Kernel threads allow a multithreaded application to have a thread
executing on every CPU in a multiprocessor system. The /THREADS_
ENABLE qualifier allows you to turn kernel threads on and off on
a per-image basis.
When you specify this qualifier, the OpenVMS linker sets the
appropriate bits in the dynamic segment (x86 and I64) or the
image header (Alpha and VAX) of the image being linked. These
bits control the following:
o Whether the image is allowed to enter a multiple kernel
threads environment
o Whether the image can receive upcalls from the OpenVMS
scheduler
If you do not specify this qualifier, the OpenVMS x86 and I64
linker check whether the image to be linked is threaded. If
it is, the linker automatically enables upcalls and informs
the user with a message. This behavior can be overwritten with
negating the qualifier or enabling only multiple kernel threads.
Format
/THREADS_ENABLE[=(MULTIPLE_KERNEL_THREADS,UPCALLS)]
/NOTHREADS_ENABLE (default)
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