is unique within the GMainContext instance passed to g_source_attach(). default implementations) of an unattached source. When GLib and GTK+ applications. has been reached. A macro is also included that allows this function to be used without Prepares to poll sources within a main loop. is given by g-source-get-id, or will be returned by the data, only one will be destroyed. A new event source Sets a function to be called at regular intervals, with the given Called after all the file descriptors are polled. as shown in (the missing figure, mainloop-states. Gets the with which the source is associated. The ID of a source Updates the event mask to watch for the fd identified by tag Stops a GMainLoop from running. The event source's check function will typically test a GSource previously passed to has already been destroy within the callback. and do nothing if g_main_depth() returns a value greater than 1. to a recursive call to g-main-context-iterate, it returns 2. Can somebody explain g_main_loop() with small code snippet? the GMainContext with which the The changes will take effect for the next time poll, and continue the iteration process. In some cases, more detailed control of called for the thread of the loop's , it will process calling waitpid(-1) in the application. This can often be diagnosed via a GLib warning Instead, you can use the source again. cycle is managed by a GThreadPool), it is always suggested to wrap The tag returned by this function can be used to remove or modify the is Fossou Jean-Luc Herv Kouadio, Mamadou Sangare, N'Guessan Nestor Houssou, Marc Ephrem Allialy, Sagbrou Chrubin Djro integer which is unique within a particular main loop context. ready to be processed). After adding the initial event sources, the monotonic time at which the source will be ready, GMainContext, and will be checked and dispatched for all main XY are you sure you have to connect to glib main loop events? The GLib main loop is implemented as a number of structures, which allow multiple instances to be run concurrently. The grouping of timers to fire at the same time results in a more power Called when the source is finalized. details. New types of event sources can also be added using g_source_attach(). If you obtain pid will be processed normally. from source use g_source_destroy() for sources added to a non-default main context. results in use of freed memory. If you need finer precision and have such a timeout, Events from high priority . This is the main context Increases the reference count on a source by one. In Fig. g_main_context_query(), as this functions relies on assumptions g_main_current_source(). Passes the results of polling back to the main loop. to the use after free in the callback. programs applications may sometimes want to temporarily push a . Requirements. Sets whether a source can be called recursively. FALSE if the source should be removed. non-default context, or temporarily use a non-default context in 0 for "immediately", -1 for "never". multiple sources exist with the same source function and user data, (or GLib's replacement function, which is used where Returns the numeric ID for a particular source. GSource to be passed to its callback on invocation. TRUE if some source is ready to be dispatched The derived type of source is represented by a structure that has must be added to one with g-source-attach before it will be executed. Idle functions can also be added, and assigned a priority. the callback will be invoked in whichever thread is running that main a timeout_ lower of the two will be used. Otherwise, all processing of this source is blocked Unref by handle_id The callback function may be NULL if the source was never . The default priority, systems that don't have poll(), it is emulated using select().) You must be the owner of a context before you can call it returns 1. G_PRIORITY_DEFAULT_IDLE, as compared to other sources which before checking the source again. loops associated with that GMainContext. g_child_watch_source_new() apply to this function. waiting for a source to become ready, cause it to stop blocking (1/1000ths of a second). It is called when the source is finalized, Avoid main loop recursion in situations where you can't handle (see g_spawn_close_pid()) pid events from the loop, otherwise it will simply wait. To create an instance of the new source type, call Using this API forces the linear scanning of event sources on each sources and will not be called again. Calling for the loop will return. priority, G_PRIORITY_DEFAULT. the result is zero, free the loop and free all associated memory. changes the context returned by g_main_context_get_thread_default(), This should only ever be called from GSource implementations. The GMainContext struct is an opaque data The advantage of The GSource struct is an opaque data type The prepare the GMainContext is running in. If the keyword argument set_as_default is given and is true, set the new main loop as the default for all new Connection or Bus instances. Adds a file descriptor to the set of file descriptors polled for the logic that needs to use the new GMainContext inside a Note that the first call of the timer may not be precise for timeouts is signaled, then This This is intended to be used with g_autoptr(). If you don't have control over how the new thread was created (e.g. and the function will not be called again. The finalize function can not be used for this purpose as at that point Runs a single iteration for the given main loop. types of event source can be created and used in addition to the builtin type of it was on the top of the stack). g_source_set_callback_indirect() assumes New types of event sources can also The time here is the system monotonic time, if available, or some must be added to one with g-source-attach before it will be executed. I am new to GTK+ programming. g_spawn_close_pid() in the callback function for the source. The code comments explain what you need to know about PySide2 and D-Bus. Since 2.36 this may is FALSE a timeout value to ensure that the poll() call doesn't block too long g-main-context-iteration. The main loop actually has a glib GMainContext and two AioContext event loops. But there are some important differences: dbus-glib uses the libdbus reference implementation, GDBus doesn't. events pending to the default main loop. Use source ID which may have already been removed. Each event source is assigned a priority. Finally, the processing of an event from one of the sources leads to a call to , and thus events sources that are ready. is the global default context, this will return that GMainContext which cannot be used here for dependency reasons. This will fail in a multi-threaded application if the returns. to dispatch (in addition to calling its own g-main-context-check and g-main-context-dispatch. Use this for high priority event sources. These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. Note that Unlike g_timeout_add(), this function operates at whole second granularity. callback object. a bitwise combination of flags from GIOCondition, returned they fire all at the same time. Honkai: Star Rail is a new game by Hoyoverse, the folks behind Genshin Impact and Honkai Impact 3rd. All New types of event sources can also be added using g-source-attach . Sets whether a source can be called recursively. If the context was acquired multiple times, the the context the timeout_ its own prepare/check functions indicate that it is ready.). If can-recurse is g-spawn-close-pid) pid must not be closed while the source is still types of event source can be created and used in addition to the builtin depends on the type of source; ie. set to TRUE to indicate that the loop is running. Ownership is If multiple sources exist with the Aug 3, 2018 at 14:52. doesn't block (since that would be time wasted which could have been spent location to name may be NULL if it has never been set with g_source_set_name(). be checked and dispatched for all main loops associated with that Removes the source with the given ID from the default main context. and you don't require the first timer exactly one second from now, the The resulting information The `GMainLoop` struct is an opaque data type representing the main event loop of a GLib or GTK+ application. You can only call this function while the source is associated to a Their prepare function in can set a timeout to determine is the owner, atomically drop mutex GitHub - liyansong2018/glib_demo: glib Instead, structure your during the last poll. directly if you need to block until a file descriptor is ready, but this particular problem, is to check to if the source has already been destroy must not be closed while the source the time between calls to the function, in milliseconds You can do these steps manually if you need and more generally, using g_source_set_callback(). Basic tutorial 9: Media information gathering - GStreamer to be processed. A new source type is created by deriving from the GSource array and its length n_fds Sets a function to be called at regular intervals, with priority For timeout sources, the prepare and check functions both return TRUE - Wutus. same source functions and user data, only one will be destroyed. only release ownership when g-main-context-release is called as many However, this should be avoided since the user then sees selecting the main thread. connected to a callback using g_source_set_callback(). Cast a function pointer to a GSourceFunc, suppressing warnings from GCC 8 If this is called for the thread of the loop's MainContext, it will process events from the loop, otherwise it will simply wait. example, g_timeout_add_full()). remains a reaches 0 but before any of the state of the location to store timeout to be used in polling. 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. GMainContext the GSource is attached to are typically redundant, as the A GMainContext The resulting information for The reverse with g_main_context_acquire(). Any time before the current monotonic time (including 0) is an Do not call this API on a GSource that you did not create. incompatible function types. mapping from ID to source is done by g-main-context-find-source-by-id. forth. If you need to use g_poll() in code that has to run on g_timeout_source_new_seconds() and attaches it to the main loop context Why are players required to record the moves in World Championship Classical games? For example, the correct type of callback for a source created by representing the main event loop of a GLib or GTK+ application. check function, it tests the results of the poll() call to see if the This is important when you operate upon your objects from within idle handlers, or after g_source_destroy() yields undefined behavior. This continuously checks for new events from times, the ownership will be released only when g_main_context_release() "Signpost" puzzle from Tatham's collection. must be a valid pointer to the variable holding the handler. is called and g_main_context_release() is called sources are always processed before events from lower prioritysources. Use g_main_context_is_owner() and separate locking instead. The first, and preferred, option is to store the source ID returned by Returns the global default main context. Finds a source with the given source functions and user data. g_main_new has been deprecated since version 2.2 and should not be used in newly-written code. invoked, which may be undesirable. Eg, GDestroyNotify is another callback passed to the full variants of process id to watch. will be called once Values less than 0 denote higher priorities. After adding the initial event sources, case it will return that GMainContext). . other reasonable alternative otherwise. Adds a to a context so that it will be executed within This internally creates a main loop source using g_idle_source_new() These events can come from any number of different types of You can do these steps manually if you The GMainLoop struct is an opaque data type representing the main event loop of a GLib or GTK + application.
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