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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>
131 lines
5.0 KiB
C
131 lines
5.0 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: Christian Kellner <gicmo@gnome.org>
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*/
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#ifndef __G_BUFFERED_INPUT_STREAM_H__
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#define __G_BUFFERED_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/gfilterinputstream.h>
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G_BEGIN_DECLS
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#define G_TYPE_BUFFERED_INPUT_STREAM (g_buffered_input_stream_get_type ())
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#define G_BUFFERED_INPUT_STREAM(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_BUFFERED_INPUT_STREAM, GBufferedInputStream))
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#define G_BUFFERED_INPUT_STREAM_CLASS(k) (G_TYPE_CHECK_CLASS_CAST((k), G_TYPE_BUFFERED_INPUT_STREAM, GBufferedInputStreamClass))
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#define G_IS_BUFFERED_INPUT_STREAM(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_TYPE_BUFFERED_INPUT_STREAM))
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#define G_IS_BUFFERED_INPUT_STREAM_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), G_TYPE_BUFFERED_INPUT_STREAM))
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#define G_BUFFERED_INPUT_STREAM_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), G_TYPE_BUFFERED_INPUT_STREAM, GBufferedInputStreamClass))
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typedef struct _GBufferedInputStreamClass GBufferedInputStreamClass;
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typedef struct _GBufferedInputStreamPrivate GBufferedInputStreamPrivate;
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struct _GBufferedInputStream
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{
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GFilterInputStream parent_instance;
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/*< private >*/
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GBufferedInputStreamPrivate *priv;
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};
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struct _GBufferedInputStreamClass
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{
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GFilterInputStreamClass parent_class;
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gssize (* fill) (GBufferedInputStream *stream,
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gssize count,
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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 (* fill_async) (GBufferedInputStream *stream,
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gssize 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 (* fill_finish) (GBufferedInputStream *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_buffered_input_stream_get_type (void);
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GIO_AVAILABLE_IN_ALL
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GInputStream* g_buffered_input_stream_new (GInputStream *base_stream);
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GIO_AVAILABLE_IN_ALL
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GInputStream* g_buffered_input_stream_new_sized (GInputStream *base_stream,
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gsize size);
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GIO_AVAILABLE_IN_ALL
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gsize g_buffered_input_stream_get_buffer_size (GBufferedInputStream *stream);
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GIO_AVAILABLE_IN_ALL
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void g_buffered_input_stream_set_buffer_size (GBufferedInputStream *stream,
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gsize size);
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GIO_AVAILABLE_IN_ALL
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gsize g_buffered_input_stream_get_available (GBufferedInputStream *stream);
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GIO_AVAILABLE_IN_ALL
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gsize g_buffered_input_stream_peek (GBufferedInputStream *stream,
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void *buffer,
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gsize offset,
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gsize count);
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GIO_AVAILABLE_IN_ALL
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const void* g_buffered_input_stream_peek_buffer (GBufferedInputStream *stream,
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gsize *count);
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GIO_AVAILABLE_IN_ALL
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gssize g_buffered_input_stream_fill (GBufferedInputStream *stream,
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gssize 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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void g_buffered_input_stream_fill_async (GBufferedInputStream *stream,
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gssize 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_buffered_input_stream_fill_finish (GBufferedInputStream *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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int g_buffered_input_stream_read_byte (GBufferedInputStream *stream,
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GCancellable *cancellable,
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GError **error);
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G_END_DECLS
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#endif /* __G_BUFFERED_INPUT_STREAM_H__ */
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