Bash "Co-process" example Post: 50179

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Top Forums Shell Programming and Scripting Bash "Co-process" example Post 50179 by home_king on Sunday 18th of April 2004 08:57:15 AM

04-18-2004

Registered User

Bash "Co-process" example

It copys one specified file to multiple "unique"(filter those different pathnames which in fact point to the same physical path) paths with parallelism in bash. In contrast to sequential copy processes, it performs well under multiprocessor systems.
The efficiency of Co-process is normally determined by three factors:
1.Whether CPU bound or not
2.Whether scientific data processing or not
3.Whether I/O or not

Code:

#!/bin/sh
# 
# Written by home_king <home_king@163.com>
# mcp---Multiple copy with Co-Process
# command format:
# mcp filename pathname1 pathname2 ... pathnameN
#
checkargs(){
        if [ $# -eq 0 ];then
                echo 'No arguments supplied!'
                return 1
        fi
        cpfile=$1
        if [ ! -f $cpfile ]; then
                echo 'Invaild file to copy!'
                return 1
        fi
        shift
        for tmparg in "$@"; do
                if [ ! -d $tmparg ];then
                        echo "There's at least one invalid directory"
                        return 1
                fi
        done
        argnums=($(echo $(stat -Lc %i $@) | awk -v inum=$(stat -c %i $PWD) '{for(i=1;i<=NF;i++){if($i == inum)continue;ldirs[$i]=i}} END{for(item in ldirs){print ldirs[item]}}'))
}

checkargs $@
[ $? -eq 0 ] || exit 1
shift

echo "Destination:"
for arg in "${argnums[@]}"; do
        eval echo '$'$arg
        eval cp -f $cpfile '$'$arg &
done
wait
echo ""
echo 'All done!'

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Last edited by home_king; 04-18-2004 at 10:16 AM..

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LEARN ABOUT XFREE86

libbash

LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME

     libbash -- A bash shared libraries package.

DESCRIPTION

     libbash  is  a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
     want to load and use in scripts of your own.

     It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.

     Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1).  A bash shared library that can be  loaded
     using
     ldbash(1) must answer 4 requirments:

     1.     It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).

     2.     It must contain a line that begins with '#EXPORT='.  That line will contain (after the '=') a list of functions that the library
	    exports.  I.e. all the function that will be usable after loading that library will be listed in that line.

     3.     It must contain a line that begins with '#REQUIRE='.  That line will contain (after the '=') a list of bash libraries that are
	    required for our library.  I.e. every bash library that is in use in our bash library must be listed there.

     4.     The library must be listed (For more information, see ldbashconfig(8)).

   Basic guidelines for writing library of your own:
     1.     Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.

     2.     Try to declare all variables intended for internal use as local.

     3.     Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
		  __<library_name>_
	    For example, internal function myfoosort of hashstash library should be named as
		  __hashstash_myfoosort
	    This helps to avoid conflicts in global name space when using libraries that come from different vendors.

     4.     See html manual for full version of this guide.

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <ril@ran4.net>

SEE ALSO

     ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)

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