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/*
* Copyright 2014 MongoDB, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "bson-atomic.h"
/*
* We should only ever hit these on non-Windows systems, for which we require
* pthread support. Therefore, we will avoid making a threading portability
* for threads here and just use pthreads directly.
*/
#ifdef __BSON_NEED_BARRIER
#include <pthread.h>
static pthread_mutex_t gBarrier = PTHREAD_MUTEX_INITIALIZER;
void
bson_memory_barrier (void)
{
pthread_mutex_lock (&gBarrier);
pthread_mutex_unlock (&gBarrier);
}
#endif
#ifdef __BSON_NEED_ATOMIC_32
#warning "Using mutex to emulate 32-bit atomics."
#include <pthread.h>
static pthread_mutex_t gSync32 = PTHREAD_MUTEX_INITIALIZER;
int32_t
bson_atomic_int_add (volatile int32_t *p,
int32_t n)
{
int ret;
pthread_mutex_lock (&gSync32);
*p += n;
ret = *p;
pthread_mutex_unlock (&gSync32);
return ret;
}
#endif
#ifdef __BSON_NEED_ATOMIC_64
#include <pthread.h>
static pthread_mutex_t gSync64 = PTHREAD_MUTEX_INITIALIZER;
int64_t
bson_atomic_int64_add (volatile int64_t *p,
int64_t n)
{
int64_t ret;
pthread_mutex_lock (&gSync64);
*p += n;
ret = *p;
pthread_mutex_unlock (&gSync64);
return ret;
}
#endif
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