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multi: convert CURLM_STATE_CONNECT_PEND handling to a list 

... instead of scanning through all handles, stash only the actual
handles that are in that state in the new ->pending list and scan that
list only. It should be mostly empty or very short. And only used for
pipelining.

This avoids a rather hefty slow-down especially notable if you add many
handles to the same multi handle. Regression introduced in commit
0f147887 (version 7.30.0).

Bug: http://curl.haxx.se/mail/lib-2014-07/0206.html
Reported-by: David Meyer
This commit is contained in:
Daniel Stenberg 2014-09-02 09:29:50 +02:00
parent 4901ec2324
commit 3c8c873252
2 changed files with 25 additions and 7 deletions
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27
lib/multi.c
View File

@ -309,6 +309,10 @@ struct Curl_multi *Curl_multi_handle(int hashsize, /* socket hash */
if(!multi->msglist)
goto error;
multi->pending = Curl_llist_alloc(multi_freeamsg);
if(!multi->pending)
goto error;
/* allocate a new easy handle to use when closing cached connections */
multi->closure_handle = curl_easy_init();
if(!multi->closure_handle)
@ -334,6 +338,7 @@ struct Curl_multi *Curl_multi_handle(int hashsize, /* socket hash */
Curl_close(multi->closure_handle);
multi->closure_handle = NULL;
Curl_llist_destroy(multi->msglist, NULL);
Curl_llist_destroy(multi->pending, NULL);
free(multi);
return NULL;
@ -1046,7 +1051,12 @@ static CURLMcode multi_runsingle(struct Curl_multi *multi,
/* There was no connection available. We will go to the pending
state and wait for an available connection. */
multistate(data, CURLM_STATE_CONNECT_PEND);
data->result = CURLE_OK;
/* add this handle to the list of connect-pending handles */
if(!Curl_llist_insert_next(multi->pending, multi->pending->tail, data))
data->result = CURLM_OUT_OF_MEMORY;
else
data->result = CURLE_OK;
break;
}
@ -1884,6 +1894,10 @@ CURLMcode curl_multi_cleanup(CURLM *multi_handle)
Curl_llist_destroy(multi->msglist, NULL);
multi->msglist = NULL;
/* remove the pending handles queue */
Curl_llist_destroy(multi->pending, NULL);
multi->msglist = NULL;
/* remove all easy handles */
data = multi->easyp;
while(data) {
@ -2776,16 +2790,17 @@ struct curl_llist *Curl_multi_pipelining_server_bl(struct Curl_multi *multi)
void Curl_multi_process_pending_handles(struct Curl_multi *multi)
{
struct SessionHandle *data;
struct curl_llist_element *e;
data=multi->easyp;
while(data) {
for(e = multi->pending->head; e; e = e->next) {
struct SessionHandle *data = e->ptr;
if(data->mstate == CURLM_STATE_CONNECT_PEND) {
multistate(data, CURLM_STATE_CONNECT);
/* Remove this node from the list */
Curl_llist_remove(multi->pending, e, NULL);
/* Make sure that the handle will be processed soonish. */
Curl_expire(data, 1);
Curl_expire_latest(data, 1);
}
data = data->next; /* operate on next handle */
}
}

5
lib/multihandle.h
View File

@ -7,7 +7,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -75,6 +75,9 @@ struct Curl_multi {
struct curl_llist *msglist; /* a list of messages from completed transfers */
struct curl_llist *pending; /* SessionHandles that are in the
CURLM_STATE_CONNECT_PEND state */
/* callback function and user data pointer for the *socket() API */
curl_socket_callback socket_cb;
void *socket_userp;