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via d0f85478c37828eb8a24315d4326eb4eaedb9afc (commit)
from 15d8ae8b0f80f95d7839528b8ac60aa0e2485c77 (commit)
http://gitweb.samba.org/?p=ctdb.git;a=shortlog;h=master
- Log -----------------------------------------------------------------
commit d0f85478c37828eb8a24315d4326eb4eaedb9afc
Author: Ronnie Sahlberg <[email protected]>
Date: Wed Jan 4 21:41:12 2012 +1100
explain why we use FIONREAD
-----------------------------------------------------------------------
Summary of changes:
common/ctdb_io.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
Changeset truncated at 500 lines:
diff --git a/common/ctdb_io.c b/common/ctdb_io.c
index 86e54e0..810fd41 100644
--- a/common/ctdb_io.c
+++ b/common/ctdb_io.c
@@ -78,6 +78,12 @@ static void queue_io_read(struct ctdb_queue *queue)
ssize_t nread;
uint8_t *data;
+ /* check how much data is available on the socket for immediately
+ guaranteed nonblocking access.
+ as long as we are careful never to try to read more than this
+ we know all reads will be successful and will neither block
+ nor fail with a "data not available right now" error
+ */
if (ioctl(queue->fd, FIONREAD, &num_ready) != 0) {
return;
}
--
CTDB repository
