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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 |
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