04-02-2014
You have shown us a picture showing 5 processes and have indicated that you are supposed to use pipes to communicate between those processes to negotiate which processes are allowed to run "critical" code.
You have shown us a short snippet of code that reads from and writes to what I presume are pipes, but there is no indication of how that I/O is being used for synchronization. From the code you have shown us, we don't know what is working, what isn't working, nor what help you're hoping to receive by posting here.
Please explain how the code you have shown us is supposed to fulfill your assignment and tell us what help you need.
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LEARN ABOUT NETBSD
debconf-mergetemplate
DEBCONF-MERGETEMPLATE(1) Debconf DEBCONF-MERGETEMPLATE(1)
NAME
debconf-mergetemplate - merge together multiple debconf template files
SYNOPSIS
debconf-mergetemplate [options] [templates.ll ...] templates
DESCRIPTION
Note: This utility is deprecated. You should switch to using po-debconf's po2debconf program.
This program is useful if you have multiple debconf templates files which you want to merge together into one big file. All the specified
files will be read in, merged, and output to standard output.
This can be especially useful if you are dealing with translated template files. In this case, you might have your main template file, plus
several other files provided by the translators. These files will have translated fields in them, and maybe the translators left in the
english versions of the fields they translated, for their reference.
So, you want to merge together all the translated templates files with your main templates file. Any fields that are unique to the
translated files need to be added in to the correct templates, but any fields they have in common should be superseded by the fields in the
main file (which might be more up-to-date).
This program handles that case properly, just list each of the translated templates files, and then your main templates file last.
OPTIONS
--outdated
Merge in even outdated translations. The default is to drop them with a warning message.
--drop-old-templates
If a translation has an entire template that is not in the master file (and thus is probably an old template), drop that entire
template.
SEE ALSO
debconf-getlang(1)
AUTHOR
Joey Hess <joeyh@debian.org>
2012-09-10 DEBCONF-MERGETEMPLATE(1)