I need a way to write online messages to the concurrent program log

Hi ,

 I defined a concurrent program that calls a PL-SQL stored procedure I developed. I write messages to
the concurrent program log using the following code :

fnd_file.put_line(fnd_file.log,'my message');

The problem is : these messages do not appear in the log untill the concurrent program completes
execution. I need these messages to appear in the log as soon as I send them to
the log using the above code is executed (so that I can figure out the progress
of execution)

Thanks in advance