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Re: Mutex optimization for uncontested cases


Luoqi Chen wrote:
> 
> I have noticed very poor performance of stdio stream under eCos, about 4 times
> slower than vxworks. Howerver I was able to improve the performance by a factor
> of 2 by disabling the CYGSEM_LIBC_STDIO_THREAD_SAFE_STREAMS option. This points
> to an inefficiency in the current mutex implementation that we do not optimize
> for the most common cases of uncontested mutex acquisitions. I wonder if eCos
> developers are aware of this problem and if there is any effort under way
> trying to resolve it.

That's not a priority for us right now. It's open source, so patches
welcome! Bear in mind that atomic test and set type operations aren't
portable :-|.

Jifl
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