Re: [boost] C function adaptor.

From: Steven Watanabe (steven_at_[hidden])
Date: 2007-04-20 18:16:21

AMDG

Rene Rivera <grafikrobot <at> gmail.com> writes:

> 
> Sohail Somani wrote:
> >> Steven Watanabe wrote:
> >>> It's not thread safe and the only way I can
> >>> see to make it so is to have a fixed set
> >>> of functions and allocate/deallocate
> >> Why would it need to be thread safe? Usually one puts thread safety 
> >> above this kind of utility layer.
> > 
> > Well if you need to implement a C-callback that doesn't have a void *
> > data argument.
> 
> You put the thread safety in what the c-function calls. Now if the 
> question really is that the setting of the function object instance 
> isn't thread safe... You would make the code that calls make_c_function 
> thread safe, by using locks for example. Note, calling the c-function, 
> and hence the function object, is thread safe AFAIK.
> 

That isn't what I meant.  If

void(*f)();
{
scoped_lock lock(m);
f = make_c_function(...);
}
use f

were sufficient I wouldn't have a problem.

Unfortunatly, it is necessary to retain the lock
until you are done with f.

In Christ,
Steven Watanabe