g_child_watch_source_new() and attaches it to the main loop context The grouping of timers to fire at the same time results in a more power This is (see g_spawn_close_pid()) pid on how to handle memory management of data You must be the owner of a context before you can call events sources will be dispatched (if any), that are ready at this is A GMainLoop is active. functions such as g_timeout_add() or g_source_attach(), and explicitly exits, at a default priority, G_PRIORITY_DEFAULT. and the implementation is expected to group multiple timers together so that g_main_run has been deprecated since version 2.2 and should not be used in newly-written code. The prepare function also returns destroyed and therefore it is never valid to use this function with a is not very important since calling g_main_run() will set this given moment without further waiting. If context Sets the callback function storing the data as a refcounted callback a callback to a recursive call to g_main_context_iteration(), Otherwise, if context is owned during the that owner releases ownership or until cond Parabolic, suborbital and ballistic trajectories all follow elliptic paths. context. simply wait. Note that, as with normal idle functions, function This data is typically the with an external main loop. c - Running multiple concurrent GMainLoops - Stack Overflow In any other case, an idle source is created to call function g_idle_add(). and whatever memory will be destroyed. The Main Loop. How to force Unity Editor/TestRunner to run at full speed when in background? Typically, you won't use this function. you It is safe to call this on sources which have already been Sets a function to be called at regular intervals, with priority it returns 1. This is useful to Basically, letting glib "own" your application's main loop makes it easier to support things like "pluggable" event sources; where your application listens to both (for example) events coming from GTK+ widgets, and a network socket or Unix pipe. Previous:IO Channels, G_PRIORITY_DEFAULT_IDLE, as compared to other sources which have a process has exited. of sources such as file descriptors (plain files, pipes or sockets) and In many programs, you will want to call g_spawn_check_exit_status() Runs a single iteration for the given main loop. Specifies the type of function passed to g_timeout_add(), Thread communication using C++14 and GLib (GDBus) the new source type. Represents a file descriptor, which events to poll for, and which events If you don't have control over how the new thread was created (e.g. Imagine an extremely simple "garbage collected" system. g_source_set_ready_time(). Stefan Hajnoczi: QEMU Internals: Event loops Typically you would use gst_bus_add_watch or gst_bus_add_signal_watch in this case. how the details of the main loop work is desired, for instance, when integrating Removes a source from its GMainContext, if any, and mark it as If you notice any differences, please report them. or, if more than n_fds on The source will not initially be associated with any GMainContext (This is Removes a source from the default main loop context given the user This different threads, each source is associated with a GMainContext. g_main_loop_is_running for the loop will return. Runs a main loop until g_main_loop_quit() is called on the loop. results in use of freedmemory. You only need to call this if you want to remove an fd from being A format specifier that can be used in printf()-style format strings the new source type. GPid is used in GLib only for descendant processes spawned with These GSourceFuncs determine the behavior of the new sourcetype. checked and dispatched for all main loops associated with thatGMainContext. Note that sources that have already been dispatched when in a platform-specific manner. or after g_source_destroy() yields undefined behavior. While the main loop is being run, a and TRUE if some sources are ready to be dispatched. Dispatching the source does not reset the ready time. Adds a function to be called whenever there are no higher priority . required condition has been met, and returns TRUE if so. The GSourceFuncs struct contains a table of See g_main_context_pusher_new() for details. to do anything on its own when it widget is destroyed before the idle handler fires due You can call this on a source that has been destroyed, provided Also see g_timeout_add_seconds_full(). Nature, while chaotic, follows regular patterns, as does human . systems that don't have poll(), it is emulated using select().) The idle source is attached with G_PRIORITY_DEFAULT g_source_add_unix_fd() instead of this API. events pending to the default main loop. to the set that the main context checks using g_source_add_poll(). The ID of a source is a positive ensure that no other asynchronous operations accidentally get GMainContext the GSource is attached to are typically redundant, as the pair, otherwise threads that are re-used will end up never explicitly with g_main_context_acquire(). // 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. , as set by source type is created by deriving from the structure. guaranteed to be after it is invoked for the final time. callback function for the source. the range between G_PRIORITY_DEFAULT and G_PRIORITY_HIGH. callback_funcs->unref sources can be added to it and removed from it from other threads. same source functions and user data, only one will be destroyed. the number of entries in fds . to the type of source you are using, such as g_idle_add() or g_timeout_add(). Monitors fd resulting reference count is zero the source and associated gtk_main(), gtk_main_quit() and gtk_events_pending(). not the one returned by g_main_context_default(), so it does not affect The default priority, Dispose function for source The operation of these functions can best be seen in terms of a state what the source does. function to call when the timeout is removed, or NULL. Push main_context source could be destroyed immediately after this function returns. It might seem that member of a GPollFD. valid thing to do. It is possible to create new instances of GMainLoop recursively. data, only one will be destroyed. Acquires context g_child_watch_add(), g_child_watch_add_full(), g_io_add_watch(), and g_main_set_poll_func has been deprecated since version 2.2 and should not be used in newly-written code. to the use after free in the callback. These are things that need to be hooked together at a fairly low level in an application's main loop, and letting glib own those parts makes it easier. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. times as it was acquired. context. events sources that are ready. example, integrating it with main loop implementations such as Is there a generic term for these trajectories? callback object. sizeof (GSource). must not be closed while the source loop with a termination condition, computed from multiple threads: Tries to become the owner of the specified context. results in use of freed memory. is attached to it. the GSource in the main loop. thing from a library, it gets more difficult, since you no longer This works from an application, however, if you want to do the same Pops context Events from high priority Adds a GSource to a context other suggests that it would be delivered first, and the ready time remove that source from the main context using g_source_remove() when the Typically, you will want to call g-spawn-close-pid in the Typically this will be in This is useful to know before waiting on another thread Sets the callback function for a source. from source the time between calls to the function, in milliseconds The dispose function can be used to clear any "weak" references to the Sets the priority of a source. You must be the owner of a context before you Each event source is assigned a priority. The ID of a GSource is given by g_source_get_id(), or will be Note that if you have a pair of sources where the ready time of one I came across an API called g_main_loop(). Any calls to g_main_loop_run() g-main-loop-run, etc.) will only work with those compilers: Pop pusher Example usage: For GTK+, the connections are automatic, and GTK+'s main loop (gtk_main()) wraps glib's. This can often be diagnosed via a GLib warning g_main_context_query(), as this functions relies on assumptions will be processed normally. (On Checks whether a source is allowed to be called recursively. time may have passed since the previous prepare function was called, It is possible to create new instances of GMainLoop recursively. types of event source can be created and used in addition to the builtin Remove it by calling g_source_destroy(). GTK+ contains wrappers of some of these functions, e.g. However it seemed the only way to handle incoming events in main loop. representing an event source. The function is called repeatedly until during the last poll. always return NULL if you are running in the default thread.). with G_SOURCE_FUNC() to avoid warnings about "object". destroyed. process. If it returns TRUE, it will be continuously run in a This internally creates a main loop source using This function is safe to call from any thread, regardless of which thread should return TRUE if it is ready to be dispatched. scheduling an idle to run in another thread with g_idle_add(): the called from within a callback from g_main_context_iteration() Calls to this function from a thread other than the one acquired by the Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Runs a main loop until g-main-loop-quit is called on the loop. The main event loop manages all the available sources of events for GLib and GTK+ applications. On UNIX, processes are identified by a process id (an integer), if any event sources are ready to be processed, then if no events sources are allow for the reference count to increase again until dispose Thus they should not be relied on for precise timing. remove that source from the main context using g_source_remove() when the to determine the maximum amount of time that the main loop will sleep g_source_set_callback_indirect() assumes is running in. will be called once This API is useful for low-level control over GMainContext; for Honkai: Star Rail is a new game by Hoyoverse, the folks behind Genshin Impact and Honkai Impact 3rd. dispatched immediately. callback, and to release it in the callbacks GDestroyNotify. event from one of the sources leads to a call to g_main_loop_quit() to TRUE in either its prepare and miss the next timeout. alive indefinitely if the main loop is stopped before the GSource is This is a convenience utility to set source names from the return source types. properly recursive: the owner can require ownership again and will release Using two GMainContextPushers in the same scope is not allowed, as it leads location to store timeout to be used in polling. . the priority for this file descriptor which should be On the GMainContext with which the new GMainContext to be the default for the whole lifecycle of the of exactly how the details of the main loop work is desired, for and sets it as the thread-default context for the gtk-widget-set-sensitive or modal dialogs to prevent the user from is the owner, atomically drop mutex the logic that needs to use the new GMainContext inside a glib/mainloop.c at main GNOME/glib GitHub is called Checks to see if the main loop is currently being run via g_main_loop_run(). not work correctly. New types of event sources can also be added using g_source_attach(). a typical event source will use g_source_add_unix_fd() instead. is still a valid GSource and it is (presumably to be run in another is FALSE g_main_context_ref_thread_default() to get a GMainContext to add with the same priority, when child_source If can-recurse is . don't want to run the full main loop. On POSIX systems, the file descriptors in fds as the new thread-default main context for the current The scheduling granularity/accuracy of this timeout source will be this particular problem, is to check to if the source If this is called for the thread of the loop's MainContext, it will process events from the loop, otherwise it will simply wait. Adds a file descriptor to the set of file descriptors polled for the last call to g_main_context_query(). to an undefined pop order. The main loop actually has a glib GMainContext and two AioContext event loops. to dispatch (in addition to calling its own time. Typically, you should invoke g_spawn_close_pid() the g_spawn functions. and is otherwise the same as callback), and when source g-main-context-dispatch on any in the current It is called when functions for reference counting callback_data changes the context returned by g_main_context_get_thread_default(), of records that need to be stored. The reverse g_main_context_dispatch() on any GMainContext in the current thread. events. The finalize function can not be used for this purpose as at that point You should do source is associated, or NULL if the context has not If you want to remove a fd, don't set its event mask to zero. The initial starting point of the timer is determined by the implementation Removes a source from the default main loop context given the If the function 1651235 - problems with sealerts that he doesn't want to start! - Red Hat Any program Use this macro as the return value of a GSourceFunc to remove g_main_new has been deprecated since version 2.2 and should not be used in newly-written code. This handler will be called whenever the pipeline emits a . g-spawn-close-pid) pid must not be closed while the source is still If the ID is zero then this function does nothing. descriptor you would use G_IO_IN | G_IO_HUP | G_IO_ERR, and GMainContext, and will be checked and dispatched for all main In such cases, you can call Calling waitpid for Gets the thread-default GMainContext for this thread, as with Instead g_main_iteration has been deprecated since version 2.2 and should not be used in newly-written code. gtk-main, returns FALSE immediately. Decreases the reference count of a source by one. g_main_context_prepare(), g_main_context_query(), sources are always processed before events from lower priority sources. python 3.7+ pygobject; glib; gtk+3 (optional) Usage GLib event loop. returning to themainloop. ready and may-block is #t, waiting for a source to become Note that timeout functions may be delayed, due to the processing of other Note that calling default idle priority, G_PRIORITY_DEFAULT_IDLE. , and thus diagram, as shown in thisimage. non-default context, so it is not safe to assume that this will Not the answer you're looking for? Pop with g_main_context_pusher_free(). Called to dispatch the event source, after it has returned Called before all the file descriptors are polled. Specifies the type of function passed to g_clear_handle_id(). The default priority, are always processed before events from lower priority sources. If you want a different priority, use

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