atomic.c

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/*
    This file is part of darktable,
    Copyright (C) 2009-2011 johannes hanika.
    Copyright (C) 2012 Richard Wonka.
    Copyright (C) 2016 Roman Lebedev.
    Copyright (C) 2016 Tobias Ellinghaus.
    Copyright (C) 2020 GrahamByrnes.
    Copyright (C) 2020 Marco.
    Copyright (C) 2020 parafin.
    Copyright (C) 2020 Pascal Obry.
    Copyright (C) 2020 Ralf Brown.
    Copyright (C) 2022 Martin Bařinka.
    
    darktable is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    
    darktable 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 General Public License for more details.
    
    You should have received a copy of the GNU General Public License
    along with darktable.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#include "common/atomic.h"
 
extern inline void dt_atomic_set_int(dt_atomic_int *var, int value);
extern inline int dt_atomic_get_int(dt_atomic_int *var);
extern inline void dt_atomic_set_uint64(dt_atomic_uint64 *var, uint64_t value);
extern inline uint64_t dt_atomic_get_uint64(const dt_atomic_uint64 *var);
extern inline int dt_atomic_add_int(dt_atomic_int *var, int incr);
extern inline int dt_atomic_sub_int(dt_atomic_int *var, int decr);
extern inline int dt_atomic_exch_int(dt_atomic_int *var, int value);
extern inline int dt_atomic_CAS_int(dt_atomic_int *var, int *expected, int value);
extern inline void dt_atomic_or_int(dt_atomic_int *var, int flags);
extern inline void dt_atomic_and_int(dt_atomic_int *var, int flags);
 
#if !defined(__STDC_NO_ATOMICS__)
// using C11 atomics, everything is handled in the header file, so we don't need to define anything in this file
 
#elif defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNU_MINOR__ >= 8))
// using GNU intrinsics. everything is handled in the header file
 
#else
// we fell back to using a global mutex for synchronization
// this is that mutex's definition
pthread_mutex_t dt_atom_mutex = PTHREAD_MUTEX_INITIALIZER;
 
#endif // __STDC_NO_ATOMICS__
 
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