diff options
Diffstat (limited to 'src/include/access/xact.h')
| -rw-r--r-- | src/include/access/xact.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/src/include/access/xact.h b/src/include/access/xact.h index 902e99e815c..1685a0167f5 100644 --- a/src/include/access/xact.h +++ b/src/include/access/xact.h @@ -32,15 +32,26 @@ extern int DefaultXactIsoLevel; extern int XactIsoLevel; /* - * We only implement two isolation levels internally. This macro should - * be used to check which one is selected. + * We implement three isolation levels internally. + * The two stronger ones use one snapshot per database transaction; + * the others use one snapshot per statement. + * Serializable uses predicate locks in addition to snapshots. + * These macros should be used to check which isolation level is selected. */ #define IsolationUsesXactSnapshot() (XactIsoLevel >= XACT_REPEATABLE_READ) +#define IsolationIsSerializable() (XactIsoLevel == XACT_SERIALIZABLE) /* Xact read-only state */ extern bool DefaultXactReadOnly; extern bool XactReadOnly; +/* + * Xact is deferrable -- only meaningful (currently) for read only + * SERIALIZABLE transactions + */ +extern bool DefaultXactDeferrable; +extern bool XactDeferrable; + /* Asynchronous commits */ extern bool XactSyncCommit; |