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/*
* Copyright © 2017 Gražvydas Ignotas
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#if defined(MISSING_64BIT_ATOMICS) && defined(HAVE_PTHREAD)
#include <stdint.h>
#include <pthread.h>
#if defined(HAVE_FUNC_ATTRIBUTE_WEAK) && !defined(__CYGWIN__)
#define WEAK __attribute__((weak))
#else
#define WEAK
#endif
static pthread_mutex_t sync_mutex = PTHREAD_MUTEX_INITIALIZER;
WEAK uint64_t
__sync_add_and_fetch_8(uint64_t *ptr, uint64_t val)
{
uint64_t r;
pthread_mutex_lock(&sync_mutex);
*ptr += val;
r = *ptr;
pthread_mutex_unlock(&sync_mutex);
return r;
}
WEAK uint64_t
__sync_sub_and_fetch_8(uint64_t *ptr, uint64_t val)
{
uint64_t r;
pthread_mutex_lock(&sync_mutex);
*ptr -= val;
r = *ptr;
pthread_mutex_unlock(&sync_mutex);
return r;
}
WEAK uint64_t
__sync_val_compare_and_swap_8(uint64_t *ptr, uint64_t oldval, uint64_t newval)
{
uint64_t r;
pthread_mutex_lock(&sync_mutex);
r = *ptr;
if (*ptr == oldval)
*ptr = newval;
pthread_mutex_unlock(&sync_mutex);
return r;
}
#endif
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