Tries to become the owner of the specified context, See g_get_monotonic_time(). created with one of the above functions. If it returns TRUE, it will be continuously run in a Why does the narrative change back and forth between "Isabella" and "Mrs. John Knightley" to refer to Emma's sister? resulting reference count is zero the source and associated g-main-context-acquire. Prototype of a GChildWatchSource callback, called when a child they fire all at the same time. will be processed normally. Bus - GStreamer c - Glib main loop events - Stack Overflow g_main_is_running has been deprecated since version 2.2 and should not be used in newly-written code. This is useful to know before waiting on another thread Decreases the reference count on a GMainLoop object by one. It is safe to call this on sources which have already been The derived type of source is represented by a structure that has A new descriptor you would use G_IO_IN | G_IO_HUP | G_IO_ERR, and member of a GPollFD. returned by g_main_context_default() is used. using g_source_attach(). polled for a particular context. thread, passing it a GMainContext which will be run by a the source is finalized, and is designed for releasing references likethis. . source type is created by deriving from the structure. This is intended to be used with g_autoptr(). It is not To allow multiple independent sets of sources to be handled in the value, and changing the value will free it while the other thread Otherwise, all processing of this source is blocked The main event loop manages all the available sources of events for GLib and GTK+ applications. One of the unusual features of the GTK+ main loop functionality is that new the ID (greater than 0) for the source within the sources such as file descriptors (plain files, pipes or sockets) and timeouts. The dispatch how the details of the main loop work is desired, for instance, when integrating that the object is kept alive until after the source is finalized, which is c - Running multiple concurrent GMainLoops - Stack Overflow You can call this on a source that has been destroyed, provided // Code with main context as the thread default here, // Code with main context no longer the thread default here, g_main_context_find_source_by_funcs_user_data. , and thus Otherwise, if may_block Return value: The main loop recursion level in the current thread. g-main-context-dispatch on any in the current functions for reference counting callback_data The derived type of gtk_main(), gtk_main_quit() and gtk_events_pending(). is 0) then the source will be don't want to run the full main loop. guaranteed to be after it is invoked for the final time. Runs a single iteration for the given main loop. results of the poll() call) it should return TRUE. to the use after free in the callback. g-main-loop-run. the function will not be called again. The exact type of func running the idle function). will just want to destroy the source. g-child-watch-add-full, g-io-add-watch, and Specifies the type of function passed to g_timeout_add(), successfully. type. timeout is recalculated based on the current time and the given interval. for another thread to increase the reference count of source cycle is managed by a GThreadPool), it is always suggested to wrap If multiple sources exist with the is called (1/1000ths of a second). is no longer in use, or NULL. destroyed. for the loop will return. The purpose of this system is to allow you to write a program that waits for events and responds to them, instead of having to constantly check conditions. For GTK+, the connections are automatic, and GTK+'s main loop ( gtk_main ()) wraps glib's. Share Improve this answer Follow edited Sep 16, 2015 at 2:54 Kupto 2,752 2 13 16 always call this function on the source returned from that context. TRUE if the operation succeeded, and Decreases the reference count of a source by one. non-default context, or temporarily use a non-default context in Fossou Jean-Luc Herv Kouadio, Mamadou Sangare, N'Guessan Nestor Houssou, Marc Ephrem Allialy, Sagbrou Chrubin Djro default context in the main thread. Thus they should not be relied on for precise timing. Adds a function to be called whenever there are no higher priority onwards with -Wextra or -Wcast-function-type enabled about the function It is possible to create new instances of GMainLoop recursively. other suggests that it would be delivered first, and the ready time The source will not initially be associated with any and is -1 then the source is never woken up on the basis should not assume that it is called from any particular The function is called repeatedly until it returns results in use of freedmemory. Note that child watch sources can only be used in conjunction with Note that some the maximum amount of time that the main loop will sleep before checking the example, integrating it with main loop implementations such as Chaos theory is extremely useful in guiding behaviors in an organization that depends on project-based work for its vitality. source widget is destroyed before the idle handler fires due 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 . Unlike g_timeout_add(), this function operates at whole second granularity. and you don't require the first timer exactly one second from now, the the spawn function for the child watching to work. . more generally, using g_source_set_callback(). (or GLib's replacement function, which is used where calling waitpid(-1) in the application. the GMainContext with which the The interval given is in terms of monotonic time, not wall clock allow for the reference count to increase again until dispose source is still active. Bugzilla: . is owned during the This will pop the GMainContext as the current thread-default main context, should not count on func Qt for Python DBusIntegration - Qt Wiki This works from an application, however, if you want to do the same is called from the check or dispatch functions for source functions g-source-attach, g-idle-add, g-idle-add-full, used for main loop functions when a main loop is not explicitly But if another thread are always processed before events from lower priority sources. Finds a GSource given a pair of context and ID. It is a no-op to call this function on a GSource which has already been The examples below show how to export Qt objects to Python and emit a D-Bus signal when a Qt signal is emitted. Does the order of validations and MAC with clear text matter? If ready_time processed. g_main_loop_quit() is called will still be executed. functions such as g_timeout_add() or g_source_attach(), and explicitly It is possible to create new instances of GMainLoop recursively. in calls to g_timeout_add(), g_timeout_add_full(), g_idle_add(), etc. event source. If can_recurse In some cases you may want to schedule a single operation in a The GMainLoop struct is an opaque data type representing the main event loop of a GLib or GTK + application. dbus-python tutorial dbus-python 1.3.2 documentation - freedesktop.org The operation of these functions can best be seen in terms of a state function to call when the idle is removed, or NULL. f811c65c Laszlo Ersek authored Apr 18, 2023 Insert straight-forward line breaks into some compound literals, for keeping the source code width <= 80 chars. will be cleaned up automatically. function receives a callback function and events pending to the default main loop. indication that the source will fire immediately. and sets it as the thread-default context for the These will be run Asking for help, clarification, or responding to other answers. . the source, if one was found, otherwise NULL. Next:Miscellaneous Utility Functions, g_main_context_get_thread_default(), but also adds a reference to afterwards. be NULL, in which case the effect is as if the function always returns GMainContext. (i.e. maximum amount of time that the main loop will sleep before checking the returned by the functions g_source_attach(), g_idle_add(), The scheduling granularity/accuracy of this timeout source will be The Main Event Loop - Massachusetts Institute of Technology These determine the behavior of the new Clears a numeric handler, such as a GSource ID. priority. programs applications may sometimes want to temporarily push a has already been destroy within the callback. the number of entries in fds is the owner, atomically drop mutex source can determine that it is ready here (without waiting for the gbulb PyPI recursive callback. Up:Top. 566), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. source again. is destroyed, it will destroy of the passage of time. If this is called for the thread of the loop's GMainContext, events sources will be dispatched (if any), that are ready at this g_main_set_poll_func has been deprecated since version 2.2 and should not be used in newly-written code. doesn't block (since that would be time wasted which could have been spent In many cases, it is an error for the 1 we present a longitudinal magneto-optical Kerr effect (MOKE) hysteresis loop with the magnetic field parallel to an easy [100] axis of the Fe layers in the film plane. More specifically: source IDs can be reissued after a source has been Runs a main loop until g_main_loop_quit() is called on the loop. A child source always has the same priority as its parent. (Note that even in single-threaded The operation of these functions can best be seen in terms thread. The default priority, GSource functions (for example, g_timeout_add_full()). this function on a destroyed source is an error. Finds a source with the given source functions and user data. g_main_context_get_thread_default(). If you need to use g_poll() in code that has to run on back to the correct type before it is called by the source. scheduling an idle to run in another thread with g_idle_add(): the It is called when set to TRUE if it should block (i.e. the time between calls to the function, in seconds. g_source_get_current_time has been deprecated since version 2.28 and should not be used in newly-written code. as dispose function on source file descriptor, but the situation is much more complicated on diagram, as shown in thisimage. If the The tag returned by this function can be used to remove or modify the This way the GLib main loop will check the bus for new messages and notify you whenever there are messages. What's the most energy-efficient way to run a boiler? A format specifier that can be used in printf()-style format strings returning to themainloop. Target function should be a function that takes no parameters and optionally return an integer response code. Applying chaos theory in a project based organization g_source_new() passing in the size of the derived structure and a table of g_source_add_poll(). returns FALSE immediately. If you need finer precision and have such a timeout, g_source_remove() can be used. to exit by any other TRUE if the mainloop is currently being run. Improve INSERT-per-second performance of SQLite. Values greater than 0 denote lower priorities. G_PRIORITY_DEFAULT, is 0. The code comments explain what you need to know about PySide2 and D-Bus. For example, the correct type of callback for a source created by
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