David Howells wrote:
The attached patch introduces a simple mutex implementation as an alternative
to the usual semaphore implementation where simple mutex functionality is all
that is required.
This is useful in two ways:
(1) A number of archs only provide very simple atomic instructions (such as
XCHG on i386, TAS on M68K, SWAP on FRV) which aren't sufficient to
implement full semaphore support directly. Instead spinlocks must be
employed to implement fuller functionality.
We have atomic_cmpxchg. Can you use that for a sufficient generic
implementation?
--
SUSE Labs, Novell Inc.
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