Commit c1e1e5fa authored by Fam Zheng's avatar Fam Zheng Committed by Kevin Wolf
Browse files

aio: introduce aio_{disable,enable}_external 



Signed-off-by: default avatarFam Zheng <famz@redhat.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent 3a1e8074

aio-posix.c

+2 −1
Original line number Diff line number Diff line
@@ -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);

        }

    }

aio-win32.c

+2 −1
Original line number Diff line number Diff line
@@ -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);

        }

    }

include/block/aio.h

+38 −0
Original line number Diff line number Diff line
@@ -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