I have migrated a Perl script running under Linux/Apache that runs (which has no issues) to Windows Server 2008/IIS7. The program calls an external process by the following means:

open($R, "|C:/Progra~1/R/R-2.11.0-x64/bin/R CMD BATCH " . $R_FILE) or die $!;

What appears to be happening is that the following lines of code are being executed before the R script finishes executing. I have read some articles on various ways to make code wait but I haven't found a working solution. Not an experienced Perl programmer, I am hoping for some recommendations. I have analysed the http traffic and it appears that there is some kind of timing problem and there are no errors in the server logs.

In reply to Execution of external process does not wait in IIS7/Windows by lintunen

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