| /****************************************************************************** |
| * |
| * 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. |
| * |
| ******************************************************************************/ |
| |
| #pragma once |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| typedef struct future_t future_t; |
| |
| #define FUTURE_SUCCESS ((void *)1) |
| #define FUTURE_FAIL ((void *)0) |
| |
| // Constructs a new future_t object. Returns NULL on failure. |
| future_t *future_new(void); |
| |
| // Constructs a new future_t object with an immediate |value|. No waiting will |
| // occur in the call to |future_await| because the value is already present. |
| // Returns NULL on failure. |
| future_t *future_new_immediate(void *value); |
| |
| // Signals that the |future| is ready, passing |value| back to the context |
| // waiting for the result. Must only be called once for every future. |
| // |future| may not be NULL. |
| void future_ready(future_t *future, void *value); |
| |
| // Waits for the |future| to be ready. Returns the value set in |future_ready|. |
| // Frees the future before return. |future| may not be NULL. |
| void *future_await(future_t *async_result); |
| |
| #ifdef __cplusplus |
| } |
| #endif |