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cf-socket: make socket data_pending a nop

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Eliminating the socket readability check in the socket connection
filters for the 'data_pending' callback. Improves performance of
handling of transfers, up to ~30%, depending on parallelism and response
size.

Whatever `data_pending()` once was, its semantics are now:
"Is there anything buffered in the connection filters that needs
 receive?"
Any checks of the socket's readability are done via `multi_wait()`
and friends.

Fix the one place in HTTP/1 proxy code that checked `data_pending()` and
did an early return if false. Remove that check and actually try to
receive data every time.

Closes #17785
This commit is contained in:
Stefan Eissing 2025-06-30 08:53:31 +02:00 • committed by Daniel Stenberg
parent a487a4e4bd
commit 21ecc7e376
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GPG key ID: 5CC908FDB71E12C2
5 changed files with 116 additions and 85 deletions
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19
lib/cf-socket.c
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@ -1404,17 +1404,6 @@ static void cf_socket_adjust_pollset(struct Curl_cfilter *cf,
}
}
static bool cf_socket_data_pending(struct Curl_cfilter *cf,
const struct Curl_easy *data)
{
struct cf_socket_ctx *ctx = cf->ctx;
int readable;
(void)data;
readable = SOCKET_READABLE(ctx->sock, 0);
return readable > 0 && (readable & CURL_CSELECT_IN);
}
#ifdef USE_WINSOCK
#ifndef SIO_IDEAL_SEND_BACKLOG_QUERY
@ -1750,7 +1739,7 @@ struct Curl_cftype Curl_cft_tcp = {
cf_socket_close,
cf_socket_shutdown,
cf_socket_adjust_pollset,
cf_socket_data_pending,
Curl_cf_def_data_pending,
cf_socket_send,
cf_socket_recv,
cf_socket_cntrl,
@ -1904,7 +1893,7 @@ struct Curl_cftype Curl_cft_udp = {
cf_socket_close,
cf_socket_shutdown,
cf_socket_adjust_pollset,
cf_socket_data_pending,
Curl_cf_def_data_pending,
cf_socket_send,
cf_socket_recv,
cf_socket_cntrl,
@ -1958,7 +1947,7 @@ struct Curl_cftype Curl_cft_unix = {
cf_socket_close,
cf_socket_shutdown,
cf_socket_adjust_pollset,
cf_socket_data_pending,
Curl_cf_def_data_pending,
cf_socket_send,
cf_socket_recv,
cf_socket_cntrl,
@ -2178,7 +2167,7 @@ struct Curl_cftype Curl_cft_tcp_accept = {
cf_socket_close,
cf_socket_shutdown,
cf_socket_adjust_pollset,
cf_socket_data_pending,
Curl_cf_def_data_pending,
cf_socket_send,
cf_socket_recv,
cf_socket_cntrl,