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/* Atomic operations. gcc intrinsics version.
Copyright (C) 2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _BITS_ATOMIC_H
#define _BITS_ATOMIC_H 1
typedef __volatile int __atomic_t;
static inline void
__atomic_inc (__atomic_t *__var)
{
__atomic_add_fetch (__var, 1, __ATOMIC_SEQ_CST);
}
static inline void
__atomic_dec (__atomic_t *__var)
{
__atomic_add_fetch (__var, -1, __ATOMIC_SEQ_CST);
}
static inline int
__atomic_dec_and_test (__atomic_t *__var)
{
__atomic_t res = __atomic_add_fetch (__var, -1, __ATOMIC_SEQ_CST);
return res == 0;
}
#define atomic_loadx(p) __atomic_load_8(p, __ATOMIC_SEQ_CST)
#define atomic_storex(p, v) __atomic_store_8(p, v, __ATOMIC_SEQ_CST)
static inline char atomic_casx_bool(uint64_t *p,
uint32_t elo, uint32_t ehi, uint32_t nlo, uint32_t nhi)
{
uint64_t n = nlo | (((uint64_t) nhi) << 32);
uint64_t e = elo | (((uint64_t) ehi) << 32);
return __atomic_compare_exchange(p,
&e, &n, 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
}
#endif
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