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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.
*
******************************************************************************/
#define LOG_TAG "bt_osi_future"
#include "osi/include/future.h"
#include <base/logging.h>
#include "osi/include/allocator.h"
#include "osi/include/log.h"
#include "osi/include/osi.h"
#include "osi/include/semaphore.h"
struct future_t {
bool ready_can_be_called;
semaphore_t* semaphore; // NULL semaphore means immediate future
void* result;
};
static void future_free(future_t* future);
future_t* future_new(void) {
future_t* ret = static_cast<future_t*>(osi_calloc(sizeof(future_t)));
ret->semaphore = semaphore_new(0);
if (!ret->semaphore) {
LOG_ERROR(LOG_TAG, "%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 = static_cast<future_t*>(osi_calloc(sizeof(future_t)));
ret->result = value;
ret->ready_can_be_called = false;
return ret;
}
void future_ready(future_t* future, void* value) {
CHECK(future != NULL);
CHECK(future->ready_can_be_called);
future->ready_can_be_called = false;
future->result = value;
semaphore_post(future->semaphore);
}
void* future_await(future_t* future) {
CHECK(future != NULL);
// If the future is immediate, it will not have a semaphore
if (future->semaphore) semaphore_wait(future->semaphore);
void* result = future->result;
future_free(future);
return result;
}
static void future_free(future_t* future) {
if (!future) return;
semaphore_free(future->semaphore);
osi_free(future);
}
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