Re: [boost] [context review] Several Questions

Subject: Re: [boost] [context review] Several Questions
From: Oliver Kowalke (oliver.kowalke_at_[hidden])
Date: 2011-03-21 09:14:31

> > sched_yield(): 2108 cycles
> > ucontext_t:    1795  cycles
> > fcontext_t:     156 cycles
> > 

> Actually it is quite consistent with what you had show,
> the Boost.Context is better (but not significantly) then
> real OS (kernel) context switch.

factor 13x ?

> It would be very useful to see real usability cases. Because otherwise
> it is hard to estimate usefulness of this library

The lib is intended to be a building block for higher abstractions like coroutines.

> I understand, it may be useful for "yeild" like iterators and so
> but it is not clear how does it work and what is the advantage
> in comparison to ordinary event driven approach.

I remember that factor (http://factorcode.org/) does context switching for its internal working.

You can preserve local data:

void myfunc()
{
   for ( int i = 0; i< 10; ++i)
   {
      if ( 5 == i)
yield();

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