Threadbare threads using WM_FORK message?

[vtailor at gte dot net]

One way to implement a thread in more recent versions of Windows
is to use SendMessage to initiate that thread.  You define a
WM_USER message called WM_THREAD, then subclass the main window
to include a WM_THREAD case.  The LPARAM of SendMessage then carries
a two-element structure containing the entry point of the thread
function and its parameter list.

Waiting for the thread to complete then involves testing for some
completion criterion while performing a PeekMessage loop.  This, of
course relies on the alleged pre-emptive multitasking of recent
Windows releases.

This won't work in the Microsoft console window, because of imposed
limitations, but any emulation of such a text window would work.
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