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/* SPDX-License-Identifier: LGPL-2.1-only */
/*
* The Rin Library – special definitions
*
* Copyright (C) 2015-2021 Gediminas Jakutis
*/
#ifndef LIBRIN_DEFINITIONS_INCLUDED
#define LIBRIN_DEFINITIONS_INCLUDED
/* gcc */
#ifdef __GNUC__
/* weak symbols */
# define WEAK_SYM __attribute__((weak))
/* allow the compiler to check varargs */
# define FORMAT_STRING(a, b) __attribute__((format (gnu_printf, a, b)))
/* 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)
# define FORMAT_STRING(a, b)
/* optimizing likely / unlikely branches */
# define likely(a) (a)
# define unlikely(a) (a)
/* the rest – NOOP */
#else
# define WEAK_SYM
# define FORMAT_STRING(a, b)
# 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)
/* CLOCK_MONOTONIC is prefered when available, as
* it does not suffer from discontinous jumps.
* Otherwise use CLOCK_REALTIME as fallback.
*/
#if defined CLOCK_MONOTONIC
# define RIN_CLOCK_WALL_COUNTER CLOCK_MONOTONIC
#else
# define RIN_CLOCK_WALL_COUNTER CLOCK_REALTIME
#endif /* defined CLOCK_MONOTONIC */
#endif /* LIBRIN_DEFINITIONS_INCLUDED */
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