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lib: keep timestamp in easy handle

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Use `data->progress.now` as the timestamp of proecssing a transfer.
Update it on significant events and refrain from calling `curlx_now()`
in many places.

The problem this addresses is
a) calling curlx_now() has costs, depending on platform. Calling it
   every time results in 25% increase `./runtest` duration on macOS.
b) we used to pass a `struct curltime *` around to save on calls, but
   when some method directly use `curx_now()` and some use the passed
   pointer, the transfer experienes non-linear time. This results in
   timeline checks to report events in the wrong order.

By keeping a timestamp in the easy handle and updating it there, no
longer invoking `curlx_now()` in the "lower" methods, the transfer
can observer a steady clock progression.

Add documentation in docs/internals/TIME-KEEPING.md

Reported-by: Viktor Szakats
Fixes #19935
Closes #19961
This commit is contained in:
Stefan Eissing 2025-12-15 14:28:09 +01:00 • committed by Daniel Stenberg
parent 425a2aa1af
commit 2de22a00c7
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67 changed files with 598 additions and 458 deletions
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4
lib/http.c
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@ -4949,7 +4949,7 @@ static CURLcode cr_exp100_read(struct Curl_easy *data,
DEBUGF(infof(data, "cr_exp100_read, start AWAITING_CONTINUE, "
"timeout %dms", data->set.expect_100_timeout));
ctx->state = EXP100_AWAITING_CONTINUE;
ctx->start = curlx_now();
ctx->start = data->progress.now;
Curl_expire(data, data->set.expect_100_timeout, EXPIRE_100_TIMEOUT);
*nread = 0;
*eos = FALSE;
@ -4960,7 +4960,7 @@ static CURLcode cr_exp100_read(struct Curl_easy *data,
*eos = FALSE;
return CURLE_READ_ERROR;
case EXP100_AWAITING_CONTINUE:
ms = curlx_timediff_ms(curlx_now(), ctx->start);
ms = curlx_timediff_ms(data->progress.now, ctx->start);
if(ms < data->set.expect_100_timeout) {
DEBUGF(infof(data, "cr_exp100_read, AWAITING_CONTINUE, not expired"));
*nread = 0;