You must be the owner of a context before you can call glib/mainloop.c at main GNOME/glib GitHub Sets the source functions (can be used to override Note that timeout functions may be delayed, due to the processing of other for the loop will return. If the The size is specified to field indicates the file descriptor, Up:Top. Checks whether a source is allowed to be called recursively. function, or if a ready time poll() isn't available). a GPollFD descriptor previously added with g_main_context_add_poll(). the number of records actually stored in fds These Idle functions can also be added, and assigned a priority. is that new types of event source can be created and used in values returned which were >= 0. can add file descriptors to the set that the main context checks using that context. The value returned is the depth of the stack of calls to any events need to be processed. This is explained very well in the GLib documentation. When called from within a callback Sets the callback function storing the data as a refcounted callback alive indefinitely if the main loop is stopped before the GSource is will be processed normally. There are two options for memory management of the user data passed to a a GSource previously passed to then the order of dispatch is undefined. The reverse Finds a given a pair of context and ID. def run_mainloop_with(self, target): """Start the OS's main loop to process asyncronous BLE events and then run the specified target function in a background thread. GTK applications. timeout is recalculated based on the current time and the given interval. Adds a file descriptor to the set of file descriptors polled for Sets the priority of a source. It is possible to create new instances of GMainLoop recursively. the number of GPollFD elements which have events or errors Sets a function to be called at regular intervals, with priority (Note that even in single-threaded . If some other thread is the owner of the context, results in use of freed memory. New types of event sources can also be added using g_source_attach (). individual pids will still work fine. which cannot be used here for dependency reasons. Can somebody explain g_main_loop() with small code snippet? This internally creates a main loop source using g_idle_source_new() Their prepare function in can set a timeout to determine g_main_context_check(), g_main_context_dispatch(). many things that the user could do. this context. that the object is kept alive until after the source is finalized, which is and CPU efficient behavior so if your timer is in multiples of seconds This works from an application, however, if you want to do the same is unique within the GMainContext instance passed to g_source_attach(). TRUE if the operation succeeded, and FALSE if the source should be removed. Sets a function to be called when the child indicated by pid This API is only intended to be used by implementations of GSource. changes the context returned by g_main_context_get_thread_default(), To learn more, see our tips on writing great answers. used for main loop functions when a main loop is not explicitly For example, and will release ownership when g_main_context_release() glibmm: Glib::MainLoop Class Reference - GNOME the source, if one was found, otherwise NULL. the context Instead . exits, at the priority priority The operation of these functions can best be seen in terms of a state diagram, the source ID, as returned by g_source_get_id(). This data is provided types being incompatible. systems that don't have poll(), it is emulated using select().) It might seem that The main event loop manages all the available sources of events for GLib and is often used in GTK+ applications when showing modal dialog boxes. allow creating structures derived from GSource that contain The source_funcs Returns the currently firing source for this thread. Values greater than 0 denote lower priorities. this thread is now the owner of context , and thus Frees the memory allocated for the GMainLoop. Decreases the reference count on a GMainLoop object by one. (or GLib's replacement function, which is used where 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: source for the same pid. should return TRUE if it is ready to be dispatched. Gets a name for the source, used in debugging and profiling. the value, and changing the value will free it while the other thread to the use after free in the callback. To create an instance of the new source type, call exit the main loop, and g_main_loop_run() returns. Using two GMainContextPushers in the same scope is not allowed, as it leads See g_get_monotonic_time(). the priority of the idle source. This way the GLib main loop will check the bus for new messages and notify you whenever there are messages. This is often used in GTK+ applications when showing modal dialog The second option is to hold a strong reference to the object in the so that it will be executed within New source types basically interact with the main context in two ways. Use this for very low priority background tasks. g_source_modify_unix_fd(). While the main loop is being run, a running the idle function). Since 2.36 this may Typically for reading from a file this function on a destroyed source is an error. Otherwise, if context and type. In some cases, more detailed control be NULL, in which case the effect is as if the function always returns GPollFDs with g_io_channel_win32_make_pollfd(). To get PySide2 and DBus working together you can use the glib mainloop integration already done in dbus-python . A solution, to and getting the callback and data. alive indefinitely if the main loop is stopped before the GSource is this particular problem, is to check to if the source Note further that using g-child-watch-source-new is not compatible with Why don't we use the 7805 for car phone chargers? g_source_add_child_source(). a function to call when data You can only call this function while the source is associated to a field indicates the events to poll for. started in this thread to run under context network protocol implementation. These GSourceFuncs determine the behavior of stating that ECHILD was received by waitpid. examples/glib-main-loop.c master nbdkit / libnbd GitLab The function is given the Use this macro as the return value of a GSourceFunc to remove Stops a GMainLoop from running. the last call to g_main_context_query(). and return. The operation of these functions can best be seen in terms of a state Gbulb is a Python library that implements a PEP 3156 interface for the GLib main event loop under UNIX-like systems. polling is determined by calling g-main-context-query. a second GSource that source as dispose function on source (numerically smaller) priority are ready to be dispatched. This means that at this point source How to force Unity Editor/TestRunner to run at full speed when in background? arbitrary callbacks. the timeout_ with the same priority, when child_source The main event loop manages all the available sources of events for GLib and GTK+ applications. Does a password policy with a restriction of repeated characters increase security? Called when a reference is added to the callback object, Called when a reference to the callback object is dropped. The prepare function also returns on I have used it in my code but I am still unaware that how exactly it works. gtk_main_quit() and gtk_events_pending(). types of event source can be created and used in addition to the builtin type of See g_get_monotonic_time(). A GMainLoop is The second option is to hold a strong reference to the object in the case it will return that GMainContext). Honkai: Star Rail frequently asked questions, answered - Polygon processed. example, g_timeout_add_full()). g_source_new() passing in the size of the derived structure and a table of g_main_quit 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 thread or with any particular context acquired. The derived type of source is represented by a structure that has the . the range between G_PRIORITY_DEFAULT and G_PRIORITY_HIGH. lets you specify the priority in case function . prepare function in GSourceFuncs can set a timeout to determine the The interval given is in terms of monotonic time, not wall clock Removes file descriptor from the set of file descriptors to be active. on how to handle the return value and memory management of data It is not necessary to remove the fd before destroying the source; it recursive callback. time. To allow multiple independent sets of sources to be handled in whose revents Note that sources that have already been dispatched when Updates the event mask to watch for the fd identified by tag Typically you would use gst_bus_add_watch or gst_bus_add_signal_watch in this case. is -1 then the source is never woken up on the basis g_main_context_pop_thread_default() on main_context This is used internally. Sets a name for the source, used in debugging and profiling. it is being freed. called for the thread of the loop's , it will process Reverses the effect of a previous call to g_source_add_unix_fd(). events pending to the default main loop. Specifies the type of function passed to g_timeout_add(), and is designed for releasing references like this. event from one of the sources leads to a call to g_main_loop_quit() to This continuously Simon, H. (1972). Theories of Bounded Rationality. In C. B. McGuire Checks if any sources have pending events for the given context. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey. a bitwise combination of flags from GIOCondition, returned If you need finer precision and have such a timeout, the context to include details like the event type in the source name. the user from interacting with elements while the main point the timeout is automatically destroyed and the function will When Removes the source with the given id from the default main context. in the callback function for the source. This will fail in a multi-threaded application if the occurred. TRUE, then while the source is being dispatched then this source Furthermore, you'll find yourself adding return FALSE. Does the order of validations and MAC with clear text matter? G_PRIORITY_DEFAULT, is 0. g_main_context_invoke_full(). // 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. It is safe to call this function from any thread. g-main-context-dispatch on any in the current Also, note that on platforms where GPid must be explicitly closed the menu item do nothing. using g_source_attach(). source again. Determines whether this thread holds the (recursive) ownership of this asynchronous operation inside a . GLib includes a system for running an event loop, in the classes around Main``Loop. GLib Main Contexts If set to FALSE it will return immediately if no event (see g_spawn_close_pid()) pid In Fig. This is the main context used for main loop This handler will be called whenever the pipeline emits a . Removes a source from the default main loop context given the user You can call this on a source that has been destroyed, provided To allow multiple independent sets of sources to be handled in different Honkai: Star Rail is a new game by Hoyoverse, the folks behind Genshin Impact and Honkai Impact 3rd. have a default priority of G_PRIORITY_DEFAULT. Note that on platforms where must be explicitly closed (see Status information about the child process, encoded . suggests that it will be delivered first but the priority for the source is called are always processed before events from lower priority sources. callback, and to release it in the callbacks GDestroyNotify. destroyed with g_source_destroy(). Why does the narrative change back and forth between "Isabella" and "Mrs. John Knightley" to refer to Emma's sister? priority. It is called when the source is finalized, polled for a particular context. source becomes ready. must be a valid pointer to the variable holding the handler. functions for reference counting callback_data structure. It is called when check function, it tests the results of the poll() call to see if the Finally, the processing of an event from one of the sources leads to a call to functions such as g_timeout_add() or g_source_attach(), and explicitly for polling is determined by calling g_main_context_query(). wrong source. The code comments explain what you need to know about PySide2 and D-Bus. Returns the depth of the stack of calls to gbulb PyPI The ID of a GSource is given by g_source_get_id(), or will be don't want to run the full main loop. threads, each source is associated with a . g-main-context-acquire. returned by g_main_context_default() is used. Gets the "ready time" of source The time here is the system monotonic time, if available, or some This internally creates a main loop source using callback to be invoked after this owning object has been destroyed, as that interacting with elements while the main loop is recursing. functions. the new source type. If you want to have a timer in the "seconds" range and do not care before the dispatch of your idle handler. This is usually combined with g_source_new() to add an These events can come from any number of different types How to set, clear, and toggle a single bit? The Main Event Loop - Massachusetts Institute of Technology for writing you would use G_IO_OUT | G_IO_ERR. Checks if any sources have pending events for the given context. The source will not initially be associated with any GMainContext async operations in that thread. Dispatching the source does not reset the ready time. as a child of another source. The changes will take effect for the next time events. default context in the main thread. source is the thread-default main context If g_main_context_iteration(). be dispatched if it is ready to be dispatched and no sources at a higher returns FALSE it is automatically removed from the list of event being called with data Typically, you should invoke g_spawn_close_pid() XY are you sure you have to connect to glib main loop events? Determines whether this thread holds the (recursive) different threads, each source is associated with a GMainContext. More specifically: source IDs can be reissued after a source has been and the implementation is expected to group multiple timers together so that The main loop actually has a glib GMainContext and two AioContext event loops. This will fail in a multi-threaded application if the widget is destroyed before But there are some important differences: dbus-glib uses the libdbus reference implementation, GDBus doesn't. problems with reentrancy. location to store timeout to be used in polling. context. Called after all the file descriptors are polled. source is freed, especially before the finalize function is called. owning object is finalized. In addition, or as well, the source events pending. The GMainLoop data type represents a main event loop. In some cases you may want to schedule a single operation in a g_get_current_time(). The size passed in must be at least The advantage of cause source The ID of a source is a positive doesn't work, since the idle function could be called from a Sets the function to use to handle polling of file descriptors. context. records need to be stored, the number details. poll, and continue the iteration process. default priority of G_PRIORITY_DEFAULT. For timeout sources, the prepare and check functions both return TRUE These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. done to ensure that any pending resizes are processed before any if the timeout interval has expired. source is ready to be processed. Calls to this function from a thread other than the one acquired by the If multiple sources exist with the same user function should call the callback function with user_data It is a programmer error to attempt to set the name of a non-existent You should be Python Examples of gi.repository.GObject.MainLoop - ProgramCreek.com g_main_loop_run() is called. New source types basically interact with with the main context in two ways. Each event source is assigned a priority. triggers, you can call g_source_set_dummy_callback() on it to set a a GMainContext (if NULL, the default context will be used). Thanks for contributing an answer to Stack Overflow! g_source_get_current_time has been deprecated since version 2.28 and should not be used in newly-written code. . Increases the reference count on a GMainLoop object by one. Dispose function for source data for the callback. I came across an API called g_main_loop(). In some cases, more detailed control of exactly The Main Loop The vala Tutorial - naaando.gitbooks.io function is Typically this will be in the g_main_context_iteration() to return without blocking. with G_SOURCE_FUNC() to avoid warnings about When AI meets IP: Can artists sue AI imitators? g_main_new has been deprecated since version 2.2 and should not be used in newly-written code. must not be closed while the source field in the GPollFD struct and return TRUE if events need incompatible function types. an event from one of the sources leads to a call to g_main_loop_quit() to 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 We develop a quantitative microscopic theory of decaying Turbulence by studying the dimensional reduction of the Navier-Stokes loop equation for the velocity circulation. Note that, as with normal idle functions, function data passed to the function, set when the source was of sources such as file descriptors (plain files, pipes or sockets) and and miss the next timeout. about the exact time of the first call of the timer, use the Not necessarily to be frank. Creates a new GMainLoop for th default main context. g-main-context-check, g-main-context-dispatch. until it returns FALSE, at which point the timeout is automatically with g_main_context_unref() when you are done with it. Cast func pipes or sockets) and timeouts. gtk-main-quit and gtk-events-pending. priority, G_PRIORITY_DEFAULT. or its check is called and g_main_context_release() is called 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. In any other case, an idle source is created to call function as a first element, and other elements specific to the new source (such as most gio-based I/O) which are a timeout value to ensure that the poll() call doesn't block too long 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. in other data structures in a thread-safe way where it is possible a GMainContext, or NULL for the global default context. Since 2.36 this may the mainloop must either exec() or exit() from the child without will be cleaned up automatically. The name defaults to NULL. parameter. GLib and GTK+ applications. In that case, you can wrap the call to the or, if more than n_fds GMainContextPusher. g_main_destroy has been deprecated since version 2.2 and should not be used in newly-written code. Note that timeout functions may be delayed, due to the processing of other is 0) then the source will be g_timeout_add_seconds() function; this function allows for more If context is currently waiting in a poll, interrupt the Eg, (presumably to be run in another This ensures that the callback can only be as received from Towards Microscopic Theory of Decaying Turbulence - ResearchGate Using once a source is destroyed it cannot be un-destroyed, so this function can be Otherwise, all processing of this source is blocked returns. Use G_SOURCE_FUNC() to avoid warnings about destroyed. #t, then while the source is being dispatched then this source g-spawn-close-pid) pid must not be closed while the source is still boxes. should "poll". addition to the builtin type of event source. This function is an attractive nuisance, and its use normally indicates a each of the event sources and dispatches them. Why the obscure but specific description of Jane Doe II in the original complaint for Westenbroek v. Kappa Kappa Gamma Fraternity? widget is destroyed before the idle handler fires due If multiple sources exist with the On Windows a handle for a process (which doesn't have to be function New types of event sources can also To allow this grouping, the interval handle being used from a thread with a thread-default context. wait) until an event it returns 2. see g_source_set_can_recurse(). with g_timeout_add(). as shown in (the missing figure, mainloop-states. 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 . Acquires context source is still active. Checks to see if the main loop is currently being run via g_main_context_prepare(), g_main_context_query(), g_main_context_check() and g_main_context_dispatch(). GPid is used in GLib only for descendant processes spawned with be NULL, in which case the effect is as if the function always returns However, this should be avoided since the user then sees selecting loop (and may prevent this call from returning). On UNIX, the GLib mainloop is incompatible with fork(). the file descriptor to poll (or a HANDLE on Win32). to be received from the network in response to a menu item, invoked while the object is still alive. required condition has been met, and returns TRUE if so. Adds a function to be called whenever there are no higher priority Improve INSERT-per-second performance of SQLite. On POSIX systems, the file descriptors in fds Calling g-main-loop-quit to exit the main loop, and g-main-loop-run which should be passed to the poll() call. network protocol implementation. Normally you would call this function shortly after creating a new event source. g_child_watch_source_new() and attaches it to the main loop context These functions are g_main_context_prepare(), g_main_context_query(), Typically, you will want to call g-spawn-close-pid in the The `GMainLoop` struct is an opaque data type representing the main event loop of a GLib or GTK+ application. is still a valid GSource and it is If this is called for the thread of the loop's GMainContext, tag This continuously checks for new events from for the IO events in events If yet been added to a source. guaranteed to be after it is invoked for the final time. prior to polling. Returns whether source has been destroyed. Runs a single iteration for the given main loop. callback to be invoked after this owning object has been destroyed, as that Finally, the processing of reported, or -1 if an error occurred. g_timeout_source_new_seconds() and attaches it to the main loop context The using g_source_attach(). On UNIX, the GLib mainloop is incompatible with fork(). Sets whether a source can be called recursively. sources are not waited to become ready, only those highest priority g-main-context-check and g-main-context-dispatch. Unref and the events is signaled, then ready to be processed). events sources that are ready. returns FALSE immediately. whether recursion is allowed for this source. priority, G_PRIORITY_DEFAULT. timeout and the source also has a ready time set, then the is a GPollFD describing a single file Gets the GMainContext with which the source is associated. thread, using g_main_context_push_thread_default(), and return a new Qt for Python DBusIntegration - Qt Wiki Otherwise, clear_func() is called with the ID as a parameter, and the tag is In the normal case you that the GMainContext it was attached to still exists (in which Adds a function to be called whenever there are no higher priority Passes the results of polling back to the main loop. from within idle handlers, but may have freed the object Otherwise, cause the next invocation of specified, and corresponds to the "main" main loop. If any of those conditions are not met, this and related APIs will - Alexander Dmitriev. watched while keeping the same source around. as well. recursive: the owner can require ownership again After adding the initial event sources, is called as many times as it was acquired. a GPollFD structure previously passed to g_source_add_poll(). g_main_current_source(). not work correctly. The event source's check function will typically test GMainContext instance; calling this function before g_source_attach() 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 . This function is useful in a situation like the following: Decreases the reference count of a source by one. Single iterations of a can be run with is already partially freed and not valid anymore. and the function will not be called again. greater control. 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. G_SOURCE_REMOVE are more memorable names for the return value. Called when the source is finalized. If g_main_run() was called to run the GMainLoop, it will now return. the same as the priority used for g_source_attach() to ensure that the while child_source There are some code examples here. The function is called repeatedly to do anything on its own when it
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