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author | Stefan Hajnoczi <stefanha@redhat.com> | 2013-11-26 16:18:01 +0100 |
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committer | Stefan Hajnoczi <stefanha@redhat.com> | 2013-12-06 16:53:51 +0100 |
commit | d3fa923044321b2ccc12bbdedd582d2c49d958aa (patch) | |
tree | 47145dfcfa7f48ef385c1393a38c3496da8bae71 /target-alpha/mem_helper.c | |
parent | 0b06ef3bdd17742ae50c0662d3fe8ed944648890 (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