How to synchronize the one subroutine

kkavitha has asked for the wisdom of the Perl Monks concerning the following question:

I have a subroutine which is interact with external file. How to make I this subroutine to synchronize? I am using in the following.

Example: $isAllowed = checkAndAllowed($pdt);

This checkAndAllowed($pdt) subroutine will rewrite the content of external file

If anyone knows, please share it here

Thanks in Advance, Kavitha

Comment on How to synchronize the one subroutine

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Re: How to synchronize the one subroutine by cdarke (Prior) on Sep 11, 2009 at 11:17 UTC
I'm not sure exactly what you are looking for. What is it that you want to synchronize your subroutine with? Maybe you want to flush the buffers of the external file? Look at $\| in perlvar, but closing the file would do that. Maybe you have other scripts you need to synchronise with. Look at flock (UNIX/Linux) or Win32::Mutex (Windows), or maybe other IPC mechanisms.	[reply]
Re^2: How to synchronize the one subroutine by ikegami (Patriarch) on Sep 11, 2009 at 14:08 UTC
`flock` works fine on Windows too	[reply] [d/l]
Re^2: How to synchronize the one subroutine by kkavitha (Initiate) on Sep 22, 2009 at 05:51 UTC
Thanks for your information One of the subroutine of our tool is exposed with external file like writing, rewriting, remove entry. Currently, when multiple user tried to use this tool at the same time, external file content has changed irrelevently. My requirement, external file should be edit by only one user at a time	[reply]
Re: How to synchronize the one subroutine by Anonymous Monk on Sep 11, 2009 at 11:25 UTC
How to make I this subroutine to synchronize? Spawn a thread (perlthrtut) or a new process ( Proc::Background )	[reply]