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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 <parc/algol/parc_Object.h>
#include <parc/algol/parc_DisplayIndented.h>
#include <parc/concurrent/parc_AtomicUint8.h>
struct PARCAtomicUint8 {
uint8_t value;
#ifdef PARCLibrary_DISABLE_ATOMICS
pthread_mutex_t mutex;
#endif
};
static void
_parcAtomicUint8_Finalize(PARCAtomicUint8 **instancePtr)
{
assertNotNull(instancePtr, "Parameter must be a non-null pointer to a PARCAtomicUint8 pointer.");
parcAtomicUint8_OptionalAssertValid((*instancePtr));
/* cleanup the instance fields here */
}
parcObject_ImplementAcquire(parcAtomicUint8, PARCAtomicUint8);
parcObject_ImplementRelease(parcAtomicUint8, PARCAtomicUint8);
parcObject_ExtendPARCObject(PARCAtomicUint8, _parcAtomicUint8_Finalize, parcAtomicUint8_Copy, NULL, parcAtomicUint8_Equals, parcAtomicUint8_Compare, parcAtomicUint8_HashCode, NULL);
void
parcAtomicUint8_AssertValid(const PARCAtomicUint8 *instance)
{
assertTrue(parcAtomicUint8_IsValid(instance),
"PARCAtomicUint8 is not valid.");
}
PARCAtomicUint8 *
parcAtomicUint8_Create(uint8_t value)
{
PARCAtomicUint8 *result = parcObject_CreateAndClearInstance(PARCAtomicUint8);
#ifdef PARCLibrary_DISABLE_ATOMICS
pthread_mutex_init(&result->mutex, NULL);
result->value = value;
#else
*result = value;
#endif
return result;
}
int
parcAtomicUint8_Compare(const PARCAtomicUint8 *instance, const PARCAtomicUint8 *other)
{
int8_t comparison = parcAtomicUint8_GetValue(instance) - parcAtomicUint8_GetValue(other);
int result = 0;
if (comparison < 0) {
result = -1;
} else if (comparison > 0) {
result = 1;
}
return result;
}
PARCAtomicUint8 *
parcAtomicUint8_Copy(const PARCAtomicUint8 *original)
{
PARCAtomicUint8 *result = parcAtomicUint8_Create(parcAtomicUint8_GetValue(original));
return result;
}
bool
parcAtomicUint8_Equals(const PARCAtomicUint8 *x, const PARCAtomicUint8 *y)
{
bool result = false;
result = parcAtomicUint8_GetValue(x) == parcAtomicUint8_GetValue(y);
return result;
}
PARCHashCode
parcAtomicUint8_HashCode(const PARCAtomicUint8 *instance)
{
PARCHashCode result = (uint32_t) parcAtomicUint8_GetValue(instance);
return result;
}
bool
parcAtomicUint8_IsValid(const PARCAtomicUint8 *instance)
{
bool result = false;
if (instance != NULL) {
result = true;
}
return result;
}
uint8_t
parcAtomicUint8_GetValue(const PARCAtomicUint8 *instance)
{
#ifdef PARCLibrary_DISABLE_ATOMICS
return instance->value;
#else
return *instance;
#endif
}
uint8_t
parcAtomicUint8_AddImpl(PARCAtomicUint8 *value, uint8_t addend)
{
#ifdef PARCLibrary_DISABLE_ATOMICS
pthread_mutex_lock(&value->mutex);
value->value += addend;
uint8_t result = value->value;
pthread_mutex_unlock(&value->mutex);
return result;
#else
return __sync_add_and_fetch(value, addend);
#endif
}
uint8_t
parcAtomicUint8_SubtractImpl(PARCAtomicUint8 *value, uint8_t subtrahend)
{
#ifdef PARCLibrary_DISABLE_ATOMICS
pthread_mutex_lock(&value->mutex);
value->value -= subtrahend;
uint8_t result = value->value;
pthread_mutex_unlock(&value->mutex);
return result;
#else
return __sync_sub_and_fetch(value, subtrahend);
#endif
}
bool
parcAtomicUint8_CompareAndSwapImpl(PARCAtomicUint8 *value, uint8_t predicate, uint8_t newValue)
{
bool result = false;
#ifdef PARCLibrary_DISABLE_ATOMICS
pthread_mutex_lock(&value->mutex);
if (value->value == predicate) {
value->value = newValue;
result = true;
}
pthread_mutex_unlock(&value->mutex);
return result;
#else
result = __sync_bool_compare_and_swap(value, predicate, newValue);
#endif
return result;
}
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