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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>
100 lines
3.6 KiB
C
100 lines
3.6 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2010 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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#ifndef __G_POLLABLE_INPUT_STREAM_H__
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#define __G_POLLABLE_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/gio.h>
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G_BEGIN_DECLS
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#define G_TYPE_POLLABLE_INPUT_STREAM (g_pollable_input_stream_get_type ())
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#define G_POLLABLE_INPUT_STREAM(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), G_TYPE_POLLABLE_INPUT_STREAM, GPollableInputStream))
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#define G_IS_POLLABLE_INPUT_STREAM(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), G_TYPE_POLLABLE_INPUT_STREAM))
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#define G_POLLABLE_INPUT_STREAM_GET_INTERFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), G_TYPE_POLLABLE_INPUT_STREAM, GPollableInputStreamInterface))
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typedef struct _GPollableInputStreamInterface GPollableInputStreamInterface;
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/**
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* GPollableInputStreamInterface:
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* @g_iface: The parent interface.
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* @can_poll: Checks if the #GPollableInputStream instance is actually pollable
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* @is_readable: Checks if the stream is readable
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* @create_source: Creates a #GSource to poll the stream
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* @read_nonblocking: Does a non-blocking read or returns
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* %G_IO_ERROR_WOULD_BLOCK
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*
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* The interface for pollable input streams.
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*
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* The default implementation of @can_poll always returns %TRUE.
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*
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* The default implementation of @read_nonblocking calls
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* g_pollable_input_stream_is_readable(), and then calls
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* g_input_stream_read() if it returns %TRUE. This means you only need
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* to override it if it is possible that your @is_readable
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* implementation may return %TRUE when the stream is not actually
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* readable.
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*
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* Since: 2.28
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*/
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struct _GPollableInputStreamInterface
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{
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GTypeInterface g_iface;
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/* Virtual Table */
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gboolean (*can_poll) (GPollableInputStream *stream);
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gboolean (*is_readable) (GPollableInputStream *stream);
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GSource * (*create_source) (GPollableInputStream *stream,
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GCancellable *cancellable);
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gssize (*read_nonblocking) (GPollableInputStream *stream,
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void *buffer,
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gsize count,
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GError **error);
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};
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GIO_AVAILABLE_IN_ALL
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GType g_pollable_input_stream_get_type (void);
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GIO_AVAILABLE_IN_ALL
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gboolean g_pollable_input_stream_can_poll (GPollableInputStream *stream);
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GIO_AVAILABLE_IN_ALL
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gboolean g_pollable_input_stream_is_readable (GPollableInputStream *stream);
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GIO_AVAILABLE_IN_ALL
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GSource *g_pollable_input_stream_create_source (GPollableInputStream *stream,
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GCancellable *cancellable);
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GIO_AVAILABLE_IN_ALL
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gssize g_pollable_input_stream_read_nonblocking (GPollableInputStream *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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G_END_DECLS
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#endif /* __G_POLLABLE_INPUT_STREAM_H__ */
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