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Commitf2857af

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Use unnamed POSIX semaphores on Cygwin.
Testing on CI showed that Cygwin's semctl() can fail with EAGAIN(possibly due to resource limits in cygserver that could be tuned, notexamined). Switch to so-called POSIX semaphores instead, which don'tseem to fail in that way (possibly due to a more direct implementationusing Windows semaphore primitives instead of talking to cygserver,based on a cursory glance at the source).Other known problems still prevent PostgreSQL from running on Cygwinwithout random crashes, but this rarer problem was noticed whiletesting.Discussion:https://postgr.es/m/CA%2BhUKG%2BQ6DU4Ov9LrvUyDcF3oHS4KMRVSKmVGaeePq-kOyG9gA%40mail.gmail.com
1 parent39cffe9 commitf2857af

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‎meson.build

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@@ -211,6 +211,7 @@ if host_system == 'aix'
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memset_loop_limit=0
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elif host_system=='cygwin'
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sema_kind='unnamed_posix'
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cppflags+='-D_GNU_SOURCE'
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dlsuffix='.dll'
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mod_link_args_fmt= ['@0@']

‎src/template/cygwin

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# src/template/cygwin
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# Prefer unnamed POSIX semaphores if available, unless user overrides choice
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if test x"$PREFERRED_SEMAPHORES" = x"" ; then
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PREFERRED_SEMAPHORES=UNNAMED_POSIX
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fi
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SRCH_LIB="/usr/local/lib"
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# This is required for ppoll(2), and perhaps other things

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