From: mw40171@mucweb.de   
      
   On 9/13/25 16:11, Arne Vajhøj wrote:   
      
   >> $ pas s3   
   >> $ link/thread s3 + pzmqdir:pzmq + pzmqdir:common + zmq$root:   
   >> [lib]libzmq64/lib   
   >   
   > /thread is not strictly needed, but without it breaking the   
   > infinite loop with CTRL/Y exits a bit hard.   
      
   /THREAD enables upcalls and multiple kernel threads.   
      
   The linker was changed to enable Upcalls whenever it sees that threads   
   are used and no /THREAD was given. In this case the linker prints an   
   informational message.   
      
   If you link without /THREAD, do you see the linker message? The shown   
   "Upcalls are disabled. Multiple kernel threads are disabled" indicates   
   you did not.   
      
   If you do not see the message, then I assume the threaded code is in a   
   shareable image. The linker does not check whether threads are used in   
   shareables.  From the shown link command I don't see that a threaded   
   shareable image is involved.   
      
   It would be interesting to know whether /THREAD=UPCALLS is enough to   
   make this work. I suspect it is.   
      
   Do you have any idea where threaded code is used? What is ICTX?   
      
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