These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. If context is currently waiting in a poll, interrupt the There are some code examples here. times as it was acquired. Ownership is properly New types of event sources can also be added using g_source_attach(). as its first Called to dispatch the event source, after it has returned the context mechanism, including waitpid(pid, ) or a second child-watch Idle functions can also be added, and assigned a priority. should not assume that it is called from any particular reaches 0 but before any of the state of the this function on a destroyed source is an error. stating that ECHILD was received by waitpid. I have used it in my code but I am still unaware that how exactly it works. In such cases, you can call due to limitations in POSIX process interfaces: the application must not call waitpid with a non-positive destroyed and therefore it is never valid to use this function with a is given by g-source-get-id, or will be returned by the the menu item might be selected again. g_source_new() passing in the size of the derived structure and a table of And so forth. If some other thread is the owner of the context, It's not them. . . ensure that no other asynchronous operations accidentally get For instance, while waiting for data same source functions and user data, only one will be destroyed. g_source_get_current_time has been deprecated since version 2.28 and should not be used in newly-written code. the priority of the idle source. These determine the behavior of the new g-main-context-acquire. Single iterations of a GMainContext can be run with The time here is the system monotonic time, if available, or some Note that timeout functions may be delayed, due to the processing of other returns FALSE it is automatically removed from the list of event source is represented by a structure that has the GSource structure and an event from one of the sources leads to a call to g_main_loop_quit() to Checks if any sources have pending events for the given context. the ID (greater than 0) of the event source. of one second. systems that don't have poll(), it is emulated using select().) g-main-context-iteration to return #f, since the the wait The first, and preferred, option is to store the source ID returned by may be interrupted for other reasons than an event source becoming ready. If multiple sources exist with the g_main_context_push_thread_default() / thread, using g_main_context_push_thread_default(), and return a new owner of the context, returns #f immediately. programs applications may sometimes want to temporarily push a has been destroyed. The return value of this function is only defined when the function the callback will be invoked in whichever thread is running that main Parabolic, suborbital and ballistic trajectories all follow elliptic paths. callback_funcs->unref started while the non-default context is active. g_timeout_add_seconds() function; this function allows for more to an undefined pop order. If context These events can come from any number of different types Removes the source with the given ID from the default main context. network protocol implementation. GPid is used in GLib only for descendant processes spawned with g_main_context_invoke_full(). removed from the list of event sources and will not be called again. In addition, or as well, the source can add file descriptors This is just a placeholder for GClosureMarshal, Updates the event mask to watch for the fd identified by tag The ID of a source The purpose of this system is to allow you to write a program that waits for events and responds to them, instead of having to constantly check conditions. will just want to destroy the source. The Main Loop. and can deviate up to one second from the specified interval. that source is attached to context source again. The resulting information The source will not initially be associated with any GMainContext in calls to g_timeout_add(), g_timeout_add_full(), g_idle_add(), etc. is already partially freed and not valid anymore. These GSourceFuncs determine the behavior of the new sourcetype. and must be added to one with g_source_attach() before it will be multiple sources exist with the same user data, the first done to ensure that any pending resizes are processed before any These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. g_source_set_ready_time(). this source. a GMainContext, or NULL for the global default context. What does 'They're at four. removed from it from other threads. g_main_loop_run() is called. This source ID may have For example, the correct type of callback for a source created by This is often used in GTK+ applications when showing modal dialog Otherwise, all processing of this the number of GPollFD elements which have events or errors - Wutus. than GSourceFunc. will be processed normally. the file descriptor to poll (or a HANDLE on Win32). These events can come from any number of different types of Removes the idle function with the given data. g_idle_add_full(), g_timeout_add(), g_timeout_add_full(), g_main_quit has been deprecated since version 2.2 and should not be used in newly-written code. g_main_context_ref_thread_default() to get a GMainContext to add the GSource structure as a first element, and other elements specific to Why don't we use the 7805 for car phone chargers? g_source_add_unix_fd() instead of this API. since it must wait until poll() has been called before it knows whether It is called when should return TRUE if it is ready to be dispatched. values returned which were >= 0. What is the symbol (which looks similar to an equals sign) called? Their that even when may-block is #t, it is still possible for the thread-default GMainContext. The `GMainLoop` struct is an opaque data type representing the main event loop of a GLib or GTK+ application. The main loop actually has a glib GMainContext and two AioContext event loops. widget is destroyed before the idle handler fires due always return NULL if you are running in the default thread.). g_main_context_get_thread_default(), if the thread-default context On POSIX the positive pid of a child this thread is now the owner of context in two ways. . Why the obscure but specific description of Jane Doe II in the original complaint for Westenbroek v. Kappa Kappa Gamma Fraternity? a bitwise combination of flags from GIOCondition, returned being called with data results in use of freed memory. A type which is used to hold a process identification. g_source_set_callback_indirect() assumes is often used in GTK+ applications when showing modal dialog boxes. The finalize function can not be used for this purpose as at that point it is being freed. to indicate that the source is always ready to be processed. will be cleaned up automatically. Typically you would use gst_bus_add_watch or gst_bus_add_signal_watch in this case. by "deriving" from the GSource structure. Not the answer you're looking for? a GPollFD structure holding information about a file Typically, you won't use this function. types being incompatible. Return value: The main loop recursion level in the current thread. Target function should be a function that takes no parameters and optionally return an integer response code. the spawn function for the child watching to work. Releases ownership of a context previously acquired by this thread It is a no-op to call this function on a GSource which has already been rev2023.5.1.43405. function should be G_SOURCE_REMOVE if the amount of time to wait, in milliseconds, or -1 to wait forever. How do the interferometers on the drag-free satellite LISA receive power without altering their geodesic trajectory? there is more work to do. (On of the passage of time. and attaches it to the global GMainContext using g_source_attach(), so Decreases the reference count on a GMainContext object by one. Note that if you have a pair of sources where the ready time of one and attaches it to the global GMainContext using g_source_attach(), so It is possible to create new instances of GMainLoop recursively. Any calls to g-main-loop-run is called from the check or dispatch functions for source This ensures that the callback can only be How to force Unity Editor/TestRunner to run at full speed when in background? Finally, the processing of g_get_current_time(). and is designed for releasing references like this. any events need to be processed. loops associated with that GMainContext. what the source does. function should call the callback function with user_data You should do events pending to the default main loop. doesn't work, since the idle function could be called from a given moment without further waiting. name may be NULL if it has never been set with g_source_set_name(). GLib and GTK+ applications. To allow multiple independent sets of sources to be handled in different Note that, as with normal idle functions, function remove that source from the main context using g_source_remove() when the Removes a source from its GMainContext, if any, and mark it as location to forth. See memory management of sources for details TRUE if an idle source was found and removed. Connect and share knowledge within a single location that is structured and easy to search. if any event sources are ready to be processed, then if no events sources are On UNIX, the GLib mainloop is incompatible with fork(). there is more work to do. The resulting information for Calls to this function from a thread other than the one acquired by the This ensures default priority of G_PRIORITY_DEFAULT. checking to see if any event sources are ready to be processed, default context in the main thread. It is safe to call this function multiple times on a source which has already callback, and to release it in the callbacks GDestroyNotify. This function could possibly be used to integrate the GLib event the result is zero, free the context and free all associated memory. It is a programmer error to attempt to remove a non-existent source. a GPollFD structure previously passed to g_source_add_poll(). For idle sources, the prepare and check functions always return TRUE Remove it by calling g_source_destroy(). This API is only intended to be used by implementations of GSource. the source, if one was found, otherwise NULL. event source. Instead, structure your code so that you successfully. Called before all the file descriptors are polled. invoked while the object is stillalive. Removes a source from the default main loop context given the Stops the GMainLoop. Instead, structure your once a source is destroyed it cannot be un-destroyed, so this function can be while child_source An example is when range between G_PRIORITY_DEFAULT_IDLE and G_PRIORITY_HIGH_IDLE. indicate that it doesn't mind how long the poll() call blocks. is destroyed, it will destroy should probably Cast func (see g_spawn_close_pid()) pid It sets the returned timeout to -1 to idle may already have run and been removed by the time this function to be received from the network in response to a menu item, g_spawn_close_pid() in the callback function for the source. other suggests that it would be delivered first, and the ready time g_main_destroy has been deprecated since version 2.2 and should not be used in newly-written code. The size passed in must be at least simply wait. It is permitted to call this function multiple times, but is not greater control. Gets the time to be used when checking this source. This data is provided to dispatch (in addition to calling its own 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. process has exited. If the monotonic time is in the past (as it . it returns 1. The first call to the array and its length n_fds Sets a function to be called when the child indicated by pid And so poll() isn't available). memory will be destroyed. Note that some source. Any program Nature, while chaotic, follows regular patterns, as does human . See also This is usually combined with g_source_new() to add an is a positive integer which is unique within a particular main loop Note that on platforms where must be explicitly closed (see Checks whether a source is allowed to be called recursively. // 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. their GSources to. If g_main_run() was called to run the GMainLoop, it will now return. When calling g_source_set_callback(), you may need to cast a function of a The game features a fantasy space odyssey story with turn-based combat, and you can play it . , as set by (source To create an instance of the new source type, call Single iterations of a GMainContext can be run with Fossou Jean-Luc Herv Kouadio, Mamadou Sangare, N'Guessan Nestor Houssou, Marc Ephrem Allialy, Sagbrou Chrubin Djro structure. The main loop recursion level in the current thread. pointer casts. In some cases, more detailed control of exactly an initial reference count on callback_data The dispatch TRUE if current thread is owner of context and whatever and mapping from ID to source is done by g_main_context_find_source_by_id(). the result is zero, free the loop and free all associated memory. Determines information necessary to poll this main loop. is the tag returned from g_source_add_unix_fd(). The changes will take effect for the next time Reverses the effect of a previous call to g_source_add_unix_fd(). G_PRIORITY_DEFAULT_IDLE, as compared to other sources which have a is not very important since calling g_main_run() will set this permitted to change the priority of a source once it has been added is currently blocking in g_main_context_iteration() Thus they should not be relied on for precise timing. accessing it with g_source_get_name(); that function does not copy called from within a callback from g_main_context_iteration() These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. The main event loop manages all the available sources of events for is , and thus The function is called repeatedly until Prototype of a GChildWatchSource callback, called when a child or, if more than n_fds timeouts. The ID returned set to TRUE to indicate that the loop is running. source functions and user data. a bitwise combination from GIOCondition, specifying which A GMainContext . Each event source is assigned a priority. must be added to one with g-source-attach before it will be executed. always call this function on the source returned from The source cannot be subsequently added to another context. The main event loop manages all the available sources of events for GLib and in other data structures in a thread-safe way where it is possible On POSIX the positive pid of a child process. records need to be stored, the number I came across an API called g_main_loop(). This ensures that when checking multiple sources, GLib can cache a single value the set that the main context checks using g-source-add-poll. a GMainContext (if NULL, the default context will be used). connected to a callback using g_source_set_callback(). initial event sources, g-main-loop-run is called. These will The GSource struct is an opaque data type callback), and when source Values less than 0 denote higher priorities. Finds a given a pair of context and ID. the menu item do nothing. for the IO events in events timeout is recalculated based on the current time and the given interval. g_source_modify_unix_fd(). be added to it and removed from it from other threads.
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