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This commit adds a new "void *arg" parameter to GetNamedDSMSegment() that is passed to the initialization callback function. This is useful for reusing an initialization callback function for multiple DSM segments. Author: Zsolt Parragi <zsolt.parragi@percona.com> Reviewed-by: Sami Imseih <samimseih@gmail.com> Discussion: https://postgr.es/m/CAN4CZFMjh8TrT9ZhWgjVTzBDkYZi2a84BnZ8bM%2BfLPuq7Cirzg%40mail.gmail.com