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75ce4741f9
This adds supports for a lock-less a non-shrinking growable array. You can use it to do reads using no locks, as long as your read-code can handle that during the read transaction the object can be modified by another writer (but it will not change size or be freed), and you can only trust the result once the transaction has finished successfully. This doesn't free things like RCU normally does, instead it pushes the memory on a free list that is reused for other atomic arrays.
61 lines
2.1 KiB
C
61 lines
2.1 KiB
C
/* GObject - GLib Type, Object, Parameter and Signal Library
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* Copyright (C) 2009 Benjamin Otte <otte@gnome.org>
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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 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
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#error "Only <glib-object.h> can be included directly."
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#endif
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#ifndef __G_ATOMIC_ARRAY_H__
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#define __G_ATOMIC_ARRAY_H__
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#include <glib/glib.h>
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G_BEGIN_DECLS
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#define G_ATOMIC_ARRAY_DATA_SIZE(mem) (*((gsize *) (mem) - 1))
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typedef struct _GAtomicArray GAtomicArray;
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struct _GAtomicArray {
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volatile gpointer data; /* elements - atomic */
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};
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void _g_atomic_array_init (GAtomicArray *array);
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gpointer _g_atomic_array_copy (GAtomicArray *array,
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gsize header_size,
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gsize additional_element_size);
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void _g_atomic_array_update (GAtomicArray *array,
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gpointer new_data);
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#define G_ATOMIC_ARRAY_GET_LOCKED(_array, _type) ((_type *)((_array)->data))
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#define G_ATOMIC_ARRAY_DO_TRANSACTION(_array, _type, _C_) G_STMT_START { \
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volatile gpointer *_datap = &(_array)->data; \
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_type *transaction_data, *__check; \
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\
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__check = g_atomic_pointer_get (_datap); \
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do { \
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transaction_data = __check; \
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{_C_;} \
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__check = g_atomic_pointer_get (_datap); \
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} while (transaction_data != __check); \
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} G_STMT_END
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G_END_DECLS
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#endif /* __G_ATOMIC_ARRAY_H__ */
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