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authorStefan Hajnoczi <stefanha@redhat.com>2013-11-26 16:18:01 +0100
committerStefan Hajnoczi <stefanha@redhat.com>2013-12-06 16:53:51 +0100
commitd3fa923044321b2ccc12bbdedd582d2c49d958aa (patch)
tree47145dfcfa7f48ef385c1393a38c3496da8bae71 /target-alpha/mem_helper.c
parent0b06ef3bdd17742ae50c0662d3fe8ed944648890 (diff)
aio: make aio_poll(ctx, true) block with no fds
This patch drops a special case where aio_poll(ctx, true) returns false instead of blocking if no file descriptors are waiting on I/O. Now it is possible to block in aio_poll() to wait for aio_notify(). This change eliminates busy waiting. bdrv_drain_all() used to rely on busy waiting to completed throttled I/O requests but this is no longer required so we can simplify aio_poll(). Note that aio_poll() still returns false when aio_notify() was used. In other words, stopping a blocking aio_poll() wait is not considered making progress. Adjust test-aio /aio/bh/callback-delete/one which assumed aio_poll(ctx, true) would immediately return false instead of blocking. Reviewed-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'target-alpha/mem_helper.c')
0 files changed, 0 insertions, 0 deletions