[log4perl-devel] Synchronized appender errors for multiple processes

[Robert J. <yad...@sn...>]

I posted this problem in August last year, but I never got a solution...

I'm getting some errors when use the Synchronized appender.  My 
"real" program inits Log4Perl, then forks one or more children to do 
the work.  The parent then just monitors the children (like a good 
parent does, right? :)  ).  I have a SIGTERM handler defined in the 
parent.  When I SIGTERM the parent, I get a bunch of errors (shown 
below) for removal of the semaphore.  I'm guessing that one process 
removes the semaphore before the others are done with it.  Perhaps 
IPC::Shareable is calling DESTROY multiple times (one for each 
process using that semaphore?)

Below is a simple test case which generates the semaphore errors. The 
errors only occur both of the following are true: 1) using the 
Synchronized appender, and 2) a SIGTERM handler is defined

To reproduce the problem, start *at least 2* instances of the program 
below in the background, then kill all instances. When I do so, I see 
these errors:

Couldn't remove semaphore set 23789588: Identifier removed at 
source.pl line 0
Couldn't remove shared memory segment 23789588: Invalid argument at 
source.pl line 0


Thanks for your help!

---------------------------------------------------
#!/usr/bin/perl

use strict;

use Log::Log4perl qw(get_logger :levels);

$SIG{'TERM'} = \&quit;
sub quit;

#Initialize logger
Log::Log4perl->init(\q{
log4perl.rootLogger = DEBUG, SyncScreen
log4perl.appender.Screen = Log::Log4perl::Appender::Screen
log4perl.appender.Screen.layout = Log::Log4perl::Layout::SimpleLayout
log4perl.appender.SyncScreen = Log::Log4perl::Appender::Synchronized
log4perl.appender.SyncScreen.appender = Screen
});
my $logger = get_logger();
$logger->info("Starting.....");

while (1)
{
sleep (30);
}

sub quit
{
exit ();
}



-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Robert Jacobson               ..........................
Flight Ops. Team        Solar Dynamics Observatory (SDO)
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