multixact_internal.h File Reference

#include "access/multixact.h"

Include dependency graph for multixact_internal.h:

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Macros
#define	MULTIXACT_OFFSETS_PER_PAGE   (BLCKSZ / sizeof(MultiXactOffset))
#define	MXACT_MEMBER_BITS_PER_XACT   8
#define	MXACT_MEMBER_FLAGS_PER_BYTE   1
#define	MXACT_MEMBER_XACT_BITMASK   ((1 << MXACT_MEMBER_BITS_PER_XACT) - 1)
#define	MULTIXACT_FLAGBYTES_PER_GROUP   4
#define	MULTIXACT_MEMBERS_PER_MEMBERGROUP    (MULTIXACT_FLAGBYTES_PER_GROUP * MXACT_MEMBER_FLAGS_PER_BYTE)
#define	MULTIXACT_MEMBERGROUP_SIZE    (sizeof(TransactionId) * MULTIXACT_MEMBERS_PER_MEMBERGROUP + MULTIXACT_FLAGBYTES_PER_GROUP)
#define	MULTIXACT_MEMBERGROUPS_PER_PAGE   (BLCKSZ / MULTIXACT_MEMBERGROUP_SIZE)
#define	MULTIXACT_MEMBERS_PER_PAGE    (MULTIXACT_MEMBERGROUPS_PER_PAGE * MULTIXACT_MEMBERS_PER_MEMBERGROUP)

Functions
static int64	MultiXactIdToOffsetPage (MultiXactId multi)
static int	MultiXactIdToOffsetEntry (MultiXactId multi)
static int64	MultiXactIdToOffsetSegment (MultiXactId multi)
static int64	MXOffsetToMemberPage (MultiXactOffset offset)
static int64	MXOffsetToMemberSegment (MultiXactOffset offset)
static int	MXOffsetToFlagsOffset (MultiXactOffset offset)
static int	MXOffsetToFlagsBitShift (MultiXactOffset offset)
static int	MXOffsetToMemberOffset (MultiXactOffset offset)
static uint64	MultiXactOffsetStorageSize (MultiXactOffset new_offset, MultiXactOffset old_offset)

Macro Definition Documentation

MULTIXACT_FLAGBYTES_PER_GROUP

#define MULTIXACT_FLAGBYTES_PER_GROUP   4

Definition at line 70 of file multixact_internal.h.

MULTIXACT_MEMBERGROUP_SIZE

#define MULTIXACT_MEMBERGROUP_SIZE    (sizeof(TransactionId) * MULTIXACT_MEMBERS_PER_MEMBERGROUP + MULTIXACT_FLAGBYTES_PER_GROUP)

Definition at line 74 of file multixact_internal.h.

{
    return offset / MULTIXACT_MEMBERS_PER_PAGE;
}
 
static inline int64
MXOffsetToMemberSegment(MultiXactOffset offset)
{
    return MXOffsetToMemberPage(offset) / SLRU_PAGES_PER_SEGMENT;
}
 
/* Location (byte offset within page) of flag word for a given member */
static inline int
MXOffsetToFlagsOffset(MultiXactOffset offset)
{
    MultiXactOffset group = offset / MULTIXACT_MEMBERS_PER_MEMBERGROUP;
    int         grouponpg = group % MULTIXACT_MEMBERGROUPS_PER_PAGE;
    int         byteoff = grouponpg * MULTIXACT_MEMBERGROUP_SIZE;
 
    return byteoff;
}
 
static inline int
MXOffsetToFlagsBitShift(MultiXactOffset offset)
{
    int         member_in_group = offset % MULTIXACT_MEMBERS_PER_MEMBERGROUP;
    int         bshift = member_in_group * MXACT_MEMBER_BITS_PER_XACT;
 
    return bshift;
}
 
/* Location (byte offset within page) of TransactionId of given member */
static inline int
MXOffsetToMemberOffset(MultiXactOffset offset)
{
    int         member_in_group = offset % MULTIXACT_MEMBERS_PER_MEMBERGROUP;
 
    return MXOffsetToFlagsOffset(offset) +
        MULTIXACT_FLAGBYTES_PER_GROUP +
        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 */

MULTIXACT_MEMBERGROUPS_PER_PAGE

#define MULTIXACT_MEMBERGROUPS_PER_PAGE   (BLCKSZ / MULTIXACT_MEMBERGROUP_SIZE)

Definition at line 76 of file multixact_internal.h.

MULTIXACT_MEMBERS_PER_MEMBERGROUP

#define MULTIXACT_MEMBERS_PER_MEMBERGROUP    (MULTIXACT_FLAGBYTES_PER_GROUP * MXACT_MEMBER_FLAGS_PER_BYTE)

Definition at line 71 of file multixact_internal.h.

MULTIXACT_MEMBERS_PER_PAGE

#define MULTIXACT_MEMBERS_PER_PAGE    (MULTIXACT_MEMBERGROUPS_PER_PAGE * MULTIXACT_MEMBERS_PER_MEMBERGROUP)

Definition at line 77 of file multixact_internal.h.

MULTIXACT_OFFSETS_PER_PAGE

#define MULTIXACT_OFFSETS_PER_PAGE   (BLCKSZ / sizeof(MultiXactOffset))

Definition at line 32 of file multixact_internal.h.

MXACT_MEMBER_BITS_PER_XACT

#define MXACT_MEMBER_BITS_PER_XACT   8

Definition at line 65 of file multixact_internal.h.

MXACT_MEMBER_FLAGS_PER_BYTE

#define MXACT_MEMBER_FLAGS_PER_BYTE   1

Definition at line 66 of file multixact_internal.h.

MXACT_MEMBER_XACT_BITMASK

#define MXACT_MEMBER_XACT_BITMASK   ((1 << MXACT_MEMBER_BITS_PER_XACT) - 1)

Definition at line 67 of file multixact_internal.h.

Function Documentation

MultiXactIdToOffsetEntry()

static int MultiXactIdToOffsetEntry ( MultiXactId  multi )

inlinestatic

Definition at line 41 of file multixact_internal.h.

{
    return multi % MULTIXACT_OFFSETS_PER_PAGE;
}

References MULTIXACT_OFFSETS_PER_PAGE.

MultiXactIdToOffsetPage()

static int64 MultiXactIdToOffsetPage ( MultiXactId  multi )

inlinestatic

Definition at line 35 of file multixact_internal.h.

{
    return multi / MULTIXACT_OFFSETS_PER_PAGE;
}

References MULTIXACT_OFFSETS_PER_PAGE.

Referenced by MultiXactIdToOffsetSegment().

MultiXactIdToOffsetSegment()

static int64 MultiXactIdToOffsetSegment ( MultiXactId  multi )

inlinestatic

Definition at line 47 of file multixact_internal.h.

{
    return MultiXactIdToOffsetPage(multi) / SLRU_PAGES_PER_SEGMENT;
}

References MultiXactIdToOffsetPage(), and SLRU_PAGES_PER_SEGMENT.

Referenced by multixact_redo(), and TruncateMultiXact().

MultiXactOffsetStorageSize()

static uint64 MultiXactOffsetStorageSize ( MultiXactOffset  new_offset, MultiXactOffset  old_offset  )

inlinestatic

Definition at line 126 of file multixact_internal.h.

{
    Assert(new_offset >= old_offset);
    return (uint64) ((new_offset - old_offset) / MULTIXACT_MEMBERS_PER_MEMBERGROUP) *
        MULTIXACT_MEMBERGROUP_SIZE;
}

References Assert, fb(), MULTIXACT_MEMBERGROUP_SIZE, and MULTIXACT_MEMBERS_PER_MEMBERGROUP.

Referenced by pg_get_multixact_stats().

MXOffsetToFlagsBitShift()

static int MXOffsetToFlagsBitShift ( MultiXactOffset  offset )

inlinestatic

Definition at line 105 of file multixact_internal.h.

{
    int         member_in_group = offset % MULTIXACT_MEMBERS_PER_MEMBERGROUP;
    int         bshift = member_in_group * MXACT_MEMBER_BITS_PER_XACT;
 
    return bshift;
}

References fb(), MULTIXACT_MEMBERS_PER_MEMBERGROUP, and MXACT_MEMBER_BITS_PER_XACT.

MXOffsetToFlagsOffset()

static int MXOffsetToFlagsOffset ( MultiXactOffset  offset )

inlinestatic

Definition at line 95 of file multixact_internal.h.

{
    MultiXactOffset group = offset / MULTIXACT_MEMBERS_PER_MEMBERGROUP;
    int         grouponpg = group % MULTIXACT_MEMBERGROUPS_PER_PAGE;
    int         byteoff = grouponpg * MULTIXACT_MEMBERGROUP_SIZE;
 
    return byteoff;
}

References fb(), MULTIXACT_MEMBERGROUP_SIZE, MULTIXACT_MEMBERGROUPS_PER_PAGE, and MULTIXACT_MEMBERS_PER_MEMBERGROUP.

Referenced by MXOffsetToMemberOffset().

MXOffsetToMemberOffset()

static int MXOffsetToMemberOffset ( MultiXactOffset  offset )

inlinestatic

Definition at line 115 of file multixact_internal.h.

{
    int         member_in_group = offset % MULTIXACT_MEMBERS_PER_MEMBERGROUP;
 
    return MXOffsetToFlagsOffset(offset) +
        MULTIXACT_FLAGBYTES_PER_GROUP +
        member_in_group * sizeof(TransactionId);
}

References fb(), MULTIXACT_FLAGBYTES_PER_GROUP, MULTIXACT_MEMBERS_PER_MEMBERGROUP, and MXOffsetToFlagsOffset().

MXOffsetToMemberPage()

static int64 MXOffsetToMemberPage ( MultiXactOffset  offset )

inlinestatic

Definition at line 82 of file multixact_internal.h.

{
    return offset / MULTIXACT_MEMBERS_PER_PAGE;
}

References MULTIXACT_MEMBERS_PER_PAGE.

Referenced by MXOffsetToMemberSegment().

MXOffsetToMemberSegment()

static int64 MXOffsetToMemberSegment ( MultiXactOffset  offset )

inlinestatic

Definition at line 88 of file multixact_internal.h.

{
    return MXOffsetToMemberPage(offset) / SLRU_PAGES_PER_SEGMENT;
}

References MXOffsetToMemberPage(), and SLRU_PAGES_PER_SEGMENT.

Referenced by multixact_redo(), and TruncateMultiXact().