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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>
214 lines
8.9 KiB
C
214 lines
8.9 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2006-2007 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_INPUT_STREAM_H__
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#define __G_INPUT_STREAM_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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G_BEGIN_DECLS
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#define G_TYPE_INPUT_STREAM (g_input_stream_get_type ())
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#define G_INPUT_STREAM(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_INPUT_STREAM, GInputStream))
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#define G_INPUT_STREAM_CLASS(k) (G_TYPE_CHECK_CLASS_CAST((k), G_TYPE_INPUT_STREAM, GInputStreamClass))
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#define G_IS_INPUT_STREAM(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_TYPE_INPUT_STREAM))
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#define G_IS_INPUT_STREAM_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), G_TYPE_INPUT_STREAM))
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#define G_INPUT_STREAM_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), G_TYPE_INPUT_STREAM, GInputStreamClass))
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typedef struct _GInputStreamClass GInputStreamClass;
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typedef struct _GInputStreamPrivate GInputStreamPrivate;
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struct _GInputStream
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{
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GObject parent_instance;
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/*< private >*/
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GInputStreamPrivate *priv;
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};
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struct _GInputStreamClass
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{
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GObjectClass parent_class;
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/* Sync ops: */
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gssize (* read_fn) (GInputStream *stream,
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void *buffer,
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gsize count,
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GCancellable *cancellable,
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GError **error);
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gssize (* skip) (GInputStream *stream,
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gsize count,
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GCancellable *cancellable,
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GError **error);
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gboolean (* close_fn) (GInputStream *stream,
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GCancellable *cancellable,
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GError **error);
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/* Async ops: (optional in derived classes) */
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void (* read_async) (GInputStream *stream,
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void *buffer,
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gsize count,
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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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gssize (* read_finish) (GInputStream *stream,
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GAsyncResult *result,
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GError **error);
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void (* skip_async) (GInputStream *stream,
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gsize count,
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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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gssize (* skip_finish) (GInputStream *stream,
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GAsyncResult *result,
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GError **error);
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void (* close_async) (GInputStream *stream,
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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 (* close_finish) (GInputStream *stream,
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GAsyncResult *result,
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GError **error);
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/*< private >*/
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/* Padding for future expansion */
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void (*_g_reserved1) (void);
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void (*_g_reserved2) (void);
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void (*_g_reserved3) (void);
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void (*_g_reserved4) (void);
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void (*_g_reserved5) (void);
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};
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GIO_AVAILABLE_IN_ALL
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GType g_input_stream_get_type (void);
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GIO_AVAILABLE_IN_ALL
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gssize g_input_stream_read (GInputStream *stream,
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void *buffer,
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gsize count,
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GCancellable *cancellable,
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GError **error);
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GIO_AVAILABLE_IN_ALL
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gboolean g_input_stream_read_all (GInputStream *stream,
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void *buffer,
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gsize count,
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gsize *bytes_read,
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GCancellable *cancellable,
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GError **error);
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GIO_AVAILABLE_IN_2_34
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GBytes *g_input_stream_read_bytes (GInputStream *stream,
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gsize count,
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GCancellable *cancellable,
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GError **error);
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GIO_AVAILABLE_IN_ALL
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gssize g_input_stream_skip (GInputStream *stream,
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gsize count,
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GCancellable *cancellable,
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GError **error);
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GIO_AVAILABLE_IN_ALL
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gboolean g_input_stream_close (GInputStream *stream,
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GCancellable *cancellable,
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GError **error);
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GIO_AVAILABLE_IN_ALL
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void g_input_stream_read_async (GInputStream *stream,
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void *buffer,
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gsize count,
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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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gssize g_input_stream_read_finish (GInputStream *stream,
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GAsyncResult *result,
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GError **error);
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GIO_AVAILABLE_IN_2_44
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void g_input_stream_read_all_async (GInputStream *stream,
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void *buffer,
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gsize count,
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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_2_44
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gboolean g_input_stream_read_all_finish (GInputStream *stream,
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GAsyncResult *result,
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gsize *bytes_read,
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GError **error);
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GIO_AVAILABLE_IN_2_34
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void g_input_stream_read_bytes_async (GInputStream *stream,
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gsize count,
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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_2_34
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GBytes *g_input_stream_read_bytes_finish (GInputStream *stream,
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GAsyncResult *result,
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GError **error);
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GIO_AVAILABLE_IN_ALL
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void g_input_stream_skip_async (GInputStream *stream,
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gsize count,
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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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gssize g_input_stream_skip_finish (GInputStream *stream,
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GAsyncResult *result,
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GError **error);
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GIO_AVAILABLE_IN_ALL
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void g_input_stream_close_async (GInputStream *stream,
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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_input_stream_close_finish (GInputStream *stream,
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GAsyncResult *result,
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GError **error);
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/* For implementations: */
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GIO_AVAILABLE_IN_ALL
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gboolean g_input_stream_is_closed (GInputStream *stream);
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GIO_AVAILABLE_IN_ALL
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gboolean g_input_stream_has_pending (GInputStream *stream);
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GIO_AVAILABLE_IN_ALL
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gboolean g_input_stream_set_pending (GInputStream *stream,
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GError **error);
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GIO_AVAILABLE_IN_ALL
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void g_input_stream_clear_pending (GInputStream *stream);
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G_END_DECLS
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#endif /* __G_INPUT_STREAM_H__ */
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