/* grefcount.h: Reference counting * * Copyright 2018 Emmanuele Bassi * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see <http://www.gnu.org/licenses/>. */ #ifndef __GREFCOUNT_H__ #define __GREFCOUNT_H__ #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION) #error "Only <glib.h> can be included directly." #endif #include <glib/gatomic.h> #include <glib/gtypes.h> G_BEGIN_DECLS GLIB_AVAILABLE_IN_2_58 void g_ref_count_init (grefcount *rc); GLIB_AVAILABLE_IN_2_58 void g_ref_count_inc (grefcount *rc); GLIB_AVAILABLE_IN_2_58 gboolean g_ref_count_dec (grefcount *rc); GLIB_AVAILABLE_IN_2_58 gboolean g_ref_count_compare (grefcount *rc, gint val); GLIB_AVAILABLE_IN_2_58 void g_atomic_ref_count_init (gatomicrefcount *arc); GLIB_AVAILABLE_IN_2_58 void g_atomic_ref_count_inc (gatomicrefcount *arc); GLIB_AVAILABLE_IN_2_58 gboolean g_atomic_ref_count_dec (gatomicrefcount *arc); GLIB_AVAILABLE_IN_2_58 gboolean g_atomic_ref_count_compare (gatomicrefcount *arc, gint val); /* On GCC we can use __extension__ to inline the API without using * ancillary functions; we only do this when disabling checks, as * it disables warnings when saturating the reference counters */ #if defined(__GNUC__) && defined(G_DISABLE_CHECKS) # define g_ref_count_init(rc) \ (G_GNUC_EXTENSION ({ \ G_STATIC_ASSERT (sizeof *(rc) == sizeof (grefcount)); \ (void) (0 ? *(rc) ^ *(rc) : 1); \ *(rc) = -1; \ })) # define g_ref_count_inc(rc) \ (G_GNUC_EXTENSION ({ \ G_STATIC_ASSERT (sizeof *(rc) == sizeof (grefcount)); \ (void) (0 ? *(rc) ^ *(rc) : 1); \ if (*(rc) == G_MININT) ; else { \ *(rc) -= 1; \ } \ })) # define g_ref_count_dec(rc) \ (G_GNUC_EXTENSION ({ \ G_STATIC_ASSERT (sizeof *(rc) == sizeof (grefcount)); \ grefcount __rc = *(rc); \ __rc += 1; \ if (__rc == 0) ; else { \ *(rc) = __rc; \ } \ (gboolean) (__rc == 0); \ })) # define g_ref_count_compare(rc,val) \ (G_GNUC_EXTENSION ({ \ G_STATIC_ASSERT (sizeof *(rc) == sizeof (grefcount)); \ (void) (0 ? *(rc) ^ (val) : 1); \ (gboolean) (*(rc) == -(val)); \ })) # define g_atomic_ref_count_init(rc) \ (G_GNUC_EXTENSION ({ \ G_STATIC_ASSERT (sizeof *(rc) == sizeof (gatomicrefcount)); \ (void) (0 ? *(rc) ^ *(rc) : 1); \ *(rc) = 1; \ })) # define g_atomic_ref_count_inc(rc) \ (G_GNUC_EXTENSION ({ \ G_STATIC_ASSERT (sizeof *(rc) == sizeof (gatomicrefcount)); \ (void) (0 ? *(rc) ^ *(rc) : 1); \ (void) (g_atomic_int_get (rc) == G_MAXINT ? 0 : g_atomic_int_inc ((rc))); \ })) # define g_atomic_ref_count_dec(rc) \ (G_GNUC_EXTENSION ({ \ G_STATIC_ASSERT (sizeof *(rc) == sizeof (gatomicrefcount)); \ (void) (0 ? *(rc) ^ *(rc) : 1); \ g_atomic_int_dec_and_test ((rc)); \ })) # define g_atomic_ref_count_compare(rc,val) \ (G_GNUC_EXTENSION ({ \ G_STATIC_ASSERT (sizeof *(rc) == sizeof (gatomicrefcount)); \ (void) (0 ? *(rc) ^ (val) : 1); \ (gboolean) (g_atomic_int_get (rc) == (val)); \ })) #endif /* __GNUC__ && G_DISABLE_CHECKS */ G_END_DECLS #endif /* __GREFCOUNT_H__ */