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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* 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 <config.h>
#include <pthread.h>
#include <parc/algol/parc_AtomicInteger.h>
#ifdef USE_GCC_EXTENSIONS
uint32_t
parcAtomicInteger_Uint32IncrementGCC(uint32_t *value)
{
return __sync_add_and_fetch(value, 1);
}
uint32_t
parcAtomicInteger_Uint32DecrementGCC(uint32_t *value)
{
return __sync_sub_and_fetch(value, 1);
}
uint64_t
parcAtomicInteger_Uint64IncrementGCC(uint64_t *value)
{
return __sync_add_and_fetch(value, 1);
}
uint64_t
parcAtomicInteger_Uint64DecrementGCC(uint64_t *value)
{
return __sync_sub_and_fetch(value, 1);
}
#endif
// Since there is no per integer mutex, we must use something to protect an integer from multiple,
// simultaneous competitors.
// Unfortunately, this is an indiscrimiate mutex causing all atomic integer updates to be
// serialized rather than each individually protected.
static pthread_mutex_t _parcAtomicInteger_PthreadMutex = PTHREAD_MUTEX_INITIALIZER;
uint32_t
parcAtomicInteger_Uint32IncrementPthread(uint32_t *value)
{
pthread_mutex_lock(&_parcAtomicInteger_PthreadMutex);
*value = *value + 1;
uint32_t result = *value;
pthread_mutex_unlock(&_parcAtomicInteger_PthreadMutex);
return result;
}
uint32_t
parcAtomicInteger_Uint32DecrementPthread(uint32_t *value)
{
pthread_mutex_lock(&_parcAtomicInteger_PthreadMutex);
*value = *value - 1;
uint32_t result = *value;
pthread_mutex_unlock(&_parcAtomicInteger_PthreadMutex);
return result;
}
uint64_t
parcAtomicInteger_Uint64IncrementPthread(uint64_t *value)
{
pthread_mutex_lock(&_parcAtomicInteger_PthreadMutex);
*value = *value + 1;
uint64_t result = *value;
pthread_mutex_unlock(&_parcAtomicInteger_PthreadMutex);
return result;
}
uint64_t
parcAtomicInteger_Uint64DecrementPthread(uint64_t *value)
{
pthread_mutex_lock(&_parcAtomicInteger_PthreadMutex);
*value = *value - 1;
uint64_t result = *value;
pthread_mutex_unlock(&_parcAtomicInteger_PthreadMutex);
return result;
}
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