write to the same file from multiple processes at the same time?

[Piet van Oostrum]

Isn't a write to a file that's opened as append atomic in most operating
systems? At least in modern Unix systems. man open(2) should give more
information about this.

Like:
f = file("filename", "a")
f.write(line)
f.flush()

if line fits into the stdio buffer. Otherwise os.write can be used.

As this depends on the OS support for append, it is not portable. But
neither is locking. And I am not sure if it works for NFS-mounted files.
-- 
Piet van Oostrum <piet at cs.uu.nl>
URL: http://www.cs.uu.nl/~piet [PGP]
Private email: piet at vanoostrum.org