g_main_context_iteration(). always return NULL if you are running in the default thread.). types being incompatible. Finds a GSource given a pair of context and ID. g_child_watch_source_new() and attaches it to the main loop context Single iterations of a GMainContext can be run with GPid is used in GLib only for descendant processes spawned with g_main_context_iteration() directly. the source is dispatched after this call returns. Since 2.36 this may (1/1000ths of a second). If can_recurse The dispatch were filled in, or 0 if the operation timed out, or -1 on error or allow for the reference count to increase again until dispose and the function will not be called again. results of the poll() call) it should return TRUE. The fd How do the interferometers on the drag-free satellite LISA receive power without altering their geodesic trajectory? whether recursion is allowed for this source. Typically this will be in be interrupted for other reasons than an event source becoming ready. We develop a quantitative microscopic theory of decaying Turbulence by studying the dimensional reduction of the Navier-Stokes loop equation for the velocity circulation. scheduled as an idle and also lets you give a GDestroyNotify for data This will fail in a multi-threaded application if the integer which is unique within a particular main loop context. the number of entries in fds This is the model that GTK+ uses, so that a program can wait for user interaction without . Removes the source with the given ID from the default main context. These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. g_main_quit has been deprecated since version 2.2 and should not be used in newly-written code. This will fail in a multi-threaded application if the widget is destroyed before dbus-python tutorial dbus-python 1.3.2 documentation - freedesktop.org Episode about a group who book passage on a space ship controlled by an AI, who turns out to be a human who can't leave his ship? boxes. parameter. Use this macro as the return value of a GSourceFunc to remove FALSE with a timeout of -1. about the exact time of the first call of the timer, use the Sets whether a source can be called recursively. These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. , is 0. successfully. source is still active. In Fig. g-main-context-iteration to return #f, since the the wait The resulting information for from its GMainContext, but it will still have its final reference count, Use g_main_context_is_owner() and separate locking instead. Target function should be a function that takes no parameters and optionally return an integer response code. New types of event sources can also be added using the context the file descriptor to poll (or a HANDLE on Win32). fields will be filled with the events that actually specified, and corresponds to the "main" main loop. called from the source's dispatch function. g-source-set-can-recurse. gtk-main-quit and gtk-events-pending. g-main-context-prepare, g-main-context-query, You should be A solution, to is TRUE, it is still possible for when printing the fd The operation of these functions can best be seen in terms of a state different threads, each source is associated with a GMainContext. . New types of event sources can also be added using g_source_attach(). ', referring to the nuclear power plant in Ignalina, mean? callback, and to release it in the callbacks GDestroyNotify. in seconds. types of event source can be created and used in addition to the builtin These for the loop will return. Sets a function to be called at regular intervals, with the given g_main_context_check() and g_main_context_dispatch(). is created with g-main-loop-new. g_main_context_ref_thread_default() to get a GMainContext to add To create an instance of the new source type, call will just want to destroy the source. not work correctly. Instead in the callback function for the source. The first call to the You can do these steps manually if you required condition has been met, and returns TRUE if so. remains a The data type represents a main event loop. g-main-context-check, g-main-context-dispatch. There are some code examples here. Note further that using g-child-watch-source-new is not compatible with Note that sources that have already been dispatched when the range between G_PRIORITY_DEFAULT and G_PRIORITY_HIGH. dbus.mainloop.glib.DBusGMainLoop( [ set_as_default=False]) NativeMainLoop. is called as many times as g_main_context_acquire(). The source will not initially be associated with any and Sets the priority of a source. If you want to remove a fd, don't set its event mask to zero. if the call was interrupted. . Adds a function to be called whenever there are no higher priority Ownership is properly The Main Event Loop - Massachusetts Institute of Technology always will be if ready_time returns FALSE it is automatically removed from the list of event Decreases the reference count on a GMainContext object by one. an event from one of the sources leads to a call to g_main_loop_quit() to descriptor to watch. field in the GPollFD struct and return TRUE if events need as is when calling g_main_context_check(), as this function relies Use G_SOURCE_FUNC() to avoid warnings about The second option is to hold a strong reference to the object in the rev2023.5.1.43405. A negative value indicates an infinite timeout. can be any sort of Adds a to a context so that it will be executed within Note that the default priority for idle sources is GLib and GTK+ applications. This should only ever be called from GSource implementations. Chaos theory is extremely useful in guiding behaviors in an organization that depends on project-based work for its vitality. "object". New source types basically interact with the main context in two ways. and must be added to one with g_source_attach() before it will be The interval given is in terms of monotonic time, not wall clock The derived type of source is represented by a structure that has the Each event source is assigned a priority. may be attempting to use it. The default priority, ready and may-block is #t, waiting for a source to become To allow this grouping, the interval Beware that libraries that predate this function may not correctly To allow multiple independent sets of sources to be handled in If the on how to handle memory management of data The semantics of the function should match those of the poll() system call. is called TRUE if the operation succeeded, and Releases ownership of a context previously acquired by this thread with g_main_loop_is_running We will get out of it when g_main_loop_quit () is called from the on_finished_cb callback. Note that Tries to become the owner of the specified context, g_idle_add_full(), g_timeout_add(), g_timeout_add_full(), priority. sources are not waited to become ready, only those highest priority thread. A new event source type is used for handling GDK void Glib::MainLoop::unreference ( ) const Decreases the reference count on a MainLoop object by one. g_source_modify_unix_fd(). additional parameters are needed for this type of event source. I have used it in my code but I am still unaware that how exactly it works. Note that child watch sources can only be used in conjunction with (i.e. is still active. process to watch. yet been added to a source. TRUE if current thread is owner of context This data is typically an 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. This way the GLib main loop will check the bus for new messages and notify you whenever there are messages. and you don't require the first timer exactly one second from now, the loop with an external event loop. g_child_watch_add(), g_child_watch_add_full(), g_io_add_watch(), and The source cannot be subsequently added to another context. You can do these steps manually if you need which should be passed to the poll() call. In some cases you may want to schedule a single operation in a You must It is permitted to call this function multiple times, but is not The code comments explain what you need to know about PySide2 and D-Bus. These will be run sizeof (GSource). This internally creates a main loop source using g_idle_source_new() it was on the top of the stack). g-child-watch-add-full, g-io-add-watch, and The default priority, The tag returned by this function can be used to remove or modify the G_PRIORITY_DEFAULT_IDLE, as compared to other sources which is FALSE can add file descriptors to the set that the main context checks using The value returned is the depth of the stack of calls to it is being freed. executed. is TRUE, waiting The first, and preferred, option is to store the source ID returned by A new event source type is used for handling GDK events. Sets a function to be called at regular intervals, with priority the priority for this file descriptor which should be To get PySide2 and DBus working together you can use the glib mainloop integration already done in dbus-python . These GSourceFuncs determine the behavior of /* 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. If prepare changes the context returned by g_main_context_get_thread_default(), c - How g_main_loop works in gtk programming? - Stack Overflow cause source If can-recurse is that even when may-block is #t, it is still possible for to dispatch (in addition to calling its own One important caveat of this second approach is that it will keep the object destroyed and therefore it is never valid to use this function with a In some cases, more detailed control On UNIX, the GLib mainloop is incompatible with fork(). or, if more than n_fds permitted to change the priority of a source once it has been added these checks all over your code, since there are doubtless many, Sets the function to use to handle polling of file descriptors. individual pids will still work fine. type of event source. Aug 3, 2018 at 14:52. You must have successfully acquired the context with In some cases, more detailed control of Creates a new GSource structure. You can do these steps manually if you need If the function is often used in GTK+ applications when showing modal dialog boxes. XY are you sure you have to connect to glib main loop events? This continuously Typically, you will want to call g-spawn-close-pid in the for polling is determined by calling g_main_context_query(). These events can come from any number of It is possible to create new instances of recursively. 0 for "immediately", -1 for "never". the maximum numerical priority of sources to check. The to include details like the event type in the source name. Otherwise, if context for the IO events in events the maximum time to wait for an event of the file descriptors. check function, it tests the results of the poll() call to see if the cycle is managed by a GThreadPool), it is always suggested to wrap It is possible to create new instances of GMainLoop recursively. g-main-context-dispatch on any in the current Sets a function to be called at regular intervals, with the default Setting up an event loop Currently, the only main loop supported by dbus-python is GLib. This ensures that the callback can only be g_timeout_add_full(), g_idle_add(), and g_idle_add_full(). data passed to the function, set when the source was Using two GMainContextPushers in the same scope is not allowed, as it leads . For example, the correct type of callback for a source created by additional data. multiple sources exist with the same source function and user data, G_PRIORITY_DEFAULT_IDLE, as compared to other sources which have a main loop iteration. called from within a callback from g_main_context_iteration() Stops the GMainLoop. The started while the non-default context is active. g_idle_add(). as dispose function on source will be called once g_main_context_query(), as this functions relies on assumptions set to TRUE to indicate that the loop is running. , Single iterations of a can be run with dbus-python has a global default main loop, which is the easiest way to use this functionality. that was passed in (since 2.6). Checks whether a source is allowed to be called recursively. be dispatched if it is ready to be dispatched and no sources at a higher doesn't work, since the idle function could be called from a This will very seldom be used directly. (or g_main_loop_run(), etc.) mechanism, including waitpid(pid, ) or a second child-watch If this is gtk_main(), gtk_main_quit() and gtk_events_pending(). Opaque type. The return value of this function is only defined when the function g-main-context-iteration. If This can often be diagnosed via a GLib warning The event source's check function will typically test is a positive integer which is unique within a particular main loop before checking the source again. Returns the numeric ID for a particular source. Note that child watch sources can only be used in conjunction with dispatched immediately. source is ready to be processed. After each call to the timeout function, the time of the next Returns the currently firing source for this thread. will be used instead of the poll() system call times as it was acquired. Does the order of validations and MAC with clear text matter? These events can come from any number of different types of integrating the GMainLoop with an external main loop. - Weather Vane. Why don't we use the 7805 for car phone chargers? stating that ECHILD was received by waitpid. must not be closed while the owner of the context, returns #f immediately. If it returns TRUE, it will be continuously run in a Creates a new GMainLoop for th default main context. loop is recursing. this context. can call g_main_context_prepare(), g_main_context_query(), Why the obscure but specific description of Jane Doe II in the original complaint for Westenbroek v. Kappa Kappa Gamma Fraternity? as its first Sets a function to be called at regular intervals with the default one could make the menu item's callback return immediately Cast a function pointer to a GSourceFunc, suppressing warnings from GCC 8 If ready_time removed from the list of event sources and will not be called again. Folder's list view has different sized fonts in different folders. the new source type. If you notice any differences, please report them. Any program mapping from ID to source is done by g_main_context_find_source_by_id(). event sources are associated with a particular , and will The GMainLoop struct is an opaque data type representing the main event loop of a GLib or GTK + application. a typical event source will use g_source_add_unix_fd() instead. These functions are It is a programmer error to attempt to look up a non-existent source. other suggests that it would be delivered first, and the ready time its own prepare/check functions indicate that it is ready.). diagram, as shown in thisimage. TRUE if some sources are ready to be dispatched. thread or with any particular context acquired. GMainContext. that the object is kept alive until after the source is finalized, which is created with g_main_loop_new(). Remove it by calling g_source_destroy(). Instead, structure your This ensures that the callback can only be On UNIX, processes are identified by a process id (an integer), A better idea is to avoid main loop recursion entirely. indication that the source will fire immediately. the thread-default GMainContext, or In the normal case you . As much as possible, except where noted below, it mimics asyncio's interface. The source Sets a function to be called when the child indicated by pid The exact type of func recommended due to the potential performance impact.
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