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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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5
lib/file.c
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@ -315,7 +315,6 @@ static CURLcode file_upload(struct Curl_easy *data,
CURLcode result = CURLE_OK;
char *xfer_ulbuf;
size_t xfer_ulblen;
curl_off_t bytecount = 0;
struct_stat file_stat;
const char *sendbuf;
bool eos = FALSE;
@ -405,9 +404,7 @@ static CURLcode file_upload(struct Curl_easy *data,
result = CURLE_SEND_ERROR;
break;
}
bytecount += nwritten;
Curl_pgrsSetUploadCounter(data, bytecount);
Curl_pgrs_upload_inc(data, nwritten);
result = Curl_pgrsCheck(data);
}