pid gets overwritten in OSX

Hi,

I'm running Postgres on Mac OSX (10.1.4). Every once in a while, I
get the following problem: for some reason the postmaster seems to
stop running postgres. When I look at the pid attributed to postgres
(in postmaster.pid) and check it against ps -aux, I see that either
the process doesn't exist anymore or that it has been overwritten by
some other program (e.g. MySQL). It's not a big problem since it is
enough to restart for the pids to get sorted (just once the problem
happened twice in a row), but does anyone have an idea how I could
avoid this?

Thanks.

--------
François

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