xref: /openbmc/qemu/include/block/aio_task.h (revision 8d3031fa)
1 /*
2  * Aio tasks loops
3  *
4  * Copyright (c) 2019 Virtuozzo International GmbH.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
24 
25 #ifndef BLOCK_AIO_TASK_H
26 #define BLOCK_AIO_TASK_H
27 
28 typedef struct AioTaskPool AioTaskPool;
29 typedef struct AioTask AioTask;
30 typedef int coroutine_fn (*AioTaskFunc)(AioTask *task);
31 struct AioTask {
32     AioTaskPool *pool;
33     AioTaskFunc func;
34     int ret;
35 };
36 
37 AioTaskPool *coroutine_fn aio_task_pool_new(int max_busy_tasks);
38 void aio_task_pool_free(AioTaskPool *);
39 
40 /* error code of failed task or 0 if all is OK */
41 int aio_task_pool_status(AioTaskPool *pool);
42 
43 /* User provides filled @task, however task->pool will be set automatically */
44 void coroutine_fn aio_task_pool_start_task(AioTaskPool *pool, AioTask *task);
45 
46 void coroutine_fn aio_task_pool_wait_slot(AioTaskPool *pool);
47 void coroutine_fn aio_task_pool_wait_one(AioTaskPool *pool);
48 void coroutine_fn aio_task_pool_wait_all(AioTaskPool *pool);
49 
50 #endif /* BLOCK_AIO_TASK_H */
51