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Tom Lane bedb78d386 Implement sharable row-level locks, and use them for foreign key references ... to eliminate unnecessary deadlocks. This commit adds SELECT ... FOR SHARE paralleling SELECT ... FOR UPDATE. The implementation uses a new SLRU data structure (managed much like pg_subtrans) to represent multiple- transaction-ID sets. When more than one transaction is holding a shared lock on a particular row, we create a MultiXactId representing that set of transactions and store its ID in the row's XMAX. This scheme allows an effectively unlimited number of row locks, just as we did before, while not costing any extra overhead except when a shared lock actually has to be shared. Still TODO: use the regular lock manager to control the grant order when multiple backends are waiting for a row lock. Alvaro Herrera and Tom Lane.		21 years ago
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Makefile	$Header: -> $PostgreSQL Changes ...	22 years ago
prepjointree.c	Implement sharable row-level locks, and use them for foreign key references	21 years ago
prepqual.c	Rethink the order of expression preprocessing: eval_const_expressions	21 years ago
preptlist.c	Implement sharable row-level locks, and use them for foreign key references	21 years ago
prepunion.c	Merge Resdom nodes into TargetEntry nodes to simplify code and save a	21 years ago