Calling Mathematica via MathLink multiple times

*To*: mathgroup at smc.vnet.net*Subject*: [mg44709] Calling Mathematica via MathLink multiple times*From*: jsu at caltech.edu (Julius Su)*Date*: Fri, 21 Nov 2003 05:13:31 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

Hello, I would to call Mathematica from within a C program to evaluate a lengthy function. (the reverse of the usual situation!) To do this I am using MathLink, and I have written a test program that successfully establishes a link with the kernel, calls the function, and returns the answer. When the program exits though, the link to the kernel dies and the kernel quits. Is there any way to keep the kernel alive between MathLink connections? This would be useful for storing persistent information, and for avoiding reinitializing certain routines before each function call. Possible (indirect) solutions: 1. I have used <<JLink` and the ShareKernel[] command to allow the kernel to switch between multiple links, but I would then need a way to (1) detect when connections are broken and create a new link and (2) tell my C program which port to connect under. 2. I could set up a program that connects once to the Mathematica kernel, then write another program that contacts the first via a message queue and semaphores. There must be a simpler way though! Thanks, Julius