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Commit93407d3

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Use SYSV semaphores rather than POSIX on Darwin >= 6.0 (i.e., OS X 10.2
and up), per Chris Marcellino. This avoids consuming O(N^2) filedescriptors to support N backends. Tests suggest it's about a wash forsmall installations, but large ones would have a problem.
1 parentf828f87 commit93407d3

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‎src/template/darwin

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# $PostgreSQL: pgsql/src/template/darwin,v 1.10 2006/03/11 04:38:40 momjian Exp $
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# $PostgreSQL: pgsql/src/template/darwin,v 1.11 2007/09/26 00:32:46 tgl Exp $
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# Apple's cpp-precomp seems a tad broken, so don't use it
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# (Note: on OS X before 10.2, you might need -traditional-cpp instead)
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CC="$CC -no-cpp-precomp"
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7-
# Select appropriate semaphore support
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USE_NAMED_POSIX_SEMAPHORES=1
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# Select appropriate semaphore support. Darwin 6.0 (Mac OS X 10.2) and up
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# support System V semaphores; before that we have to use POSIX semaphores,
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# which are less good for our purposes because they eat a file descriptor
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# per backend per max_connection slot.
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case $host_os in
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darwin[015].*)
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USE_NAMED_POSIX_SEMAPHORES=1
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;;
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*)
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USE_SYSV_SEMAPHORES=1
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;;
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esac

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