e615605239
This reverts commit b9515b62879722e3497236f6e0d6783c3fc059a2. Buildfarm results suggest that some platforms have versions of pselect(2) that are not merely non-atomic, but flat out non-functional. Revert the use-pselect patch to confirm this diagnosis (and exclude the no-SA_RESTART patch as the source of trouble). If it's so, we should probably look into blacklisting specific platforms that have broken pselect. Discussion: https://postgr.es/m/9696.1493072081@sss.pgh.pa.us
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