Re: No threads on SPARC?

>pardo@cs.washington.edu (David Keppel) writes:
>> [Y]ou can't write a truly user-space threads package on the SPARC ...


mueller@mount.fsu.edu (Frank Mueller) writes:
>I disagree, I implemented a stripped-down version of preemtive Pthreads
>using library implementation techniques.


To clarify (summarizing from e-mail w/ Frank Mueller): a threads package
for code built with the standard C compiler needs to trap to the kernel to
flush the windows on a thread context swap.


The thread scheduling decisions and saving and restoring of ``obvious''
processor state are done in the user space. Thus, the threads package can
be considered user-space, and can be customized and optimized for the
application, etc. However, the kernel trap is still needed, so I consider
the SPARC threads packages I've written to be not truly user-space.


;-D oN ( A terminology-space threads package ) Pardo
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