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Since commit a65e0864, we've required Unix systems to have sigprocmask(). As noted in that commit's message, we were still emulating the historical pre-standard sigsetmask() function in our Windows support code. Emulate standard sigprocmask() instead, for consistency. The PG_SETMASK() abstraction is now redundant and all calls could in theory be replaced by plain sigprocmask() calls, but that isn't done by this commit. Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/3153247.1657834482%40sss.pgh.pa.us