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aio-wait.h: introduce AIO_WAIT_WHILE_UNLOCKED

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Same as AIO_WAIT_WHILE macro, but if we are in the Main loop
do not release and then acquire ctx_ 's aiocontext.

Once all Aiocontext locks go away, this macro will replace
AIO_WAIT_WHILE.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-Id: <20220926093214.506243-5-eesposit@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2022-09-26 05:31:57 -04:00 committed by Kevin Wolf
parent 544f4d5258
commit fd4b14e299
1 changed files with 13 additions and 4 deletions
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17
include/block/aio-wait.h
View File

@ -59,10 +59,13 @@ typedef struct {
extern AioWait global_aio_wait;
/**
* AIO_WAIT_WHILE:
* AIO_WAIT_WHILE_INTERNAL:
* @ctx: the aio context, or NULL if multiple aio contexts (for which the
* caller does not hold a lock) are involved in the polling condition.
* @cond: wait while this conditional expression is true
* @unlock: whether to unlock and then lock again @ctx. This apples
* only when waiting for another AioContext from the main loop.
* Otherwise it's ignored.
*
* Wait while a condition is true. Use this to implement synchronous
* operations that require event loop activity.
@ -75,7 +78,7 @@ extern AioWait global_aio_wait;
* wait on conditions between two IOThreads since that could lead to deadlock,
* go via the main loop instead.
*/
#define AIO_WAIT_WHILE(ctx, cond) ({ \
#define AIO_WAIT_WHILE_INTERNAL(ctx, cond, unlock) ({ \
bool waited_ = false; \
AioWait *wait_ = &global_aio_wait; \
AioContext *ctx_ = (ctx); \
@ -92,11 +95,11 @@ extern AioWait global_aio_wait;
assert(qemu_get_current_aio_context() == \
qemu_get_aio_context()); \
while ((cond)) { \
if (ctx_) { \
if (unlock && ctx_) { \
aio_context_release(ctx_); \
} \
aio_poll(qemu_get_aio_context(), true); \
if (ctx_) { \
if (unlock && ctx_) { \
aio_context_acquire(ctx_); \
} \
waited_ = true; \
@ -105,6 +108,12 @@ extern AioWait global_aio_wait;
qatomic_dec(&wait_->num_waiters); \
waited_; })
#define AIO_WAIT_WHILE(ctx, cond) \
AIO_WAIT_WHILE_INTERNAL(ctx, cond, true)
#define AIO_WAIT_WHILE_UNLOCKED(ctx, cond) \
AIO_WAIT_WHILE_INTERNAL(ctx, cond, false)
/**
* aio_wait_kick:
* Wake up the main thread if it is waiting on AIO_WAIT_WHILE(). During