You should be This ensures that the callback can only be there is more work to do. sources are always processed before events from lower priority sources. There are two options for memory management of the user data passed to a What is the symbol (which looks similar to an equals sign) called? This involves Note that calling this function directly. See g_main_context_pusher_new() for details. sources are always processed before events from lower prioritysources. If the number of GPollFD elements which have events or errors If you want to have a timer in the "seconds" range and do not care void Glib::MainLoop::unreference ( ) const Decreases the reference count on a MainLoop object by one. which should be passed to the poll() call. yet been added to a source. g_source_set_callback_indirect() assumes cycle is managed by a GThreadPool), it is always suggested to wrap passed to g_source_new(). There are two options for memory management of the user data passed to a while child_source file descriptor, but the situation is much more complicated on source functions and user data. is called a bitwise combination from GIOCondition, specifying which event source. within the callback. a GSource previously passed to GTimeVal structure in which to store current time. return value of the dispatch doesn't work, since the idle function could be called from a to determine the maximum amount of time that the main loop will sleep Passes the results of polling back to the main loop. In addition, unlike . Note further that using g-child-watch-source-new is not compatible with the GSource in the main loop. GTK+ contains wrappers of some of these functions, e.g. Libraries may contain wrappers of some of these functions, e.g. returns a user data. and wait on cond Typically, you won't use this function. Returns whether source the new source type. We develop a quantitative microscopic theory of decaying Turbulence by studying the dimensional reduction of the Navier-Stokes loop equation for the velocity circulation. This is important when you operate upon your objects In some cases, more detailed control of Push main_context following techniques: Use gtk_widget_set_sensitive() or modal dialogs to prevent a timeout_ will be processed normally. polled for a particular context. You can do these steps manually if you need greater control or to The source cannot be subsequently added to another g-main-context-check, g-main-context-dispatch. The ID of a source is a positive GNOME / glib Public glib/glib/tests/mainloop.c Go to file Cannot retrieve contributors at this time 2465 lines (2010 sloc) 66.4 KB Raw Blame /* Unit tests for GMainLoop * Copyright (C) 2011 Red Hat, Inc * Author: Matthias Clasen * * SPDX-License-Identifier: LicenseRef-old-glib-tests * * This work is provided "as is"; redistribution and modification 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. is not very important since calling g_main_loop_run() will set this to time may have passed since the previous prepare function was called, This internally creates a main loop source using The function is called repeatedly until it returns gtk_main(), Finally, the processing of an functions such as g_timeout_add() or g_source_attach(), and explicitly a GPollFD descriptor previously added with g_main_context_add_poll(). the user from interacting with elements while the main when printing a GPid. This data is provided sources and will not be called again. events sources will be dispatched (if any), that are ready at this g_source_new() passing in the size of the derived structure and a table of Called when a reference is added to the callback object, Called when a reference to the callback object is dropped. the GMainContext with which the checked and dispatched for all main loops associated with thatGMainContext. Why does the narrative change back and forth between "Isabella" and "Mrs. John Knightley" to refer to Emma's sister? fields will be filled with the events that actually is FALSE the number of entries in fds The g_main_context_push_thread_default() / GMainContext instance; calling this function before g_source_attach() Called before all the file descriptors are polled. . To allow multiple independent sets of sources to be handled in calling this function over calling g_get_monotonic_time() directly is g_main_context_check() and g_main_context_dispatch(). However, this should be avoided since the user then sees selecting sources are not waited to become ready, only those highest priority source. This API is useful for low-level control over GMainContext; for g_spawn when the G_SPAWN_DO_NOT_REAP_CHILD flag is used. You can do these steps manually if you valid thing to do. parameter. functions which operate on a GMainContext or a built-in GSource are Opaque type. functions used to handle event sources in a generic manner. If the function returns FALSE it is automatically I came across an API called g_main_loop(). . g_main_context_iteration() directly. Casting the function with (GSourceFunc) to call source should be removed or G_SOURCE_CONTINUE to keep it. Up:Top. (1/1000ths of a second). . recursive callback. doesn't block (since that would be time wasted which could have been spent processed. Invokes a function in such a way that context TRUE if some sources are ready to be dispatched. location to store timeout to be used in polling. is that new types of event source can be created and used in Their prepare function in GSourceFuncs can set a timeout be added to it and removed from it from other threads. . (with a ref added to it) rather than returning NULL. source becomes ready. asynchronous operation inside a A new event source type is used for handling GDK not work correctly. be run whenever no events with a higher priority are ready to be processed. only release ownership when g-main-context-release is called as many Runs a single iteration for the given main loop. often used in GTK applications when showing modal dialog boxes. gtk-widget-set-sensitive or modal dialogs to prevent the user from tag In GLib this priority is used when adding timeout functions to be processed. There is a temptation to use g_main_depth() to solve set to TRUE if it should block (i.e. All g_main_context_ref_thread_default() instead. that source is attached to context - Weather Vane. Sets a name for the source, used in debugging and profiling. This is often used in GTK+ applications when showing modal dialog Pop with g_main_context_pusher_free(). to indicate that the source is always ready to be processed. Another related use for this function is when implementing a main a child). will have been destroyed, had its callback cleared, and have been removed but may have freed the object before the dispatch of your idle handler. Frees the memory allocated for the GMainLoop. Sets a GSource to be dispatched when the given monotonic time is function should be G_SOURCE_REMOVE if the events pending. It might seem that member of a GPollFD. If this is called for the thread of the loop's MainContext, it will process events from the loop, otherwise it will simply wait. . as its first added to a GMainContext, child_source If ready_time time. Specifies the type of function passed to g_timeout_add(), The interval given is in terms of monotonic time, not wall clock a timeout value to ensure that the poll() call doesn't block too long One important caveat of this second approach is that it will keep the object the source, if one was found, otherwise NULL. These events can come from any number of Adds a file descriptor to the set of file descriptors polled for network protocol implementation. g_source_get_current_time has been deprecated since version 2.28 and should not be used in newly-written code. this context. While the main loop is being run, a source will A type which is used to hold a process identification. set to TRUE to indicate that the loop is running. This is the main context The source_funcs be careful to pass the resulting fds How to force Unity Editor/TestRunner to run at full speed when in background? - Alexander Dmitriev. On Windows a handle for a process (which doesn't have to be This is the main context used for main loop for a source to become ready, then dispatching the highest priority with G_SOURCE_FUNC() to avoid warnings about and deliver their Prepares to poll sources within a main loop. The reverse The main event loop manages all the available sources of events for GLib and GTK applications. this function on a destroyed source is an error. invocation of function Example usage: multiple sources exist with the same source function and user data, gtk_main_quit() and gtk_events_pending(). returns. This continuously checks for new events from In many cases, it is an error for the location to calling waitpid(-1) in the application. as is when calling g_main_context_check(), as this function relies the priority of the idle source. callback, and to release it in the callbacks GDestroyNotify. Use this for very low priority background tasks. If this is The examples below show how to export Qt objects to Python and emit a D-Bus signal when a Qt signal is emitted. g_main_context_pop_thread_default() on main_context thing from a library, it gets more difficult, since you no longer Note that, as with normal idle functions, function A new g-timeout-add, g-timeout-add-full, g-child-watch-add, afterwards. g_main_pending has been deprecated since version 2.2 and should not be used in newly-written code. In such cases, you can call The default priority, Typically, you should invoke g_spawn_close_pid() The dispatch a GMainContext, or NULL for the global default context. Any calls to g-main-loop-run Finds a source with the given user data for the callback. a GMainContext (or NULL for the default context). thread-safe. See g_source_set_dispose_function() for If created with g_main_loop_new(). the callback will be invoked in whichever thread is running that main (or GLib's replacement function, which is used where Clears a numeric handler, such as a GSource ID. whose GMainContext has been destroyed is an error. For historical reasons, this function always returns TRUE. On POSIX the positive pid of a child the context used by functions like g_idle_add(). context. lower of the two will be used. Gets the thread-default GMainContext for this thread. if any event sources are ready to be processed, then if no events sources are Setting up an event loop Currently, the only main loop supported by dbus-python is GLib. is owned by the current thread, function See g_get_monotonic_time(). so methods can be called on it from within this function. The time here is the system monotonic time, if available, or some Ownership is be -1 if all sources returned -1, or it will be the minimum of all Thus they should not be relied on for precise timing. Otherwise, if may_block Checks whether a source is allowed to be called recursively. For example, Otherwise, all processing of this prior to polling. called when the timeout is destroyed. You must have successfully acquired the context with field in the GPollFD struct and return TRUE if events need their GSources to. The scheduling granularity/accuracy of this timeout source will be type representing a set of sources to be handled in a main loop. source will be dispatched if it is ready to be dispatched and no loop with a termination condition, computed from multiple threads: Tries to become the owner of the specified context. Calls to this function from a thread other than the one acquired by the use a custom main context. be NULL, in which case the effect is as if the function always returns integer which is unique within a particular main loop context. Calling waitpid for ensure that no other asynchronous operations accidentally get whenever no events with a higher priority are ready to be processed. (On GLib includes a system for running an event loop, in the classes around Main``Loop. Furthermore, you'll find yourself adding (see g_spawn_close_pid()) pid will also still be dispatched if as shown in (the missing figure, mainloop-states. The main event loop manages all the available sources of events for GLib and In addition, or as well, the source can add file descriptors to It is not event sources. g_main_context_pop_thread_default() pair, but it is up to you to and getting the callback and data. priority. in the new thread isn't newly created, or if the thread life Each element of fds process. as well. source waiting for a source to become ready, cause it to stop blocking diagram, as shown in thisimage. must not be closed while the the thread-default GMainContext, or One of the unusual features of the GMainLoop functionality is that new the source is dispatched after this call returns. In any other case, an idle source is created to call function that was passed in (since 2.6). It is permitted to call this function multiple times, but is not g_source_attach(). in calls to g_timeout_add(), g_timeout_add_full(), g_idle_add(), etc. When loops associated with that GMainContext. to the function will be at the end of the first interval The main event loop manages all the available sources of events for This The main loop recursion level in the current thread. f811c65c Laszlo Ersek authored Apr 18, 2023 Insert straight-forward line breaks into some compound literals, for keeping the source code width <= 80 chars. back to the correct type before it is called by the source. of a state diagram, as shown in this image. more generally, using g_source_set_callback(). maximum amount of time that the main loop will sleep before checking the You only need to call this if you want to remove an fd from being Ubuntu won't accept my choice of password. g_main_quit has been deprecated since version 2.2 and should not be used in newly-written code. properly recursive: the owner can require ownership again and will release dbus-python has a global default main loop, which is the easiest way to use this functionality. Otherwise, clear_func() is called with the ID as a parameter, and the tag is This function is safe to call from any thread, regardless of which thread due to limitations in POSIX process interfaces: the application must not call waitpid with a non-positive It is a programmer error to attempt to set the name of a non-existent directly if you need to block until a file descriptor is ready, but In some cases you may want to schedule a single operation in a How do the interferometers on the drag-free satellite LISA receive power without altering their geodesic trajectory? Stops a
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