NAME¶

gensio_tcl_funcs_alloc - Abstraction for some operating system functions done with tcl

SYNOPSIS¶

#include <gensio/gensio_tcl.h>

int gensio_tcl_funcs_alloc(struct gensio_os_funcs **o)

DESCRIPTION¶

This structure provides an abstraction for the gensio library that lets it work on top of tcl. See the tcl_os_funcs.3 man page for details on what this does. This can be used if you have a project based on tcl that you want to integrate gensio into.

Unfortunately, it has some limitations because of weaknesses in the tcl interface. Basically, no threads.

In tcl, if you start a timer, that timer will only fire in that thread's call to Tcl_DoOneEvent. Same with file handlers. Basically, timers, idle calls, and file handlers belong to a thread.

You could, theoretically, have multiple threads as long as you allocate an os handler per thread and did everything with an os handler only in the thread that created it. But that's not very useful.

If you really want real threading to work, you put tcl on top of gensio os funcs using Tcl_NotifierProcs. I leave that as an exercise to the reader.

RETURN VALUES¶

A gensio_err returns a standard gensio error.

SEE ALSO¶

gensio_os_funcs(3), gensio(5), gensio_err(3)