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Avoid spinning on OpenSSL reads

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Previously, if some sender were generating data to read on an
OpenSSL connection as fast as we could process it, we could easily
wind up looping on an openssl do_read operation without ever
considering other sockets.

The difference between this and the original method in
consider_reading() is that it only loops for a single completed
*frame* instead of looping until fd is drained or an error condition
was triggered.

{Patch split out by nickm}
This commit is contained in:
Mark Ellzey 2011-11-17 11:59:41 -05:00 committed by Nick Mathewson
parent 96c562fa49
commit 2aa036fa04
1 changed files with 6 additions and 3 deletions
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9
bufferevent_openssl.c
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@ -766,10 +766,13 @@ consider_reading(struct bufferevent_openssl *bev_ssl)
if (bev_ssl->write_blocked_on_read)
return;
while ((n_to_read = bytes_to_read(bev_ssl)) != 0) {
r = do_read(bev_ssl, n_to_read);
if (r <= 0)
n_to_read = bytes_to_read(bev_ssl);
while (n_to_read) {
if (do_read(bev_ssl, n_to_read) <= 0)
break;
n_to_read = SSL_pending(bev_ssl->ssl);
}
if (!bev_ssl->underlying) {