# ./showflaw.pl
main: creating new empty database
main: forking threads and waiting for them
thread_a: pid 6308
thread_a: attempting to open db and get lock
thread_a: waiting five seconds
thread_b: pid 6309
thread_b: waiting three seconds
thread_b: attempting to open db and get lock
thread_a: writing 2000 records to the database
thread_a: dumping database to foo.db.dump01
thread_a: releasing lock
thread_b: dumping database to foo.db.dump02
thread_a: exiting
thread_b: writing 400 records to the database
thread_b: dumping database to foo.db.dump03
thread_b: releasing lock
thread_b: exiting
main: opening and dumping database to foo.db.dump04
main: exiting

# wc -l foo.db.*
   2001 foo.db.dump01
   1000 foo.db.dump02
   1400 foo.db.dump03
   1400 foo.db.dump04
   5801 total

# rm foo.db

# uname -a
Linux hobbes.drh.net 2.2.9-27mdk #1 Mon Jun 14 16:44:05 CEST 1999 i586 unknown

(note: the system is actually Red Hat 6.0 with a Mandrake kernel tossed in)