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Add MultiXactOffsetStorageSize() to multixact_internal.h

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This function calculates in bytes the storage taken between two
multixact offsets.  This will be used in an upcoming patch, introduced
separately here as this piece can be useful on its own.

Author: Naga Appani <nagnrik@gmail.com>
Co-authored-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/aUyTvZMq2CLgNEB4@paquier.xyz
This commit is contained in:
Michael Paquier
2025-12-30 14:13:40 +09:00
parent 9cf746a453
commit 0e3ad4b96a
1 changed files with 10 additions and 0 deletions
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10
src/include/access/multixact_internal.h
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@@ -121,4 +121,14 @@ MXOffsetToMemberOffset(MultiXactOffset offset)
member_in_group * sizeof(TransactionId); member_in_group * sizeof(TransactionId);
} }
/* Storage space consumed by a range of offsets, in bytes */
static inline uint64
MultiXactOffsetStorageSize(MultiXactOffset new_offset,
MultiXactOffset old_offset)
{
Assert(new_offset >= old_offset);
return (uint64) ((new_offset - old_offset) / MULTIXACT_MEMBERS_PER_MEMBERGROUP) *
MULTIXACT_MEMBERGROUP_SIZE;
}
#endif /* MULTIXACT_INTERNAL_H */ #endif /* MULTIXACT_INTERNAL_H */