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/*
* Copyright © 2011 Ryan Lortie
*
* 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/>.
*
* Author: Ryan Lortie <desrt@desrt.ca>
*/
#ifndef __G_ATOMIC_H__
#define __G_ATOMIC_H__
#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
#error "Only <glib.h> can be included directly."
#endif
#include <glib/gtypes.h>
G_BEGIN_DECLS
GLIB_AVAILABLE_IN_ALL
gint g_atomic_int_get (const volatile gint *atomic);
GLIB_AVAILABLE_IN_ALL
void g_atomic_int_set (volatile gint *atomic,
gint newval);
GLIB_AVAILABLE_IN_ALL
void g_atomic_int_inc (volatile gint *atomic);
GLIB_AVAILABLE_IN_ALL
gboolean g_atomic_int_dec_and_test (volatile gint *atomic);
GLIB_AVAILABLE_IN_ALL
gboolean g_atomic_int_compare_and_exchange (volatile gint *atomic,
gint oldval,
gint newval);
GLIB_AVAILABLE_IN_ALL
gint g_atomic_int_add (volatile gint *atomic,
gint val);
GLIB_AVAILABLE_IN_2_30
guint g_atomic_int_and (volatile guint *atomic,
guint val);
GLIB_AVAILABLE_IN_2_30
guint g_atomic_int_or (volatile guint *atomic,
guint val);
GLIB_AVAILABLE_IN_ALL
guint g_atomic_int_xor (volatile guint *atomic,
guint val);
GLIB_AVAILABLE_IN_ALL
gpointer g_atomic_pointer_get (const volatile void *atomic);
GLIB_AVAILABLE_IN_ALL
void g_atomic_pointer_set (volatile void *atomic,
gpointer newval);
GLIB_AVAILABLE_IN_ALL
gboolean g_atomic_pointer_compare_and_exchange (volatile void *atomic,
gpointer oldval,
gpointer newval);
GLIB_AVAILABLE_IN_ALL
gssize g_atomic_pointer_add (volatile void *atomic,
gssize val);
GLIB_AVAILABLE_IN_2_30
gsize g_atomic_pointer_and (volatile void *atomic,
gsize val);
GLIB_AVAILABLE_IN_2_30
gsize g_atomic_pointer_or (volatile void *atomic,
gsize val);
GLIB_AVAILABLE_IN_ALL
gsize g_atomic_pointer_xor (volatile void *atomic,
gsize val);
GLIB_DEPRECATED_IN_2_30_FOR(g_atomic_int_add)
gint g_atomic_int_exchange_and_add (volatile gint *atomic,
gint val);
G_END_DECLS
#if defined(G_ATOMIC_LOCK_FREE) && defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)
/* We prefer the new C11-style atomic extension of GCC if available */
#if defined(__ATOMIC_SEQ_CST) && !defined(__clang__)
/* This assumes sizeof(int) is 4: gatomic.c statically
* asserts that (using G_STATIC_ASSERT at top-level in a header was
* problematic, see #730932) */
#define g_atomic_int_get(atomic) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint)); \
(void) (0 ? *(atomic) ^ *(atomic) : 1); \
(gint) __atomic_load_4 ((atomic), __ATOMIC_SEQ_CST); \
}))
#define g_atomic_int_set(atomic, newval) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint)); \
(void) (0 ? *(atomic) ^ (newval) : 1); \
__atomic_store_4 ((atomic), (newval), __ATOMIC_SEQ_CST); \
}))
#if GLIB_SIZEOF_VOID_P == 8
#define g_atomic_pointer_get(atomic) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
(gpointer) __atomic_load_8 ((atomic), __ATOMIC_SEQ_CST); \
}))
#define g_atomic_pointer_set(atomic, newval) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
(void) (0 ? (gpointer) *(atomic) : NULL); \
__atomic_store_8 ((atomic), (gsize) (newval), __ATOMIC_SEQ_CST); \
}))
#else /* GLIB_SIZEOF_VOID_P == 8 */
/* This assumes that if sizeof(void *) is not 8, then it is 4:
* gatomic.c statically asserts that (using G_STATIC_ASSERT
* at top-level in a header was problematic, see #730932) */
#define g_atomic_pointer_get(atomic) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
(gpointer) __atomic_load_4 ((atomic), __ATOMIC_SEQ_CST); \
}))
#define g_atomic_pointer_set(atomic, newval) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
(void) (0 ? (gpointer) *(atomic) : NULL); \
__atomic_store_4 ((atomic), (gsize) (newval), __ATOMIC_SEQ_CST); \
}))
#endif /* GLIB_SIZEOF_VOID_P == 8 */
#else /* defined(__ATOMIC_SEQ_CST) */
#define g_atomic_int_get(atomic) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint)); \
(void) (0 ? *(atomic) ^ *(atomic) : 1); \
__sync_synchronize (); \
(gint) *(atomic); \
}))
#define g_atomic_int_set(atomic, newval) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint)); \
(void) (0 ? *(atomic) ^ (newval) : 1); \
*(atomic) = (newval); \
__sync_synchronize (); \
}))
#define g_atomic_pointer_get(atomic) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
__sync_synchronize (); \
(gpointer) *(atomic); \
}))
#define g_atomic_pointer_set(atomic, newval) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
(void) (0 ? (gpointer) *(atomic) : NULL); \
*(atomic) = (__typeof__ (*(atomic))) (gsize) (newval); \
__sync_synchronize (); \
}))
#endif /* !defined(__ATOMIC_SEQ_CST) */
#define g_atomic_int_inc(atomic) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint)); \
(void) (0 ? *(atomic) ^ *(atomic) : 1); \
(void) __sync_fetch_and_add ((atomic), 1); \
}))
#define g_atomic_int_dec_and_test(atomic) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint)); \
(void) (0 ? *(atomic) ^ *(atomic) : 1); \
__sync_fetch_and_sub ((atomic), 1) == 1; \
}))
#define g_atomic_int_compare_and_exchange(atomic, oldval, newval) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint)); \
(void) (0 ? *(atomic) ^ (newval) ^ (oldval) : 1); \
(gboolean) __sync_bool_compare_and_swap ((atomic), (oldval), (newval)); \
}))
#define g_atomic_int_add(atomic, val) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint)); \
(void) (0 ? *(atomic) ^ (val) : 1); \
(gint) __sync_fetch_and_add ((atomic), (val)); \
}))
#define g_atomic_int_and(atomic, val) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint)); \
(void) (0 ? *(atomic) ^ (val) : 1); \
(guint) __sync_fetch_and_and ((atomic), (val)); \
}))
#define g_atomic_int_or(atomic, val) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint)); \
(void) (0 ? *(atomic) ^ (val) : 1); \
(guint) __sync_fetch_and_or ((atomic), (val)); \
}))
#define g_atomic_int_xor(atomic, val) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint)); \
(void) (0 ? *(atomic) ^ (val) : 1); \
(guint) __sync_fetch_and_xor ((atomic), (val)); \
}))
#define g_atomic_pointer_compare_and_exchange(atomic, oldval, newval) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
(void) (0 ? (gpointer) *(atomic) : NULL); \
(gboolean) __sync_bool_compare_and_swap ((atomic), (oldval), (newval)); \
}))
#define g_atomic_pointer_add(atomic, val) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
(void) (0 ? (gpointer) *(atomic) : NULL); \
(void) (0 ? (val) ^ (val) : 1); \
(gssize) __sync_fetch_and_add ((atomic), (val)); \
}))
#define g_atomic_pointer_and(atomic, val) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
(void) (0 ? (gpointer) *(atomic) : NULL); \
(void) (0 ? (val) ^ (val) : 1); \
(gsize) __sync_fetch_and_and ((atomic), (val)); \
}))
#define g_atomic_pointer_or(atomic, val) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
(void) (0 ? (gpointer) *(atomic) : NULL); \
(void) (0 ? (val) ^ (val) : 1); \
(gsize) __sync_fetch_and_or ((atomic), (val)); \
}))
#define g_atomic_pointer_xor(atomic, val) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
(void) (0 ? (gpointer) *(atomic) : NULL); \
(void) (0 ? (val) ^ (val) : 1); \
(gsize) __sync_fetch_and_xor ((atomic), (val)); \
}))
#else /* defined(G_ATOMIC_LOCK_FREE) && defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4) */
#define g_atomic_int_get(atomic) \
(g_atomic_int_get ((gint *) (atomic)))
#define g_atomic_int_set(atomic, newval) \
(g_atomic_int_set ((gint *) (atomic), (gint) (newval)))
#define g_atomic_int_compare_and_exchange(atomic, oldval, newval) \
(g_atomic_int_compare_and_exchange ((gint *) (atomic), (oldval), (newval)))
#define g_atomic_int_add(atomic, val) \
(g_atomic_int_add ((gint *) (atomic), (val)))
#define g_atomic_int_and(atomic, val) \
(g_atomic_int_and ((guint *) (atomic), (val)))
#define g_atomic_int_or(atomic, val) \
(g_atomic_int_or ((guint *) (atomic), (val)))
#define g_atomic_int_xor(atomic, val) \
(g_atomic_int_xor ((guint *) (atomic), (val)))
#define g_atomic_int_inc(atomic) \
(g_atomic_int_inc ((gint *) (atomic)))
#define g_atomic_int_dec_and_test(atomic) \
(g_atomic_int_dec_and_test ((gint *) (atomic)))
#define g_atomic_pointer_get(atomic) \
(g_atomic_pointer_get (atomic))
#define g_atomic_pointer_set(atomic, newval) \
(g_atomic_pointer_set ((atomic), (gpointer) (newval)))
#define g_atomic_pointer_compare_and_exchange(atomic, oldval, newval) \
(g_atomic_pointer_compare_and_exchange ((atomic), (gpointer) (oldval), (gpointer) (newval)))
#define g_atomic_pointer_add(atomic, val) \
(g_atomic_pointer_add ((atomic), (gssize) (val)))
#define g_atomic_pointer_and(atomic, val) \
(g_atomic_pointer_and ((atomic), (gsize) (val)))
#define g_atomic_pointer_or(atomic, val) \
(g_atomic_pointer_or ((atomic), (gsize) (val)))
#define g_atomic_pointer_xor(atomic, val) \
(g_atomic_pointer_xor ((atomic), (gsize) (val)))
#endif /* defined(__GNUC__) && defined(G_ATOMIC_OP_USE_GCC_BUILTINS) */
#endif /* __G_ATOMIC_H__ */