On Fri, Oct 19, 2012 at 10:15 PM, Chuck Remes <[email protected]> wrote:

> It may be safe for inproc, but I never write code using this assumption. Any 
> change to the transport type breaks the application because the others are 
> all asynchronous.

The only place I use it (and it works very well there) is in thread
creation, together with PAIR sockets. In CZMQ we use this to create
"attached threads" that have a pipe back to the caller.

> This is a long-time and well-known flaw in the library. The inproc transport 
> is different and it causes problems when part of the marketing message in 
> zeromq says that you can start with in-process communication and effortlessly 
> scale out just by changing a single line of code.

True. Using inproc successfully relies on doing the binds before
creating child threads, whereas other transports don't.

-Pieter
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