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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>
326 lines
15 KiB
C
326 lines
15 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_OUTPUT_STREAM_H__
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#define __G_OUTPUT_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_OUTPUT_STREAM (g_output_stream_get_type ())
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#define G_OUTPUT_STREAM(o) (G_TYPE_CHECK_INSTANCE_CAST ((o), G_TYPE_OUTPUT_STREAM, GOutputStream))
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#define G_OUTPUT_STREAM_CLASS(k) (G_TYPE_CHECK_CLASS_CAST((k), G_TYPE_OUTPUT_STREAM, GOutputStreamClass))
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#define G_IS_OUTPUT_STREAM(o) (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_TYPE_OUTPUT_STREAM))
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#define G_IS_OUTPUT_STREAM_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE ((k), G_TYPE_OUTPUT_STREAM))
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#define G_OUTPUT_STREAM_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), G_TYPE_OUTPUT_STREAM, GOutputStreamClass))
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typedef struct _GOutputStreamClass GOutputStreamClass;
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typedef struct _GOutputStreamPrivate GOutputStreamPrivate;
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struct _GOutputStream
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{
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GObject parent_instance;
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/*< private >*/
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GOutputStreamPrivate *priv;
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};
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struct _GOutputStreamClass
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{
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GObjectClass parent_class;
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/* Sync ops: */
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gssize (* write_fn) (GOutputStream *stream,
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const 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 (* splice) (GOutputStream *stream,
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GInputStream *source,
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GOutputStreamSpliceFlags flags,
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GCancellable *cancellable,
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GError **error);
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gboolean (* flush) (GOutputStream *stream,
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GCancellable *cancellable,
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GError **error);
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gboolean (* close_fn) (GOutputStream *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 (* write_async) (GOutputStream *stream,
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const 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 (* write_finish) (GOutputStream *stream,
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GAsyncResult *result,
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GError **error);
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void (* splice_async) (GOutputStream *stream,
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GInputStream *source,
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GOutputStreamSpliceFlags flags,
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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 (* splice_finish) (GOutputStream *stream,
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GAsyncResult *result,
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GError **error);
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void (* flush_async) (GOutputStream *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 (* flush_finish) (GOutputStream *stream,
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GAsyncResult *result,
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GError **error);
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void (* close_async) (GOutputStream *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) (GOutputStream *stream,
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GAsyncResult *result,
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GError **error);
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gboolean (* writev_fn) (GOutputStream *stream,
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const GOutputVector *vectors,
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gsize n_vectors,
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gsize *bytes_written,
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GCancellable *cancellable,
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GError **error);
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void (* writev_async) (GOutputStream *stream,
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const GOutputVector *vectors,
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gsize n_vectors,
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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 (* writev_finish) (GOutputStream *stream,
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GAsyncResult *result,
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gsize *bytes_written,
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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_reserved4) (void);
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void (*_g_reserved5) (void);
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void (*_g_reserved6) (void);
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void (*_g_reserved7) (void);
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void (*_g_reserved8) (void);
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};
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GIO_AVAILABLE_IN_ALL
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GType g_output_stream_get_type (void);
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GIO_AVAILABLE_IN_ALL
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gssize g_output_stream_write (GOutputStream *stream,
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const 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_output_stream_write_all (GOutputStream *stream,
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const void *buffer,
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gsize count,
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gsize *bytes_written,
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GCancellable *cancellable,
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GError **error);
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GIO_AVAILABLE_IN_2_60
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gboolean g_output_stream_writev (GOutputStream *stream,
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const GOutputVector *vectors,
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gsize n_vectors,
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gsize *bytes_written,
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GCancellable *cancellable,
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GError **error);
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GIO_AVAILABLE_IN_2_60
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gboolean g_output_stream_writev_all (GOutputStream *stream,
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GOutputVector *vectors,
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gsize n_vectors,
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gsize *bytes_written,
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GCancellable *cancellable,
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GError **error);
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GIO_AVAILABLE_IN_2_40
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gboolean g_output_stream_printf (GOutputStream *stream,
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gsize *bytes_written,
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GCancellable *cancellable,
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GError **error,
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const gchar *format,
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...) G_GNUC_PRINTF (5, 6);
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GIO_AVAILABLE_IN_2_40
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gboolean g_output_stream_vprintf (GOutputStream *stream,
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gsize *bytes_written,
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GCancellable *cancellable,
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GError **error,
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const gchar *format,
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va_list args) G_GNUC_PRINTF (5, 0);
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GIO_AVAILABLE_IN_2_34
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gssize g_output_stream_write_bytes (GOutputStream *stream,
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GBytes *bytes,
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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_output_stream_splice (GOutputStream *stream,
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GInputStream *source,
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GOutputStreamSpliceFlags flags,
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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_output_stream_flush (GOutputStream *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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gboolean g_output_stream_close (GOutputStream *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_output_stream_write_async (GOutputStream *stream,
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const 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_output_stream_write_finish (GOutputStream *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_output_stream_write_all_async (GOutputStream *stream,
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const 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_output_stream_write_all_finish (GOutputStream *stream,
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GAsyncResult *result,
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gsize *bytes_written,
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GError **error);
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GIO_AVAILABLE_IN_2_60
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void g_output_stream_writev_async (GOutputStream *stream,
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const GOutputVector *vectors,
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gsize n_vectors,
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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_60
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gboolean g_output_stream_writev_finish (GOutputStream *stream,
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GAsyncResult *result,
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gsize *bytes_written,
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GError **error);
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GIO_AVAILABLE_IN_2_60
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void g_output_stream_writev_all_async (GOutputStream *stream,
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GOutputVector *vectors,
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gsize n_vectors,
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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_60
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gboolean g_output_stream_writev_all_finish (GOutputStream *stream,
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GAsyncResult *result,
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gsize *bytes_written,
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GError **error);
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GIO_AVAILABLE_IN_2_34
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void g_output_stream_write_bytes_async (GOutputStream *stream,
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GBytes *bytes,
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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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gssize g_output_stream_write_bytes_finish (GOutputStream *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_output_stream_splice_async (GOutputStream *stream,
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GInputStream *source,
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GOutputStreamSpliceFlags flags,
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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_output_stream_splice_finish (GOutputStream *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_output_stream_flush_async (GOutputStream *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_output_stream_flush_finish (GOutputStream *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_output_stream_close_async (GOutputStream *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_output_stream_close_finish (GOutputStream *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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gboolean g_output_stream_is_closed (GOutputStream *stream);
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GIO_AVAILABLE_IN_ALL
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gboolean g_output_stream_is_closing (GOutputStream *stream);
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GIO_AVAILABLE_IN_ALL
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gboolean g_output_stream_has_pending (GOutputStream *stream);
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GIO_AVAILABLE_IN_ALL
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gboolean g_output_stream_set_pending (GOutputStream *stream,
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GError **error);
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GIO_AVAILABLE_IN_ALL
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void g_output_stream_clear_pending (GOutputStream *stream);
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G_END_DECLS
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#endif /* __G_OUTPUT_STREAM_H__ */
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