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coroutine: add co_aio_sleep_ns() to allow sleep in block drivers 

This helper function behaves similarly to co_sleep_ns(), but the
sleeping coroutine will be resumed when using qemu_aio_wait().

Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
Tested-by: Liu Yuan <namei.unix@gmail.com>
Reviewed-by: Liu Yuan <namei.unix@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
MORITA Kazutaka 2013-10-24 16:01:14 +09:00 committed by Kevin Wolf
parent 72e0996c41
commit 3ab7bd1917
2 changed files with 23 additions and 0 deletions
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9
include/block/coroutine.h
View File

@ -215,6 +215,15 @@ void qemu_co_rwlock_unlock(CoRwlock *lock);
*/
void coroutine_fn co_sleep_ns(QEMUClockType type, int64_t ns);
/**
* Yield the coroutine for a given duration
*
* Behaves similarly to co_sleep_ns(), but the sleeping coroutine will be
* resumed when using qemu_aio_wait().
*/
void coroutine_fn co_aio_sleep_ns(AioContext *ctx, QEMUClockType type,
int64_t ns);
/**
* Yield until a file descriptor becomes readable
*

14
qemu-coroutine-sleep.c
View File

@ -13,6 +13,7 @@
#include "block/coroutine.h"
#include "qemu/timer.h"
#include "block/aio.h"
typedef struct CoSleepCB {
QEMUTimer *ts;
@ -37,3 +38,16 @@ void coroutine_fn co_sleep_ns(QEMUClockType type, int64_t ns)
timer_del(sleep_cb.ts);
timer_free(sleep_cb.ts);
}
void coroutine_fn co_aio_sleep_ns(AioContext *ctx, QEMUClockType type,
int64_t ns)
{
CoSleepCB sleep_cb = {
.co = qemu_coroutine_self(),
};
sleep_cb.ts = aio_timer_new(ctx, type, SCALE_NS, co_sleep_cb, &sleep_cb);
timer_mod(sleep_cb.ts, qemu_clock_get_ns(type) + ns);
qemu_coroutine_yield();
timer_del(sleep_cb.ts);
timer_free(sleep_cb.ts);
}