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/******************************************************************************
*
* Copyright (C) 2014 Google, 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 "bt_common.h"
#include "osi/allocator.h"
#include "osi/future.h"
#include "osi/osi.h"
void future_free(future_t *future);
future_t *future_new(void)
{
future_t *ret = osi_calloc(sizeof(future_t));
if (!ret) {
OSI_TRACE_ERROR("%s unable to allocate memory for return value.", __func__);
goto error;
}
if (osi_sem_new(&ret->semaphore, 1, 0) != 0) {
OSI_TRACE_ERROR("%s unable to allocate memory for the semaphore.", __func__);
goto error;
}
ret->ready_can_be_called = true;
return ret;
error:;
future_free(ret);
return NULL;
}
future_t *future_new_immediate(void *value)
{
future_t *ret = osi_calloc(sizeof(future_t));
if (!ret) {
OSI_TRACE_ERROR("%s unable to allocate memory for return value.", __func__);
goto error;
}
ret->result = value;
ret->ready_can_be_called = false;
return ret;
error:;
future_free(ret);
return NULL;
}
void future_ready(future_t *future, void *value)
{
assert(future != NULL);
assert(future->ready_can_be_called);
future->ready_can_be_called = false;
future->result = value;
osi_sem_give(&future->semaphore);
}
void *future_await(future_t *future)
{
assert(future != NULL);
// If the future is immediate, it will not have a semaphore
if (future->semaphore) {
osi_sem_take(&future->semaphore, OSI_SEM_MAX_TIMEOUT);
}
void *result = future->result;
future_free(future);
return result;
}
void future_free(future_t *future)
{
if (!future) {
return;
}
if (future->semaphore) {
osi_sem_free(&future->semaphore);
}
osi_free(future);
}
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