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016829559e
g_type_ensure has a large comment saying _get_type shouldn't be marked with G_GNUC_CONST because it has side-effects on the first run, but it's OK if you consistently call g_type_ensure first. Unfortunately, this isn't accurate. GCC trunk (observed at r17-1725-ge259a182e1f100) now analyses points-to information more effectively and propagates its findings, so it sees the function modifies some global state, concludes that can't be possible (because of the const attribute), and deletes the stores. pure unfortunately is unsuitable for *_get_type too as it has a side-effect (writes to global memory). Mesa had a similar issue which I fixed recently [0]. glib and glibmm likely want the (not-yet-implemented) 'idempotent' attribute instead [1]. In fact, this exact problem is what motivated that request! :) ebassi mentions an alternative to the current setup as well, using atomics [2]. This problem has gone back many years but the compiler has finally fully outsmarted us here, so give in. [0] https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/42361 [1] https://gcc.gnu.org/PR32911 [2] https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4249#note_2583110 Fixes: https://gitlab.gnome.org/GNOME/glib/-/work_items/3984 Signed-off-by: Sam James <sam@gentoo.org>
126 lines
4.2 KiB
C
126 lines
4.2 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2009 Red Hat, Inc.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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* Author: Alexander Larsson <alexl@redhat.com>
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*/
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#ifndef __G_ASYNC_INITABLE_H__
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#define __G_ASYNC_INITABLE_H__
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#if !defined (__GIO_GIO_H_INSIDE__) && !defined (GIO_COMPILATION)
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#error "Only <gio/gio.h> can be included directly."
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#endif
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#include <gio/giotypes.h>
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#include <gio/ginitable.h>
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G_BEGIN_DECLS
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#define G_TYPE_ASYNC_INITABLE (g_async_initable_get_type ())
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#define G_ASYNC_INITABLE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), G_TYPE_ASYNC_INITABLE, GAsyncInitable))
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#define G_IS_ASYNC_INITABLE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), G_TYPE_ASYNC_INITABLE))
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#define G_ASYNC_INITABLE_GET_IFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), G_TYPE_ASYNC_INITABLE, GAsyncInitableIface))
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#define G_TYPE_IS_ASYNC_INITABLE(type) (g_type_is_a ((type), G_TYPE_ASYNC_INITABLE))
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typedef struct _GAsyncInitableIface GAsyncInitableIface;
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/**
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* GAsyncInitableIface:
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* @g_iface: The parent interface.
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* @init_async: Starts initialization of the object.
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* @init_finish: Finishes initialization of the object.
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*
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* Provides an interface for asynchronous initializing object such that
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* initialization may fail.
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*
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* Since: 2.22
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**/
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struct _GAsyncInitableIface
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{
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GTypeInterface g_iface;
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/* Virtual Table */
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void (* init_async) (GAsyncInitable *initable,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean (* init_finish) (GAsyncInitable *initable,
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GAsyncResult *res,
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GError **error);
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};
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GIO_AVAILABLE_IN_ALL
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GType g_async_initable_get_type (void);
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GIO_AVAILABLE_IN_ALL
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void g_async_initable_init_async (GAsyncInitable *initable,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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GIO_AVAILABLE_IN_ALL
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gboolean g_async_initable_init_finish (GAsyncInitable *initable,
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GAsyncResult *res,
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GError **error);
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GIO_AVAILABLE_IN_ALL
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void g_async_initable_new_async (GType object_type,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data,
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const gchar *first_property_name,
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...);
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G_GNUC_BEGIN_IGNORE_DEPRECATIONS
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GIO_DEPRECATED_IN_2_54_FOR(g_object_new_with_properties and g_async_initable_init_async)
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void g_async_initable_newv_async (GType object_type,
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guint n_parameters,
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GParameter *parameters,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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G_GNUC_END_IGNORE_DEPRECATIONS
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GIO_AVAILABLE_IN_ALL
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void g_async_initable_new_valist_async (GType object_type,
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const gchar *first_property_name,
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va_list var_args,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data);
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GIO_AVAILABLE_IN_ALL
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GObject *g_async_initable_new_finish (GAsyncInitable *initable,
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GAsyncResult *res,
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GError **error);
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G_END_DECLS
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#endif /* __G_ASYNC_INITABLE_H__ */
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