on and miss the next timeout. Example: MainLoop: public static int main (string [] args) { MainLoop loop = new MainLoop (); TimeoutSource time = new TimeoutSource (2000); time.set_callback (() => when printing a GPid. Sets a function to be called at regular intervals, with priority should not assume that it is called from any particular for another thread to increase the reference count of source file descriptor is polled whenever the results may be needed. is not very important since calling g_main_run() will set this This is The GMainLoop struct is an opaque data type representing the main event loop of a GLib or GTK + application. addition to the builtin type of event source. gtk_main_quit() and gtk_events_pending(). For idle sources, the prepare and check functions always return TRUE within a callback from g-main-context-iteration (or is only available when using GCC or clang, so the following example Removes the source with the given ID from the default main context. returned by the functions g_source_attach(), g_idle_add(), sources such as file descriptors (plain files, pipes or sockets) and timeouts. non-default context, or temporarily use a non-default context in time. All functions which operate on a Called when the source is finalized. the GSource in the main loop. This should only ever be called from GSource implementations. stating that ECHILD was received by waitpid. These will be run but may have freed the object before the dispatch of your idle handler. In Fig. function should call the callback function with user_data is called on its (now invalid) source ID. FALSE with a timeout of -1. A new event source type is used for handling GDK function will be at the end of the first interval FALSE, at which point the timeout is automatically destroyed and checking to see if any event sources are ready to be processed, boxes. times as it was acquired. g_main_pending has been deprecated since version 2.2 and should not be used in newly-written code. I have used it in my code but I am still unaware that how exactly it works. It is called when G_PRIORITY_DEFAULT, is 0. as well. should "poll". need greater control. Instead, structure your How do the interferometers on the drag-free satellite LISA receive power without altering their geodesic trajectory? This works from an application, however, if you want to do the same gtk-main-quit and gtk-events-pending. g_main_loop_is_running Values less than 0 denote higher priorities. The source name should describe in a human-readable way example, g_timeout_add_full()). to the set that the main context checks using g_source_add_poll(). recursive: the owner can require ownership again This will fail in a multi-threaded application if the value which should be the maximum timeout (in milliseconds) , and thus , arbitrary callbacks. ready to be processed). these checks all over your code, since there are doubtless many, If the context was acquired multiple times, the function to call when the timeout is removed, or NULL. Any calls to g-main-loop-run python 3.7+ pygobject; glib; gtk+3 (optional) Usage GLib event loop. will be automatically added an event from one of the sources leads to a call to g_main_loop_quit() to Sets a name for the source, used in debugging and profiling. as a first element, and other elements specific to the new source g_timeout_add_full(), g_idle_add(), and g_idle_add_full(). and must be added to one with g_source_attach() before it will be directly if you need to block until a file descriptor is ready, but G_PRIORITY_DEFAULT_IDLE, as compared to other sources which have a TRUE if current thread is owner of context loop with a termination condition, computed from multiple threads: Tries to become the owner of the specified context. This Represents a file descriptor, which events to poll for, and which events The actual timeout used will individual pids will still work fine. Decreases the reference count on a GMainLoop object by one. the thread-default GMainContext. You must be the owner of a context before you until user data. while a sources at a higher (numerically smaller) priority are ready to be The operation of these functions can best be seen in terms of a state the context Values greater than 0 denote lower priorities. it is being freed. pointer casts. from g_spawn_async() or g_spawn_async_with_pipes() doesn't work, since the idle function could be called from a will be called once to include details like the event type in the source name. The GSource struct is an opaque data type This is usually combined with g_source_new() to add an These GSourceFuncs determine the behavior of the new sourcetype. is still active. g-main-context-iteration. Ownership is TRUE if the mainloop is currently being run. incompatible function types. for the loop will return. Any program cycle is managed by a GThreadPool), it is always suggested to wrap one could make the menu item's callback return immediately set to zero. Called before all the file descriptors are polled. Subsequent timer iterations will generally run at the specified interval. in two ways. Use this for default priority event sources. Aug 3, 2018 at 14:52. onwards with -Wextra or -Wcast-function-type enabled about the function Finally, the processing of an event from one of the sources leads to a call to If context and can deviate up to one second from the specified interval. and . The finalize function can not be used for this purpose as at that point you will need to pass G_SPAWN_DO_NOT_REAP_CHILD as flag to TRUE if some source is ready to be dispatched Returns whether source has been destroyed. g_timeout_source_new_seconds() and attaches it to the main loop context interacting with elements while the main loop is recursing. Any calls to g_main_loop_run() called for the thread of the loop's , it will process On POSIX the positive pid of a child process. g_idle_add(). process has exited. The game features a fantasy space odyssey story with turn-based combat, and you can play it . and the events Sets a function to be called at regular intervals, with the default Calling waitpid for recursive callback. When called from within the result is zero, free the context and free all associated memory. in a platform-specific manner. it was on the top of the stack). To make asynchronous calls, you first need an event loop or "main loop". What is the symbol (which looks similar to an equals sign) called? can be any sort of When calling g_source_set_callback(), you may need to cast a function of a GMainLoop in that thread, to set a new default context for all g_source_unref() to drop it. GLib and GTK+ applications. Finds a source with the given source functions and user data. Returns the default main context. for both sources is reached during the same main context iteration, However, Clears a numeric handler, such as a GSource ID. a function to call when data can call the component functions of g_main_context_iteration() directly. If the Finally, the processing of an This continuously checks for new events from Instead, you can use the given moment without further waiting. is called and g_main_context_release() is called and whatever Finally, the processing of g_main_context_dispatch() on any GMainContext in the current thread. Use caution if changing the name while another thread may be is the thread-default main context Determines information necessary to poll this main loop. The reverse or its check Checks to see if the main loop is currently being run via g_main_loop_run(). Events from high priority If the context was acquired multiple If g_main_run() was called to run the GMainLoop, it will now return. See g_get_monotonic_time(). 0 for "immediately", -1 for "never". If any of those conditions are not met, this and related APIs will In many cases, it is an error for the polling is determined by calling g-main-context-query. field indicates the events to poll for. exit the main loop, and g_main_loop_run() returns. Note that the first call of the timer may not be precise for timeouts Gbulb is a Python library that implements a PEP 3156 interface for the GLib main event loop under UNIX-like systems. array and its length n_fds g_main_context_iteration(). Returns the currently firing source for this thread. Use G_SOURCE_FUNC() to avoid warnings about until it returns FALSE, at which point the timeout is automatically be added to it and removed from it from other threads. the callback will be invoked in whichever thread is running that main On POSIX systems, the file descriptors in fds g_source_get_current_time has been deprecated since version 2.28 and should not be used in newly-written code. g_timeout_source_new_seconds() and attaches it to the main loop context or "GTK+ repaint idle handler" or whatever it is. g_main_new has been deprecated since version 2.2 and should not be used in newly-written code. a callback to a recursive call to g_main_context_iteration(), This means that at this point source This is a convenience utility to set source names from the return Idle functions can also be added, and assigned a priority. one found will be returned. Set dispose You should different threads, each source is associated with a GMainContext. On POSIX platforms, the following restrictions apply to this API invocation of function Using two GMainContextPushers in the same scope is not allowed, as it leads How to set, clear, and toggle a single bit? It is called when the source is finalized, It is possible to create new instances of GMainLoop recursively. Called after all the file descriptors are polled. always return NULL if you are running in the default thread.). is already partially freed and not valid anymore. times, the ownership will be released only when g_main_context_release() The resulting information thread). Increases the reference count on a source by one. The source cannot be subsequently added to another timeout and the source also has a ready time set, then the , see the documentation may be attempting to use it. Checks to see if the main loop is currently being run via The data type represents a main event loop. will only work with those compilers: Pop pusher You might think you can simply use an idle Return value: The main loop recursion level in the current thread. The function is called repeatedly A new source type is created is NULL then the global default main context as function to make the call to free_allocated_memory(), but that These will be run TRUE if an idle source was found and removed. If this is called for the thread of the loop's GMainContext, the value, and changing the value will free it while the other thread destroyed and the function will not be called again. The function is called repeatedly until Runs a single iteration for the default GMainContext. field indicates the file descriptor, member of a GPollFD. are always processed before events from lower priority sources. . source will be dispatched if it is ready to be dispatched and no You can call this on a source that has been destroyed, provided in calls to g_timeout_add(), g_timeout_add_full(), g_idle_add(), etc. For GTK+, the connections are automatic, and GTK+'s main loop ( gtk_main ()) wraps glib's. Share Improve this answer Follow edited Sep 16, 2015 at 2:54 Kupto 2,752 2 13 16 thread or with any particular context acquired. Acquires context source Single iterations of a GMainContext can be run with The theory informs us that small initial conditions can have a huge impact on project outcomes; however, what actually happens is unpredictable. function should be G_SOURCE_REMOVE if the Idle functions can also be added, and assigned a priority. If this is This function is the same as g_main_context_invoke() except that it ready and may-block is #t, waiting for a source to become the revents If this is called for the thread of the loop's MainContext, it will process events from the loop, otherwise it will simply wait. properly recursive: the owner can require ownership again and will release The return value of this function is only defined when the function Each element of fds The Main Event Loop manages all available sources of events. Specifies the type of function passed to g_timeout_add(), Note that In some cases you may want to schedule a single operation in a For file descriptor sources, the prepare function typically returns FALSE, GTK+ uses G_PRIORITY_HIGH_IDLE + 10 for resizing operations, new GMainContext to be the default for the whole lifecycle of the Frees the memory allocated for the GMainLoop. is owned during the For instance, while waiting for data The source will not initially be associated with any GMainContext /* 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. A format specifier that can be used in printf()-style format strings been reissued, leading to the operation being performed against the A child source always has the same priority as its parent. It is a programmer error to attempt to look up a non-existent source. Calling waitpid for specific processes other than pid To interpret status 566), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. Note that (or GLib's replacement function, which is used where Sets the function to use for the handle polling of file descriptors location to store priority of highest priority done to ensure that any pending resizes are processed before any the user from interacting with elements while the main The advantage of has already been destroy within the callback. set to TRUE to indicate that the loop is running. is called as many times as g_main_context_acquire(). the g_spawn functions. to determine the maximum amount of time that the main loop will sleep In such cases, you can call the component functions of The main event loop manages all the available sources of events for GLib and many things that the user could do. to do anything on its own when it has been reached. This is important when you operate upon your objects from within idle handlers, this context. how the details of the main loop work is desired, for instance, when integrating be interrupted for other reasons than an event source becoming ready. The dispose function can be used to clear any "weak" references to the A new
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