have you tried fcntl?
logfile = open(LOGFILE, 'w')
#fileno() returns the file descriptor of opened file,
#lock_ex for exclusive locking, the other process waits for file to
unlock before proceeding. (if the file is locked already). you don't
have to lock the LOGFILE, lock a new file, as long as it's locked, other
processes won't be able to write to LOGFILE.
fcntl.flock(logfile.fileno(), fcntl.LOCK_EX)
#code for writing to file.... blahblah....
#unlock file
fcntl.flock(logfile.fileno(), fcntl.LOCK_UN)
logfile.close()
Martin Kaufmann wrote:
> Could somebody help me? I have a script that writes its output in a
> logfile. This logfile is needed to check whether a task has already be
> done. Several workstations are now using the same script (via nfs). So I
> implemented the following file locking mechanism:
>
> logfile = posixfile.open(LOGFILE, 'a')
> logfile.lock('|w')
> [code snipped...]
> log_string = '%s %s%s %d %s %s\n' % (mytime, host, url,
> error_code, message, hostname)
> logfile.write(log_string)
> logfile.lock('u')
> logfile.close()
>
> But I still get problems with two processes trying to write at the same
> time. What is wrong with my implementation?
>
> Thanks for your help.
>
> Regards,
>
> Martin
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