| From: | Ian Lance Taylor <ian(at)airs(dot)com> |
|---|---|
| To: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: MIPS test-and-set |
| Date: | 2001-03-27 05:18:43 |
| Message-ID: | sig0fzzt58.fsf@daffy.airs.com |
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| Thread: | |
| Lists: | pgsql-general pgsql-hackers |
ncm(at)zembu(dot)com (Nathan Myers) writes:
> Since the actual instruction sequence is probably lifted from the
> MIPS manual, it's probably much freer than GPL. For the paranoid,
> the actual instructions, extracted, are just
>
> 1:
> ll %0,%3
> bnez %0,2f
> li %1,1
> sc %1,%2
> beqz %1,1b
> 2:
But note that the ll instruction is MIPS ISA II, which means that it
is not supported by the R3000, which means that it will not work on
most DECstations.
I don't think there is any way to do a reliable test-and-set sequence
in user mode on an R3000.
Ian
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