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/*------------------------------------------------------------------------- * * lockoptions.h * Common header for some locking-related declarations. * * * Copyright (c) 2014-2016, PostgreSQL Global Development Group * * src/include/nodes/lockoptions.h * *------------------------------------------------------------------------- */ #ifndef LOCKOPTIONS_H #define LOCKOPTIONS_H /* * This enum represents the different strengths of FOR UPDATE/SHARE clauses. * The ordering here is important, because the highest numerical value takes * precedence when a RTE is specified multiple ways. See applyLockingClause. */ typedef enum LockClauseStrength { LCS_NONE, /* no such clause - only used in PlanRowMark */ LCS_FORKEYSHARE, /* FOR KEY SHARE */ LCS_FORSHARE, /* FOR SHARE */ LCS_FORNOKEYUPDATE, /* FOR NO KEY UPDATE */ LCS_FORUPDATE /* FOR UPDATE */ } LockClauseStrength; /* * This enum controls how to deal with rows being locked by FOR UPDATE/SHARE * clauses (i.e., it represents the NOWAIT and SKIP LOCKED options). * The ordering here is important, because the highest numerical value takes * precedence when a RTE is specified multiple ways. See applyLockingClause. */ typedef enum LockWaitPolicy { /* Wait for the lock to become available (default behavior) */ LockWaitBlock, /* Skip rows that can't be locked (SKIP LOCKED) */ LockWaitSkip, /* Raise an error if a row cannot be locked (NOWAIT) */ LockWaitError } LockWaitPolicy; #endif /* LOCKOPTIONS_H */