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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:15:05 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:15:05 +0000 |
commit | 46651ce6fe013220ed397add242004d764fc0153 (patch) | |
tree | 6e5299f990f88e60174a1d3ae6e48eedd2688b2b /src/include/nodes/lockoptions.h | |
parent | Initial commit. (diff) | |
download | postgresql-14-upstream.tar.xz postgresql-14-upstream.zip |
Adding upstream version 14.5.upstream/14.5upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/include/nodes/lockoptions.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/include/nodes/lockoptions.h b/src/include/nodes/lockoptions.h new file mode 100644 index 0000000..b152435 --- /dev/null +++ b/src/include/nodes/lockoptions.h @@ -0,0 +1,61 @@ +/*------------------------------------------------------------------------- + * + * lockoptions.h + * Common header for some locking-related declarations. + * + * + * Copyright (c) 2014-2021, 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; + +/* + * Possible lock modes for a tuple. + */ +typedef enum LockTupleMode +{ + /* SELECT FOR KEY SHARE */ + LockTupleKeyShare, + /* SELECT FOR SHARE */ + LockTupleShare, + /* SELECT FOR NO KEY UPDATE, and UPDATEs that don't modify key columns */ + LockTupleNoKeyExclusive, + /* SELECT FOR UPDATE, UPDATEs that modify key columns, and DELETE */ + LockTupleExclusive +} LockTupleMode; + +#endif /* LOCKOPTIONS_H */ |