High CPU consumption while waiting for user's input in WIN-ACCEPT

[ikysil]

Root cause - call to ReadConsoleInput in WIN-CONSOLE-EKEY fails with

ERROR_INVALID_FUNCTION

1 (0x1)

Incorrect function.

Both Cygwin and Git-Bash (MSYS) consoles are affected.

Seems to be working fine in CMD or WSL console window.

[ruv]

When a Windows console application is running under Cygwin terminal (mintty), it is running with stdio redirection to pipes, and a console window is not created. So, ReadConsoleInput returns error 0x6 ERROR_INVALID_HANDLE in such case.

It is useful if a Forth system is able to work with redirected stdio, regardless Cygwin terminals.

Regarding Bash shell. It can be started from mintty — and ReadConsoleInput will not work in child console applications; or from Windows console (e.g. regular instance of cmd.exe) — and ReadConsoleInput will work in child console applications.

[ikysil]

Repair for high CPU consumption has been confirmed using release v20.03-RC5