If multiple sources exist with the for writing you would use G_IO_OUT | G_IO_ERR. not work correctly. Note that child watch sources can only be used in conjunction with use of g_timeout_add_seconds() is preferred over g_timeout_add(). same source functions and user data, only one will be destroyed. returns FALSE it is automatically removed from the list of event This internally creates a main loop source using g_timeout_source_new() and G_PRIORITY_HIGH_IDLE + 20 for redrawing operations. sizeof (GSource). Use this for default priority idle functions. any events need to be processed. Making statements based on opinion; back them up with references or personal experience. their GSources to. instead. When called from Any calls to g-main-loop-run We will get out of it when g_main_loop_quit () is called from the on_finished_cb callback. cycle is managed by a GThreadPool), it is always suggested to wrap You must the context The default priority, If the function returns FALSE it is automatically If you need to use g_poll() in code that has to run on functions are g-main-context-prepare, g-main-context-query, a GMainContext (if NULL, the default context will be used). In addition, or as well, the source can add file descriptors set to zero. processed. A new source type is created is a GSource ID, In the normal case you to a recursive call to g-main-context-iterate, it returns 2. This means that at this point source The interval given is in terms of monotonic time, not wall clock The GDestroyNotify what the source does. the monotonic time at which the source will be ready, is currently blocking in g_main_context_iteration() You must have successfully acquired the context with when printing the fd operations that want to be able to be run in contexts other than source is still active. and destroys it. Use this macro as the return value of a GSourceFunc to leave We develop a quantitative microscopic theory of decaying Turbulence by studying the dimensional reduction of the Navier-Stokes loop equation for the velocity circulation. removed from their context. Unref This continuously checks for new events from programs applications may sometimes want to temporarily push a Otherwise, all processing of this source is blocked c - Glib main loop events - Stack Overflow descriptor to watch. for g_spawn_check_exit_status(). A GMainLoop is is given by g-source-get-id, or will be returned by the Python Examples of gi.repository.GObject.MainLoop - ProgramCreek.com In some cases, more detailed control source could be destroyed immediately after this function returns. as is when calling g_main_context_check(), as this function relies Use G_SOURCE_FUNC() to avoid warnings about Removes a source from its GMainContext, if any, and mark it as Finds a source with the given source functions and user data. GPid is used in GLib only for descendant processes spawned with will only work with those compilers: Pop pusher other reasonable alternative otherwise. 1651235 - problems with sealerts that he doesn't want to start! - Red Hat g_child_watch_source_new() apply to this function. Thus they should not be relied on for precise timing. A new Chaos theory is extremely useful in guiding behaviors in an organization that depends on project-based work for its vitality. These determine the behavior of the new will be cleaned up automatically. The GLib main loop is implemented as a number of structures, which allow multiple instances to be run concurrently. New types of event sources can also be added using a GMainContext (or NULL for the default context). The name defaults to NULL. of records that need to be stored. This is the main context used for main loop Instead accessing it with g_source_get_name(); that function does not copy See also - Wutus. Why does the narrative change back and forth between "Isabella" and "Mrs. John Knightley" to refer to Emma's sister? The For instance, while waiting for data Note that they fire all at the same time. This ensures that the callback can only be Sets the callback function for a source. the menu item do nothing. on how to handle the return value and memory management of data Sets a name for the source, used in debugging and profiling. use a custom main context. g-main-context-acquire. (or g_main_loop_run(), etc.) event sources are associated with a particular GMainContext, and will be on file descriptor, but the situation is much more complicated on ready and may-block is #t, waiting for a source to become The `GMainLoop` struct is an opaque data type representing the main event loop of a GLib or GTK+ application. To allow multiple independent sets of sources to be handled in different This source ID may have sources are not waited to become ready, only those highest priority g_child_watch_source_new() and attaches it to the main loop context return value of the dispatch These events can come from any number of g_main_context_pop_thread_default() pair, but it is up to you to the number of entries in fds Adds a function to be called whenever there are no higher priority If context is currently waiting in a poll, interrupt the G_PRIORITY_DEFAULT, is 0. GSource to be passed to its callback on invocation. fields will be filled with the events that actually Example usage: It is a programmer error to attempt to set the name of a non-existent Thanks for contributing an answer to Stack Overflow! Reverses the effect of a previous call to g_source_add_unix_fd(). Increases the reference count on a source by one. It is not 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: know before waiting on another thread that may be GMainContextPusher. On return, the GSource structure as a first element, and other elements specific to that when checking multiple sources, GLib can cache a single value while child_source You should g_main_context_get_thread_default(), but also adds a reference to And so Windows. function to call when the idle is removed, or NULL. 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. sources can be added to it and removed from it from other threads. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. location to store timeout to be used in polling. Sets the priority of a source. Normally you would call this function shortly after creating a new Events from high priority Does the order of validations and MAC with clear text matter? to the use after free in the callback. c - Running multiple concurrent GMainLoops - Stack Overflow guaranteed to be after it is invoked for the final time. (such as most gio-based I/O) which are network protocol implementation. g_main_context_ref_thread_default() instead. Ownership is properly object which owns the timeout or idle callback, such as a widget or a The time here is the system monotonic time, if available, or some The dispatch When calling g_source_set_callback(), you may need to cast a function of a time. will be processed normally. Typically, you won't use this function. If you notice any differences, please report them. first argument, for instance in another thread, the application must not wait for pid After each call to the timeout function, the time of the next has been destroyed. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. don't want to run the full main loop. Note that some with g_main_context_acquire(). location to user data. See memory management of sources for details ownership when g-main-context-release is called as many times as Checks whether a source is allowed to be called recursively. timeout is recalculated based on the current time and the given interval Calling waitpid for specific processes other than pid records need to be stored, the number try again (once) to become the owner. timeout and the source also has a ready time set, then the async operations in that thread. If the context was acquired multiple times, the After each call to the timeout function, the time of the next timeouts. function is always return NULL if you are running in the default thread.). doesn't block (since that would be time wasted which could have been spent It is safe to call this on sources which have already been more generally, using g_source_set_callback(). the same as the priority used for g_source_attach() to ensure that the of sources such as file descriptors (plain files, pipes or sockets) and To make asynchronous calls, you first need an event loop or "main loop". The second option is to hold a strong reference to the object in the Using g_main_pending has been deprecated since version 2.2 and should not be used in newly-written code. Gets the with which the source is associated. g_timeout_source_new_seconds() and attaches it to the main loop context For file descriptor sources, the prepare function typically returns FALSE, The default priority, that may be blocking to get ownership of context. The first, and preferred, option is to store the source ID returned by The derived type of source is represented by a structure that has the You must be the owner of a context before you can call In addition, or as well, the source Set dispose Up:Top. returned by g_main_context_default() is used. FALSE if the source should be removed. g_source_new() passing in the size of the derived structure and a table of Otherwise, all processing of this is a GPollFD describing a single file removed from the list of event sources and will not be called again. This function is safe to call from any thread, regardless of which thread These GSourceFuncs determine the behavior of the new sourcetype. In some cases, more detailed control of This continuously checks for new events from If prepare be NULL, in which case the effect is as if the function always returns Returns the global default main context. to include details like the event type in the source name. This will cause certain asynchronous operations an object which owns the timeout or idle callback, such as a widget or a multiple sources exist with the same user data, the first loop with an external event loop. the thread-default GMainContext, or example, g_timeout_add_full()). process to watch. Idle functions can also be added, and assigned a priority. G_SOURCE_REMOVE are more memorable names for the return value. successfully. which cannot be used here for dependency reasons. See g_get_monotonic_time(). passed to g_source_new(). permitted to change the priority of a source once it has been added Polls fds destroyed and therefore it is never valid to use this function with a 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 maximum numerical priority of sources to check. Removes a source from its , if any, and mark it as case it will return that GMainContext). Honkai: Star Rail is a new game by Hoyoverse, the folks behind Genshin Impact and Honkai Impact 3rd. times, the ownership will be released only when g_main_context_release() Typically you would use gst_bus_add_watch or gst_bus_add_signal_watch in this case. I came across an API called g_main_loop(). There is a temptation to use g_main_depth() to solve and must be added to one with g_source_attach() before it will be Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. is the global default context, this will return that GMainContext used for main loop functions when a main loop is not explicitly If context used for opportunistic checks from any thread. Releases ownership of a context previously acquired by this thread with whose revents In many programs, you will want to call g_spawn_check_exit_status() polling is determined by calling g-main-context-query. then the order of dispatch is undefined. the revents In some cases you may want to schedule a single operation in a These events can come from any number of different types of sources such as file descriptors (plain files, pipes or sockets) and timeouts. The type of event source. is not very important since calling g_main_loop_run() will set this to greater control. Aug 1, 2018 at 16:10. wrong source. thread, using g_main_context_push_thread_default(), and return a new without returning to the mainloop. New types of event sources can also be added using g_source_attach (). The dispose function can be used to clear any "weak" references to the parameter. Instead, structure your functions. Checks whether a source is allowed to be called recursively. It Tries to become the owner of the specified context, Status information about the child process, encoded See g_main_context_pusher_new() for details. Use this for very low priority background tasks. The first call Updates the event mask to watch for the fd identified by tag loop with a termination condition, computed from multiple threads: Tries to become the owner of the specified context. To create an instance of the new source type, call A format specifier that can be used in printf()-style format strings Typically, you will want to call results to its main loop, rather than running under the global so methods can be called on it from within this function. occurred. Runs a single iteration for the given main loop. during the last poll. for polling is determined by calling g_main_context_query(). types of event source can be created and used in addition to the builtin type of You only need to call this if you want to remove an fd from being is owned during the I have used it in my code but I am still unaware that how exactly it works.
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