Re: [Help-glpk] Node.js native module

[Henri Gourvest]

Hi Heinrich,

Actually Node.js is not multithreaded, I would suggest you to read this
good article on the event driven architecture:
https://nodesource.com/blog/understanding-the-nodejs-event-loop
So currently, this Node.js binding don't have to be threadsafe.

The big next step is to make MIP solver async, and you right there will
be a thread-safety problem, and I will have to make some internal
changes to GLPK.

About the error hook function, I missed this point, and I will make an
update ASAP.

Best regards


Le 28/05/2015 06:34, Heinrich Schuchardt a écrit :
> Hello Henri,
> 
> GLPK is not thread safe. Node.js uses multiple threads from a thread
> pool to serve multiple requests. You should provide a locking mechanism.
> 
> Furthermore GLPK-calls may need several minutes to return. So in Node.js
> GLPK should be called asynchronously like a slow IO.
> 
> If an error occurs in GLPK it will terminate the complete process. You
> should provide an error hook function to handle errors gracefully.
> Otherwise the whole Node.js server will go down in an error situation.
> 
> Best regards
> 
> Heinrich Schuchardt
> 
> 
> 
> 
> Henri Gourvest <address@hidden>schrieb:
> 
>     Hi,
> 
>     This is a native module for GLPK.
>     You now can run GLPK on server side, or just make scripts.
>     Working on Windows, Linux and Mac.
>     It is also a good opportunity to create a crossplatform IDE using
>     node-webkit.
> 
>     https://github.com/hgourvest/node-glpk
> 
>     *Install*
> 
>     npm install glpk
> 
>     *Example*
> 
>     var glp = require("glpk");
>     var prob = new glp.Problem();
>     prob.readLp("todd.lpt");
>     prob.scale(glp.SF_AUTO);
>     prob.simplex({presolve: glp.ON});
>     if (prob.getNumInt() > 0){
>     function callback(tree){
>     if (tree.reason() == glp.IBINGO){
>     // ...
>     }
>     }
>     prob.intopt({cbFunc: callback});
>     }
>     prob.delete();
> 
> 
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