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Use SYSV semaphores rather than POSIX on Darwin >= 6.0 (i.e., OS X 10.2

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and up), per Chris Marcellino.  This avoids consuming O(N^2) file
descriptors to support N backends.  Tests suggest it's about a wash for
small installations, but large ones would have a problem.
This commit is contained in:
Tom Lane 2007-09-26 00:32:46 +00:00
parent f828f878e9
commit 93407d3998
1 changed files with 13 additions and 3 deletions
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16
src/template/darwin
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@ -1,8 +1,18 @@
# $PostgreSQL: pgsql/src/template/darwin,v 1.10 2006/03/11 04:38:40 momjian Exp $
# $PostgreSQL: pgsql/src/template/darwin,v 1.11 2007/09/26 00:32:46 tgl Exp $
# Apple's cpp-precomp seems a tad broken, so don't use it
# (Note: on OS X before 10.2, you might need -traditional-cpp instead)
CC="$CC -no-cpp-precomp"
# Select appropriate semaphore support
USE_NAMED_POSIX_SEMAPHORES=1
# Select appropriate semaphore support. Darwin 6.0 (Mac OS X 10.2) and up
# support System V semaphores; before that we have to use POSIX semaphores,
# which are less good for our purposes because they eat a file descriptor
# per backend per max_connection slot.
case $host_os in
darwin[015].*)
USE_NAMED_POSIX_SEMAPHORES=1
;;
*)
USE_SYSV_SEMAPHORES=1
;;
esac