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List:       netbsd-users
Subject:    Re: pthreads condition variables
From:       raymond.meyer () rambler ! ru
Date:       2009-11-19 14:52:25
Message-ID: 20091119145225.f3652c36.raymond.meyer () rambler ! ru
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On Thu, 19 Nov 2009 15:28:16 +0100
Jean-Yves Migeon <jeanyves.migeon@free.fr> wrote:

> Something like:
> while (atomic_cas(...there_is_nothing_to_do...))
>     sched_yield();

How does atomic_cas affect performance? If machine supports hadware cas
instruction, does it suspend all cores/processors from fetching data
because it locks address/data bus, or does it suspend only those
cores/processors which are trying to read/modify the same address on
which cas is operating at that time instance?
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