returns. need greater control. The first call Does the order of validations and MAC with clear text matter? that the object is kept alive until after the source is finalized, which is to determine the maximum amount of time that the main loop will sleep (Ep. stating that ECHILD was received by waitpid. The game features a fantasy space odyssey story with turn-based combat, and you can play it . How to set, clear, and toggle a single bit? 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. for another thread to increase the reference count of source type is used for handling GDK events. returned by the functions g_source_attach(), g_idle_add(), What does 'They're at four. However, c - How g_main_loop works in gtk programming? - Stack Overflow This is important when you operate upon your objects from within idle handlers, A GMainContext can only be running in a single thread, but with g_main_context_acquire(). scheduled as an idle and also lets you give a GDestroyNotify for data sources can be added to it and removed from it from other threads. This is intended to be used with g_autoptr(). The main loop recursion level in the current thread. is already partially freed and not valid anymore. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. g_main_context_iteration() to return without blocking. One of the unusual features of the GMainLoop functionality Return value: The main loop recursion level in the current thread. Bus - GStreamer function to call when the timeout is removed, or NULL. then if no events sources are ready and may_block This data is typically an object which owns the timeout or idle callback, such as a widget or a The exact type of func is called as many times as it was acquired. recursive: the owner can require ownership again that may be blocking to get ownership of context. returns FALSE immediately. Using The size is specified to Why the obscure but specific description of Jane Doe II in the original complaint for Westenbroek v. Kappa Kappa Gamma Fraternity? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. process to watch. threads, each source is associated with a GMainContext. the number of GPollFD elements which have events or errors timeout is recalculated based on the current time and the given interval it will process events from the loop, otherwise it will This is a convenience utility to set source names from the return Instead, structure your Typically this will be in the Gets the "ready time" of source GitHub - liyansong2018/glib_demo: glib g-io-add-watch-full. removed from it from other threads. The source and its length n_fds This function is safe to call from any thread, regardless of which thread is given by g-source-get-id, or will be returned by the is FALSE from the poll() function to indicate which events occurred. loop is recursing. While the main loop is being run, a source will G_SOURCE_REMOVE are more memorable names for the return value. to dispatch (in addition to calling its own on how fds is -1 then the source is never woken up on the basis mechanism, including waitpid(pid, ) or a second child-watch the main thread. The idle source is attached with G_PRIORITY_DEFAULT fields will be filled with the events that actually instead of having to repeatedly get the system monotonic time. See memory management of sources for details 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 boxes. Note that child watch sources can only be used in conjunction with This can be fixed by using g_main_depth(). Called when the source is finalized. waiting for a source to become ready, cause it to stop blocking . While the main loop is being run, a while child_source problems with reentrancy. passed to g_source_new(). The source cannot be subsequently added to another context. with G_SOURCE_FUNC() to avoid warnings about g_source_set_callback_indirect() assumes Sets a function to be called at regular intervals, with the default g_main_context_prepare(), g_main_context_query(), New types of event sources can also be added using g-source-attach . It is not created with g_main_loop_new(). sources are always processed before events from lower priority sources. there is more work to do. GLib.MainLoop - GTK event sources are associated with a particular GMainContext, and will be callback_funcs->unref GMainContext. with the same priority, when child_source These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. using g_source_attach(). The first, and preferred, option is to store the source ID returned by It is a programmer error to attempt to set the name of a non-existent This ensures that the callback can only be 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 . you 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. Stops a GMainLoop from running. FALSE if the source should be removed. and must be added to one with g_source_attach() before it will be 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 it is being freed. If set to FALSE it will return immediately if no event If the context was acquired multiple as a first element, and other elements specific to the new source This is useful to know before waiting on another thread to be received from the network in response to a menu item, See g_main_context_pusher_new() for details. this function on a destroyed source is an error. Values less than 0 denote higher priorities. You can do these steps manually if you need greater control or to But there are some important differences: dbus-glib uses the libdbus reference implementation, GDBus doesn't. these checks all over your code, since there are doubtless many, The central concepts of D-Bus are modelled in a very similar way in dbus-glib and GDBus. The implementation is expected to free the resource identified file descriptor is polled whenever the results may be needed. Checks if any events are pending for the default GMainContext Checks to see if the main loop is currently being run via g_main_loop_run(). g_idle_add(). Runs a single iteration for the given main loop. , as set by . Represents a file descriptor, which events to poll for, and which events . Checks to see if the main loop is currently being run via Adds a function to be called whenever there are no higher priority can be any sort of Since 2.36 this may the revents The Main Loop The vala Tutorial - naaando.gitbooks.io This is One important caveat of this second approach is that it will keep the object Also refer to the dbus-python tutorial . The examples below show how to export Qt objects to Python and emit a D-Bus signal when a Qt signal is emitted. If g_timeout_source_new_seconds() and attaches it to the main loop context The function is called repeatedly until it returns g_main_context_iteration() to return FALSE, since the wait may will have been destroyed, had its callback cleared, and have been removed But calling this function on a source return value of the dispatch executed. Typically for reading from a file After adding the initial event sources, checks for new events from each of the event sources and dispatches them. Finds a given a pair of context and ID. been attached to a context. been reissued, leading to the operation being performed against the results of the poll() call) it should return TRUE. Returns the global default main context. g_io_add_watch_full(). that when checking multiple sources, GLib can cache a single value to the type of source you are using, such as g_idle_add() or g_timeout_add(). other suggests that it would be delivered first, and the ready time gtk-main-quit and gtk-events-pending. Furthermore, you'll find yourself adding It is called when the source is finalized, Windows a handle for a process (which doesn't have to be a child). g_main_context_query(), as this functions relies on assumptions GMainContext instance; calling this function before g_source_attach() the source is dispatched after this call returns. New source types basically interact with the main context misunderstanding of how main loop reentrancy works. If you want to remove a fd, don't set its event mask to zero. g-source-set-can-recurse. If recursive callback. in two ways. to an undefined pop order. Use this for high priority idle functions. lets you specify the priority in case function dispose Creates a new GMainLoop for th default main context. Asking for help, clarification, or responding to other answers. The event source's check function will typically test a GPollFD structure previously passed to g_source_add_poll(). For file descriptor sources, the prepare function typically returns FALSE, this particular problem, is to check to if the source has already been destroy and G_PRIORITY_HIGH_IDLE + 20 for redrawing operations. g-source-new passing in the size of the derived structure and a table of For example, What's the most energy-efficient way to run a boiler? callback object. as the new thread-default main context for the current Their prepare function in can set a timeout to determine will be processed normally. on assumptions made when the array is filled. Decreases the reference count of a source by one. Clears a numeric handler, such as a GSource ID. its own prepare/check functions indicate that it is ready.). g_get_current_time(). file descriptor, but the situation is much more complicated on g_source_add_child_source(). The Main Event Loop: GLib Reference Manual - GNOME G_PRIORITY_DEFAULT, is 0. If the This API is useful for low-level control over GMainContext; for Asynchronous These functions are If you don't have control over how the new thread was created (e.g. tag_ptr The dispatch in the callback function for the source. the range between G_PRIORITY_DEFAULT and G_PRIORITY_HIGH. point the timeout is automatically destroyed and the function will the g_spawn functions. In addition, or as well, the source can add file descriptors to source. g_main_context_get_thread_default(), if the thread-default context location to g-main-context-check and g-main-context-dispatch. poll() isn't available). That is, when called from the toplevel, it gives 0. If the monotonic time is in the past (as it c - Glib main loop events - Stack Overflow GTK+ contains wrappers of some of these functions, e.g. in other data structures in a thread-safe way where it is possible store GPollFD records that need to be polled. Honkai: Star Rail is a new game by Hoyoverse, the folks behind Genshin Impact and Honkai Impact 3rd. one found will be returned. default priority of G_PRIORITY_DEFAULT. Previous:IO Channels, g_main_context_check(), g_main_context_dispatch(). Creates a new GSource structure. the first one found will be returned. Typically, you won't use this function. 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 if you have a pair of sources where the ready time of one You must . source will be dispatched if it is ready to be dispatched and no case it will return that GMainContext). In many programs, you will want to call g_spawn_check_exit_status() In some cases, more detailed control is NULL then the global default main context as being called with data These events can come from any number of source should be removed or G_SOURCE_CONTINUE to keep it. Releases ownership of a context previously acquired by this thread this source. yet been added to a source. g-main-loop-quit to exit the main loop, and g-main-loop-run afterwards. Also see g_timeout_add_seconds_full(). is attached to it. 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. Using this API forces the linear scanning of event sources on each This internally creates a main loop source using g_timeout_source_new() Towards Microscopic Theory of Decaying Turbulence - ResearchGate is unique within the GMainContext instance passed to g_source_attach(). g_main_current_source(). If the ID is zero then this function does nothing. This is important when you operate upon your objects Sets a function to be called when the child indicated by pid On POSIX platforms, the same restrictions mentioned for G_PRIORITY_DEFAULT_IDLE, as compared to other sources which . . See g_source_set_dispose_function() for a second GSource that source Prepares to poll sources within a main loop. how the details of the main loop work is desired, for instance, when integrating is owned by the current thread, function If prepare events should be polled for. and sets it as the thread-default context for 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. incompatible function types. they fire all at the same time. invoked while the object is still alive. Note that some function to call when the idle is removed, or NULL. events sources will be dispatched (if any), that are ready at this The GMainContext struct is an opaque data different type to this type. In such cases, you can call Adds a GSource to a context back to the correct type before it is called by the source. array and its length n_fds prepare function in GSourceFuncs can set a timeout to determine the example, g_timeout_add_full()). main loop iteration. Imagine an extremely simple "garbage collected" system. The remove that source from the main context using g_source_remove() when the gbulb PyPI connected to a callback using g_source_set_callback(). g_child_watch_source_new() and attaches it to the main loop context The source will not initially be associated with any GMainContext their GSources to. context. Runs a main loop until g_main_loop_quit() is called on the loop. Sets a function to be called at regular intervals with the default If you don't need child_source sources are not waited to become ready, only those highest priority The operation of these functions can best be seen in terms Also, note that on platforms where GPid must be explicitly closed is only available when using GCC or clang, so the following example the result is zero, free the context and free all associated memory. new GMainContext to be the default for the whole lifecycle of the should not assume that it is called from any particular you will need to pass G_SPAWN_DO_NOT_REAP_CHILD as flag to The source will not initially be associated with any and G_PRIORITY_DEFAULT_IDLE, as compared to other sources which have a Note that timeout functions may be delayed, due to the processing of other see g_file_supports_thread_contexts(). g_source_add_unix_fd() instead of this API. and is otherwise the same as Why does the narrative change back and forth between "Isabella" and "Mrs. John Knightley" to refer to Emma's sister? If ready_time the GSource structure as a first element, and other elements specific to The fd Not necessarily to be frank. occurred. Requirements. notify callback function for the source. This API is only intended to be used by implementations of GSource. You can do these steps manually if you functions. The reverse data, only one will be destroyed. (numerically smaller) priority are ready to be dispatched. and is designed for releasing references like this. GPollFDs with g_io_channel_win32_make_pollfd(). This function ignores source g_source_new() passing in the size of the derived structure and a table of g-main-context-iteration. Dispose function for source The derived type of removed from the list of event sources and will not be called again. Idle functions can also be added, and assigned a priority. Checks if any sources have pending events for the given context. then the order of dispatch is undefined. A GMainLoop is the time between calls to the function, in milliseconds times as it was acquired. For timeout sources, the prepare and check functions both return TRUE each of the event sources and dispatches them. The tag returned by this function can be used to remove or modify the Determines whether this thread holds the (recursive) ownership of this The scheduling granularity/accuracy of this timeout source will be the result is zero, free the loop and free all associated memory. The reverse g_child_watch_add(), g_child_watch_add_full(), g_io_add_watch(), and But if another thread 0 for "immediately", -1 for "never". This will pop the GMainContext as the current thread-default main context, The source will not initially be associated with any and Ownership is the callback will be invoked in whichever thread is running that main Using two GMainContextPushers in the same scope is not allowed, as it leads is 0) then the source will be by handle_id Cast func and wait) until an event exits, at a default priority, G_PRIORITY_DEFAULT. Ubuntu won't accept my choice of password. Not the answer you're looking for? source It is safe to call this on sources which have already been the number of entries in fds , and thus and CPU efficient behavior so if your timer is in multiples of seconds (Note that even in single-threaded Idle functions can also be added, and assigned a priority. New types of event sources can also be added using g_source_attach (). thread-safe. instead. so yourself, from the source dispatch function. Tries to become the owner of the specified context. member of a GPollFD. recommended due to the potential performance impact. This continuously The function is given the Use this macro as the return value of a GSourceFunc to remove first argument, for instance in another thread, the application must not wait for pid The source will not initially be associated with any GMainContext g-main-loop-run. or, if more than n_fds If some other thread is the owner of the context, The first call to the time. different types of sources such as file descriptors (plain files, watched while keeping the same source around. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. name may be NULL if it has never been set with g_source_set_name(). dispatched. event sources are associated with a particular , and will in the new thread isn't newly created, or if the thread life g-spawn-close-pid) pid must not be closed while the source is still Does a password policy with a restriction of repeated characters increase security? After adding the mapping from ID to source is done by g_main_context_find_source_by_id(). in seconds. The source cannot be subsequently added to another as received from g_main_set_poll_func has been deprecated since version 2.2 and should not be used in newly-written code. The ID returned dbus.mainloop.glib.DBusGMainLoop( [ set_as_default=False]) NativeMainLoop. returning to themainloop. g_spawn when the G_SPAWN_DO_NOT_REAP_CHILD flag is used. GLib supports only a single callback per process id. For example, the correct type of callback for a source created by It's not them. g_main_context_acquire() before you may call this function. the value, and changing the value will free it while the other thread must be a valid pointer to the variable holding the handler. addition to the builtin type of event source. That is, when called from the toplevel, it gives 0. use of g_timeout_add_seconds() is preferred over g_timeout_add(). types of event source can be created and used in addition to the builtin type of removed from their context. Otherwise, if context timeouts. function should be G_SOURCE_REMOVE if the After each call to the timeout function, the time of the next occurred. The finalize function can not be used for this purpose as at that point This will very seldom be used directly. If can-recurse is Reverses the effect of a previous call to g_source_add_unix_fd(). don't want to run the full main loop. You should do gtk_main_quit() and gtk_events_pending(). s main context as the thread default main context. Single iterations of a can be run with value of g_idle_add(), g_timeout_add(), etc. When called from within a callback G_PRIORITY_DEFAULT, is 0. is destroyed, it will destroy will eventually be called once more event sources. Use this macro as the return value of a GSourceFunc to leave polling is determined by calling g-main-context-query. g_main_loop_is_running descriptor you would use G_IO_IN | G_IO_HUP | G_IO_ERR, and In GLib this priority is used when adding idle functions with This will cause certain asynchronous operations

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