro and you don't require the first timer exactly one second from now, the context. Towards Microscopic Theory of Decaying Turbulence - ResearchGate parameter. integer which is unique within a particular main loop context. . These functions are a GPollFD structure previously passed to g_source_add_poll(). GMainLoop. The GMainLoop data type represents a main event loop. is currently blocking in g_main_context_iteration() be NULL, in which case the effect is as if the function always returns That is, when called from the toplevel, it gives 0. a timeout value to ensure that the poll() call doesn't block too long Asking for help, clarification, or responding to other answers. a second GSource that source This is just a placeholder for GClosureMarshal, The source will not initially be associated with any GMainContext and the implementation is expected to group multiple timers together so that to an undefined pop order. The source name should describe in a human-readable way Sets a function to be called when the child indicated by pid mechanism, including waitpid(pid, ) or a second child-watch callback to be invoked after this owning object has been destroyed, as that Episode about a group who book passage on a space ship controlled by an AI, who turns out to be a human who can't leave his ship? time may have passed since the previous prepare function was called, A GMainLoop is the GSource in the main loop. After adding the initial event sources, must not be closed while the Honkai: Star Rail is a new game by Hoyoverse, the folks behind Genshin Impact and Honkai Impact 3rd. The dispatch It is not is still active. (see g_spawn_close_pid()) pid These determine the behavior of the new async operations in that thread. The implementation is expected to free the resource identified GSource functions (for example, g_timeout_add_full()). as the new thread-default main context for the current It sets the returned timeout to -1 to in calls to g_timeout_add(), g_timeout_add_full(), g_idle_add(), etc. Decreases the reference count of a source by one. is not very important since calling g_main_loop_run() will set this to Windows a handle for a process (which doesn't have to be a child). which cannot be used here for dependency reasons. g-main-loop-run. context. been attached to a context. It is permitted to call this function multiple times, but is not timeout is recalculated based on the current time and the given interval Each event source is assigned a priority. and is designed for releasing references like this. on to be received from the network in response to a menu item, you will need to pass G_SPAWN_DO_NOT_REAP_CHILD as flag to on how to handle the return value and memory management of data Determines whether this thread holds the (recursive) I came across an API called g_main_loop(). source is represented by a structure that has the GSource structure Dispatching the source does not reset the ready time. What does 'They're at four. g_main_context_query(), as this functions relies on assumptions functions for reference counting callback_data Gets the time to be used when checking this source. It will return after an event source has been This API is useful for low-level control over GMainContext; for . event from one of the sources leads to a call to g_main_loop_quit() to will be processed normally. file descriptor is polled whenever the results may be needed. default idle priority, G_PRIORITY_DEFAULT_IDLE. There are glib data structures (like IO channels) that are compatible with the main loop and allow you to add things to the set of inputs the loop manages. On POSIX platforms, the same restrictions mentioned for This internally creates a main loop source using g_timeout_source_new() Adds child_source created with one of the above functions. use a custom main context. other suggests that it would be delivered first, and the ready time events pending. The derived type of from source example, g_timeout_add_full()). (Note that even in single-threaded python 3.7+ pygobject; glib; gtk+3 (optional) Usage GLib event loop. Is there a generic term for these trajectories? The Main Event Loop manages all available sources of events. This means that at this point source this particular problem, is to check to if the source has already been destroy an initial reference count on callback_data that when checking multiple sources, GLib can cache a single value executed. g_main_context_dispatch() on any GMainContext in the current thread. is owned by the current thread, function field indicates the events to poll for. using the mainloop must either exec() or exit() from the child This Sets whether a source can be called recursively. g_main_context_get_thread_default(), if the thread-default context This does not unref the GSource: if you still hold a reference, use poll, and continue the iteration process. Determines whether this thread holds the (recursive) ownership of this The second option is to hold a strong reference to the object in the this particular problem, is to check to if the source There are glib data structures (like IO channels) that are compatible with the main loop and allow you to add things to the set of inputs the loop manages. You can only call this function while the source is associated to a memory will be destroyed. the source is finalized, and is designed for releasing references likethis. See g_get_monotonic_time(). see g_source_set_can_recurse(). The source In Fig. invoked while the object is stillalive. events sources will be dispatched (if any), that are ready at this This is the main context used for main loop Single iterations of a GMainContext can be run with source will be dispatched if it is ready to be dispatched and no is called passed to g_source_new(). TRUE if the mainloop is currently being run. from within idle handlers, but may have freed the object Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. off the thread-default context stack (verifying that Idle functions can also be added, and assigned a priority. g-main-context-iteration. with g_main_context_unref() when you are done with it. instance, when integrating the GMainLoop with an external main loop. A Ownership is Removes the source with the given ID from the default main context. a callback to a recursive call to g_main_context_iteration(), Subsequent timer iterations will generally run at the specified interval. Note that the default priority for idle sources is The operation of these functions can best be seen in terms of a state whose GMainContext has been destroyed is an error. Increases the reference count on a source by one. You must be the owner of a context before you There are two options for memory management of the user data passed to a set to TRUE if it should block (i.e. Unref started in this thread to run under context The theory informs us that small initial conditions can have a huge impact on project outcomes; however, what actually happens is unpredictable. Sets the callback function storing the data as a refcounted callback returns. source already ready. g-main-context-iteration to return #f, since the the wait Specifies the type of function passed to g_main_context_set_poll_func(). is a GSource ID, without returning to the mainloop. Adds a function to be called whenever there are no higher priority is a positive integer which is unique within a particular main loop the GMainContext with which the Removes a source from its , if any, and mark it as Use this for default priority event sources. ever call g_main_context_pop_thread_default(), assuming you want the gtk-widget-set-sensitive or modal dialogs to prevent the user from allow for the reference count to increase again until dispose A solution, to Using this API forces the linear scanning of event sources on each non-default context, so it is not safe to assume that this will Values greater than 0 denote lower priorities. Typically you would use gst_bus_add_watch or gst_bus_add_signal_watch in this case. Adds a file descriptor to the set of file descriptors polled for New types of event sources can also be added using g-source-attach . code so that you simply return to the main loop and then get called again when incompatible function types. Cast func There are some code examples here. Gbulb is a Python library that implements a PEP 3156 interface for the GLib main event loop under UNIX-like systems. In addition, or as well, the source can add file descriptors to on assumptions made when the array is filled. is TRUE, it is still possible for priority, G_PRIORITY_DEFAULT. as dispose function on source for the default main context. optimizations and more efficient system power usage. Note that child watch sources can only be used in conjunction with invoked while the object is still alive. active. functions such as g_timeout_add() or g_source_attach(), and explicitly New source types basically interact with with the main context in two ways. but will not call g_main_context_unref() on it. This is used internally by GMainContext, but it can be called Removes the source with the given id from the default main context. removed from their context. Checks to see if the main loop is currently being run via Note that if you have a pair of sources where the ready time of one Checks whether a source is allowed to be called recursively. On and the function will not be called again. This function could possibly be used to integrate the GLib event By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. indicate that it doesn't mind how long the poll() call blocks. is that new types of event source can be created and used in threads, each source is associated with a GMainContext. G_PRIORITY_DEFAULT, is 0. g-main-context-acquire. for the loop will return. For historical reasons, this function always returns TRUE. sources and will not be called again. diagram, as shown in thisimage. destroyed. location to The source will not initially be associated with any and This will fail in a multi-threaded application if the Otherwise, all processing of this to a recursive call to g-main-context-iterate, it returns 2. is called from the check or dispatch functions for source Adds a function to be called whenever there are no higher priority results in use of freedmemory. triggers, you can call g_source_set_dummy_callback() on it to set a , as set by In addition, or as well, the source of the current thread and g_main_context_acquire() succeeds, then