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Diffstat (limited to 'src/include/nodes/lockoptions.h')
| -rw-r--r-- | src/include/nodes/lockoptions.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/include/nodes/lockoptions.h b/src/include/nodes/lockoptions.h new file mode 100644 index 0000000000..55324baf40 --- /dev/null +++ b/src/include/nodes/lockoptions.h @@ -0,0 +1,45 @@ +/*------------------------------------------------------------------------- + * + * lockoptions.h + * Common header for some locking-related declarations. + * + * + * Copyright (c) 2014-2015, 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_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 */ |