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Thomas Munro 197e4af9d5 Refactor pid, random seed and start time initialization. ... Background workers, including parallel workers, were generating the same sequence of numbers in random(). This showed up as DSM handle collisions when Parallel Hash created multiple segments, but any code that calls random() in background workers could be affected if it cares about different backends generating different numbers. Repair by making sure that all new processes initialize the seed at the same time as they set MyProcPid and MyStartTime in a new function InitProcessGlobals(), called by the postmaster, its children and also standalone processes. Also add a new high resolution MyStartTimestamp as a potentially useful by-product, and remove SessionStartTime from struct Port as it is now redundant. No back-patch for now, as the known consequences so far are just a bunch of harmless shm_open(O_EXCL) collisions. Author: Thomas Munro Reviewed-by: Tom Lane Discussion: https://postgr.es/m/CAEepm%3D2eJj_6%3DB%2B2tEpGu2nf1BjthCf9nXXUouYvJJ4C5WSwhg%40mail.gmail.com		8 years ago
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autovacuum.h	Log when a BRIN autosummarization request fails	8 years ago
bgworker.h	Add comment explaining BGWORKER_BYPASS_ALLOWCONN	8 years ago
bgworker_internals.h	Update copyright for 2018	9 years ago
bgwriter.h	Update copyright for 2018	9 years ago
fork_process.h	Update copyright for 2018	9 years ago
pgarch.h	Update copyright for 2018	9 years ago
postmaster.h	Refactor pid, random seed and start time initialization.	8 years ago
startup.h	Update copyright for 2018	9 years ago
syslogger.h	Implement "pg_ctl logrotate" command	8 years ago
walwriter.h	Update copyright for 2018	9 years ago