Re: Request for swapcontext and getcontext to be ported to our libc

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

Matthew Dillon wrote:
>     The answer is: yes, it is possible.  There is no reason why the
>     signal mask (and signal pending bitmap) couldn't be stored in user
>     memory, allowing the userland threading system to swap out the mask
>     without entering the kernel.  

I absolutely agree.  I am thinking of a special page mapped in kernel and userspace memory, where things like signal mask and pending (per thread) are located, and maybe also a timecounter, pid, etc.

>     So I think there is a very good argument for making the current release
>     implementation do these calls in libc and not as system calls, and
>     initially have libc just get the signal mask with a system call, then
>     at some later date add the feature sthat allow the userland context
>     routines to run fully without having to make any system calls at all.

If Matt Emmerton finds the time to implement it, I am all for it.  Having these functions as syscalls seems wrong in my eyes.

cheers
 simon

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