10 May
1999
10 May
'99
11:05 a.m.
"Adam 'WeirdArms' Wiggins" awiggins@cse.unsw.edu.au writes:
I think they were seperate in the Intel for efficiency reasons,
Yes, that's right: The way the bits are laid out in thread ids, it takes the kernel only one AND and one OR to compute the address of the thread control block; no shifts or lookups necessary. (Fiasco actually currently adds a shift because the kernel stack contained in the thread control blocks is larger to accommodate for the fact that higher-level languages need more stack space.)
Michael
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