NAME

       runlock - prevent concurrent execution of a process

SYNOPSYS

       runlock [ -h ]

       runlock [ -d ] [ -f pathname ] [ -t timeout ] command [ args ]

DESCRIPTION

       runlock tries to hold an exclusive lock while it executes a command. Subsequent execution of runlock with
       the same lock, while that lock is held, will cause the new  instance  of  runlock  to  terminate  with  a
       faliure exit code. Otherwise, the exit code of the subprocess is returned.

USAGE

       -d

              Debug mode; send log messages to standard error as well as to the system log.

       -f pathname

              Specifies the pathname of the file to use as a lock file.  The default is to create a lock file in
              /tmp/cronutils-$USER with the name of the command, and suffix ".pid".

       -t timeout

              Specifies the duration, in seconds, for runlock to wait before giving up on trying to acquire  the
              lock.  The default is 5 seconds.

       -h

              Prints some basic help.

BUGS

       Sending SIGALRM to runlock before the timer has expired will cause the subprocess to be killed.

SEE ALSO

       runalarm(1), runstat(1)

AUTHOR

       runlock was written by Jamie Wilkinson <jaq@google.com>.

COPYRIGHT

       This program is copyright (C) 2010 Google, Inc.

       It is licensed under the Apache License, Version 2.0