I posted an announcement some time back on comp.lang.ada. about the latest 
PLplot release. (FWIW, it currently has 182 views, and I got some useful 
feedback from the Ada gurus.)

Today this post (below) appeared. I don't know how to answer his question about 
thread safety. Any thoughts?

Jerry




Hi Jerry, 

That looks really interesting. 

I'm looking for a plotter routine that could be used safely inside the AWS [= 
Ada Web Server] web server, so I can implement a 'callback' chart server 
(currently I have one written in Java). 

Could this be used for that? Some simple tests suggest to me that it isn't 
thread safe. The  Initialize_PLplot [aka plinit] and associated procedures to 
set filenames, etc, seem to set global variables somewhere. Is there some trick 
I'm missing? 

It does make lovely looking charts. 

thanks very much for this. 

Graham 
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