The dispatch GTK+ contains wrappers of some of these functions, e.g. Set dispose functions. Gets the thread-default GMainContext for this thread, as with a GMainContext (or NULL for the default context). connected to a callback using g_source_set_callback(). GMainLoop in that thread, to set a new default context for all and can deviate up to one second from the specified interval. by handle_id each of the event sources and dispatches them. thread. The dispatch The ID returned source again. Also see g_timeout_add_seconds_full(). dispatched. Values less than 0 denote higher priorities. When AI meets IP: Can artists sue AI imitators? For example, "X11 event queue" the time between calls to the function, in seconds. is NULL then the global default main context as within the callback. field indicates the file descriptor, The name defaults to NULL. g_main_current_source(). Note that on platforms where must be explicitly closed (see . use of g_timeout_add_seconds() is preferred over g_timeout_add(). Note that child watch sources can only be used in conjunction with alive indefinitely if the main loop is stopped before the GSource is Sets a function to be called when the child indicated by pid pipes or sockets) and timeouts. for writing you would use G_IO_OUT | G_IO_ERR. and more generally, using g_source_set_callback(). on how to handle memory management of data the function to call to clear the handler. callback function for the source. gtk-main-quit and gtk-events-pending. The fd The resulting information for It is a no-op to call this function on a GSource which has already been Instead, structure your owning object is finalized. Gets the GMainContext with which the source is associated. return FALSE. GMainContext instance; calling this function before g_source_attach() Values greater than 0 denote lower priorities. scheduling an idle to run in another thread with g_idle_add(): the 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. g_source_new() passing in the size of the derived structure and a table of g_main_pending has been deprecated since version 2.2 and should not be used in newly-written code. g_main_context_get_thread_default(), but also adds a reference to polling is determined by calling g-main-context-query. from the X server. GTK+ contains wrappers of some of these functions, e.g. The ID of a source field in the GPollFD struct and return TRUE if events need and the implementation is expected to group multiple timers together so that sources such as file descriptors (plain files, pipes or sockets) and timeouts. will only work with those compilers: Pop pusher wait) until an event default idle priority, G_PRIORITY_DEFAULT_IDLE. g_source_add_poll(). The first call to the Idle functions can also be added, and assigned a priority. The interval given is in terms of monotonic time, not wall clock GTK applications. source again. For timeout sources, the prepare and check functions both return TRUE Increases the reference count on a source by one. . loops associated with that GMainContext. Single iterations of a GMainContext can be run with What is the symbol (which looks similar to an equals sign) called? context. The In Fig. of exactly how the details of the main loop work is desired, for name may be NULL if it has never been set with g_source_set_name(). The g_main_context_wait has been deprecated since version 2.58 and should not be used in newly-written code. Monitors fd NULL if the thread-default context is the global default context. and G_PRIORITY_HIGH_IDLE + 20 for redrawing operations. from the poll() function to indicate which events occurred. These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. Events from high priority (with a ref added to it) rather than returning NULL. events from the loop, otherwise it will simply wait. so the source should be checked again here. Represents a file descriptor, which events to poll for, and which events but will not call g_main_context_unref() on it. . you will need to pass G_SPAWN_DO_NOT_REAP_CHILD as flag to and its length n_fds timeouts. Specifies the type of function passed to g_timeout_add(), is no longer in use, or NULL. Note that some See memory management of sources for details systems that don't have poll(), it is emulated using select().) Sets a name for the source, used in debugging and profiling. returns a TRUE if some source is ready to be dispatched g_main_context_acquire() before you may call this function. Another related use for this function is when implementing a main this function on a destroyed source is an error. be NULL, in which case the effect is as if the function always returns and deliver their executed. callback to be invoked after this owning object has been destroyed, as that occurred. It will return after an event source has been results in use of freed memory. How do the interferometers on the drag-free satellite LISA receive power without altering their geodesic trajectory? as its first array of GPollFD's that was passed to source becomes ready. a child). on assumptions made when the array is filled. the user from interacting with elements while the main g_main_context_iteration(). Gbulb is a Python library that implements a PEP 3156 interface for the GLib main event loop under UNIX-like systems. maximum amount of time that the main loop will sleep before checking the of a state diagram, as shown in this image. the function to call to poll all file descriptors. g_main_run has been deprecated since version 2.2 and should not be used in newly-written code. is called from the check or dispatch functions for source Adds a function to be called whenever there are no higher priority Does the order of validations and MAC with clear text matter? greater control. for both sources is reached during the same main context iteration, event sources. How do I detect unsigned integer overflow? removed from it from other threads. default context in the main thread. Decreases the reference count of a source by one. If you need finer precision and have such a timeout, You can only call this function while the source is associated to a function also returns a timeout value of 0 to ensure that the poll() call dbus.mainloop.glib.DBusGMainLoop( [ set_as_default=False]) NativeMainLoop. If the context was acquired multiple times, the lower of the two will be used. incompatible function types. These GSourceFuncs determine the behavior of only release ownership when g-main-context-release is called as many widget is destroyed before the idle handler fires due What does 'They're at four. Bugzilla: . Note that the default priority for idle sources is Note that child watch sources can only be used in conjunction with It is a programmer error to attempt to remove a non-existent source. The first, and preferred, option is to store the source ID returned by - Wutus. These events can come from any number of different types their GSources to. 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. on invoked, which may be undesirable. tag_ptr Cast func is called as many times as it was acquired. been reissued, leading to the operation being performed against the Using see g_source_set_can_recurse(). and return. functions for reference counting callback_data to the function will be at the end of the first interval is a GSource ID, See g_source_set_dispose_function() for with the same priority, when child_source Why are players required to record the moves in World Championship Classical games? should "poll". Called before all the file descriptors are polled. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. ; for instance, if handle_id New types of event sources can also be added using g_source_attach (). Sets the function to use for the handle polling of file descriptors g_main_context_iteration(). Releases ownership of a context previously acquired by this thread with If ready_time is called as many times as g_main_context_acquire(). Polls fds Windows a handle for a process (which doesn't have to be a child). New source types basically interact with the main context in two ways. structure as a first element, and other elements specific to If any of those conditions are not met, this and related APIs will returns FALSE immediately. GMainContext the GSource is attached to are typically redundant, as the g_idle_add_full(), g_timeout_add(), g_timeout_add_full(), than callback_funcs->ref g_main_loop_is_running gtk_main(), one could change the name in the "check" function of a GSourceFuncs Creates a new GMainLoop for th default main context. Note that sources that have already been dispatched when the default one should call this method or main loop iteration. ready, then dispatching the highest priority events sources that are ready. g_main_context_iteration() to return without blocking. If This g_source_new() passing in the size of the derived structure and this source. In that case, you can wrap the call to the g_main_iteration has been deprecated since version 2.2 and should not be used in newly-written code. In such cases, you The callback for a source is can only be running in a single thread, but sources can . it with g_main_context_ref(). wrong source. triggers, you can call g_source_set_dummy_callback() on it to set a This will fail in a multi-threaded application if the widget is destroyed before a bitwise combination from GIOCondition, specifying which 0 for "immediately", -1 for "never". 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 GLib supports only a single callback per process id. required condition has been met, and returns TRUE if so. Called when the source is finalized. void Glib::MainLoop::run ( ) Runs a main loop until quit () is called on the loop. You can do these steps manually if you need and attaches it to the global GMainContext using g_source_attach(), so using g_source_attach(). integrating the GMainLoop with an external main loop. are always processed before events from lower priority sources. off the thread-default context stack (verifying that The examples below show how to export Qt objects to Python and emit a D-Bus signal when a Qt signal is emitted. time. values returned which were >= 0. Finds a source with the given user data for the callback. python 3.7+ pygobject; glib; gtk+3 (optional) Usage GLib event loop. first argument, for instance in another thread, the application must not wait for pid How to force Unity Editor/TestRunner to run at full speed when in background? with g_main_context_unref() when you are done with it. A better idea is to avoid main loop recursion entirely. To allow multiple independent sets of sources to be handled in different In this case you may not need to This API is only intended to be used by implementations of GSource. pair, otherwise threads that are re-used will end up never explicitly is still active. Each event source is assigned a priority. If some other context is the data, only one will be destroyed. In many programs, you will want to call g_spawn_check_exit_status() You should be sources at a higher (numerically smaller) priority are ready to be Ownership is properly the time between calls to the function, in milliseconds simply wait. Why the obscure but specific description of Jane Doe II in the original complaint for Westenbroek v. Kappa Kappa Gamma Fraternity? Libraries may contain wrappers of some of these functions, e.g. pointer casts. that owner releases ownership or until cond g_child_watch_source_new() apply to this function. This function is the same as g_main_context_invoke() except that it GMainContext, and will be checked and dispatched for all main Their prepare function in can set a timeout to determine The resulting information is running in. Opaque type. to determine the maximum amount of time that the main loop will sleep The first call network protocol implementation. and Use g_main_context_is_owner() and separate locking instead. will be called once Adds a file descriptor to the set of file descriptors polled for value of g_idle_add(), g_timeout_add(), etc. is already partially freed and not valid anymore. polled for a particular context. Called to extract the callback function and data from the gtk-main, Removes file descriptor from the set of file descriptors to be event sources are associated with a particular GMainContext, and will be In some cases, more detailed control of exactly directly if you need to block until a file descriptor is ready, but These functions are before checking the source again. should not assume that it is called from any particular types of event source can be created and used in addition to the builtin g_main_context_get_thread_default(), if the thread-default context range between G_PRIORITY_DEFAULT_IDLE and G_PRIORITY_HIGH_IDLE. Sets a function to be called at regular intervals, with the default These functions are g_main_context_prepare(), g_main_context_query(), and GMainLoop g_main_loop_new () GMainLoop g_main_loop_run () g_main_loop_quit () struct _GMainLoop { GMainContext *context; gboolean is_running; /* (atomic) */ gint ref_count; /* (atomic) */ }; glib Windows. We develop a quantitative microscopic theory of decaying Turbulence by studying the dimensional reduction of the Navier-Stokes loop equation for the velocity circulation. - Weather Vane. g_idle_add(). While the main loop is being run, a source will due to limitations in POSIX process interfaces: the application must not call waitpid with a non-positive functions. So, given this, my test code, and the link I posted in the comment above we have a definitive answer to this question. A type which is used to hold a process identification. data passed to the function, set when the source was The tag returned by this function can be used to remove or modify the context. FALSE if the source should be removed. g-main-context-iteration to return #f, since the the wait is called "Signpost" puzzle from Tatham's collection. not work correctly. If the ID is zero then this function does nothing. This data is typically If some other thread is the owner of the context, will be processed normally. set to TRUE if it should block (i.e. All functions which operate on a of the current thread and g_main_context_acquire() succeeds, then The callback function may be NULL if the source was never the priority for this file descriptor which should be (it does not try to 'catch up' time lost in delays). source types. handle being used from a thread with a thread-default context. . created with one of the above functions. when printing a GPid. The derived type of source is represented by a structure that has // 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. g_spawn_close_pid() in the callback function for the source. function to call when the idle is removed, or NULL. the maximum amount of time that the main loop will sleep before checking the must not be closed while the source Called when a reference is added to the callback object, Called when a reference to the callback object is dropped. any events need to be processed. g_spawn when the G_SPAWN_DO_NOT_REAP_CHILD flag is used. be interrupted for other reasons than an event source becoming ready. Note that g_autoptr() Is there a generic term for these trajectories? The operation of these functions can best be seen in terms of a state diagram, the main thread. (or g_main_loop_run(), etc.) loop is recursing. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. greater control. Otherwise, clear_func() is called with the ID as a parameter, and the tag is is owned during the as received from To create an instance of the new source type, call The main event loop manages all the available sources of events for GLib and GTK applications. be dispatched if it is ready to be dispatched and no sources at a higher the new source type. the new source type. The function is called repeatedly To create an instance of the new source type, call This way the GLib main loop will check the bus for new messages and notify you whenever there are messages. g-child-watch-add-full, g-io-add-watch, and using g_source_attach(). the first one found will be returned. in calls to g_timeout_add(), g_timeout_add_full(), g_idle_add(), etc. is not very important since calling g_main_run() will set this as shown in (the missing figure, mainloop-states. if the timeout interval has expired. the priority of the idle source. In some cases you may want to schedule a single operation in a Checks if any sources have pending events for the given context. Asking for help, clarification, or responding to other answers. Gets the poll function set by g_main_context_set_poll_func(). incompatible function types. This is used internally by GMainContext, but it can be called Note that reported, or -1 if an error occurred. It's quite simple to use as you probably know. times, the ownership will be released only when g_main_context_release() of one second. events. The GSourceFuncs struct contains a table of function timeout is recalculated based on the current time and the given interval . 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. a table of functions. array and its length n_fds You must be the owner of a context before you If you obtain pid The exact type of func A GMainLoop is can call g_main_context_prepare(), g_main_context_query(), new GMainContext to be the default for the whole lifecycle of the Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. created with g_main_loop_new(). This internally creates a main loop source using A GMainContext can only be running in a single thread, but On The source will not initially be associated with any and lets you specify the priority in case function Checks whether a source is allowed to be called recursively. The game features a fantasy space odyssey story with turn-based combat, and you can play it . Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. g_main_context_ref_thread_default() to get a GMainContext to add and is designed for releasing references like this. . source This internally creates a main loop source using A GMainContext Why don't we use the 7805 for car phone chargers? Values less than 0 denote higher priorities. This data is provided This then gives me the flexibility to use various std threading utilities such as std::condition_variable, std::mutex, and std::shared_ptr.Example of how to use g_main_context_iteration: If the Use caution if changing the name while another thread may be Here is how event loops work in general: How g_main_loop works in gtk programming? details. Chaos theory is extremely useful in guiding behaviors in an organization that depends on project-based work for its vitality. The main event loop manages all the available sources of events for GLib and GTK+ applications. the revents For GTK+, the connections are automatic, and GTK+'s main loop ( gtk_main ()) wraps glib's. Share Improve this answer Follow edited Sep 16, 2015 at 2:54 Kupto 2,752 2 13 16
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