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Full Discussion: concurrency issue while Accessing Mail Box from shell script
Top Forums UNIX for Advanced & Expert Users concurrency issue while Accessing Mail Box from shell script Post 302108237 by Sumit_Fundoo on Sunday 25th of February 2007 07:42:16 AM
Old 02-25-2007
concurrency issue while Accessing Mail Box from shell script
Hi Bros,

I am in a serious trouble with concurrency issue while using mailx. I have a shell script which reads all the emails of a unix user account and create a copy (another mbox for processing and archive purpose). This script works fine for 99.99% of the time but sometime it start creating multiple copies of the same email during creation of another temp mail box copy and subsequently results in large repetitive insert database calls.

This email loading shell script is a regular cron job which runs after every 30 minutes. My doubts goes to somebody running mailx command or reading email of the same user account while Email Loader is running. Am i correct with my doubt ? Is there anyways to explicit lock the unix user mailbox while my Email Loader program is running ? please advise if i am wring somewhere in script.

I am also providing code snippet here -
# Functions for checking whether there is any emails in user mailbox - returns 0 in variable mailstat if there are new emails in mailbox otherwise 1.

Code:
check_mailbox()
{
 if [ "$mailfile" = "" ]; then  
    mailx -e
 else
   #mailx -e -f $mailfile
    if [ -f "$mailfile" ]; then  
       mailstat=0
     else
       mailstat=1
    fi
 fi
 mailstat=$?
} # check_mailbox  

#### main Block which is running and creating a copy of all mails in users mailbox.


------------
/* mail file is always blank as we never pass any argument to script.*/
mailfile="$1"  

echo "Test to see if there is mail. Exit status will be 0 if there is." >> $logfile
check_mailbox
if [ $mailstat -eq 1 ]; then
   echo "No mails exist in mailbox" >> $logfile
   exit 1
fi

echo "Archiving Mailbox." >> $logfile
touch  ${mailboxarchive} 

while ( [ $mailstat -eq 0 ] )
do
  echo "save ${mailboxarchive}
        quit" > $exmailfl
  if [ "empty$mailfile" = "empty" ]; then
     mailx < $exmailfl > $outfile
  else
    if [ ! -f $mailfile ]; then
      # all done
       break
    fi
    mailx -f $mailfile < $exmailfl > $outfile
  fi
  check_mailbox
done


anybody have any clue on where i am doing foolish act ? any help bros

looking forward for some unix experts help (i m a j2ee guy and don't have that depth in Unix schell scripting)

Thx in well advance.
Sumit
Last edited by Perderabo; 02-25-2007 at 12:58 PM.. Reason: Add code tags for readability
 

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LEARN ABOUT SUNOS

thr_getconcurrency

thr_getconcurrency(3C)					   Standard C Library Functions 				    thr_getconcurrency(3C)

NAME

       thr_getconcurrency, thr_setconcurrency - get or set thread concurrency level

SYNOPSIS

       cc -mt [ flag... ] file...[ library... ]

       #include <thread.h>

       int thr_setconcurrency(int new_level);

       int thr_getconcurrency(void);

DESCRIPTION

       These  functions  are  obsolete	and  maintained for compatibility only.  The thr_setconcurrency() function updates the desired concurrency
       level that libthread maintains for the calling process. This value does not affect the behavior of the calling process.

       The thr_getconcurrency() function returns the current value for the desired concurrency level.

RETURN VALUES

       The thr_getconcurrency() function always returns the current value for the desired concurrency level.

       If successful, the  thr_setconcurrency() function returns  0. Otherwise, a non-zero value is returned to indicate the error.

ERRORS

       The  thr_setconcurrency() function will fail if:

       EAGAIN	       The specified concurrency level would cause a system resource to be exceeded.

       EINVAL	       The value for new_level is negative.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       thr_create(3C), attributes(5), standards(5)

SunOS 5.10							    11 May 1998 					    thr_getconcurrency(3C)
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