gtk/gdk/gdk.c
Emmanuele Bassi 79c3ff3c4e threads: Do not release the GDK lock if it hasn't been acquired yet
Since GLib ≥ 2.41, attempting to release an unlocked mutex will abort(),
as it happens on most systems already.

Given the lack of proper documentation on how to use GDK with threads,
there is code in the wild that does:

    gdk_threads_init ();
    gdk_init ();

    ...

    gtk_main ();

instead of the idiomatically correct:

    gdk_threads_init ();
    gdk_threads_enter ();

    gtk_init ();

    ...

    gtk_main ();

    ...

    gdk_threads_leave ();

Which means that gtk_main() will try to release the GDK lock, and thus
trigger an error from GLib.

we cannot really fix all the wrong code everywhere, and since it does
not cost us anything, we can work around the issue inside GDK itself, by
trying to acquire the GDK lock inside gdk_threads_leave() with
trylock().

https://bugzilla.gnome.org/show_bug.cgi?id=735428
2014-08-26 20:07:33 -04:00

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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gdkversionmacros.h"
#include "gdkmain.h"
#include "gdkinternals.h"
#include "gdkintl.h"
#ifndef HAVE_XCONVERTCASE
#include "gdkkeysyms.h"
#endif
#include <string.h>
#include <stdlib.h>
/**
* SECTION:general
* @Short_description: Library initialization and miscellaneous functions
* @Title: General
*
* This section describes the GDK initialization functions and miscellaneous
* utility functions, as well as deprecation facilities.
*
* The GDK and GTK+ headers annotate deprecated APIs in a way that produces
* compiler warnings if these deprecated APIs are used. The warnings
* can be turned off by defining the macro %GDK_DISABLE_DEPRECATION_WARNINGS
* before including the glib.h header.
*
* GDK and GTK+ also provide support for building applications against
* defined subsets of deprecated or new APIs. Define the macro
* %GDK_VERSION_MIN_REQUIRED to specify up to what version
* you want to receive warnings about deprecated APIs. Define the
* macro %GDK_VERSION_MAX_ALLOWED to specify the newest version
* whose API you want to use.
*/
/**
* GDK_WINDOWING_X11:
*
* The #GDK_WINDOWING_X11 macro is defined if the X11 backend
* is supported.
*
* Use this macro to guard code that is specific to the X11 backend.
*/
/**
* GDK_WINDOWING_WIN32:
*
* The #GDK_WINDOWING_WIN32 macro is defined if the Win32 backend
* is supported.
*
* Use this macro to guard code that is specific to the Win32 backend.
*/
/**
* GDK_WINDOWING_QUARTZ:
*
* The #GDK_WINDOWING_QUARTZ macro is defined if the Quartz backend
* is supported.
*
* Use this macro to guard code that is specific to the Quartz backend.
*/
/**
* GDK_WINDOWING_WAYLAND:
*
* The #GDK_WINDOWING_WAYLAND macro is defined if the Wayland backend
* is supported.
*
* Use this macro to guard code that is specific to the Wayland backend.
*/
/**
* GDK_DISABLE_DEPRECATION_WARNINGS:
*
* A macro that should be defined before including the gdk.h header.
* If it is defined, no compiler warnings will be produced for uses
* of deprecated GDK APIs.
*/
typedef struct _GdkPredicate GdkPredicate;
struct _GdkPredicate
{
GdkEventFunc func;
gpointer data;
};
typedef struct _GdkThreadsDispatch GdkThreadsDispatch;
struct _GdkThreadsDispatch
{
GSourceFunc func;
gpointer data;
GDestroyNotify destroy;
};
/* Private variable declarations
*/
static int gdk_initialized = 0; /* 1 if the library is initialized,
* 0 otherwise.
*/
static gchar *gdk_progclass = NULL;
static GMutex gdk_threads_mutex;
static GCallback gdk_threads_lock = NULL;
static GCallback gdk_threads_unlock = NULL;
#ifdef G_ENABLE_DEBUG
static const GDebugKey gdk_debug_keys[] = {
{"events", GDK_DEBUG_EVENTS},
{"misc", GDK_DEBUG_MISC},
{"dnd", GDK_DEBUG_DND},
{"xim", GDK_DEBUG_XIM},
{"nograbs", GDK_DEBUG_NOGRABS},
{"input", GDK_DEBUG_INPUT},
{"cursor", GDK_DEBUG_CURSOR},
{"multihead", GDK_DEBUG_MULTIHEAD},
{"xinerama", GDK_DEBUG_XINERAMA},
{"draw", GDK_DEBUG_DRAW},
{"eventloop", GDK_DEBUG_EVENTLOOP},
{"frames", GDK_DEBUG_FRAMES},
{"settings", GDK_DEBUG_SETTINGS}
};
static gboolean
gdk_arg_debug_cb (const char *key, const char *value, gpointer user_data, GError **error)
{
guint debug_value = g_parse_debug_string (value,
(GDebugKey *) gdk_debug_keys,
G_N_ELEMENTS (gdk_debug_keys));
if (debug_value == 0 && value != NULL && strcmp (value, "") != 0)
{
g_set_error (error,
G_OPTION_ERROR, G_OPTION_ERROR_FAILED,
_("Error parsing option --gdk-debug"));
return FALSE;
}
_gdk_debug_flags |= debug_value;
return TRUE;
}
static gboolean
gdk_arg_no_debug_cb (const char *key, const char *value, gpointer user_data, GError **error)
{
guint debug_value = g_parse_debug_string (value,
(GDebugKey *) gdk_debug_keys,
G_N_ELEMENTS (gdk_debug_keys));
if (debug_value == 0 && value != NULL && strcmp (value, "") != 0)
{
g_set_error (error,
G_OPTION_ERROR, G_OPTION_ERROR_FAILED,
_("Error parsing option --gdk-no-debug"));
return FALSE;
}
_gdk_debug_flags &= ~debug_value;
return TRUE;
}
#endif /* G_ENABLE_DEBUG */
static gboolean
gdk_arg_class_cb (const char *key, const char *value, gpointer user_data, GError **error)
{
gdk_set_program_class (value);
return TRUE;
}
static gboolean
gdk_arg_name_cb (const char *key, const char *value, gpointer user_data, GError **error)
{
g_set_prgname (value);
return TRUE;
}
static const GOptionEntry gdk_args[] = {
{ "class", 0, 0, G_OPTION_ARG_CALLBACK, gdk_arg_class_cb,
/* Description of --class=CLASS in --help output */ N_("Program class as used by the window manager"),
/* Placeholder in --class=CLASS in --help output */ N_("CLASS") },
{ "name", 0, 0, G_OPTION_ARG_CALLBACK, gdk_arg_name_cb,
/* Description of --name=NAME in --help output */ N_("Program name as used by the window manager"),
/* Placeholder in --name=NAME in --help output */ N_("NAME") },
{ "display", 0, G_OPTION_FLAG_IN_MAIN, G_OPTION_ARG_STRING, &_gdk_display_name,
/* Description of --display=DISPLAY in --help output */ N_("X display to use"),
/* Placeholder in --display=DISPLAY in --help output */ N_("DISPLAY") },
#ifdef G_ENABLE_DEBUG
{ "gdk-debug", 0, 0, G_OPTION_ARG_CALLBACK, gdk_arg_debug_cb,
/* Description of --gdk-debug=FLAGS in --help output */ N_("GDK debugging flags to set"),
/* Placeholder in --gdk-debug=FLAGS in --help output */ N_("FLAGS") },
{ "gdk-no-debug", 0, 0, G_OPTION_ARG_CALLBACK, gdk_arg_no_debug_cb,
/* Description of --gdk-no-debug=FLAGS in --help output */ N_("GDK debugging flags to unset"),
/* Placeholder in --gdk-no-debug=FLAGS in --help output */ N_("FLAGS") },
#endif
{ NULL }
};
/**
* gdk_add_option_entries_libgtk_only:
* @group: An option group.
*
* Appends gdk option entries to the passed in option group. This is
* not public API and must not be used by applications.
*/
void
gdk_add_option_entries_libgtk_only (GOptionGroup *group)
{
g_option_group_add_entries (group, gdk_args);
}
void
gdk_pre_parse_libgtk_only (void)
{
const char *rendering_mode;
gdk_initialized = TRUE;
/* We set the fallback program class here, rather than lazily in
* gdk_get_program_class, since we don't want -name to override it.
*/
gdk_progclass = g_strdup (g_get_prgname ());
if (gdk_progclass && gdk_progclass[0])
gdk_progclass[0] = g_ascii_toupper (gdk_progclass[0]);
#ifdef G_ENABLE_DEBUG
{
gchar *debug_string = getenv("GDK_DEBUG");
if (debug_string != NULL)
_gdk_debug_flags = g_parse_debug_string (debug_string,
(GDebugKey *) gdk_debug_keys,
G_N_ELEMENTS (gdk_debug_keys));
}
#endif /* G_ENABLE_DEBUG */
if (getenv ("GDK_NATIVE_WINDOWS"))
{
g_warning ("The GDK_NATIVE_WINDOWS environment variable is not supported in GTK3.\n"
"See the documentation for gdk_window_ensure_native() on how to get native windows.");
g_unsetenv ("GDK_NATIVE_WINDOWS");
}
rendering_mode = g_getenv ("GDK_RENDERING");
if (rendering_mode)
{
if (g_str_equal (rendering_mode, "similar"))
_gdk_rendering_mode = GDK_RENDERING_MODE_SIMILAR;
else if (g_str_equal (rendering_mode, "image"))
_gdk_rendering_mode = GDK_RENDERING_MODE_IMAGE;
else if (g_str_equal (rendering_mode, "recording"))
_gdk_rendering_mode = GDK_RENDERING_MODE_RECORDING;
}
}
/**
* gdk_parse_args:
* @argc: the number of command line arguments.
* @argv: (inout) (array length=argc): the array of command line arguments.
*
* Parse command line arguments, and store for future
* use by calls to gdk_display_open().
*
* Any arguments used by GDK are removed from the array and @argc and @argv are
* updated accordingly.
*
* You shouldnt call this function explicitly if you are using
* gtk_init(), gtk_init_check(), gdk_init(), or gdk_init_check().
*
* Since: 2.2
**/
void
gdk_parse_args (int *argc,
char ***argv)
{
GOptionContext *option_context;
GOptionGroup *option_group;
GError *error = NULL;
if (gdk_initialized)
return;
gdk_pre_parse_libgtk_only ();
option_context = g_option_context_new (NULL);
g_option_context_set_ignore_unknown_options (option_context, TRUE);
g_option_context_set_help_enabled (option_context, FALSE);
option_group = g_option_group_new (NULL, NULL, NULL, NULL, NULL);
g_option_context_set_main_group (option_context, option_group);
g_option_group_add_entries (option_group, gdk_args);
if (!g_option_context_parse (option_context, argc, argv, &error))
{
g_warning ("%s", error->message);
g_error_free (error);
}
g_option_context_free (option_context);
GDK_NOTE (MISC, g_message ("progname: \"%s\"", g_get_prgname ()));
}
/**
* gdk_get_display:
*
* Gets the name of the display, which usually comes from the
* `DISPLAY` environment variable or the
* `--display` command line option.
*
* Returns: the name of the display.
*
* Deprecated: 3.8: Call gdk_display_get_name (gdk_display_get_default ()))
* instead.
*/
gchar *
gdk_get_display (void)
{
return g_strdup (gdk_display_get_name (gdk_display_get_default ()));
}
/**
* gdk_get_display_arg_name:
*
* Gets the display name specified in the command line arguments passed
* to gdk_init() or gdk_parse_args(), if any.
*
* Returns: (nullable): the display name, if specified explicitly,
* otherwise %NULL this string is owned by GTK+ and must not be
* modified or freed.
*
* Since: 2.2
*/
const gchar *
gdk_get_display_arg_name (void)
{
if (!_gdk_display_arg_name)
_gdk_display_arg_name = g_strdup (_gdk_display_name);
return _gdk_display_arg_name;
}
/**
* gdk_display_open_default_libgtk_only:
*
* Opens the default display specified by command line arguments or
* environment variables, sets it as the default display, and returns
* it. gdk_parse_args() must have been called first. If the default
* display has previously been set, simply returns that. An internal
* function that should not be used by applications.
*
* Returns: (nullable) (transfer none): the default display, if it
* could be opened, otherwise %NULL.
**/
GdkDisplay *
gdk_display_open_default_libgtk_only (void)
{
GdkDisplay *display;
g_return_val_if_fail (gdk_initialized, NULL);
display = gdk_display_get_default ();
if (display)
return display;
display = gdk_display_open (gdk_get_display_arg_name ());
return display;
}
/**
* gdk_init_check:
* @argc: (inout): the number of command line arguments.
* @argv: (array length=argc) (inout): the array of command line arguments.
*
* Initializes the GDK library and connects to the windowing system,
* returning %TRUE on success.
*
* Any arguments used by GDK are removed from the array and @argc and @argv
* are updated accordingly.
*
* GTK+ initializes GDK in gtk_init() and so this function is not usually
* needed by GTK+ applications.
*
* Returns: %TRUE if initialization succeeded.
*/
gboolean
gdk_init_check (int *argc,
char ***argv)
{
gdk_parse_args (argc, argv);
return gdk_display_open_default_libgtk_only () != NULL;
}
/**
* gdk_init:
* @argc: (inout): the number of command line arguments.
* @argv: (array length=argc) (inout): the array of command line arguments.
*
* Initializes the GDK library and connects to the windowing system.
* If initialization fails, a warning message is output and the application
* terminates with a call to `exit(1)`.
*
* Any arguments used by GDK are removed from the array and @argc and @argv
* are updated accordingly.
*
* GTK+ initializes GDK in gtk_init() and so this function is not usually
* needed by GTK+ applications.
*/
void
gdk_init (int *argc, char ***argv)
{
if (!gdk_init_check (argc, argv))
{
const char *display_name = gdk_get_display_arg_name ();
g_warning ("cannot open display: %s", display_name ? display_name : "");
exit(1);
}
}
/**
* SECTION:threads
* @Short_description: Functions for using GDK in multi-threaded programs
* @Title: Threads
*
* For thread safety, GDK relies on the thread primitives in GLib,
* and on the thread-safe GLib main loop.
*
* GLib is completely thread safe (all global data is automatically
* locked), but individual data structure instances are not automatically
* locked for performance reasons. So e.g. you must coordinate
* accesses to the same #GHashTable from multiple threads.
*
* GTK+, however, is not thread safe. You should only use GTK+ and GDK
* from the thread gtk_init() and gtk_main() were called on.
* This is usually referred to as the “main thread”.
*
* Signals on GTK+ and GDK types, as well as non-signal callbacks, are
* emitted in the main thread.
*
* You can schedule work in the main thread safely from other threads
* by using gdk_threads_add_idle() and gdk_threads_add_timeout():
*
* |[<!-- language="C" -->
* static void
* worker_thread (void)
* {
* ExpensiveData *expensive_data = do_expensive_computation ();
*
* gdk_threads_add_idle (got_value, expensive_data);
* }
*
* static gboolean
* got_value (gpointer user_data)
* {
* ExpensiveData *expensive_data = user_data;
*
* my_app->expensive_data = expensive_data;
* gtk_button_set_sensitive (my_app->button, TRUE);
* gtk_button_set_label (my_app->button, expensive_data->result_label);
*
* return G_SOURCE_REMOVE;
* }
* ]|
*
* You should use gdk_threads_add_idle() and gdk_threads_add_timeout()
* instead of g_idle_add() and g_timeout_add() since libraries not under
* your control might be using the deprecated GDK locking mechanism.
* If you are sure that none of the code in your application and libraries
* use the deprecated gdk_threads_enter() or gdk_threads_leave() methods,
* then you can safely use g_idle_add() and g_timeout_add().
*
* For more information on this "worker thread" pattern, you should
* also look at #GTask, which gives you high-level tools to perform
* expensive tasks from worker threads, and will handle thread
* management for you.
*/
/**
* gdk_threads_enter:
*
* This function marks the beginning of a critical section in which
* GDK and GTK+ functions can be called safely and without causing race
* conditions. Only one thread at a time can be in such a critial
* section.
*
* Deprecated:3.6: All GDK and GTK+ calls should be made from the main
* thread
*/
void
gdk_threads_enter (void)
{
if (gdk_threads_lock)
(*gdk_threads_lock) ();
}
/**
* gdk_threads_leave:
*
* Leaves a critical region begun with gdk_threads_enter().
*
* Deprecated:3.6: All GDK and GTK+ calls should be made from the main
* thread
*/
void
gdk_threads_leave (void)
{
if (gdk_threads_unlock)
(*gdk_threads_unlock) ();
}
static void
gdk_threads_impl_lock (void)
{
g_mutex_lock (&gdk_threads_mutex);
}
static void
gdk_threads_impl_unlock (void)
{
/* we need a trylock() here because trying to unlock a mutex
* that hasn't been locked yet is:
*
* a) not portable
* b) fail on GLib ≥ 2.41
*
* trylock() will either succeed because nothing is holding the
* GDK mutex, and will be unlocked right afterwards; or it's
* going to fail because the mutex is locked already, in which
* case we unlock it as expected.
*
* this is needed in the case somebody called gdk_threads_init()
* without calling gdk_threads_enter() before calling gtk_main().
* in theory, we could just say that this is undefined behaviour,
* but our documentation has always been *less* than explicit as
* to what the behaviour should actually be.
*
* see bug: https://bugzilla.gnome.org/show_bug.cgi?id=735428
*/
g_mutex_trylock (&gdk_threads_mutex);
g_mutex_unlock (&gdk_threads_mutex);
}
/**
* gdk_threads_init:
*
* Initializes GDK so that it can be used from multiple threads
* in conjunction with gdk_threads_enter() and gdk_threads_leave().
*
* This call must be made before any use of the main loop from
* GTK+; to be safe, call it before gtk_init().
*
* Deprecated:3.6: All GDK and GTK+ calls should be made from the main
* thread
*/
void
gdk_threads_init (void)
{
if (!gdk_threads_lock)
gdk_threads_lock = gdk_threads_impl_lock;
if (!gdk_threads_unlock)
gdk_threads_unlock = gdk_threads_impl_unlock;
}
/**
* gdk_threads_set_lock_functions: (skip)
* @enter_fn: function called to guard GDK
* @leave_fn: function called to release the guard
*
* Allows the application to replace the standard method that
* GDK uses to protect its data structures. Normally, GDK
* creates a single #GMutex that is locked by gdk_threads_enter(),
* and released by gdk_threads_leave(); using this function an
* application provides, instead, a function @enter_fn that is
* called by gdk_threads_enter() and a function @leave_fn that is
* called by gdk_threads_leave().
*
* The functions must provide at least same locking functionality
* as the default implementation, but can also do extra application
* specific processing.
*
* As an example, consider an application that has its own recursive
* lock that when held, holds the GTK+ lock as well. When GTK+ unlocks
* the GTK+ lock when entering a recursive main loop, the application
* must temporarily release its lock as well.
*
* Most threaded GTK+ apps wont need to use this method.
*
* This method must be called before gdk_threads_init(), and cannot
* be called multiple times.
*
* Deprecated:3.6: All GDK and GTK+ calls should be made from the main
* thread
*
* Since: 2.4
**/
void
gdk_threads_set_lock_functions (GCallback enter_fn,
GCallback leave_fn)
{
g_return_if_fail (gdk_threads_lock == NULL &&
gdk_threads_unlock == NULL);
gdk_threads_lock = enter_fn;
gdk_threads_unlock = leave_fn;
}
static gboolean
gdk_threads_dispatch (gpointer data)
{
GdkThreadsDispatch *dispatch = data;
gboolean ret = FALSE;
gdk_threads_enter ();
if (!g_source_is_destroyed (g_main_current_source ()))
ret = dispatch->func (dispatch->data);
gdk_threads_leave ();
return ret;
}
static void
gdk_threads_dispatch_free (gpointer data)
{
GdkThreadsDispatch *dispatch = data;
if (dispatch->destroy && dispatch->data)
dispatch->destroy (dispatch->data);
g_slice_free (GdkThreadsDispatch, data);
}
/**
* gdk_threads_add_idle_full: (rename-to gdk_threads_add_idle)
* @priority: the priority of the idle source. Typically this will be in the
* range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE
* @function: function to call
* @data: data to pass to @function
* @notify: (allow-none): function to call when the idle is removed, or %NULL
*
* Adds a function to be called whenever there are no higher priority
* events pending. If the function returns %FALSE it is automatically
* removed from the list of event sources and will not be called again.
*
* This variant of g_idle_add_full() calls @function with the GDK lock
* held. It can be thought of a MT-safe version for GTK+ widgets for the
* following use case, where you have to worry about idle_callback()
* running in thread A and accessing @self after it has been finalized
* in thread B:
*
* |[<!-- language="C" -->
* static gboolean
* idle_callback (gpointer data)
* {
* // gdk_threads_enter(); would be needed for g_idle_add()
*
* SomeWidget *self = data;
* // do stuff with self
*
* self->idle_id = 0;
*
* // gdk_threads_leave(); would be needed for g_idle_add()
* return FALSE;
* }
*
* static void
* some_widget_do_stuff_later (SomeWidget *self)
* {
* self->idle_id = gdk_threads_add_idle (idle_callback, self)
* // using g_idle_add() here would require thread protection in the callback
* }
*
* static void
* some_widget_finalize (GObject *object)
* {
* SomeWidget *self = SOME_WIDGET (object);
* if (self->idle_id)
* g_source_remove (self->idle_id);
* G_OBJECT_CLASS (parent_class)->finalize (object);
* }
* ]|
*
* Returns: the ID (greater than 0) of the event source.
*
* Since: 2.12
*/
guint
gdk_threads_add_idle_full (gint priority,
GSourceFunc function,
gpointer data,
GDestroyNotify notify)
{
GdkThreadsDispatch *dispatch;
g_return_val_if_fail (function != NULL, 0);
dispatch = g_slice_new (GdkThreadsDispatch);
dispatch->func = function;
dispatch->data = data;
dispatch->destroy = notify;
return g_idle_add_full (priority,
gdk_threads_dispatch,
dispatch,
gdk_threads_dispatch_free);
}
/**
* gdk_threads_add_idle: (skip)
* @function: function to call
* @data: data to pass to @function
*
* A wrapper for the common usage of gdk_threads_add_idle_full()
* assigning the default priority, #G_PRIORITY_DEFAULT_IDLE.
*
* See gdk_threads_add_idle_full().
*
* Returns: the ID (greater than 0) of the event source.
*
* Since: 2.12
*/
guint
gdk_threads_add_idle (GSourceFunc function,
gpointer data)
{
return gdk_threads_add_idle_full (G_PRIORITY_DEFAULT_IDLE,
function, data, NULL);
}
/**
* gdk_threads_add_timeout_full: (rename-to gdk_threads_add_timeout)
* @priority: the priority of the timeout source. Typically this will be in the
* range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE.
* @interval: the time between calls to the function, in milliseconds
* (1/1000ths of a second)
* @function: function to call
* @data: data to pass to @function
* @notify: (allow-none): function to call when the timeout is removed, or %NULL
*
* Sets a function to be called at regular intervals holding the GDK lock,
* with the given priority. The function is called repeatedly until it
* returns %FALSE, at which point the timeout is automatically destroyed
* and the function will not be called again. The @notify function is
* called when the timeout is destroyed. The first call to the
* function will be at the end of the first @interval.
*
* Note that timeout functions may be delayed, due to the processing of other
* event sources. Thus they should not be relied on for precise timing.
* After each call to the timeout function, the time of the next
* timeout is recalculated based on the current time and the given interval
* (it does not try to “catch up” time lost in delays).
*
* This variant of g_timeout_add_full() can be thought of a MT-safe version
* for GTK+ widgets for the following use case:
*
* |[<!-- language="C" -->
* static gboolean timeout_callback (gpointer data)
* {
* SomeWidget *self = data;
*
* // do stuff with self
*
* self->timeout_id = 0;
*
* return G_SOURCE_REMOVE;
* }
*
* static void some_widget_do_stuff_later (SomeWidget *self)
* {
* self->timeout_id = g_timeout_add (timeout_callback, self)
* }
*
* static void some_widget_finalize (GObject *object)
* {
* SomeWidget *self = SOME_WIDGET (object);
*
* if (self->timeout_id)
* g_source_remove (self->timeout_id);
*
* G_OBJECT_CLASS (parent_class)->finalize (object);
* }
* ]|
*
* Returns: the ID (greater than 0) of the event source.
*
* Since: 2.12
*/
guint
gdk_threads_add_timeout_full (gint priority,
guint interval,
GSourceFunc function,
gpointer data,
GDestroyNotify notify)
{
GdkThreadsDispatch *dispatch;
g_return_val_if_fail (function != NULL, 0);
dispatch = g_slice_new (GdkThreadsDispatch);
dispatch->func = function;
dispatch->data = data;
dispatch->destroy = notify;
return g_timeout_add_full (priority,
interval,
gdk_threads_dispatch,
dispatch,
gdk_threads_dispatch_free);
}
/**
* gdk_threads_add_timeout: (skip)
* @interval: the time between calls to the function, in milliseconds
* (1/1000ths of a second)
* @function: function to call
* @data: data to pass to @function
*
* A wrapper for the common usage of gdk_threads_add_timeout_full()
* assigning the default priority, #G_PRIORITY_DEFAULT.
*
* See gdk_threads_add_timeout_full().
*
* Returns: the ID (greater than 0) of the event source.
*
* Since: 2.12
*/
guint
gdk_threads_add_timeout (guint interval,
GSourceFunc function,
gpointer data)
{
return gdk_threads_add_timeout_full (G_PRIORITY_DEFAULT,
interval, function, data, NULL);
}
/**
* gdk_threads_add_timeout_seconds_full: (rename-to gdk_threads_add_timeout_seconds)
* @priority: the priority of the timeout source. Typically this will be in the
* range between #G_PRIORITY_DEFAULT_IDLE and #G_PRIORITY_HIGH_IDLE.
* @interval: the time between calls to the function, in seconds
* @function: function to call
* @data: data to pass to @function
* @notify: (allow-none): function to call when the timeout is removed, or %NULL
*
* A variant of gdk_threads_add_timeout_full() with second-granularity.
* See g_timeout_add_seconds_full() for a discussion of why it is
* a good idea to use this function if you dont need finer granularity.
*
* Returns: the ID (greater than 0) of the event source.
*
* Since: 2.14
*/
guint
gdk_threads_add_timeout_seconds_full (gint priority,
guint interval,
GSourceFunc function,
gpointer data,
GDestroyNotify notify)
{
GdkThreadsDispatch *dispatch;
g_return_val_if_fail (function != NULL, 0);
dispatch = g_slice_new (GdkThreadsDispatch);
dispatch->func = function;
dispatch->data = data;
dispatch->destroy = notify;
return g_timeout_add_seconds_full (priority,
interval,
gdk_threads_dispatch,
dispatch,
gdk_threads_dispatch_free);
}
/**
* gdk_threads_add_timeout_seconds: (skip)
* @interval: the time between calls to the function, in seconds
* @function: function to call
* @data: data to pass to @function
*
* A wrapper for the common usage of gdk_threads_add_timeout_seconds_full()
* assigning the default priority, #G_PRIORITY_DEFAULT.
*
* For details, see gdk_threads_add_timeout_full().
*
* Returns: the ID (greater than 0) of the event source.
*
* Since: 2.14
*/
guint
gdk_threads_add_timeout_seconds (guint interval,
GSourceFunc function,
gpointer data)
{
return gdk_threads_add_timeout_seconds_full (G_PRIORITY_DEFAULT,
interval, function, data, NULL);
}
/**
* gdk_get_program_class:
*
* Gets the program class. Unless the program class has explicitly
* been set with gdk_set_program_class() or with the `--class`
* commandline option, the default value is the program name (determined
* with g_get_prgname()) with the first character converted to uppercase.
*
* Returns: the program class.
*/
const char *
gdk_get_program_class (void)
{
return gdk_progclass;
}
/**
* gdk_set_program_class:
* @program_class: a string.
*
* Sets the program class. The X11 backend uses the program class to set
* the class name part of the `WM_CLASS` property on
* toplevel windows; see the ICCCM.
*/
void
gdk_set_program_class (const char *program_class)
{
g_free (gdk_progclass);
gdk_progclass = g_strdup (program_class);
}
/**
* gdk_disable_multidevice:
*
* Disables multidevice support in GDK. This call must happen prior
* to gdk_display_open(), gtk_init(), gtk_init_with_args() or
* gtk_init_check() in order to take effect.
*
* Most common GTK+ applications wont ever need to call this. Only
* applications that do mixed GDK/Xlib calls could want to disable
* multidevice support if such Xlib code deals with input devices in
* any way and doesnt observe the presence of XInput 2.
*
* Since: 3.0
*/
void
gdk_disable_multidevice (void)
{
if (gdk_initialized)
return;
_gdk_disable_multidevice = TRUE;
}