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cpool/cshutdown: force close connections under pressure

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when CURLMOPT_MAX_HOST_CONNECTIONS or CURLMOPT_MAX_TOTAL_CONNECTIONS
limits are reached, force close connections in shutdown to go below
limit when possible.

Fixes #17020
Reported-by: Fujii Hironori
Closes #17022
This commit is contained in:
Stefan Eissing 2025-04-11 12:05:05 +02:00 • committed by Daniel Stenberg
parent 9f8bdd0eae
commit ff37657e4d
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GPG key ID: 5CC908FDB71E12C2
5 changed files with 108 additions and 34 deletions
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9
lib/url.c
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@ -3597,10 +3597,12 @@ static CURLcode create_conn(struct Curl_easy *data,
conn->bits.tls_enable_alpn = TRUE;
}
if(waitpipe)
if(waitpipe) {
/* There is a connection that *might* become usable for multiplexing
"soon", and we wait for that */
infof(data, "Waiting on connection to negotiate possible multiplexing.");
connections_available = FALSE;
}
else {
switch(Curl_cpool_check_limits(data, conn)) {
case CPOOL_LIMIT_DEST:
@ -3614,7 +3616,8 @@ static CURLcode create_conn(struct Curl_easy *data,
else
#endif
{
infof(data, "No connections available in cache");
infof(data, "No connections available, total of %ld reached.",
data->multi->max_total_connections);
connections_available = FALSE;
}
break;
@ -3624,8 +3627,6 @@ static CURLcode create_conn(struct Curl_easy *data,
}
if(!connections_available) {
infof(data, "No connections available.");
Curl_conn_free(data, conn);
*in_connect = NULL;