Tom Lane 93407d3998 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) file
descriptors to support N backends.  Tests suggest it's about a wash for
small installations, but large ones would have a problem.
2007-09-26 00:32:46 +00:00
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