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| author | Bruce Momjian <bruce@momjian.us> | 2014-09-10 17:13:04 -0400 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2014-09-10 17:13:04 -0400 |
| commit | 36ad1a87a368d837d5c2260b2fd2ff83e976425a (patch) | |
| tree | b951f5f04b2f8f46f3d5947e092590b7f248d07d /src/backend/utils/adt/xid.c | |
| parent | 84aa8ba128a08e6fdebb2497c7a79ebf18093e12 (diff) | |
| download | postgresql-36ad1a87a368d837d5c2260b2fd2ff83e976425a.tar.gz postgresql-36ad1a87a368d837d5c2260b2fd2ff83e976425a.zip | |
Implement mxid_age() to compute multi-xid age
Report by Josh Berkus
Diffstat (limited to 'src/backend/utils/adt/xid.c')
| -rw-r--r-- | src/backend/utils/adt/xid.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/backend/utils/adt/xid.c b/src/backend/utils/adt/xid.c index 602a9e5d6f4..ecb3cf55dd1 100644 --- a/src/backend/utils/adt/xid.c +++ b/src/backend/utils/adt/xid.c @@ -16,6 +16,7 @@ #include <limits.h> +#include "access/multixact.h" #include "access/transam.h" #include "access/xact.h" #include "libpq/pqformat.h" @@ -103,6 +104,21 @@ xid_age(PG_FUNCTION_ARGS) } /* + * mxid_age - compute age of a multi XID (relative to latest stable mxid) + */ +Datum +mxid_age(PG_FUNCTION_ARGS) +{ + TransactionId xid = PG_GETARG_TRANSACTIONID(0); + MultiXactId now = ReadNextMultiXactId(); + + if (!MultiXactIdIsValid(xid)) + PG_RETURN_INT32(INT_MAX); + + PG_RETURN_INT32((int32) (now - xid)); +} + +/* * xidComparator * qsort comparison function for XIDs * |