include/block/aio_task.h

   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 #include "qemu/coroutine.h"
  29
  30 typedef struct AioTaskPool AioTaskPool;
  31 typedef struct AioTask AioTask;
  32 typedef int coroutine_fn (*AioTaskFunc)(AioTask *task);
  33 struct AioTask {
  34     AioTaskPool *pool;
  35     AioTaskFunc func;
  36     int ret;
  37 };
  38
  39 AioTaskPool *coroutine_fn aio_task_pool_new(int max_busy_tasks);
  40 void aio_task_pool_free(AioTaskPool *);
  41
  42 /* error code of failed task or 0 if all is OK */
  43 int aio_task_pool_status(AioTaskPool *pool);
  44
  45 bool aio_task_pool_empty(AioTaskPool *pool);
  46
  47 /* User provides filled @task, however task->pool will be set automatically */
  48 void coroutine_fn aio_task_pool_start_task(AioTaskPool *pool, AioTask *task);
  49
  50 void coroutine_fn aio_task_pool_wait_slot(AioTaskPool *pool);
  51 void coroutine_fn aio_task_pool_wait_one(AioTaskPool *pool);
  52 void coroutine_fn aio_task_pool_wait_all(AioTaskPool *pool);
  53
  54 #endif /* BLOCK_AIO_TASK_H */