driver_control and blocking process

Eric Merritt <>
Tue Aug 23 09:27:57 CEST 2005


It's not blocking on a file descriptor, its a lib generating
application specific events. There is an alternate api that allows for
polling events. However, I would much rather simply wait for events to
be generated rather then polling for them. I think the best way to
solve this would be to do a pipe based driver, but pipe performance on
windows is so dismal that I don't think its really an option.

On 23 Aug 2005 08:59:55 +0200, Bjorn Gustavsson <> wrote:
> It will block the VM.
> 
> You must use driver_select() to arrange for your driver to
> be called when somemthing happens with a file descriptor.
> (If you don't have a file descriptor, the standard trick is
> to create a pipe and pass the read end to driver to driver_select().)
> 
> /Bjorn
> 
> Eric Merritt <> writes:
> 
> > Guys,
> >
> >   I am working up a linked in driver using control that may block
> > waiting for external events. Control seemed to be the easiest to
> > implement by far. However, I h ave a worry that this will block the vm
> > as a whole. I thought it might be a good idea to ask the experts.
> >
> > Thanks,
> >   Eric
> >
> 
> --
> Björn Gustavsson, Erlang/OTP, Ericsson AB
>



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