I don't know if it's related, but I experienced a similar problem a few
years ago.
It's a console dll written in Freepascal and compiled for Win64 and
Linux (Ubuntu). It uses several threads and uses CheckSynchronize to
make calls in the main thread.
The dll is loaded and used by a 4gl program (www.4js.com), I think the
4gl runtime is compiled with Visual C++ on Windows and GNU C++ on Linux.
With recent (a few years ago) Freepascal a similar CPU consumption when
idle appeared, but only in Windows, not in Linux.
I didn't needed recent functionalities of Freepascal, so a dirty
workaround for me for this project was to stick to Lazarus 1.6 / 2016 02
14 / FPC 3.0.0 / SVN 51360 (from menu Help/About Lazarus). I don't have
the CPU consumption with this version.
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