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#!/usr/bin/env perl

...

    close $pipe_reader;
}

#!/usr/bin/env perl

...
        }
    }
}

package PM_1133400_Shared;

...
sub remove_fifo { unlink FIFO if -e FIFO }

1;

pm_1133400_sim_sql.pl & pm_1133400_sim_web.pl

WEB_SIM: FIFO Unavailable! Queueing step [5].
SQL_SIM: Executing normal step: Step 0
...
WEB_SIM: FIFO Available! Piping from queue [5]
...
SQL_SIM: Executing web request: Step 5

SQL_SIM: Executing normal step: Step 0
SQL_SIM: Executing normal step: Step 1
...
SQL_SIM: Executing normal step: Step 5
SQL_SIM: Executing normal step: Step 6
...