Re: [boost] Persistency library

Subject: Re: [boost] Persistency library
From: Lifshitz, Yair (yair.lifshitz_at_[hidden])
Date: 2011-09-26 03:27:30

> > > I assume resuming from a checkpoint would also require to restore 
> > > the registers, flags, stack (pointer), instruction pointer etc. - 
> > > I'd like to know if your lib supports only intel or some other architectures too.
> > > 
> > > Oliver
> > 
> > Your assumption is correct.
> > However, the actual implementation is done via 
> > getcontext()/setcontext(), so it is not hard-wired to a specific hardware architecture.
>
> You know that ucontext-stuff (getcontext()/setcontext()/swapcontext()/makecontext()) is deprecated by POSIX 2003 and removed by POSIX 2008?
> For instance glibc doesn't implement those functionality on ARM.
>
> I don't know your implementation but on x86_64 the makecontext() function of glibc can not handle pointers as arguments (var-args for makecontext()).
> comment from makecontext.c (glibc-2.14): 'This implementation currently only handles integer arguments.'
> If you want to pass a pointer to the context-function via makecontext() you get a truncated address.
>
> Oliver

I was unaware of this. My implementation does not rely on varags in makecontext().
Practically, it is possible to achieve the same flexibility by using setjmp()/longjmp() with minor effort.

I believe this is common enough and supported on all platforms.

Yair
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