Re: Latch implementation that wakes on postmaster death on both win32 and Unix

This patch breaks silent_mode=on. In silent_mode, postmaster forks early
on, to detach from the controlling tty. It uses fork_process() for that,
which with patch closes the write end of the postmaster-alive pipe, but
that's wrong because the child becomes the postmaster process.

On a stylistic note, the "extern" declaration in unix_latch.c is ugly,
extern declarations should be in header files. Come to think of it, I
feel the Init- and ReleasePostmasterDeathWatchHandle() functions should
go to postmaster.c. postmaster_alive_fds[] and PostmasterHandle serve
the same purpose, declaration and initialization of both should be kept
together, perhaps by moving the initialization of PostmasterHandle into
Init- and ReleasePostmasterDeathWatchHandle().

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com