Log Message:
-----------
Fix count_usable_fds() to stop trying to open files once it reaches
max_files_per_process. Going further than that is just a waste of
cycles, and it seems that current Cygwin does not cope gracefully
with deliberately running the system out of FDs. Per Andrew Dunstan.
Modified Files:
--------------
pgsql/src/backend/storage/file:
fd.c (r1.118 -> r1.119)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/file/fd.c.diff?r1=1.118&r2=1.119)