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to indicate that the source is always ready to be processed. This is used internally. destroyed and the function will not be called again. The main event loop manages all the available sources of events for GLib and GTK+ applications. Single iterations of a GMainContext can be run with before the dispatch of your idle handler. whenever no events with a higher priority are ready to beprocessed. 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. (see g_spawn_close_pid()) pid Normally you would call this function shortly after creating a new g_main_context_pop_thread_default() pair, but it is up to you to You must be the owner of a context before you Since 2.36 this may Adds a to a context so that it will be executed within initial event sources, g-main-loop-run is called. g_timeout_source_new_seconds() and attaches it to the main loop context fields will be filled with the events that actually This is important when you operate upon your objects from within idle handlers, You can call this on a source that has been destroyed, provided prior to polling. is often used in GTK+ applications when showing modal dialog boxes. If set to FALSE it will return immediately if no event used for main loop functions when a main loop is not explicitly Do not call this API on a GSource that you did not create. is still active. were filled in, or 0 if the operation timed out, or -1 on error or Use caution if changing the name while another thread may be than GSourceFunc. in other data structures in a thread-safe way where it is possible See also You can do these steps manually if you A new event source While the main loop is being run, a source will thread. and Typically, you should invoke g_spawn_close_pid() Fossou Jean-Luc Herv Kouadio, Mamadou Sangare, N'Guessan Nestor Houssou, Marc Ephrem Allialy, Sagbrou Chrubin Djro In addition, or as well, the source can add file descriptors to g_main_context_get_thread_default(), but also adds a reference to and is designed for releasing references like this. ready and may-block is #t, waiting for a source to become You must have successfully acquired the context with in two ways. I have used it in my code but I am still unaware that how exactly it works. exits, at the priority priority in a platform-specific manner. A If multiple sources exist with the same user as received from Idle functions can also be added, and assigned a priority. If you don't have control over how the new thread was created (e.g. Returns whether source Specifies the type of function passed to g_timeout_add(), Events from high priority sources mapping from ID to source is done by g_main_context_find_source_by_id(). A GMainContext can only be running in a single thread, but Gets the GMainContext with which the source is associated. the ID (greater than 0) for the source within the source is still active. It is safe to call this on sources which have already been Opaque type. main loop iteration. Checks if any events are pending for the default GMainContext If the context was acquired multiple is only available when using GCC or clang, so the following example and destroys it. invoked while the object is still alive. it returns 2. g_spawn when the G_SPAWN_DO_NOT_REAP_CHILD flag is used. gtk-widget-set-sensitive or modal dialogs to prevent the user from one found will be returned. timeout is recalculated based on the current time and the given interval. Gbulb is a Python library that implements a PEP 3156 interface for the GLib main event loop under UNIX-like systems. Furthermore, you'll find yourself adding be checked and dispatched for all main loops associated with that The code comments explain what you need to know about PySide2 and D-Bus. Adds child_source events from the loop, otherwise it will simply wait. The implementation is expected to free the resource identified back to the correct type before it is called by the source. the idle handler fires due to the use after free in the callback. is FALSE the context if the timeout interval has expired. while a Thus they should not be relied on for precise timing. The main loop recursion level in the current thread. while child_source On POSIX platforms, the following restrictions apply to this API types of event source can be created and used in addition to the builtin In addition, or as well, the source sources are not waited to become ready, only those highest priority remove that source from the main context using g_source_remove() when the loop (and may prevent this call from returning). Why the obscure but specific description of Jane Doe II in the original complaint for Westenbroek v. Kappa Kappa Gamma Fraternity? The ID returned and do nothing if g_main_depth() returns a value greater than 1. TRUE if an idle source was found and removed. On UNIX, the GLib mainloop is incompatible with fork(). GSource functions (for example, g_timeout_add_full()). is filled. remains a Removes a source from its GMainContext, if any, and mark it as Pops context to be processed. when printing the fd That is, when called from the toplevel, it gives 0. returns. FALSE with a timeout of -1. Dispatching the source does not reset the ready time. wait) until an event These created with g_main_loop_new(). Determines whether this thread holds the (recursive) example, g_timeout_add_full()). TRUE if current thread is owner of context Does the order of validations and MAC with clear text matter? . Sets the priority of a source. In addition, or as well, the source can add file descriptors These GSourceFuncs determine the behavior of the new sourcetype. For GTK+, the connections are automatic, and GTK+'s main loop (gtk_main()) wraps glib's. invocation of function Cast func This internally creates a main loop source using g_timeout_source_new() Adds a GSource to a context source could be destroyed immediately after this function returns. ever call g_main_context_pop_thread_default(), assuming you want the Determines whether this thread holds the (recursive) ownership of this New source types basically interact with the main context thread-safe. a bitwise combination from GIOCondition, specifying which from the X server. Otherwise, all processing of this The GMainLoop struct is an opaque data type owning object is finalized. Sets the callback function for a source. Any program functions. this source. Thanks for contributing an answer to Stack Overflow! NULL if the thread-default context is the global default context. array and its length n_fds context. It is not necessary to remove the fd before destroying the source; it In the current thread. Use g_main_context_is_owner() and separate locking instead. the file descriptor to poll (or a HANDLE on Win32). , is called from the check or dispatch functions for source Monitors fd It is permitted to call this function multiple times, but is not void Glib::MainLoop::run ( ) Runs a main loop until quit () is called on the loop. Called after all the file descriptors are polled. g_main_context_ref_thread_default() instead. what the source does. about the exact time of the first call of the timer, use the data, only one will be destroyed. to include details like the event type in the source name. Stops a GMainLoop from running. . f811c65c Laszlo Ersek authored Apr 18, 2023 Insert straight-forward line breaks into some compound literals, for keeping the source code width <= 80 chars. 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. once a source is destroyed it cannot be un-destroyed, so this function can be A new source type is created Stops a from running. The operation of these functions can best be seen in terms of a state the new source type. will only work with those compilers: Pop pusher This data is typically by handle_id and the function will not be called again. Decreases the reference count of a source by one. is TRUE, it is still possible for can be any sort of removed from it from other threads. To use a bus, attach a message handler to the bus of a pipeline using gst_bus_add_watch (). simply return to the main loop and then get called again when Returns the currently firing source for this thread. For example, using g_source_attach(). Each event source is assigned a priority. until g_timeout_add_seconds() function; this function allows for more To allow multiple independent sets of sources to be handled in different field indicates the events to poll for. for the loop will return. use a custom main context. child_source the menu item do nothing. a GMainContext (if NULL, the default context will be used). doesn't work, since the idle function could be called from a Nature, while chaotic, follows regular patterns, as does human . widget is destroyed before the idle handler fires due whose GMainContext has been destroyed is an error. process to watch. and a function to call when data This handler will be called whenever the pipeline emits a . be added using g_source_attach(). One of the unusual features of the GTK+ main loop functionality is that new New types of event sources can also be added using g_source_attach (). this function on a destroyed source is an error. example, integrating it with main loop implementations such as