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Full Discussion: How to call a background process in perl?
Top Forums Shell Programming and Scripting How to call a background process in perl? Post 302543492 by vanitham on Monday 1st of August 2011 03:08:55 AM
Old 08-01-2011
How to call a background process in perl?
Hi,

I want to put the following code as a parallel or background process

The program is as below:
Code:
$n=10; #Count of files to be created. 
for($j=0;$j<=$n;$j++) {
open(FH,">files_$j.txt") || warn "cannot create a file\n";
{
print FH "count of file: $j\n"; #Sample data to be written. just an example.
system("mv files_$j.txt /home/backup/remove/files") #put the following code as a parallel or background process
}
close FH;
}

Is it possible to make the "mv" command i.e. moving the files from current working directory to other directory
to be independent of the main code?

The first file gets created and then the MV command gets called and file gets transfered again the next file
gets created and MV command is called and so on. As a sample data i have given the count to be written what if
there is huge amount of data (around few GB) to be written and transferred. It takes quite large amount of time.

How can i make the file copying as an indepenent process?
file1 gets created -> MV is called as an background process
file 2 gets created but MV will be called in parallel not as a dependent process

File creation should not wait for the MV command as an background process?

How can i do it in Perl?

Regards
Vanitha
 

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LEARN ABOUT NETBSD

wait

WAIT(1) 						    BSD General Commands Manual 						   WAIT(1)

NAME

     wait -- await process completion

SYNOPSIS

     wait [pid]

DESCRIPTION

     If invoked with no arguments, the wait utility waits until all existing child processes in the background have terminated.

     Available operands:

     pid     If a pid operand is specified, and it is the process ID of a background child process that still exists, the wait utility waits until
	     that process has completed and consumes its status information, without consuming the status information of any other process.

	     If a pid operand is specified that is not the process ID of a child background process that still exists, wait exits without waiting
	     for any processes to complete.

     The wait utility exits with one of the following values:

     0	     The wait utility was invoked with no operands and all of the existing background child processes have terminated, or the process
	     specified by the pid operand exited normally with 0 as its exit status.

     >0      The specified process did not exist and its exit status information was not available, or the specified process existed or its exit
	     status information was available, and it terminated with a non-zero exit status.

     If the specified process terminated abnormally due to the receipt of a signal, the exit status information of wait contains that termination
     status as well.

STANDARDS

     The wait command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BSD
								   June 5, 1993 							       BSD
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