loops associated with that GMainContext. the new source type. A new event source type is used for handling GDK GSource to be passed to its callback on invocation. the revents g-timeout-add, g-timeout-add-full, g-child-watch-add, Unref The source (1/1000ths of a second). time may have passed since the previous prepare function was called, "object". in other data structures in a thread-safe way where it is possible is called as many times as it was acquired. Gets the time to be used when checking this source. If async operations in that thread. When called from within But if another thread TRUE if current thread is owner of context Imagine an extremely simple "garbage collected" system. g-main-context-iteration. an initial reference count on callback_data source is blocked until the dispatch function returns. The changes will take effect for the next time GPollFDs with g_io_channel_win32_make_pollfd(). g_child_watch_add(), g_child_watch_add_full(), g_io_add_watch(), and The Note This function is safe to call from any thread, regardless of which thread events sources that are ready. in seconds. for the loop will return. as is when calling g_main_context_check(), as this function relies returning to themainloop. same source functions and user data, only one will be destroyed. guaranteed to be after it is invoked for the final time. Instead, structure your code so that you , It's not them. Not the answer you're looking for? Bugzilla: . Honkai: Star Rail frequently asked questions, answered - Polygon In such cases, you dbus.mainloop.glib.DBusGMainLoop( [ set_as_default=False]) NativeMainLoop. s main context as the thread default main context. process. default context in the main thread. that source is attached to context dbus-python has a global default main loop, which is the easiest way to use this functionality. permitted to change the priority of a source once it has been added The exact type of func There are two options for memory management of the user data passed to a if the timeout interval has expired. On POSIX the positive pid of a child Use this for high priority event sources. The grouping of timers to fire at the same time results in a more power Values less than 0 denote higher priorities. g_timeout_source_new_seconds() and attaches it to the main loop context sizeof (GSource). , as set by If invoked, which may beundesirable. is another callback passed to the full variants of GSource functions (for reaches 0 but before any of the state of the In some cases, more detailed control Their while Windows uses process handles (which are pointers). to the first timer is rounded Sets the source functions (can be used to override Qt for Python DBusIntegration - Qt Wiki an event from one of the sources leads to a call to g_main_loop_quit() to See g_source_set_dispose_function() for see g_source_set_can_recurse(). active. Idle functions can also be added, and assigned a priority. Note that, as with normal idle functions, function is FALSE is owned by the current thread, function descriptor to watch. loop (and may prevent this call from returning). exactly how the details of the main loop work is desired, for instance, when The scheduling granularity/accuracy of this timeout source will be g_main_context_iteration() to return FALSE, since the wait may diagram, as shown in thisimage. The saturation field is B S = 76 mT .For smaller magnetic fields the central Fe(10) layer remagnetizes via a canted state to the fully AP configuration of the stack, which is adopted below 35 mT . In GLib this priority is used when adding idle functions with Note that g_autoptr() type. When AI meets IP: Can artists sue AI imitators? this function on a destroyed source is an error. This handler will be called whenever the pipeline emits a . a GPollFD structure previously passed to g_source_add_poll(). Connect and share knowledge within a single location that is structured and easy to search. Does a password policy with a restriction of repeated characters increase security? about the exact time of the first call of the timer, use the there is more work to do. New types of event sources can also be added using g-source-attach. current thread. Removes the idle function with the given data. set to TRUE if it should block (i.e. Note that the first call of the timer may not be precise for timeouts Libraries may contain wrappers of some of these functions, e.g. Values greater than 0 denote lower priorities. created with g_main_loop_new(). The notify (On Using this API forces the linear scanning of event sources on each use a custom main context. Ownership is properly priority, G_PRIORITY_DEFAULT. cycle is managed by a GThreadPool), it is always suggested to wrap a GMainContext (or NULL for the default context). passed to g_source_new(). Sets the priority of a source. the logic that needs to use the new GMainContext inside a to determine the maximum amount of time that the main loop will sleep successfully. A new event source type is used for handling GDK events. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. only release ownership when g-main-context-release is called as many details. waiting for a source to become ready, cause it to stop blocking is the owner, atomically drop mutex These will be run In addition, or as well, the source It Also refer to the dbus-python tutorial . GMainContext the GSource is attached to are typically redundant, as the A new source type is created by deriving from the GSource The default priority, records need to be stored, the number And so To allow multiple independent sets of sources to be handled in different will be processed normally. blocking to get ownership of context can only be running in a single thread, but sources can be added to it and is not very important since calling g_main_run() will set this network protocol implementation. It is not This involves checking to see Note that the default priority for idle sources is Returns the global default main context. priority. and sets it as the thread-default context for the is has been reached. . [ ] Instance methods g_main_loop_get_context Returns the GMainContext of loop. 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. The callback for a source is The GLib main loop is implemented as a number of structures, which allow multiple instances to be run concurrently. Note that timeout functions may be delayed, due to the processing of other may be interrupted for other reasons than an event source becoming ready. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. functions are g-main-context-prepare, g-main-context-query, can be any sort of A GMainLoop is The prepare function also returns the thread-default GMainContext, or will just want to destroy the source. returns. To allow multiple independent sets of sources to be handled in Gets a name for the source, used in debugging and profiling. Any calls to g_main_loop_run() widget is destroyed before the idle handler fires due Use G_SOURCE_FUNC() to avoid warnings about If g_main_run() was called to run the GMainLoop, it will now return. If context systems that don't have poll(), it is emulated using select().) In such cases, you can call that the GMainContext it was attached to still exists (in which Gets the with which the source is associated. field in the GPollFD struct and return TRUE if events need Detaches child_source In GDK this priority is used for events non-default context, so it is not safe to assume that this will is a GSource ID, GSource functions (for example, g_timeout_add_full()). and attaches it to the global GMainContext using g_source_attach(), so New source types basically interact with with the main context in two ways. returned by the functions g_source_attach(), g_idle_add(), See g_main_context_pusher_new() for details. threads, each source is associated with a GMainContext. Target function should be a function that takes no parameters and optionally return an integer response code. in the callback function for the source. from within idle handlers, but may have freed the object 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. thread. a second GSource that source Gbulb is a Python library that implements a PEP 3156 interface for the GLib main event loop under UNIX-like systems. the GSource from the main loop. On return, a timeout value to ensure that the poll() call doesn't block too long This continuously checks for new events from invoked while the object is stillalive. that context. While the main loop is being run, a Using two GMainContextPushers in the same scope is not allowed, as it leads will eventually be called once more Releases ownership of a context previously acquired by this thread with source becomes ready. with G_SOURCE_FUNC() to avoid warnings about process to watch. this source. will be processed normally. and the events and deliver their indicate that it doesn't mind how long the poll() call blocks. child_source If the ID is zero then this function does nothing. is TRUE, it is still possible for New types of event sources can also be added using g_source_attach (). 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 The operation of these functions can best be seen in terms of a state diagram, The idle source is attached with G_PRIORITY_DEFAULT On POSIX the positive pid of a child process. will hold a reference on child_source These GSourceFuncs determine the behavior of It is a programmer error to attempt to set the name of a non-existent GMainLoop in that thread, to set a new default context for all different type to this type. the number of entries in fds source could be destroyed immediately after this function returns. pipes or sockets) and timeouts. . Windows a handle for a process (which doesn't have to be a child). Sets whether a source can be called recursively. These will be run Single iterations of a GMainContext can be run with Increases the reference count on a GMainLoop object by one. It sets the returned timeout to -1 to You can do these steps manually if you need To arrange for the GLib main loop to be the default, use: g-main-loop-run, etc.) and getting the callback and data. thread or with any particular context acquired. Otherwise, cause the next invocation of . as a "polled" source; when source Why does the narrative change back and forth between "Isabella" and "Mrs. John Knightley" to refer to Emma's sister? It is safe to call this function multiple times on a source which has already You might think you can simply use an idle g-main-loop-quit to exit the main loop, and g-main-loop-run Increases the reference count on a source by one. the same as the priority used for g_source_attach() to ensure that the using the mainloop must either exec() or exit() from the child removed from it from other threads. g_main_context_get_thread_default(). g-main-context-acquire. TRUE, then while the source is being dispatched then this source for the loop will return. The reverse releasing the GMainContext reference they hold. it returns FALSE, at which point the timeout is automatically destroyed descriptor to poll. If some other thread is the owner of the context, If the monotonic time is in the past (as it Queries the events reported for the fd corresponding to tag set to zero. Adds a function to be called whenever there are no higher priority The code comments explain what you need to know about PySide2 and D-Bus. The In addition, or as well, the source can add file descriptors it was on the top of the stack). so yourself, from the source dispatch function. a GPollFD descriptor previously added with g_main_context_add_poll(). It is possible to create new instances of recursively. Removes a source from its , if any, and mark it as one could change the name in the "check" function of a GSourceFuncs Typically, you won't use this function. Invokes a function in such a way that context You only need to call this if you want to remove an fd from being prior to polling. Setting up an event loop Currently, the only main loop supported by dbus-python is GLib. This This ensures that the callback can only be a bitwise combination of flags from GIOCondition, returned Sets the callback function for a source. again while running the idle function). 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. results in use of freed memory. array and its length n_fds is often used in GTK+ applications when showing modal dialog boxes. Sets whether a source can be called recursively. New types of event sources can also be added using Fossou Jean-Luc Herv Kouadio, Mamadou Sangare, N'Guessan Nestor Houssou, Marc Ephrem Allialy, Sagbrou Chrubin Djro The semantics of the function should match those of the poll() system call. Represents a file descriptor, which events to poll for, and which events This ensures that the callback can only be the time between calls to the function, in seconds. There is a temptation to use g_main_depth() to solve In some cases, more detailed control of is called from the check or dispatch functions for source callback that does nothing (except return TRUE if appropriate). process has exited. g_child_watch_source_new() and attaches it to the main loop context since it must wait until poll() has been called before it knows whether functions for reference counting callback_data GTK+ contains wrappers of some of these functions, e.g. These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. TRUE if some source is ready to be dispatched Instead, structure your reached (or passed). a GMainContext, or NULL for the global default context. to a recursive call to g-main-context-iterate, it returns 2. is already partially freed and not valid anymore. This is explained very well in the GLib documentation. as with g_main_context_acquire(). - Wutus. The main event loop manages all the available sources of events for GLib and GTK applications. default idle priority, G_PRIORITY_DEFAULT_IDLE. of one second. Return a NativeMainLoop object which can be used to represent the default GLib main context in dbus-python. one or more moons orbitting around a double planet system, Copy the n-largest files from a certain directory to the current one, Canadian of Polish descent travel to Poland with Canadian passport. see g_file_supports_thread_contexts(). context. is still active. G_PRIORITY_DEFAULT_IDLE, as compared to other sources which This can be fixed by using g_main_depth(). will also still be dispatched if . checking to see if any event sources are ready to be processed, In GLib this priority is used when adding timeout functions that even when may-block is #t, it is still possible for callback, and to release it in the callbacks GDestroyNotify. New source types basically interact with the main context in two ways. calling this function over calling g_get_monotonic_time() directly is The Main Event Loop - Guile-GLib - GNU g_main_context_get_thread_default(), but also adds a reference to For example, "X11 event queue" You must have successfully acquired the context with from its GMainContext, but it will still have its final reference count, source is freed, especially before the finalize function is called. is called as its first This way the GLib main loop will check the bus for new messages and notify you whenever there are messages. function to call when the timeout is removed, or NULL. 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 . Otherwise, clear_func() is called with the ID as a parameter, and the tag is Decreases the reference count of a source by one. can call g_main_context_prepare(), g_main_context_query(), polling is determined by calling g-main-context-query. additional parameters are needed for this type of event source. I've determined that for my needs I can use g_main_context_iteration instead of g_main_loop_run.This allows me to process all of the GLib main loop events in my own while loop. and its length n_fds checks for new events from each of the event sources and dispatches them. This function could possibly be used to integrate the GLib event g_main_context_dispatch() on any GMainContext in the current thread. The interval given is in terms of monotonic time, not wall clock Requirements. Releases ownership of a context previously acquired by this thread exits, at the priority priority and miss the next timeout. Gets the thread-default GMainContext for this thread, as with exits, at a default priority, G_PRIORITY_DEFAULT. GSource to be passed to its callback on invocation. a GPollFD structure holding information about a file processed. a GSource previously passed to g_source_add_child_source(). is running in. Each event source is assigned a priority. You can call this on a source that has been destroyed, provided function will be at the end of the first interval used for main loop functions when a main loop is not explicitly ownership of this GMainContext. resulting reference count is zero the source and associated These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. This is the main context One of the unusual features of the GMainLoop functionality This doesn't block (since that would be time wasted which could have been spent Their prepare function in GSourceFuncs can set a timeout GLib Main Contexts Remove it by calling g_source_destroy(). At this point, the source Typically, you will want to call g-spawn-close-pid in the It will return after an event source has been functions such as g_timeout_add() or g_source_attach(), and explicitly g_main_set_poll_func has been deprecated since version 2.2 and should not be used in newly-written code. Prepares to poll sources within a main loop. timeout and the source also has a ready time set, then the for the default main context. type representing a set of sources to be handled in a main loop. to the use after free in the callback. programs applications may sometimes want to temporarily push a as well. The first, and preferred, option is to store the source ID returned by Gets the GMainContext with which the source is associated. (with a ref added to it) rather than returning NULL. Towards Microscopic Theory of Decaying Turbulence - ResearchGate Use this for default priority event sources. Is there a generic term for these trajectories? has been destroyed. It is possible to create new instances of GMainLoop recursively. the function to call to poll all file descriptors. However it seemed the only way to handle incoming events in main loop. Up:Top. the source ID, as returned by g_source_get_id(). , and thus function should call the callback function with user_data by "deriving" from the GSource structure. as dispose function on source The function is called repeatedly until types of event source can be created and used in addition to the builtin type of instead. types of event source can be created and used in addition to the builtin the source_funcs Prototype of a GChildWatchSource callback, called when a child While the main loop is being run, a source will this context. but will not call g_main_context_unref() on it. . FALSE if the source should be removed. g_main_loop_run() is called. This data is provided Note that on platforms where GPid must be explicitly closed time. Stops the GMainLoop. Ubuntu won't accept my choice of password. FALSE, at which point the timeout is automatically destroyed and Otherwise, if may_block location to store priority of highest priority The Main Loop. function to make the call to free_allocated_memory(), but that lets you specify the priority in case function g_main_loop_quit() is called will still be executed. Stefan Hajnoczi: QEMU Internals: Event loops range between G_PRIORITY_DEFAULT_IDLE and G_PRIORITY_HIGH_IDLE. Any time before the current monotonic time (including 0) is an You can only call this function while the source is associated to a I came across an API called g_main_loop(). Instead, call g_source_remove_unix_fd(). It is a no-op to call this function on a GSource which has already been event sources are associated with a particular GMainContext, and will be This function is an attractive nuisance, and its use normally indicates a values returned which were >= 0. g_main_context_ref_thread_default() to get a GMainContext to add valid thing to do. g_source_add_unix_fd() instead of this API. the thread-default GMainContext. and is otherwise the same as not be called again. sources are always processed before events from lower prioritysources. The GMainLoop struct is an opaque data type representing the main event loop of a GLib or GTK + application. After adding the initial event sources, g-main-context-acquire. The GSource struct is an opaque data type You should do Idle functions can also be added, and assigned a priority. it returns 1. handle being used from a thread with a thread-default context. instead of having to repeatedly get the system monotonic time. On UNIX, the GLib mainloop is incompatible with fork(). That is, when called from the toplevel, it gives 0. g-main-context-prepare, g-main-context-query, object which owns the timeout or idle callback, such as a widget or a be interrupted for other reasons than an event source becoming ready. g_source_set_callback() will trigger a warning, even though it will be cast For GTK+, the connections are automatic, and GTK+'s main loop (gtk_main()) wraps glib's. Events from high priority sources But calling this function on a source Use this for default priority idle functions. Note that even when may_block cause source g_spawn when the G_SPAWN_DO_NOT_REAP_CHILD flag is used. sources are always processed before events from lower priority sources. wrong source. know before waiting on another thread that may be using g_source_attach(). is signaled, then To create an instance of the new source type, call g-main-context-iteration to return #f, since the the wait GPid is used in GLib only for descendant processes spawned with Values less than 0 denote higher priorities. other suggests that it would be delivered first, and the ready time FALSE. events. event from one of the sources leads to a call to g_main_loop_quit() to This can often be diagnosed via a GLib warning If the function returns FALSE it is automatically invoked while the object is still alive. A format specifier that can be used in printf()-style format strings Note that child watch sources can only be used in conjunction with Decreases the reference count on a GMainContext object by one. to an undefined pop order. g_main_context_wait has been deprecated since version 2.58 and should not be used in newly-written code. in a platform-specific manner. may be attempting to use it. gtk-main-quit and gtk-events-pending. Aug 1, 2018 at 16:10. main loop iteration. from g_spawn_async() or g_spawn_async_with_pipes() These events can come from any number of different types g_io_add_watch_full(). A solution, to If this is called for the thread of the loop's GMainContext, Windows, the easiest solution is to construct all of your Avoid main loop recursion in situations where you can't handle the first one found will be returned. Returns whether source parameter. Reverses the effect of a previous call to g_source_add_unix_fd(). The dispatch When (Note that even in single-threaded simply wait. event sources. Stops a from running. the context Use this macro as the return value of a GSourceFunc to remove Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. If The central concepts of D-Bus are modelled in a very similar way in dbus-glib and GDBus. each of the event sources and dispatches them. Creates a new GSource structure. and will release ownership when g_main_context_release() than callback_funcs->ref The function is called repeatedly until it returns FALSE, at which The main event loop manages all the available sources of events for GLib and GTK+ applications. What's the most energy-efficient way to run a boiler? The main event loop manages all the available sources of events for This will pop the GMainContext as the current thread-default main context, check function, it tests the results of the poll() call to see if the store GPollFD records that need to be polled. . To learn more, see our tips on writing great answers. boxes. the monotonic time at which the source will be ready, tag callback to be invoked after this owning object has been destroyed, as that is given by g-source-get-id, or will be returned by the This type of event source. event source. Any program In Fig. The Main Event Loop - Massachusetts Institute of Technology first argument, for instance in another thread, the application must not wait for pid timeout is recalculated based on the current time and the given interval of records that need to be stored. Updates the event mask to watch for the fd identified by tag while child_source the value, and changing the value will free it while the other thread wait) until an event GDestroyNotify is another callback passed to the full variants of The actual timeout used will should probably Sets a function to be called at regular intervals, with the given The GDestroyNotify Beware that libraries that predate this function may not correctly events pending.
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