mirror of https://gitee.com/openkylin/qemu.git
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
|
/*
|
||
|
* Aio tasks loops
|
||
|
*
|
||
|
* Copyright (c) 2019 Virtuozzo International GmbH.
|
||
|
*
|
||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
|
* of this software and associated documentation files (the "Software"), to deal
|
||
|
* in the Software without restriction, including without limitation the rights
|
||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
|
* copies of the Software, and to permit persons to whom the Software is
|
||
|
* furnished to do so, subject to the following conditions:
|
||
|
*
|
||
|
* The above copyright notice and this permission notice shall be included in
|
||
|
* all copies or substantial portions of the Software.
|
||
|
*
|
||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
||
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||
|
* THE SOFTWARE.
|
||
|
*/
|
||
|
|
||
|
#include "qemu/osdep.h"
|
||
|
#include "block/aio.h"
|
||
|
#include "block/aio_task.h"
|
||
|
|
||
|
struct AioTaskPool {
|
||
|
Coroutine *main_co;
|
||
|
int status;
|
||
|
int max_busy_tasks;
|
||
|
int busy_tasks;
|
||
|
bool waiting;
|
||
|
};
|
||
|
|
||
|
static void coroutine_fn aio_task_co(void *opaque)
|
||
|
{
|
||
|
AioTask *task = opaque;
|
||
|
AioTaskPool *pool = task->pool;
|
||
|
|
||
|
assert(pool->busy_tasks < pool->max_busy_tasks);
|
||
|
pool->busy_tasks++;
|
||
|
|
||
|
task->ret = task->func(task);
|
||
|
|
||
|
pool->busy_tasks--;
|
||
|
|
||
|
if (task->ret < 0 && pool->status == 0) {
|
||
|
pool->status = task->ret;
|
||
|
}
|
||
|
|
||
|
g_free(task);
|
||
|
|
||
|
if (pool->waiting) {
|
||
|
pool->waiting = false;
|
||
|
aio_co_wake(pool->main_co);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void coroutine_fn aio_task_pool_wait_one(AioTaskPool *pool)
|
||
|
{
|
||
|
assert(pool->busy_tasks > 0);
|
||
|
assert(qemu_coroutine_self() == pool->main_co);
|
||
|
|
||
|
pool->waiting = true;
|
||
|
qemu_coroutine_yield();
|
||
|
|
||
|
assert(!pool->waiting);
|
||
|
assert(pool->busy_tasks < pool->max_busy_tasks);
|
||
|
}
|
||
|
|
||
|
void coroutine_fn aio_task_pool_wait_slot(AioTaskPool *pool)
|
||
|
{
|
||
|
if (pool->busy_tasks < pool->max_busy_tasks) {
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
aio_task_pool_wait_one(pool);
|
||
|
}
|
||
|
|
||
|
void coroutine_fn aio_task_pool_wait_all(AioTaskPool *pool)
|
||
|
{
|
||
|
while (pool->busy_tasks > 0) {
|
||
|
aio_task_pool_wait_one(pool);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void coroutine_fn aio_task_pool_start_task(AioTaskPool *pool, AioTask *task)
|
||
|
{
|
||
|
aio_task_pool_wait_slot(pool);
|
||
|
|
||
|
task->pool = pool;
|
||
|
qemu_coroutine_enter(qemu_coroutine_create(aio_task_co, task));
|
||
|
}
|
||
|
|
||
|
AioTaskPool *coroutine_fn aio_task_pool_new(int max_busy_tasks)
|
||
|
{
|
||
|
AioTaskPool *pool = g_new0(AioTaskPool, 1);
|
||
|
|
||
|
pool->main_co = qemu_coroutine_self();
|
||
|
pool->max_busy_tasks = max_busy_tasks;
|
||
|
|
||
|
return pool;
|
||
|
}
|
||
|
|
||
|
void aio_task_pool_free(AioTaskPool *pool)
|
||
|
{
|
||
|
g_free(pool);
|
||
|
}
|
||
|
|
||
|
int aio_task_pool_status(AioTaskPool *pool)
|
||
|
{
|
||
|
if (!pool) {
|
||
|
return 0; /* Sugar for lazy allocation of aio pool */
|
||
|
}
|
||
|
|
||
|
return pool->status;
|
||
|
}
|
||
|
|
||
|
bool aio_task_pool_empty(AioTaskPool *pool)
|
||
|
{
|
||
|
return pool->busy_tasks == 0;
|
||
|
}
|