[mirror_qemu.git] / util / aio-wait.c

/*
 * AioContext wait support
 *
 * Copyright (C) 2018 Red Hat, Inc.
 *
 * 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 "qemu/main-loop.h"
#include "block/aio-wait.h"

static void dummy_bh_cb(void *opaque)
{
    /* The point is to make AIO_WAIT_WHILE()'s aio_poll() return */
}

void aio_wait_kick(AioWait *wait)
{
    /* The barrier (or an atomic op) is in the caller.  */
    if (atomic_read(&wait->need_kick)) {
        aio_bh_schedule_oneshot(qemu_get_aio_context(), dummy_bh_cb, NULL);
    }
}
Commit	Line	Data
7719f3c9 SH	1	/*
	2	* AioContext wait support
	3	*
	4	* Copyright (C) 2018 Red Hat, Inc.
	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	#include "qemu/osdep.h"
	26	#include "qemu/main-loop.h"
	27	#include "block/aio-wait.h"
	28
	29	static void dummy_bh_cb(void *opaque)
	30	{
	31	/* The point is to make AIO_WAIT_WHILE()'s aio_poll() return */
	32	}
	33
	34	void aio_wait_kick(AioWait *wait)
	35	{
	36	/* The barrier (or an atomic op) is in the caller. */
	37	if (atomic_read(&wait->need_kick)) {
	38	aio_bh_schedule_oneshot(qemu_get_aio_context(), dummy_bh_cb, NULL);
	39	}
	40	}