jfjr@mbunix.mitre.org (05/10/91)
I have sent this out before and have seen nothing. I suspect
we are having site problems or maybe I am just being ignored
If I importune I am sorry.
My question: How are threads - light weight processes implemented
without going into the kernel - I beleive ISIS does this
Jerry Freedman,Jr
jfjr@mbunix.mitre.orglm@slovax.Eng.Sun.COM (Larry McVoy) (05/12/91)
jfjr@mbunix.mitre.org writes: > My question: How are threads - light weight processes implemented > without going into the kernel - I beleive ISIS does this The short answer to your question is (I think) that all threads will block when any of them enter the kernel & block. The longer answer is that anyone can write the context switching code in userland and allocate multiple stacks (I did this myself as a grad student just for grins; fun but mostly useless because of the blocking). There is some example code available on cs.arizona.edu in the sr subdir. Pick up the tar file, unpack, and look in rts. --- Larry McVoy, Sun Microsystems (415) 336-7627 ...!sun!lm or lm@sun.com