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aio: introduce aio_{disable,enable}_external 

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
stable-2.5
Fam Zheng 2015-10-23 11:08:08 +08:00 committed by Kevin Wolf
parent 3a1e8074d7
commit c1e1e5fa8f
3 changed files with 42 additions and 2 deletions
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3
aio-posix.c
View File

@ -261,7 +261,8 @@ bool aio_poll(AioContext *ctx, bool blocking)
/* fill pollfds */
QLIST_FOREACH(node, &ctx->aio_handlers, node) {
if (!node->deleted && node->pfd.events) {
if (!node->deleted && node->pfd.events
&& aio_node_check(ctx, node->is_external)) {
add_pollfd(node);
}
}

3
aio-win32.c
View File

@ -309,7 +309,8 @@ bool aio_poll(AioContext *ctx, bool blocking)
/* fill fd sets */
count = 0;
QLIST_FOREACH(node, &ctx->aio_handlers, node) {
if (!node->deleted && node->io_notify) {
if (!node->deleted && node->io_notify
&& aio_node_check(ctx, node->is_external)) {
events[count++] = event_notifier_get_handle(node->e);
}
}

38
include/block/aio.h
View File

@ -122,6 +122,8 @@ struct AioContext {
/* TimerLists for calling timers - one per clock type */
QEMUTimerListGroup tlg;
int external_disable_cnt;
};
/**
@ -375,4 +377,40 @@ static inline void aio_timer_init(AioContext *ctx,
*/
int64_t aio_compute_timeout(AioContext *ctx);
/**
* aio_disable_external:
* @ctx: the aio context
*
* Disable the further processing of external clients.
*/
static inline void aio_disable_external(AioContext *ctx)
{
atomic_inc(&ctx->external_disable_cnt);
}
/**
* aio_enable_external:
* @ctx: the aio context
*
* Enable the processing of external clients.
*/
static inline void aio_enable_external(AioContext *ctx)
{
assert(ctx->external_disable_cnt > 0);
atomic_dec(&ctx->external_disable_cnt);
}
/**
* aio_node_check:
* @ctx: the aio context
* @is_external: Whether or not the checked node is an external event source.
*
* Check if the node's is_external flag is okay to be polled by the ctx at this
* moment. True means green light.
*/
static inline bool aio_node_check(AioContext *ctx, bool is_external)
{
return !is_external || !atomic_read(&ctx->external_disable_cnt);
}
#endif