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The file is opened  in  append  mode.  Before  each
write, the file pointer is positioned at the end of
...
is  because  NFS  does  not  support appending to a
file, so the client  kernel  has  to  simulate  it,
which can't be done without a race condition

Opening a file with append mode (a as the first character in
the  mode argument) causes all subsequent writes to the file
...
to  the file without fear of destroying output being written
by the other.  The output from the  two  processes  will  be
intermixed in the file in the order in which it is written.