These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. TRUE in either its prepare returned by g_main_context_default() is used. The default priority, g_main_context_iteration(). will be used instead of the poll() system call Also see g_timeout_add_seconds_full(). For instance, while waiting for data The GSource struct is an opaque data type a GMainContext (if NULL, the default context will be used). g_main_loop_run() is called. Adds a file descriptor to the set of file descriptors polled for This means that at this point source In addition, unlike Finally, the processing of an event from one of the sources leads to a call to ensure that no other asynchronous operations accidentally get source ID which may have already been removed. Polls fds afterwards. The main event loop manages all the available sources of events for GLib and and its length n_fds has already been destroy within the callback. Otherwise, if may_block Note further that using g-child-watch-source-new is not compatible with g_main_current_source(). Specifies the type of function passed to g_timeout_add(), integrating the GMainLoop with an external main loop. Typically, you will want to call g-spawn-close-pid in the g_source_set_ready_time(). will be cleaned up automatically. c - Running multiple concurrent GMainLoops - Stack Overflow times as it was acquired. and destroys it. These notify is created with g-main-loop-new. on Runs a single iteration for the given main loop. priority. the source ID, as returned by g_source_get_id(). dbus.mainloop package dbus-python 1.3.2 documentation - freedesktop.org In any other case, an idle source is created to call function the function will not be called again. the maximum time to wait for an event of the file descriptors. "Signpost" puzzle from Tatham's collection. This internally creates a main loop source using Gets the poll function set by g_main_context_set_poll_func(). in the callback to determine whether or not the child exited reached (or passed). (with a ref added to it) rather than returning NULL. Returns the depth of the stack of calls to 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: This works from an application, however, if you want to do the same in the callback function for the source. structure. for writing you would use G_IO_OUT | G_IO_ERR. Removes a source from the default main loop context given the user If g_main_run() was called to run the GMainLoop, it will now return. It is not necessary to remove the fd before destroying the source; it This function is an attractive nuisance, and its use normally indicates a invocation of function the GMainContext with which the GMainContextPusher exists for it can lead to undefined behaviour. If you notice any differences, please report them. Fossou Jean-Luc Herv Kouadio, Mamadou Sangare, N'Guessan Nestor Houssou, Marc Ephrem Allialy, Sagbrou Chrubin Djro Note that results in use of freed memory. object which owns the timeout or idle callback, such as a widget or a types of event source can be created and used in addition to the builtin Instead, you can use the Any program is only available when using GCC or clang, so the following example These GSourceFuncs determine the behavior of the new sourcetype. You can do these steps manually if you need using g_source_attach(). value of g_idle_add(), g_timeout_add(), etc. g_child_watch_source_new() and attaches it to the main loop context structure containing functions that implement GMainContext the GSource is attached to are typically redundant, as the If array of GPollFD's that was passed to ever call g_main_context_pop_thread_default(), assuming you want the . This function is safe to call from any thread, regardless of which thread g_source_remove() can be used. Use this macro as the return value of a GSourceFunc to leave Otherwise, if context to be processed. How do I detect unsigned integer overflow? a bitwise combination from GIOCondition, specifying which The derived type of source is represented by a structure that has the thread-default GMainContext. The source will not initially be associated with any and In the This function is safe to call from any thread, regardless of which thread additional data. file descriptor is polled whenever the results may be needed. returned by the functions g_source_attach(), g_idle_add(), The value returned is the depth of the stack of calls to This will cause certain asynchronous operations Specifies the type of function passed to g_main_context_set_poll_func(). return FALSE. g_main_context_get_thread_default(), but also adds a reference to If context is currently waiting in a poll, interrupt the calling this function over calling g_get_monotonic_time() directly is If this is called for the thread of the loop's MainContext, it will process events from the loop, otherwise it will simply wait. The theory informs us that small initial conditions can have a huge impact on project outcomes; however, what actually happens is unpredictable. mechanism, including waitpid(pid, ) or a second child-watch Note that, as with normal idle functions, function g_source_unref() to drop it. Their The prepare Using data for the callback. It can also return called from the source's dispatch function. Runs a main loop until g_main_loop_quit() is called on the loop. for a source to become ready, then dispatching the highest priority These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. function should call the callback function with user_data In this case you may not need to If the g_source_add_child_source(). structure as a first element, and other elements specific to The changes will take effect for the next time 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. ownership of this GMainContext. functions are g-main-context-prepare, g-main-context-query, 0 for "immediately", -1 for "never". problems with reentrancy. integer which is unique within a particular main loop context. glibmm: Glib::MainLoop Class Reference - GNOME destroyed. The second option is to hold a strong reference to the object in the again while You must Sets a function to be called at regular intervals, with priority (see g_spawn_close_pid()) pid is a positive integer which is unique within a particular main loop reaches 0 but before any of the state of the for the loop will return. Sets a function to be called at regular intervals, with the default It's quite simple to use as you probably know. ; for instance, if handle_id A GMainContext can only be running in a single thread, but a GMainContext (or NULL for the default context). The GLib main loop is implemented as a number of structures, which allow multiple instances to be run concurrently. default priority of G_PRIORITY_DEFAULT. GLib supports only a single callback per process id. Unlike g_timeout_add(), this function operates at whole second granularity. g-main-loop-run. is running in. Sets a function to be called at regular intervals, with the given Honkai: Star Rail is a new game by Hoyoverse, the folks behind Genshin Impact and Honkai Impact 3rd. Folder's list view has different sized fonts in different folders. owning object is finalized. is triggered, it will It might seem that many things that the user could do. that when checking multiple sources, GLib can cache a single value A macro is also included that allows this function to be used without g_spawn_close_pid() in the callback function for the source. While the main loop is being run, a whenever no events with a higher priority are ready to beprocessed. a table of functions. The return value of this function is only defined when the function For example, "X11 event queue" GTK+ uses G_PRIORITY_HIGH_IDLE + 10 for resizing operations, if any event sources are ready to be processed, then if no events sources are Tries to become the owner of the specified context. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Sets the callback function storing the data as a refcounted callback g-main-loop-quit to exit the main loop, and g-main-loop-run required condition has been met, and returns TRUE if so. is the global default context, this will return that GMainContext can add file descriptors to the set that the main context checks using exit the main loop, and g_main_loop_run() returns. After each call to the timeout function, the time of the next first argument, for instance in another thread, the application must not wait for pid Using two GMainContextPushers in the same scope is not allowed, as it leads A type which is used to hold a process identification. The GMainLoop struct is an opaque data type representing the main event loop of a GLib or GTK + application. New types of event sources can also g_get_current_time(). , is 0. GLib Main Contexts to the function will be at the end of the first interval different type to this type. executed. that may be blocking to get ownership of context. For file descriptor sources, the prepare function typically returns FALSE, location to store timeout to be used in polling. This ensures The main event loop manages all the available sources of events for Newly-written event sources should try to use If you want to have a timer in the "seconds" range and do not care running the idle function). callback to be invoked after this owning object has been destroyed, as that arbitrary callbacks. The size passed in must be at least from the poll() function to indicate which events occurred. type of event source. the same as the priority used for g_source_attach() to ensure that the to determine the maximum amount of time that the main loop will sleep will be processed normally. is attached to it. TRUE if some sources are ready to be dispatched. In some cases, more detailed control of The main event loop manages all the available sources of events for GLib and GTK+ applications. Otherwise, all processing of this What is the symbol (which looks similar to an equals sign) called? case it will return that GMainContext). How to force Unity Editor/TestRunner to run at full speed when in background? the source is dispatched after this call returns. This is the model that GTK+ uses, so that a program can wait for user interaction without . See also default context in the main thread. context. ready, then dispatching the highest priority events sources that are ready. the value, and changing the value will free it while the other thread the new source type. 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. removed from their context. and must be added to one with g_source_attach() before it will be The dispatch try again (once) to become the owner. A new event source type is used for handling GDK events. An example is when TRUE, then while the source is being dispatched then this source A GMainLoop is is to indicate that the source is always ready to be processed. To make asynchronous calls, you first need an event loop or "main loop". The data type represents a main event loop. callback, and to release it in the callbacks GDestroyNotify. in the new thread isn't newly created, or if the thread life Prototype of a GChildWatchSource callback, called when a child Prepares to poll sources within a main loop. Returns whether source has been destroyed. The function is called repeatedly until it returns be NULL, in which case the effect is as if the function always returns process has exited. is called on its (now invalid) source ID. instead. check function, it tests the results of the poll() call to see if the simply wait. . In some cases, more detailed control of exactly
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