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/*
* The Rin Library – special definitions
*
* Copyright (C) 2015 Gediminas Jakutis
*
* 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; version 2.1
* of the License.
*
* This program 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef LIBRIN_DEFINITIONS_INCLUDED
#define LIBRIN_DEFINITIONS_INCLUDED
/* gcc */
#ifdef __GNUC__
/* weak symbols */
# define WEAK_SYM __attribute__((weak))
/* optimizing likely / unlikely branches */
# define likely(a) (__builtin_expect(!!(a), 1))
# define unlikely(a) (__builtin_expect((a), 0))
/* MSVC */
#elif defined(_MSC_VER)
/* weak symbols */
# define WEAK_SYM __declspec(selectany)
/* optimizing likely / unlikely branches */
# define likely(a) (a)
# define unlikely(a) (a)
/* the rest – NOOP */
#else
# define WEAK_SYM
# define likely(a) (a)
# define unlikely(a) (a)
#endif
#define rin_once(func) \
do { \
static unsigned int __rin_firstrun = 1; \
if (__rin_firstrun) { \
--__rin_firstrun; \
func; \
} \
} while (0)
#endif /* LIBRIN_DEFINITIONS_INCLUDED */
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