LXR qemu/include/block/aio

   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
  30typedef struct AioTaskPool AioTaskPool;
  31typedef struct AioTask AioTask;
  32typedef int coroutine_fn (*AioTaskFunc)(AioTask *task);
  33struct AioTask {
  34    AioTaskPool *pool;
  35    AioTaskFunc func;
  36    int ret;
  37};
  38
  39AioTaskPool *coroutine_fn aio_task_pool_new(int max_busy_tasks);
  40void aio_task_pool_free(AioTaskPool *);
  41
  42/* error code of failed task or 0 if all is OK */
  43int aio_task_pool_status(AioTaskPool *pool);
  44
  45bool aio_task_pool_empty(AioTaskPool *pool);
  46
  47/* User provides filled @task, however task->pool will be set automatically */
  48void coroutine_fn aio_task_pool_start_task(AioTaskPool *pool, AioTask *task);
  49
  50void coroutine_fn aio_task_pool_wait_slot(AioTaskPool *pool);
  51void coroutine_fn aio_task_pool_wait_one(AioTaskPool *pool);
  52void coroutine_fn aio_task_pool_wait_all(AioTaskPool *pool);
  53
  54#endif /* BLOCK_AIO_TASK_H */
  55