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Merge branch 'th/gsignal-cleanup' into 'master'

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[th/gsignal-cleanup] minor changes to GSignal related code

See merge request GNOME/glib!1900
This commit is contained in:
Sebastian Dröge 2021-02-01 09:07:51 +00:00
commit c07f8a70dc
2 changed files with 31 additions and 22 deletions
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34
gobject/gsignal.c
View File

@ -1958,24 +1958,32 @@ g_signal_new_valist (const gchar *signal_name,
guint n_params,
va_list args)
{
/* Somewhat arbitrarily reserve 200 bytes. That should cover the majority
* of cases where n_params is small and still be small enough for what we
* want to put on the stack. */
GType param_types_stack[200 / sizeof (GType)];
GType *param_types_heap = NULL;
GType *param_types;
guint i;
guint signal_id;
param_types = param_types_stack;
if (n_params > 0)
{
param_types = g_new (GType, n_params);
if (G_UNLIKELY (n_params > G_N_ELEMENTS (param_types_stack)))
{
param_types_heap = g_new (GType, n_params);
param_types = param_types_heap;
}
for (i = 0; i < n_params; i++)
param_types[i] = va_arg (args, GType);
}
else
param_types = NULL;
signal_id = g_signal_newv (signal_name, itype, signal_flags,
class_closure, accumulator, accu_data, c_marshaller,
return_type, n_params, param_types);
g_free (param_types);
g_free (param_types_heap);
return signal_id;
}
@ -4004,6 +4012,7 @@ g_signal_accumulator_first_wins (GSignalInvocationHint *ihint,
* g_clear_signal_handler:
* @handler_id_ptr: A pointer to a handler ID (of type #gulong) of the handler to be disconnected.
* @instance: (type GObject.Object): The instance to remove the signal handler from.
* This pointer may be %NULL or invalid, if the handler ID is zero.
*
* Disconnects a handler from @instance so it will not be called during
* any future or currently ongoing emissions of the signal it has been
@ -4011,21 +4020,20 @@ g_signal_accumulator_first_wins (GSignalInvocationHint *ihint,
*
* If the handler ID is 0 then this function does nothing.
*
* A macro is also included that allows this function to be used without
* pointer casts.
* There is also a macro version of this function so that the code
* will be inlined.
*
* Since: 2.62
*/
#undef g_clear_signal_handler
void
g_clear_signal_handler (gulong *handler_id_ptr,
(g_clear_signal_handler) (gulong *handler_id_ptr,
gpointer instance)
{
g_return_if_fail (handler_id_ptr != NULL);
if (*handler_id_ptr != 0)
{
g_signal_handler_disconnect (instance, *handler_id_ptr);
*handler_id_ptr = 0;
}
#ifndef g_clear_signal_handler
#error g_clear_signal_handler() macro is not defined
#endif
g_clear_signal_handler (handler_id_ptr, instance);
}

9
gobject/gsignal.h
View File

@ -451,13 +451,14 @@ void g_clear_signal_handler (gulong *handler_id_ptr,
#define g_clear_signal_handler(handler_id_ptr, instance) \
G_STMT_START { \
G_STATIC_ASSERT (sizeof *(handler_id_ptr) == sizeof (gulong)); \
gulong _handler_id = *(handler_id_ptr); \
gpointer const _instance = (instance); \
gulong *const _handler_id_ptr = (handler_id_ptr); \
const gulong _handler_id = *_handler_id_ptr; \
\
if (_handler_id > 0) \
{ \
g_signal_handler_disconnect ((instance), _handler_id); \
*(handler_id_ptr) = 0; \
*_handler_id_ptr = 0; \
g_signal_handler_disconnect (_instance, _handler_id); \
} \
} G_STMT_END \
GLIB_AVAILABLE_MACRO_IN_2_62