Re: finer grained threading?

[Christopher Quinn <cq@htec.demon.co.uk>]

Ah!  As suspected I am not the first to think about this!  I have just 
found a DECthreads page mentioning upcalls and the ability to switch 
threads on a page fault event.

Is it correct to say LinuxThreads(pthreads impl.) cannot offer this feature?
Any suggestions for alternative thread packages for linux that do?

cheers,
chris Q.


Christopher Quinn wrote:
> hi list,
> 
> I have been wondering about what happens to a locked resource within a 
> set of kernel threads when the holding thread causes a page fault, say 
> via touching a page of a mmap'ed file.
> 
> As far as I can see, there is no system call API means for the 
> thread/process to take remedial action when this I/O delay occurs -
> ie. it could be useful for the holding thread to yield its lock on the 
> resource, allowing other threads to progress while it sleeps.
> 
> Does anyone know otherwise?
> 
> Is there any mechanism in the kernel allowing notification of a page 
> fault event (or indeed other I/O related events) to be received by, say, 
> some code encapsulated in a kernel module? ie. would writing a kernel 
> module be any sort of option for me?
> 
> hope that's clear.
> thanks,
> chris Q.
> 
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-- 
rgrds,
Chris Quinn