100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
/******************************************************************************
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*
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* Copyright (C) 2014 Google, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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// #define LOG_TAG "bt_osi_future"
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// #include <assert.h>
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#include "bt_trace.h"
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#include "allocator.h"
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#include "future.h"
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#include "osi.h"
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//#include "osi/include/log.h"
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#include "osi_arch.h"
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struct future_t {
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bool ready_can_be_called;
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osi_sem_t semaphore; // NULL semaphore means immediate future
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void *result;
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};
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static void future_free(future_t *future);
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future_t *future_new(void) {
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future_t *ret = osi_calloc(sizeof(future_t));
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if (!ret) {
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LOG_ERROR("%s unable to allocate memory for return value.", __func__);
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goto error;
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}
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if (osi_sem_new(&ret->semaphore, 1, 0)!=0) {
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LOG_ERROR("%s unable to allocate memory for the semaphore.", __func__);
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goto error;
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}
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ret->ready_can_be_called = true;
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return ret;
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error:;
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future_free(ret);
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return NULL;
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}
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future_t *future_new_immediate(void *value) {
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future_t *ret = osi_calloc(sizeof(future_t));
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if (!ret) {
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LOG_ERROR("%s unable to allocate memory for return value.", __func__);
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goto error;
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}
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ret->result = value;
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ret->ready_can_be_called = false;
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return ret;
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error:;
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future_free(ret);
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return NULL;
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}
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void future_ready(future_t *future, void *value) {
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assert(future != NULL);
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assert(future->ready_can_be_called);
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future->ready_can_be_called = false;
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future->result = value;
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osi_sem_signal(&future->semaphore);
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}
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void *future_await(future_t *future) {
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assert(future != NULL);
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// If the future is immediate, it will not have a semaphore
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if (future->semaphore)
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osi_sem_wait(&future->semaphore, 0);
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void *result = future->result;
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future_free(future);
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return result;
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}
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static void future_free(future_t *future) {
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if (!future)
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return;
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if (!future->semaphore)
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osi_sem_free(&future->semaphore);
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osi_free(future);
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}
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