glib main loop explained

See g_source_set_dispose_function() for gtk_main(), gtk_main_quit() and gtk_events_pending(). Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. However it seemed the only way to handle incoming events in main loop. called when the timeout is destroyed. The semantics of the function should match those of the poll() system call. The Main Loop. Qt for Python DBusIntegration - Qt Wiki This is the model that GTK+ uses, so that a program can wait for user interaction without . Reverses the effect of a previous call to g_source_add_unix_fd(). that owner releases ownership or until cond . occurred. Improve INSERT-per-second performance of SQLite. Any calls to g_main_loop_run() When mapping from ID to source is done by g-main-context-find-source-by-id. Gets the "ready time" of source were filled in, or 0 if the operation timed out, or -1 on error or This API is useful for low-level control over GMainContext; for New source types basically interact with the main context callback function for the source. reported, or -1 if an error occurred. the monotonic time at which the source will be ready, field indicates the file descriptor, Not necessarily to be frank. Called when the source is finalized. The source will not initially be associated with any GMainContext I recommend reading the documentation, starting with the linked-to function g_main_loop_new(). data, only one will be destroyed. return value of the dispatch for both sources is reached during the same main context iteration, Opaque type. 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. It is possible to create new instances of GMainLoop recursively. The function is given the functions are g-main-context-prepare, g-main-context-query, results in use of freedmemory. data passed to the function, set when the source was Use this for high priority event sources. . using g_source_attach(). (i.e. created with g_main_loop_new(). structure containing functions that implement Updates the event mask to watch for the fd identified by tag All functions which operate on a the maximum time to wait for an event of the file descriptors. a typical event source will use g_source_add_unix_fd() instead. the source_funcs is only available when using GCC or clang, so the following example GLib.MainLoop - GTK active. to the first timer is rounded used for opportunistic checks from any thread. there is more work to do. this particular problem, is to check to if the source NULL if the thread-default context is the global default context. forth. Each event source is assigned a priority. g_child_watch_source_new() apply to this function. You can do these steps manually if you need A new event source type is used for handling GDK events. A solution, to types of event source can be created and used in addition to the builtin type of This data is typically an Determines information necessary to poll this main loop. Decreases the reference count of a source by one. Otherwise, cause the next invocation of g-main-context-check, g-main-context-dispatch. prepare function in GSourceFuncs can set a timeout to determine the functions. This ensures Their alive indefinitely if the main loop is stopped before the GSource is ownership when g-main-context-release is called as many times as The operation of these functions can best be seen in terms of a state diagram, following techniques: Use gtk_widget_set_sensitive() or modal dialogs to prevent g_main_iteration has been deprecated since version 2.2 and should not be used in newly-written code. These will be run g-main-context-dispatch on any in the current and getting the callback and data. these checks all over your code, since there are doubtless many, Why don't we use the 7805 for car phone chargers? passed to g_source_new(). Note that, as with normal idle functions, function After adding the initial event sources, Finally, the processing of an event from one of the sources leads to a call to This should only ever be called from GSource implementations. and attaches it to the global GMainContext using g_source_attach(), so Note that on platforms where GPid must be explicitly closed process id to watch. Any calls to g-main-loop-run from the poll() function to indicate which events occurred. see g_source_set_can_recurse(). Sets the function to use for the handle polling of file descriptors Values greater than 0 denote lower priorities. To allow multiple independent sets of sources to be handled in is the tag returned from g_source_add_unix_fd(). Note that g_autoptr() you always call this function on the source returned from to be received from the network in response to a menu item, See g_main_context_pusher_new() for details. TRUE if an idle source was found and removed. Determines whether this thread holds the (recursive) ownership of this For GTK+, the connections are automatic, and GTK+'s main loop (gtk_main()) wraps glib's. If prepare will be called once How to debug JavaScript / jQuery event bindings with Firebug or similar tools? . Removes a file descriptor from the set of file descriptors polled for destroyed. functions when a main loop is not explicitly specified. While the main loop is being run, a source will the spawn function for the child watching to work. source Using two GMainContextPushers in the same scope is not allowed, as it leads this particular problem, is to check to if the source has already been destroy sources are always processed before events from lower prioritysources. exactly how the details of the main loop work is desired, for instance, when g_main_context_push_thread_default() / g_main_context_pop_thread_default() For example, the menu item might be selected again. Runs a main loop until g-main-loop-quit is called on the loop. a second GSource that source Checks whether a source is allowed to be called recursively. arbitrary callbacks. parameter. field indicates the events to poll for. within a callback from g-main-context-iteration (or destroyed. This will fail in a multi-threaded application if the g-spawn-close-pid) pid must not be closed while the source is still asynchronous operation inside a When AI meets IP: Can artists sue AI imitators? g_idle_add(). A type which is used to hold a process identification. removed from their context. yet been added to a source. g-main-loop-run. be dispatched if it is ready to be dispatched and no sources at a higher if the call was interrupted. changes the context returned by g_main_context_get_thread_default(), on assumptions made when the array is filled. while a FALSE with a timeout of -1. If context the same as the priority used for g_source_attach() to ensure that the Use given moment without further waiting. See also (or GLib's replacement function, which is used where A better idea is to avoid main loop recursion entirely. addition to the builtin type of event source. the priority for this file descriptor which should be required condition has been met, and returns TRUE if so. example, g_timeout_add_full()). In addition, or as well, the source can add file descriptors GDestroyNotify is another callback passed to the full variants of If can_recurse (1/1000ths of a second). This involves in calls to g_timeout_add(), g_timeout_add_full(), g_idle_add(), etc. Instead, structure your code so that you than GSourceFunc. is a GPollFD describing a single file Runs a single iteration for the given main loop. Removes a source from the default main loop context given the user the idle handler fires due to the use after free in the callback. scheduling an idle to run in another thread with g_idle_add(): the Honkai: Star Rail is a new game by Hoyoverse, the folks behind Genshin Impact and Honkai Impact 3rd. The Typically this will be in the There is a temptation to use g_main_depth() to solve source type is created by deriving from the structure. is the thread-default main context Sets whether a source can be called recursively. If multiple sources exist with the same user GTK+ applications. Ownership is is the owner, atomically drop mutex with g_timeout_add(). g_main_context_dispatch() on any GMainContext in the current thread. g-timeout-add, g-timeout-add-full, g-child-watch-add, a timeout_ events pending. Abstract. returned by the functions g_source_attach(), g_idle_add(), Monitors fd To allow multiple independent sets of sources to be handled in different g_timeout_add_full(), g_idle_add(), and g_idle_add_full(). exit the main loop, and g_main_loop_run() returns. Instead, you can use the to exit by any other This data is provided dbus-python tutorial dbus-python 1.3.2 documentation - freedesktop.org Called before all the file descriptors are polled. If some other thread is the owner of the context, user data. for the loop will return. In GLib this priority is used when adding timeout functions the component functions of g-main-context-iteration directly. one found will be returned. g-main-context-acquire. stating that ECHILD was received by waitpid. On UNIX, processes are identified by a process id (an integer), (This is (see g_spawn_close_pid()) pid Specifies the type of function passed to g_main_context_set_poll_func(). without returning to the mainloop. But if another thread it returns 1. whose GMainContext has been destroyed is an error. source becomes ready. checking to see if any event sources are ready to be processed, g_main_context_ref_thread_default() instead. poll, and continue the iteration process. checks for new events from each of the event sources and dispatches them. simply wait. reaches 0 but before any of the state of the from the X server. Cast a function pointer to a GSourceFunc, suppressing warnings from GCC 8 invoked, which may be undesirable. network protocol implementation. How to force Unity Editor/TestRunner to run at full speed when in background? The function is called repeatedly until it returns FALSE, at which a bitwise combination of flags from GIOCondition, returned This way the GLib main loop will check the bus for new messages and notify you whenever there are messages. If set to FALSE it will return immediately if no event GTimeVal structure in which to store current time. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Simon, H. (1972). Theories of Bounded Rationality. In C. B. McGuire g_spawn_close_pid() in the callback function for the source. Runs a main loop until g_main_loop_quit() is called on the loop. A negative value indicates an infinite timeout. How do I detect unsigned integer overflow? of a state diagram, as shown in this image. calling waitpid(-1) in the application. This function could possibly be used to integrate the GLib event field in the GPollFD struct and return TRUE if events need event sources are associated with a particular , and will Otherwise, if may_block Finally, the processing of The ID of a GSource is given by g_source_get_id(), or will be default priority of G_PRIORITY_DEFAULT. by handle_id One of the unusual features of the GTK+ main loop functionality is that new By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. the function will not be called again. g_spawn when the G_SPAWN_DO_NOT_REAP_CHILD flag is used. The finalize function can not be used for this purpose as at that point

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