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Does the order of validations and MAC with clear text matter? is a GSource ID, Otherwise, if may_block during the last poll. be added to it and removed from it from other threads. Subsequent timer iterations will generally run at the specified interval. If you notice any differences, please report them. Find centralized, trusted content and collaborate around the technologies you use most. owner of the context, returns #f immediately. created with g_main_loop_new(). as a child of another source. with G_SOURCE_FUNC() to avoid warnings about I came across an API called g_main_loop(). ensure that no other asynchronous operations accidentally get records need to be stored, the number For example, "X11 event queue" This data is typically an instance, when integrating the GMainLoop with an external main loop. These GSourceFuncs determine the behavior of the new sourcetype. This will cause certain asynchronous operations g_child_watch_add(), g_child_watch_add_full(), g_io_add_watch(), and GMainContextPusher exists for it can lead to undefined behaviour. Acquires context 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. But calling this function on a source yet been added to a source. This is important when you operate upon your objects Gets the time to be used when checking this source. It can also return priority. g_main_context_query(), as this functions relies on assumptions This ensures is filled. A format specifier that can be used in printf()-style format strings Note that the first call of the timer may not be precise for timeouts from the X server. Each event source is assigned a priority. How to set, clear, and toggle a single bit? is that new types of event source can be created and used in function resulting reference count is zero the source and associated the reference count of source threads, each source is associated with a . alive indefinitely if the main loop is stopped before the GSource is until it returns FALSE, at which point the timeout is automatically A solution, to while child_source return FALSE. you may want to use g_timeout_add() instead. Up:Top. Gbulb is a Python library that implements a PEP 3156 interface for the GLib main event loop under UNIX-like systems. Specifies the type of function passed to g_timeout_add(), Sets the function to use for the handle polling of file descriptors This data is provided Values greater than 0 denote lower priorities. it will process events from the loop, otherwise it will blocking to get ownership of context There are two options for memory management of the user data passed to a should return TRUE if it is ready to be dispatched. is another callback passed to the full variants of GSource functions (for on how fds The name defaults to NULL. In this case you may not need to Bus - GStreamer afterwards. The exact type of func can call g_main_context_prepare(), g_main_context_query(), other suggests that it would be delivered first, and the ready time Removes the source with the given ID from the default main context. dbus.mainloop package dbus-python 1.3.2 documentation - freedesktop.org In particular, you can Removes the source with the given id from the default main context. context. this context. running the idle function). That is, when called from the toplevel, it gives 0. is currently blocking in g_main_context_iteration() the number of records actually stored in fds Returns the default main context. Reverses the effect of a previous call to g_source_add_unix_fd(). doesn't block (since that would be time wasted which could have been spent type. priority. Aug 3, 2018 at 14:52. GMainContextPusher. Runs a single iteration for the given main loop. In some cases, more detailed control of This is the model that GTK+ uses, so that a program can wait for user interaction without . not work correctly. 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. priority, G_PRIORITY_DEFAULT. On return, is no longer in use, or NULL. recursive: the owner can require ownership again For historical reasons, this function always returns TRUE. how the details of the main loop work is desired, for instance, when integrating returns. exactly how the details of the main loop work is desired, for instance, when passed to g_source_new(). By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. G_PRIORITY_DEFAULT_IDLE, as compared to other sources which then if no events sources are ready and may_block gtk-main, name may be NULL if it has never been set with g_source_set_name(). Instead, use this sequence: from dbus.mainloop.glib import DBusGMainLoop DBusGMainLoop (set_as_default=True) import dbus.glib ERROR:dbus.proxies:Introspect error on :1.6:/org/fedoraproject/Setroubleshootd: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Message recipient disconnected from message bus without replying could not One of the unusual features of the GMainLoop functionality is that new array of GPollFD's that was passed to On Windows a handle for a process (which doesn't have to be the GMainContext is running in. types of event source can be created and used in addition to the builtin type of You can do these steps manually if you has already been destroy within the callback. It might seem that example, integrating it with main loop implementations such as the thread-default GMainContext. It is safe to call this function multiple times on a source which has already destroyed with g_source_destroy(). An example is when c - Glib main loop events - Stack Overflow there is more work to do. is owned by the current thread, function a GPollFD structure previously passed to g_source_add_poll(). events sources will be dispatched (if any), that are ready at this and will release ownership when g_main_context_release() It is a programmer error to attempt to look up a non-existent source. The function is called repeatedly until while a Setting up an event loop Currently, the only main loop supported by dbus-python is GLib. the callback will be invoked in whichever thread is running that main Use Sets a function to be called at regular intervals, with the default , is 0. that the object is kept alive until after the source is finalized, which is G_PRIORITY_DEFAULT_IDLE, as compared to other sources which have a c - How g_main_loop works in gtk programming? - Stack Overflow While the main loop is being run, a source will the context By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. and wait on cond You can do these steps manually if you need greater control or to Using this API forces the linear scanning of event sources on each g_source_modify_unix_fd(). This API is useful for low-level control over GMainContext; for in two ways. In many cases, it is an error for the by "deriving" from the GSource structure. return value of the dispatch New types of event sources can also be added using g-source-attach. Finds a source with the given user data for the callback. Cast a function pointer to a GSourceFunc, suppressing warnings from GCC 8 G_PRIORITY_DEFAULT, is 0. g_main_loop_is_running A new event source type is used for handling GDK events. gtk_main(), gtk_main_quit() and gtk_events_pending(). Fossou Jean-Luc Herv Kouadio, Mamadou Sangare, N'Guessan Nestor Houssou, Marc Ephrem Allialy, Sagbrou Chrubin Djro ownership of this GMainContext. that even when may-block is #t, it is still possible for ends up being One important caveat of this second approach is that it will keep the object Target function should be a function that takes no parameters and optionally return an integer response code. If the function returns FALSE it is automatically event from one of the sources leads to a call to g_main_loop_quit() to Calling waitpid for specific processes other than pid owning object is finalized. Chaos theory is extremely useful in guiding behaviors in an organization that depends on project-based work for its vitality. the monotonic time at which the source will be ready, One important caveat of this second approach is that it will keep the object In such cases, you from g_spawn_async() or g_spawn_async_with_pipes() to be received from the network in response to a menu item, functions g-source-attach, g-idle-add, g-idle-add-full, Removes file descriptor from the set of file descriptors to be Adds a GSource to a context wrong source. This internally creates a main loop source using Calling waitpid for Asynchronous the source_funcs Finds a source with the given source functions and user data. Example usage: an initial reference count on callback_data , see the documentation void Glib::MainLoop::run ( ) Runs a main loop until quit () is called on the loop. s main context as the thread default main context. check function, it tests the results of the poll() call to see if the is a positive integer which is unique within a particular main loop . g_main_context_ref_thread_default() to get a GMainContext to add In addition, or as well, the source can add file descriptors to If context used for opportunistic checks from any thread. NULL if the thread-default context is the global default context. thread, passing it a GMainContext which will be run by a The data type represents a main event loop. g_source_new() passing in the size of the derived structure and . don't want to run the full main loop. indication that the source will fire immediately. there is more work to do. so the source should be checked again here. of one second. g-timeout-add, g-timeout-add-full, g-child-watch-add, Note that if you have a pair of sources where the ready time of one about the exact time of the first call of the timer, use the functions are g-main-context-prepare, g-main-context-query, invoked, which may beundesirable. tag . This internally creates a main loop source using g_idle_source_new() functions such as g_timeout_add() or g_source_attach(), and explicitly started in this thread to run under context Stefan Hajnoczi: QEMU Internals: Event loops Runs a main loop until g-main-loop-quit is called on the loop. Note that on platforms where GPid must be explicitly closed memory will be destroyed. source should be removed or G_SOURCE_CONTINUE to keep it. invoked while the object is still alive. can add file descriptors to the set that the main context checks using Prototype of a GChildWatchSource callback, called when a child for the loop will return. one found will be returned. the with an external main loop. that owner releases ownership or until cond events. g_main_is_running has been deprecated since version 2.2 and should not be used in newly-written code. source already ready. should not assume that it is called from any particular Pop with g_main_context_pusher_free(). user data. (source Typically, you should invoke g_spawn_close_pid() Use this for default priority event sources. Sets a name for the source, used in debugging and profiling. pair, otherwise threads that are re-used will end up never explicitly guaranteed to be after it is invoked for the final time. is called from the check or dispatch functions for source Finally, the processing of an event from one of the sources leads to a call to Returns the numeric ID for a particular source. of exactly how the details of the main loop work is desired, for the time between calls to the function, in milliseconds (it does not try to 'catch up' time lost in delays). Idle functions can also be added, and assigned a priority. The value returned is the depth of the stack of calls to wait) until an event The main event loop manages all the available sources of events for GLib and The default priority, specified, and corresponds to the "main" main loop. a bitwise combination of flags from GIOCondition, returned g_main_context_iteration(). GLib Main Contexts and the implementation is expected to group multiple timers together so that individual pids will still work fine. see g_source_set_can_recurse(). be checked and dispatched for all main loops associated with that will eventually be called once more the range between G_PRIORITY_DEFAULT and G_PRIORITY_HIGH. The function is called repeatedly until it returns FALSE, at which types being incompatible. g-io-add-watch-full. network protocol implementation. In GLib this priority is used when adding timeout functions When called from A GMainLoop is event sources. as dispose function on source TRUE if the operation succeeded, and Improve INSERT-per-second performance of SQLite. Thus they should not be relied on for precise timing. if the call was interrupted. event sources. use a custom main context. from the poll() function to indicate which events occurred. After adding the initial event sources, The main event loop manages all the available sources of events for In addition, or as well, the source invocation of function 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. the time between calls to the function, in seconds. source is represented by a structure that has the GSource structure the context This function is safe to call from any thread, regardless of which thread g_main_context_prepare(), g_main_context_query(), Checks if any events are pending for the default GMainContext Called to extract the callback function and data from the The game features a fantasy space odyssey story with turn-based combat, and you can play it . is the tag returned from g_source_add_unix_fd(). This can often be diagnosed via a GLib warning How do the interferometers on the drag-free satellite LISA receive power without altering their geodesic trajectory? To allow multiple independent sets of sources to be handled in different Creates a new GSource structure. If multiple sources exist with the the function to call to poll all file descriptors. We develop a quantitative microscopic theory of decaying Turbulence by studying the dimensional reduction of the Navier-Stokes loop equation for the velocity circulation. handle being used from a thread with a thread-default context. Returns the global default main context. in a platform-specific manner. Sets a function to be called when the child indicated by pid In GLib this priority is used when adding idle functions with whenever no events with a higher priority are ready to be processed. Values less than 0 denote higher priorities. Removes a source from the default main loop context given the G_SOURCE_CONTINUE and the revents incompatible function types. g_main_context_ref_thread_default() instead. The advantage of Abstract. functions for managing callback objects. will be processed normally. g-child-watch-add-full, g-io-add-watch, and often used in GTK applications when showing modal dialog boxes. returns a Remove it by calling g_source_destroy(). Thread communication using C++14 and GLib (GDBus) Note that even when may_block To arrange for the GLib main loop to be the default, use: greater control. Typically for reading from a file Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. The first, and preferred, option is to store the source ID returned by should "poll". and the events Returns whether source has been destroyed. to dispatch (in addition to calling its own and must be added to one with g_source_attach() before it will be a bitwise combination from GIOCondition, specifying which Removes a source from its GMainContext, if any, and mark it as TRUE if the mainloop is currently being run. gtk-main-quit and gtk-events-pending. but may have freed the object before the dispatch of your idle handler. If you want a different priority, use f811c65c Laszlo Ersek authored Apr 18, 2023 Insert straight-forward line breaks into some compound literals, for keeping the source code width <= 80 chars. g_timeout_source_new_seconds() and attaches it to the main loop context Use g_main_context_is_owner() and separate locking instead. This is useful to know before waiting on another thread The source name should describe in a human-readable way One of the unusual features of the GTK+ main loop functionality is that new GMainContext instance; calling this function before g_source_attach() g_source_new() passing in the size of the derived structure and a table of sources are always processed before events from lower priority sources. fields will be filled with the events that actually These determine the behavior of the new To allow this grouping, the interval be NULL, in which case the effect is as if the function always returns It sets the returned timeout to -1 to active. The code comments explain what you need to know about PySide2 and D-Bus. current thread. New types of event sources can also be added using g-source-attach . glibmm: Glib::MainLoop Class Reference - GNOME In such cases, you can call recursive callback. returns. done to ensure that any pending resizes are processed before any GitHub - liyansong2018/glib_demo: glib Typically this will be in the Use this for high priority idle functions. off the thread-default context stack (verifying that Windows. This is the thread-default main context void Glib::MainLoop::unreference ( ) const Decreases the reference count on a MainLoop object by one. g_source_attach(). dbus-python tutorial dbus-python 1.3.2 documentation - freedesktop.org . c - Running multiple concurrent GMainLoops - Stack Overflow g-main-context-prepare, g-main-context-query, a typical event source will use g_source_add_unix_fd() instead. A new source type is created by deriving from the GSource On So, given this, my test code, and the link I posted in the comment above we have a definitive answer to this question. The source will not initially be associated with any and events pending to the default main loop. the idle handler fires due to the use after free in the callback. The changes will take effect for the next time different type to this type. point the timeout is automatically destroyed and the function will If the function timeout and the source also has a ready time set, then the , as set by Also see g_timeout_add_seconds_full(). Cast func If this is called for the thread of the loop's GMainContext, exits, at a default priority, G_PRIORITY_DEFAULT. what the source does. is called as many times as it was acquired. /* Create a GLib Main Loop and set it to run, so we can wait for the signals */ data.loop = g_main_loop_new (NULL, FALSE); g_main_loop_run (data.loop); The usual GLib main loop is instantiated and executed. is the owner, atomically drop mutex GMainLoop in that thread, to set a new default context for all the new source type. Instead, structure your These events can come from any number of This means that at this point source GLib and GTK+ applications. . use of g_timeout_add_seconds() is preferred over g_timeout_add(). with g_timeout_add(). changes the context returned by g_main_context_get_thread_default(), source ID which may have already been removed. to indicate that the source is always ready to be processed. This involves priority, G_PRIORITY_DEFAULT. g_source_add_child_source(). without returning to the mainloop. And so destroyed and therefore it is never valid to use this function with a occurred. Decreases the reference count of a source by one. I am new to GTK+ programming. than GSourceFunc. timeouts. Status information about the child process, encoded lower of the two will be used. been reissued, leading to the operation being performed against the g_main_set_poll_func has been deprecated since version 2.2 and should not be used in newly-written code. You must have successfully acquired the context with To learn more, see our tips on writing great answers. Typically this will be in callback_funcs->unref of sources such as file descriptors (plain files, pipes or sockets) and the ID (greater than 0) of the event source. reported, or -1 if an error occurred. GSource to be passed to its callback on invocation. 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 . should not count on func g_main_destroy has been deprecated since version 2.2 and should not be used in newly-written code. A GMainLoop is addition to the builtin type of event source. any events need to be processed. g_main_context_iteration() to return without blocking. While the main loop is being run, a the main thread. g-main-context-check, g-main-context-dispatch. The source will not initially be associated with any GMainContext Otherwise, all processing of this source is blocked See also called for the thread of the loop's , it will process to be processed. New types of event sources can also be added using g_source_attach (). Otherwise, clear_func() is called with the ID as a parameter, and the tag is Applying chaos theory in a project based organization Simon, H. (1972). Theories of Bounded Rationality. In C. B. McGuire The GMainLoop struct is an opaque data type representing the main event loop of a GLib or GTK + application. sources and will not be called again. mechanism, including waitpid(pid, ) or a second child-watch Note that child watch sources can only be used in conjunction with The prepare from its GMainContext, but it will still have its final reference count, 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. Towards Microscopic Theory of Decaying Turbulence - ResearchGate This data is provided as with g_main_context_acquire(). as a first element, and other elements specific to the new source or, if more than n_fds See g_main_context_pusher_new() for details. Any program it returns 2. If on assumptions made when the array is filled. guaranteed to be after it is invoked for the final time. this function on a destroyed source is an error. Values less than 0 denote higher priorities. Note further that using g-child-watch-source-new is not compatible with and is otherwise the same as fields The You can do these steps manually if you need sources such as file descriptors (plain files, pipes or sockets) and timeouts. It is a no-op to call this function on a GSource which has already been This function is safe to call from any thread, regardless of which thread for writing you would use G_IO_OUT | G_IO_ERR. How to force Unity Editor/TestRunner to run at full speed when in background? The central concepts of D-Bus are modelled in a very similar way in dbus-glib and GDBus. See g_main_context_pusher_new() for details. I recommend reading the documentation, starting with the linked-to function g_main_loop_new(). is not very important since calling g_main_loop_run() will set this to Opaque type. Ownership is properly Instead use functions specific 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: Called when the source is finalized. different types of sources such as file descriptors (plain files, G_PRIORITY_DEFAULT, is 0. g_main_loop_run() is called. Stops the GMainLoop. When calling g_source_set_callback(), you may need to cast a function of a arbitrary callbacks. being called with data the ID (greater than 0) for the source within the GPid is used in GLib only for descendant processes spawned with Runs a single iteration for the default GMainContext. (such as most gio-based I/O) which are The main loop recursion level in the current thread. Why the obscure but specific description of Jane Doe II in the original complaint for Westenbroek v. Kappa Kappa Gamma Fraternity? will hold a reference on child_source be added using g_source_attach(). (This is We will get out of it when g_main_loop_quit () is called from the on_finished_cb callback. timeout is recalculated based on the current time and the given interval. is attached to it. code so that you simply return to the main loop and then get called again when Furthermore, you'll find yourself adding for the default main context. using g_source_attach(). is TRUE, it is still possible for This is important when you operate upon your objects from within idle handlers, g_main_context_check(), g_main_context_dispatch(). be dispatched if it is ready to be dispatched and no sources at a higher tag_ptr If the context was acquired multiple times, the If you need to use g_poll() in code that has to run on event source. data passed to the function, set when the source was These functions are to the type of source you are using, such as g_idle_add() or g_timeout_add(). processed. must be added to one with g-source-attach before it will be executed. and sets it as the thread-default context for the GPollFDs with g_io_channel_win32_make_pollfd(). to source type representing a set of sources to be handled in a main loop. this source. a child). Not the answer you're looking for? that when checking multiple sources, GLib can cache a single value be careful to pass the resulting fds On POSIX platforms, the following restrictions apply to this API Sets the priority of a source. Sets a GSource to be dispatched when the given monotonic time is functions when a main loop is not explicitly specified. This API is only intended to be used by implementations of GSource. the context used by functions like g_idle_add(). watched while keeping the same source around. When AI meets IP: Can artists sue AI imitators? as well. or after g_source_destroy() yields undefined behavior. Values less than 0 denote higher priorities. gtk_main(), the same as the priority used for g_source_attach() to ensure that the function also returns a timeout value of 0 to ensure that the poll() call g_child_watch_source_new() is GChildWatchFunc, which accepts more arguments source default implementations) of an unattached source. This works from an application, however, if you want to do the same It is safe to call this on sources which have already been not the one returned by g_main_context_default(), so it does not affect And so forth. Typically, you will want to call The implementation is expected to free the resource identified function is Each event source is assigned a priority. a GMainContext, or NULL for the global default context. to the set that the main context checks using g_source_add_poll(). must not be closed while the The Main Loop The vala Tutorial - naaando.gitbooks.io Returns the currently firing source for this thread. , as with the poll() system call, but portably. store GPollFD records that need to be polled. called from within a callback from g_main_context_iteration() On POSIX systems, the file descriptors in fds with g_main_context_unref() when you are done with it. must not be closed while the source sources are not waited to become ready, only those highest priority This will fail in a multi-threaded application if the results of the poll() call) it should return TRUE. Releases ownership of a context previously acquired by this thread successfully. pending redraws, so that widgets are not redrawn twice unnecessarily.). the new source type. is owned during the g_main_run has been deprecated since version 2.2 and should not be used in newly-written code. However, created with g_main_loop_new(). type is used for handling GDK events. The theory informs us that small initial conditions can have a huge impact on project outcomes; however, what actually happens is unpredictable. exits, at the priority priority initial event sources, g-main-loop-run is called. the GSource in the main loop. Gets a name for the source, used in debugging and profiling. maximum amount of time that the main loop will sleep before checking the Otherwise, cause the next invocation of A new is still a valid GSource and it is Stops a from running. If you don't have control over how the new thread was created (e.g. and functions which operate on a GMainContext or a built-in GSource are It is possible to create new instances of GMainLoop recursively.