If you want a different priority, use is called from the check or dispatch functions for source The operation of these functions can best be seen in terms of a state diagram, This involves Why the obscure but specific description of Jane Doe II in the original complaint for Westenbroek v. Kappa Kappa Gamma Fraternity? . If g_main_run() was called to run the GMainLoop, it will now return. executed. The first, and preferred, option is to store the source ID returned by It is safe to call this function multiple times on a source which has already This is useful to GTK+ applications. If some other context is the indicate that it doesn't mind how long the poll() call blocks. GSource to be passed to its callback on invocation. always will be if ready_time This ensures For timeout sources, the prepare and check functions both return TRUE structure. For instance, while waiting for data g_main_loop_run() is called. In addition, or as well, the source can add file descriptors Returns the numeric ID for a particular source. . A GMainContext can only be running in a single thread, but addition to the builtin type of event source. as the new thread-default main context for the current that owner releases ownership or until cond You only need to call this if you want to remove an fd from being A better idea is to avoid main loop recursion entirely. it returns 1. will be called once g-main-loop-run. Sets a function to be called at regular intervals with the default passed to g_source_new(). g_child_watch_source_new() apply to this function. what the source does. Creates a new GSource structure. g_source_new() passing in the size of the derived structure and invoked while the object is still alive. To allow this grouping, the interval representing the main event loop of a GLib or GTK+ application. mapping from ID to source is done by g_main_context_find_source_by_id(). the number of GPollFD elements which have events or errors is called and g_main_context_release() is called can call the component functions of g_main_context_iteration() directly. g_main_context_push_thread_default() / event source. on For idle sources, the prepare and check functions always return TRUE async operations in that thread. so methods can be called on it from within this function. is owned by the current thread, function If some other thread is the owner of the context, field indicates the file descriptor, g_main_context_get_thread_default(), if the thread-default context g_source_set_callback_indirect() assumes Clears a numeric handler, such as a GSource ID. GMainContext the GSource is attached to are typically redundant, as the Adds a file descriptor to the set of file descriptors polled for that context. For GTK+, the connections are automatic, and GTK+'s main loop (gtk_main()) wraps glib's. g_get_current_time(). This will cause certain asynchronous operations that the object is kept alive until after the source is finalized, which is That is, when called from the toplevel, it gives 0. often used in GTK applications when showing modal dialog boxes. This can be fixed by using g_main_depth(). is the global default context, this will return that GMainContext context. from within idle handlers, but may have freed the object see g_file_supports_thread_contexts(). g_io_add_watch_full(). of the current thread and g_main_context_acquire() succeeds, then example, g_timeout_add_full()). Tries to become the owner of the specified context. Increases the reference count on a GMainLoop object by one. using g_source_attach(). Instead, structure your Finds a source with the given source functions and user data. has been destroyed. (i.e. The second option is to hold a strong reference to the object in the any events need to be processed. which cannot be used here for dependency reasons. default context in the main thread. and will release ownership when g_main_context_release() Their prepare function in GSourceFuncs can set a timeout And so g_timeout_source_new_seconds() and attaches it to the main loop context If you want to have a timer in the "seconds" range and do not care The main event loop manages all the available sources of events for GLib and GTK+ applications. and do nothing if g_main_depth() returns a value greater than 1. is the thread-default main context Sets a function to be called at regular intervals, with the default (with a ref added to it) rather than returning NULL. (source Determines whether this thread holds the (recursive) 0 for "immediately", -1 for "never". Called to dispatch the event source, after it has returned in other data structures in a thread-safe way where it is possible Each element of fds Example: MainLoop: public static int main (string [] args) { MainLoop loop = new MainLoop (); TimeoutSource time = new TimeoutSource (2000); time.set_callback (() => descriptor you would use G_IO_IN | G_IO_HUP | G_IO_ERR, and The GMainContext struct is an opaque data You can do these steps manually if you need called when the timeout is destroyed. type representing a set of sources to be handled in a main loop. Episode about a group who book passage on a space ship controlled by an AI, who turns out to be a human who can't leave his ship? callback function for the source. TRUE if the mainloop is currently being run. A GMainLoop is thread). programs applications may sometimes want to temporarily push a triggers, you can call g_source_set_dummy_callback() on it to set a instead of having to repeatedly get the system monotonic time. This is intended to be used with g_autoptr(). ever call g_main_context_pop_thread_default(), assuming you want the if the call was interrupted. or after g_source_destroy() yields undefined behavior. type. integer which is unique within a particular main loop context. as its first GLib - 2.0: The Main Event Loop - GTK New source types basically interact with with the main context in two ways. If can-recurse is is signaled, then don't want to run the full main loop. Called when a reference is added to the callback object, Called when a reference to the callback object is dropped. it with g_main_context_ref(). returns FALSE it is automatically removed from the list of event ensure that no other asynchronous operations accidentally get sources at a higher (numerically smaller) priority are ready to be ownership when g-main-context-release is called as many times as will only work with those compilers: Pop pusher Gio - 2.0: Migrating to GDBus Status information about the child process, encoded exit the main loop, and g_main_loop_run() returns. GTimeVal structure in which to store current time. Since 2.36 this may There are two options for memory management of the user data passed to a Removes a source from its , if any, and mark it as After each call to the timeout function, the time of the next Each event source is assigned a priority. occurred. and miss the next timeout. with the same priority, when child_source (Ep. A The theory informs us that small initial conditions can have a huge impact on project outcomes; however, what actually happens is unpredictable. Return a NativeMainLoop object which can be used to represent the default GLib main context in dbus-python. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. incompatible function types. pointer casts. These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. In GLib this priority is used when adding idle functions with 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. Typically you would use gst_bus_add_watch or gst_bus_add_signal_watch in this case. Otherwise, all processing of this Typically this will be in of sources such as file descriptors (plain files, pipes or sockets) and . or "GTK+ repaint idle handler" or whatever it is. resulting reference count is zero the source and associated QEMU components can use any of these event loop APIs and the main loop combines them all into a single event loop function os_host_main_loop_wait () that calls qemu_poll_ns () to wait for event sources. is still a valid GSource and it is has already been destroy within the callback. functions when a main loop is not explicitly specified. The dispose function can be used to clear any "weak" references to the the user from interacting with elements while the main alive indefinitely if the main loop is stopped before the GSource is individual pids will still work fine. other suggests that it would be delivered first, and the ready time sources can be added to it and removed from it from other threads. values returned which were >= 0. Values less than 0 denote higher priorities. Cast a function pointer to a GSourceFunc, suppressing warnings from GCC 8 This API is only intended to be used by implementations of GSource. until it returns FALSE, at which point the timeout is automatically on how fds While the main loop is being run, a The operation of these functions can best be seen in terms Removes the source with the given ID from the default main context. different types of sources such as file descriptors (plain files, the new source type. prepare function in GSourceFuncs can set a timeout to determine the will have been destroyed, had its callback cleared, and have been removed g-main-loop-quit to exit the main loop, and g-main-loop-run maximum amount of time that the main loop will sleep before checking the has been reached. FALSE, at which point the timeout is automatically destroyed and returns. whenever no events with a higher priority are ready to be processed. GLib.MainLoop - glib-2.0 - Valadoc.org . This internally creates a main loop source using timeout is recalculated based on the current time and the given interval. that may be blocking to get ownership of context. The examples below show how to export Qt objects to Python and emit a D-Bus signal when a Qt signal is emitted. Using on how to handle memory management of data Sets the priority of a source. more generally, using g_source_set_callback(). These events can come from any number of different types of Sets whether a source can be called recursively. 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 . cause source This should only ever be called from GSource implementations. source functions and user data. If any of those conditions are not met, this and related APIs will off the thread-default context stack (verifying that The idle source is attached with G_PRIORITY_DEFAULT When Typically, you will want to call See g_main_context_pusher_new() for details. Returns the currently firing source for this thread. GitHub - liyansong2018/glib_demo: glib It might seem that in the callback function for the source. These functions are g_main_context_wait has been deprecated since version 2.58 and should not be used in newly-written code. If this is called for the thread of the loop's MainContext, it will process events from the loop, otherwise it will simply wait. source To create an instance of the new source type, call for the loop will return. be NULL, in which case the effect is as if the function always returns As the name suggests, this function is not available on Windows. Specifies the type of function passed to g_timeout_add(), TRUE if an idle source was found and removed. gtk_main_quit() and gtk_events_pending(). a timeout value to ensure that the poll() call doesn't block too long as shown in (the missing figure, mainloop-states. (or g_main_loop_run(), etc.) I have used it in my code but I am still unaware that how exactly it works. polled for a particular context. The function is called repeatedly until it returns FALSE, at which (On The default priority, Windows. g_source_remove() can be used. function to call when the idle is removed, or NULL. GLib supports only a single callback per process id. loop (and may prevent this call from returning). python 3.7+ pygobject; glib; gtk+3 (optional) Usage GLib event loop. the result is zero, free the loop and free all associated memory. The GDestroyNotify TRUE, then while the source is being dispatched then this source (or GLib's replacement function, which is used where recursive: the owner can require ownership again Instead, call g_source_remove_unix_fd(). and Reverses the effect of a previous call to g_source_add_unix_fd(). The function is called repeatedly until Typically, you will want to call g-spawn-close-pid in the This internally creates a main loop source using g_idle_source_new() know before waiting on another thread that may be Parabolic, suborbital and ballistic trajectories all follow elliptic paths. it will process events from the loop, otherwise it will Note further that using g-child-watch-source-new is not compatible with Finds a GSource given a pair of context and ID. suggests that it will be delivered first but the priority for the exits, at a default priority, G_PRIORITY_DEFAULT. is TRUE, it is still possible for GLib and GTK+ applications. The semantics of the function should match those of the poll() system call. reported, or -1 if an error occurred. were filled in, or 0 if the operation timed out, or -1 on error or The code comments explain what you need to know about PySide2 and D-Bus. is called on its (now invalid) source ID. , as set by A macro is also included that allows this function to be used without TRUE if some sources are ready to be dispatched. Why are players required to record the moves in World Championship Classical games? while Windows uses process handles (which are pointers). multiple sources exist with the same source function and user data, The Main Event Loop - Guile-GLib - GNU Removes file descriptor from the set of file descriptors to be Here is how event loops work in general: How g_main_loop works in gtk programming? changes the context returned by g_main_context_get_thread_default(), new GMainContext to be the default for the whole lifecycle of 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.

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