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authorSteinar H. Gunderson <sesse@google.com>2007-09-29 14:21:47 +0000
committerSteinar H. Gunderson <sesse@google.com>2007-09-29 14:21:47 +0000
commitc788efffd4c1b00494813639549f3fde36761c8f (patch)
tree9aed7308214f566cfae229d39c380675d3bab4b8 /ares
parentc1a475e70870d8b1ecff2e72452fcd0aec277e51 (diff)
Read and process as many packets as possible in read_udp_packets, to avoid having to run the entire event loop once per packet. (Patch from the Google tree.)
Diffstat (limited to 'ares')
-rw-r--r--ares/ares_process.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/ares/ares_process.c b/ares/ares_process.c
index f3ead0a22..9e03e4034 100644
--- a/ares/ares_process.c
+++ b/ares/ares_process.c
@@ -399,13 +399,17 @@ static void read_udp_packets(ares_channel channel, fd_set *read_fds,
* extra system calls and confusion. */
FD_CLR(server->udp_socket, read_fds);
- count = sread(server->udp_socket, buf, sizeof(buf));
- if (count == -1 && try_again(SOCKERRNO))
- continue;
- else if (count <= 0)
- handle_error(channel, i, now);
-
- process_answer(channel, buf, (int)count, i, 0, now);
+ /* To reduce event loop overhead, read and process as many
+ * packets as we can. */
+ do {
+ count = sread(server->udp_socket, buf, sizeof(buf));
+ if (count == -1 && try_again(SOCKERRNO))
+ continue;
+ else if (count <= 0)
+ handle_error(channel, i, now);
+ else
+ process_answer(channel, buf, (int)count, i, 0, now);
+ } while (count > 0);
}
}