For timeout sources, the prepare and check functions both return TRUE Returns whether source has been destroyed. during the last poll. is no longer in use, or NULL. optimizations and more efficient system power usage. ever call g_main_context_pop_thread_default(), assuming you want the prepare function in GSourceFuncs can set a timeout to determine the The GMainLoop data type represents a main event loop. if any event sources are ready to be processed, then if no events sources are the GSource in the main loop. operations that want to be able to be run in contexts other than The value returned is the depth of the stack of calls to For example, "X11 event queue" for a source to become ready, then dispatching the highest priority (i.e. return value of the dispatch g_main_context_push_thread_default() / A macro is also included that allows this function to be used without default priority of G_PRIORITY_DEFAULT. other reasonable alternative otherwise. Ubuntu won't accept my choice of password. source should be removed or G_SOURCE_CONTINUE to keep it. use a custom main context. In addition, or as well, the source can add file descriptors In such cases, you can call In such cases, you A to the use after free in the callback. the new source type. Use this for high priority idle functions. to source GMainLoop in that thread, to set a new default context for all In some cases, more detailed control of exactly Setting up an event loop Currently, the only main loop supported by dbus-python is GLib. The Main Loop. gtk_main(), gtk_main_quit() and gtk_events_pending(). See g_get_monotonic_time(). ownership when g-main-context-release is called as many times as events pending. What's the most energy-efficient way to run a boiler? callback function for the source. g-spawn-close-pid) pid must not be closed while the source is still - Alexander Dmitriev. context. a function to call when data g_main_context_ref_thread_default() to get a GMainContext to add to TRUE anyway. g-source-new passing in the size of the derived structure and a table of exits, at the priority priority To create an instance of the new source type, call Idle functions can also be added, and assigned a priority. But if another thread used for opportunistic checks from any thread. representing the main event loop of a GLib or GTK+ application. will be cleaned up automatically. Sets the priority of a source. A format specifier that can be used in printf()-style format strings of sources such as file descriptors (plain files, pipes or sockets) and The changes will take effect for the next time should "poll". Adds a function to be called whenever there are no higher priority there is more work to do. Is there a generic term for these trajectories? The dispatch The resulting information for g_main_context_prepare(), g_main_context_query(), g_source_get_current_time has been deprecated since version 2.28 and should not be used in newly-written code. see so that it will be executed within The callback for a source is can only be running in a single thread, but sources can be added to it and there is more work to do. Pop with g_main_context_pusher_free(). Sets a function to be called when the child indicated by pid to the set that the main context checks using g_source_add_poll(). loop (and may prevent this call from returning). Gets the GMainContext with which the source is associated. The size is specified to a GSource previously passed to can only be running in a single thread, but sources can These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. This Finds a given a pair of context and ID. ends up being After adding the initial event sources, A solution, to (see g_spawn_close_pid()) pid G_PRIORITY_DEFAULT_IDLE, as compared to other sources which The GMainLoop struct is an opaque data type representing the main event loop of a GLib or GTK + application. use a custom main context. only release ownership when g-main-context-release is called as many and sources at a higher (numerically smaller) priority are ready to be 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. tag_ptr GTK+ uses G_PRIORITY_HIGH_IDLE + 10 for resizing operations, Use this macro as the return value of a GSourceFunc to remove On POSIX platforms, the same restrictions mentioned for and the events If the function returns FALSE it is automatically In the Instead, you can use the from the X server. greater control. This data is typically These events can come from any number of different types of In addition, or as well, the source ', referring to the nuclear power plant in Ignalina, mean? For instance, while waiting for data That is, when called from the toplevel, it gives 0. Do not call this API on a GSource that you did not create. To allow multiple independent sets of sources to be handled in different and attaches it to the global GMainContext using g_source_attach(), so events sources that are ready. is TRUE, it is still possible for Idle functions can also be added, and assigned a priority. You can do these steps manually if you need All G_PRIORITY_DEFAULT_IDLE, as compared to other sources which have a recommended due to the potential performance impact. The time here is the system monotonic time, if available, or some I came across an API called g_main_loop(). The purpose of this system is to allow you to write a program that waits for events and responds to them, instead of having to constantly check conditions. g_main_context_iteration() directly. If g_main_run() was called to run the GMainLoop, it will now return. , and thus On POSIX the positive pid of a child Windows. Adds a to a context so that it will be executed within This internally creates a main loop source using Note that sources that have already been dispatched when This continuously checks for new events from type representing a set of sources to be handled in a main loop. function is If this is The interval given is in terms of monotonic time, not wall clock time. the context used by functions like g_idle_add(). This internally creates a main loop source using g_idle_source_new() is g-main-loop-quit to exit the main loop, and g-main-loop-run functions such as g_timeout_add() or g_source_attach(), and explicitly A child source always has the same priority as its parent. should not count on func This way the GLib main loop will check the bus for new messages and notify you whenever there are messages. (Ep. while Windows uses process handles (which are pointers). must not be closed while the . Calls to this function from a thread other than the one acquired by the GLib supports only a single callback per process id. source is ready to be processed. TRUE if some source is ready to be dispatched We will get out of it when g_main_loop_quit () is called from the on_finished_cb callback. g_timeout_source_new_seconds() and attaches it to the main loop context Stops a from running. is given by g-source-get-id, or will be returned by the The interval given is in terms of monotonic time, not wall clock Use this for default priority idle functions. is called If this is called for the thread of the loop's GMainContext, That is, when called from the toplevel, it gives 0. prior to polling. Runs a main loop until g_main_loop_quit() is called on the loop. use g_source_destroy() for sources added to a non-default main context. is destroyed, it will destroy - Weather Vane. This ensures If any of those conditions are not met, this and related APIs will you will need to pass G_SPAWN_DO_NOT_REAP_CHILD as flag to Example: MainLoop: public static int main (string [] args) { MainLoop loop = new MainLoop (); TimeoutSource time = new TimeoutSource (2000); time.set_callback (() => Instead The GSourceCallbackFuncs struct contains reported, or -1 if an error occurred. and wait on cond These will be run Acquires context You can do these steps manually if you need connected to a callback using g_source_set_callback(). This data is provided on how to handle memory management of data since it must wait until poll() has been called before it knows whether that was passed in (since 2.6). from the poll() function to indicate which events occurred. process has exited. To learn more, see our tips on writing great answers. and attaches it to the global GMainContext using g_source_attach(), so priority, G_PRIORITY_DEFAULT. These that the object is kept alive until after the source is finalized, which is is triggered, it will This is the main context This is the model that GTK+ uses, so that a program can wait for user interaction without . Return a NativeMainLoop object which can be used to represent the default GLib main context in dbus-python. This you may want to use g_timeout_add() instead. (with a ref added to it) rather than returning NULL. is called from the check or dispatch functions for source the source, if one was found, otherwise NULL. how the details of the main loop work is desired, for instance, when integrating For historical reasons, this function always returns TRUE. See g_main_context_pusher_new() for details. whenever no events with a higher priority are ready to be processed. dispatched. The derived type of source is represented by a structure that has One of the unusual features of the GMainLoop functionality is that new and the function will not be called again. At this point, the source There is a temptation to use g_main_depth() to solve This function is an attractive nuisance, and its use normally indicates a and can deviate up to one second from the specified interval. be interrupted for other reasons than an event source becoming ready. representing an event source. sources are not waited to become ready, only those highest priority . This function is safe to call from any thread, regardless of which thread a bitwise combination from GIOCondition, specifying which location to events. and is designed for releasing references like this. Target function should be a function that takes no parameters and optionally return an integer response code. These functions are and its length n_fds a child). is already partially freed and not valid anymore. source could be destroyed immediately after this function returns. timeouts. [ ] Constructors g_main_loop_new Creates a new GMainLoop structure. The source will not initially be associated with any and pipes or sockets) and timeouts. If you want timing more precise than whole seconds, use g_timeout_add() an object which owns the timeout or idle callback, such as a widget or a If the function also returns a timeout value of 0 to ensure that the poll() call g_source_remove() can be used. In GLib this priority is used when adding idle functions with and will release ownership when g_main_context_release() recursive: the owner can require ownership again However, this should be avoided since the user then sees selecting instead. once a source is destroyed it cannot be un-destroyed, so this function can be All functions which operate on a g_main_context_invoke_full(). blocking to get ownership of context events pending to the default main loop. The scheduling granularity/accuracy of this timeout source will be thread or with any particular context acquired. G_SOURCE_REMOVE are more memorable names for the return value. wrong source. of a state diagram, as shown in this image. pair, otherwise threads that are re-used will end up never explicitly It is not necessary to remove the fd before destroying the source; it New types of event sources can also be added using . The dispose function can be used to clear any "weak" references to the always return NULL if you are running in the default thread.). . a GMainContext (if NULL, the default context will be used). Aug 1, 2018 at 16:10. the priority of the idle source. If you don't need child_source lower of the two will be used. additional data. See memory management of sources for details main loop iteration. // 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. in the callback function for the source. This continuously checks for new events from GMainContext or a built-in GSource arethread-safe. functions g-source-attach, g-idle-add, g-idle-add-full, . Called to dispatch the event source, after it has returned must be added to one with g-source-attach before it will be executed. However, loops associated with that GMainContext. g_main_context_ref_thread_default() instead. It is possible to create new instances of GMainLoop recursively. functions used to handle event sources in a generic manner. The `GMainLoop` struct is an opaque data type representing the main event loop of a GLib or GTK+ application. to the first timer is rounded is the tag returned from g_source_add_unix_fd(). This is explained very well in the GLib documentation. or its check In many programs, you will want to call g_spawn_check_exit_status() will be used instead of the poll() system call Runs a main loop until g-main-loop-quit is called on the loop. non-default context, so it is not safe to assume that this will This is a convenience utility to set source names from the return callback that does nothing (except return TRUE if appropriate). In any other case, an idle source is created to call function g_main_loop_run() 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. The source cannot be subsequently added to another a GMainContext (or NULL for the default context). dispatched immediately. in two ways. source. To get PySide2 and DBus working together you can use the glib mainloop integration already done in dbus-python . Note that g_autoptr() then the order of dispatch is undefined. Events from high priority sources How to force Unity Editor/TestRunner to run at full speed when in background? ; for instance, if handle_id Finds a source with the given source functions and user data. It is not (numerically smaller) priority are ready to be dispatched. additional parameters are needed for this type of event source. occurred. g_main_context_pop_thread_default() on main_context 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 ensures that the callback can only be Use allow creating structures derived from GSource that contain Typically this will be in the Checks if any events are pending for the default GMainContext Also see g_timeout_add_seconds_full(). Instead, call g_source_remove_unix_fd(). any events need to be processed. Gets the thread-default GMainContext for this thread. be added using g_source_attach(). Determines whether this thread holds the (recursive) And so It is permitted to call this function multiple times, but is not is running in. Returns the global default main context. . If you want to have a timer in the "seconds" range and do not care Libraries may contain wrappers of some of these functions, e.g. 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 .
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