mirror of https://gitee.com/openkylin/glib2.0.git
126 lines
3.9 KiB
C
126 lines
3.9 KiB
C
/* grefcount.h: Reference counting
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*
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* Copyright 2018 Emmanuele Bassi
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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 Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __GREFCOUNT_H__
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#define __GREFCOUNT_H__
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#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
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#error "Only <glib.h> can be included directly."
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#endif
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#include <glib/gatomic.h>
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#include <glib/gtypes.h>
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G_BEGIN_DECLS
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GLIB_AVAILABLE_IN_2_58
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void g_ref_count_init (grefcount *rc);
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GLIB_AVAILABLE_IN_2_58
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void g_ref_count_inc (grefcount *rc);
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GLIB_AVAILABLE_IN_2_58
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gboolean g_ref_count_dec (grefcount *rc);
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GLIB_AVAILABLE_IN_2_58
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gboolean g_ref_count_compare (grefcount *rc,
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gint val);
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GLIB_AVAILABLE_IN_2_58
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void g_atomic_ref_count_init (gatomicrefcount *arc);
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GLIB_AVAILABLE_IN_2_58
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void g_atomic_ref_count_inc (gatomicrefcount *arc);
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GLIB_AVAILABLE_IN_2_58
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gboolean g_atomic_ref_count_dec (gatomicrefcount *arc);
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GLIB_AVAILABLE_IN_2_58
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gboolean g_atomic_ref_count_compare (gatomicrefcount *arc,
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gint val);
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/* On GCC we can use __extension__ to inline the API without using
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* ancillary functions; we only do this when disabling checks, as
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* it disables warnings when saturating the reference counters
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*/
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#if defined(__GNUC__) && defined(G_DISABLE_CHECKS)
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# define g_ref_count_init(rc) \
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(G_GNUC_EXTENSION ({ \
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G_STATIC_ASSERT (sizeof *(rc) == sizeof (grefcount)); \
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(void) (0 ? *(rc) ^ *(rc) : 1); \
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*(rc) = -1; \
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}))
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# define g_ref_count_inc(rc) \
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(G_GNUC_EXTENSION ({ \
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G_STATIC_ASSERT (sizeof *(rc) == sizeof (grefcount)); \
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(void) (0 ? *(rc) ^ *(rc) : 1); \
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if (*(rc) == G_MININT) ; else { \
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*(rc) -= 1; \
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} \
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}))
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# define g_ref_count_dec(rc) \
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(G_GNUC_EXTENSION ({ \
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G_STATIC_ASSERT (sizeof *(rc) == sizeof (grefcount)); \
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grefcount __rc = *(rc); \
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__rc += 1; \
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if (__rc == 0) ; else { \
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*(rc) = __rc; \
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} \
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(gboolean) (__rc == 0); \
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}))
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# define g_ref_count_compare(rc,val) \
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(G_GNUC_EXTENSION ({ \
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G_STATIC_ASSERT (sizeof *(rc) == sizeof (grefcount)); \
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(void) (0 ? *(rc) ^ (val) : 1); \
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(gboolean) (*(rc) == -(val)); \
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}))
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# define g_atomic_ref_count_init(rc) \
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(G_GNUC_EXTENSION ({ \
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G_STATIC_ASSERT (sizeof *(rc) == sizeof (gatomicrefcount)); \
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(void) (0 ? *(rc) ^ *(rc) : 1); \
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*(rc) = 1; \
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}))
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# define g_atomic_ref_count_inc(rc) \
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(G_GNUC_EXTENSION ({ \
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G_STATIC_ASSERT (sizeof *(rc) == sizeof (gatomicrefcount)); \
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(void) (0 ? *(rc) ^ *(rc) : 1); \
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(void) (g_atomic_int_get (rc) == G_MAXINT ? 0 : g_atomic_int_inc ((rc))); \
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}))
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# define g_atomic_ref_count_dec(rc) \
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(G_GNUC_EXTENSION ({ \
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G_STATIC_ASSERT (sizeof *(rc) == sizeof (gatomicrefcount)); \
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(void) (0 ? *(rc) ^ *(rc) : 1); \
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g_atomic_int_dec_and_test ((rc)); \
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}))
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# define g_atomic_ref_count_compare(rc,val) \
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(G_GNUC_EXTENSION ({ \
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G_STATIC_ASSERT (sizeof *(rc) == sizeof (gatomicrefcount)); \
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(void) (0 ? *(rc) ^ (val) : 1); \
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(gboolean) (g_atomic_int_get (rc) == (val)); \
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}))
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#endif /* __GNUC__ && G_DISABLE_CHECKS */
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G_END_DECLS
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#endif /* __GREFCOUNT_H__ */
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