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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_Synchronizer.h>
#ifdef PARCLibrary_DISABLE_ATOMICS
# include <pthread.h>
#else
//# include <pthread.h>
#endif
typedef enum {
_PARCSynchronizer_Unlocked = 0,
_PARCSynchronizer_Locked = 1
} _PARCSynchronizer;
struct PARCSynchronizer {
#ifdef PARCLibrary_DISABLE_ATOMICS
pthread_mutex_t mutex;
#else
int mutex;
#endif
};
static void
_parcSynchronizer_Finalize(PARCSynchronizer **instancePtr)
{
parcAssertNotNull(instancePtr, "Parameter must be a non-null pointer to a PARCSynchronizer pointer.");
parcSynchronizer_OptionalAssertValid((*instancePtr));
}
parcObject_ImplementAcquire(parcSynchronizer, PARCSynchronizer);
parcObject_ImplementRelease(parcSynchronizer, PARCSynchronizer);
parcObject_ExtendPARCObject(PARCSynchronizer, _parcSynchronizer_Finalize, NULL, NULL, NULL, NULL, NULL, NULL);
void
parcSynchronizer_AssertValid(const PARCSynchronizer *instance)
{
parcAssertTrue(parcSynchronizer_IsValid(instance),
"PARCSynchronizer is not valid.");
}
PARCSynchronizer *
parcSynchronizer_Create(void)
{
PARCSynchronizer *result = parcObject_CreateInstance(PARCSynchronizer);
#ifdef PARCLibrary_DISABLE_ATOMICS
pthread_mutex_init(&result->mutex, NULL);
#else
result->mutex = _PARCSynchronizer_Unlocked;
#endif
return result;
}
void
parcSynchronizer_Display(const PARCSynchronizer *instance, int indentation)
{
parcDisplayIndented_PrintLine(indentation, "PARCSynchronizer@%p {", instance);
/* Call Display() functions for the fields here. */
parcDisplayIndented_PrintLine(indentation, "}");
}
bool
parcSynchronizer_IsValid(const PARCSynchronizer *instance)
{
bool result = false;
if (instance != NULL) {
result = true;
}
return result;
}
bool
parcSynchronizer_TryLock(PARCSynchronizer *instance)
{
#ifdef PARCLibrary_DISABLE_ATOMICS
bool result = pthread_mutex_trylock(&instance->mutex) == 0;
#else
bool result = __sync_bool_compare_and_swap(&instance->mutex, _PARCSynchronizer_Unlocked, _PARCSynchronizer_Locked);
#endif
return result;
}
void
parcSynchronizer_Lock(PARCSynchronizer *instance)
{
#ifdef PARCLibrary_DISABLE_ATOMICS
pthread_mutex_lock(&instance->mutex);
#else
while (!__sync_bool_compare_and_swap(&instance->mutex, _PARCSynchronizer_Unlocked, _PARCSynchronizer_Locked)) {
;
}
#endif
}
void
parcSynchronizer_Unlock(PARCSynchronizer *instance)
{
#ifdef PARCLibrary_DISABLE_ATOMICS
pthread_mutex_unlock(&instance->mutex);
#else
while (!__sync_bool_compare_and_swap(&instance->mutex, _PARCSynchronizer_Locked, _PARCSynchronizer_Unlocked)) {
;
}
#endif
}
bool
parcSynchronizer_IsLocked(const PARCSynchronizer *barrier)
{
#ifdef PARCLibrary_DISABLE_ATOMICS
PARCSynchronizer *instance = (PARCSynchronizer *) barrier;
bool result = pthread_mutex_trylock(&instance->mutex) != 0;
pthread_mutex_unlock(&instance->mutex);
return result;
#else
return barrier->mutex == _PARCSynchronizer_Locked;
#endif
}
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