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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2013-11-26 16:18:01 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2013-12-06 16:53:51 +0100 |
| commit | d3fa923044321b2ccc12bbdedd582d2c49d958aa (patch) | |
| tree | 47145dfcfa7f48ef385c1393a38c3496da8bae71 /tests/test-aio.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 'tests/test-aio.c')
| -rw-r--r-- | tests/test-aio.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/tests/test-aio.c b/tests/test-aio.c index c4fe0fc3b7..592721ed3f 100644 --- a/tests/test-aio.c +++ b/tests/test-aio.c @@ -195,7 +195,6 @@ static void test_bh_delete_from_cb(void) g_assert(data1.bh == NULL); g_assert(!aio_poll(ctx, false)); - g_assert(!aio_poll(ctx, true)); } static void test_bh_delete_from_cb_many(void) |