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predicate_internals.h File Reference
#include "storage/lock.h"
#include "storage/lwlock.h"
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Data Structures

struct  SERIALIZABLEXACT
 
struct  PredXactListElementData
 
struct  PredXactListData
 
struct  RWConflictData
 
struct  RWConflictPoolHeaderData
 
struct  SERIALIZABLEXIDTAG
 
struct  SERIALIZABLEXID
 
struct  PREDICATELOCKTARGETTAG
 
struct  PREDICATELOCKTARGET
 
struct  PREDICATELOCKTAG
 
struct  PREDICATELOCK
 
struct  LOCALPREDICATELOCK
 
struct  PredicateLockData
 
struct  TwoPhasePredicateXactRecord
 
struct  TwoPhasePredicateLockRecord
 
struct  TwoPhasePredicateRecord
 

Macros

#define InvalidSerCommitSeqNo   ((SerCommitSeqNo) PG_UINT64_MAX)
 
#define RecoverySerCommitSeqNo   ((SerCommitSeqNo) 1)
 
#define FirstNormalSerCommitSeqNo   ((SerCommitSeqNo) 2)
 
#define SXACT_FLAG_COMMITTED   0x00000001 /* already committed */
 
#define SXACT_FLAG_PREPARED   0x00000002 /* about to commit */
 
#define SXACT_FLAG_ROLLED_BACK   0x00000004 /* already rolled back */
 
#define SXACT_FLAG_DOOMED   0x00000008 /* will roll back */
 
#define SXACT_FLAG_CONFLICT_OUT   0x00000010
 
#define SXACT_FLAG_READ_ONLY   0x00000020
 
#define SXACT_FLAG_DEFERRABLE_WAITING   0x00000040
 
#define SXACT_FLAG_RO_SAFE   0x00000080
 
#define SXACT_FLAG_RO_UNSAFE   0x00000100
 
#define SXACT_FLAG_SUMMARY_CONFLICT_IN   0x00000200
 
#define SXACT_FLAG_SUMMARY_CONFLICT_OUT   0x00000400
 
#define SXACT_FLAG_PARTIALLY_RELEASED   0x00000800
 
#define PredXactListElementDataSize    ((Size)MAXALIGN(sizeof(PredXactListElementData)))
 
#define PredXactListDataSize    ((Size)MAXALIGN(sizeof(PredXactListData)))
 
#define RWConflictDataSize    ((Size)MAXALIGN(sizeof(RWConflictData)))
 
#define RWConflictPoolHeaderDataSize    ((Size)MAXALIGN(sizeof(RWConflictPoolHeaderData)))
 
#define SET_PREDICATELOCKTARGETTAG_RELATION(locktag, dboid, reloid)
 
#define SET_PREDICATELOCKTARGETTAG_PAGE(locktag, dboid, reloid, blocknum)
 
#define SET_PREDICATELOCKTARGETTAG_TUPLE(locktag, dboid, reloid, blocknum, offnum)
 
#define GET_PREDICATELOCKTARGETTAG_DB(locktag)    ((Oid) (locktag).locktag_field1)
 
#define GET_PREDICATELOCKTARGETTAG_RELATION(locktag)    ((Oid) (locktag).locktag_field2)
 
#define GET_PREDICATELOCKTARGETTAG_PAGE(locktag)    ((BlockNumber) (locktag).locktag_field3)
 
#define GET_PREDICATELOCKTARGETTAG_OFFSET(locktag)    ((OffsetNumber) (locktag).locktag_field4)
 
#define GET_PREDICATELOCKTARGETTAG_TYPE(locktag)
 
#define InvalidSerializableXact   ((SERIALIZABLEXACT *) NULL)
 

Typedefs

typedef uint64 SerCommitSeqNo
 
typedef struct SERIALIZABLEXACT SERIALIZABLEXACT
 
typedef struct PredXactListElementData PredXactListElementData
 
typedef struct PredXactListElementDataPredXactListElement
 
typedef struct PredXactListData PredXactListData
 
typedef struct PredXactListDataPredXactList
 
typedef struct RWConflictData RWConflictData
 
typedef struct RWConflictDataRWConflict
 
typedef struct RWConflictPoolHeaderData RWConflictPoolHeaderData
 
typedef struct RWConflictPoolHeaderDataRWConflictPoolHeader
 
typedef struct SERIALIZABLEXIDTAG SERIALIZABLEXIDTAG
 
typedef struct SERIALIZABLEXID SERIALIZABLEXID
 
typedef struct PREDICATELOCKTARGETTAG PREDICATELOCKTARGETTAG
 
typedef struct PREDICATELOCKTARGET PREDICATELOCKTARGET
 
typedef struct PREDICATELOCKTAG PREDICATELOCKTAG
 
typedef struct PREDICATELOCK PREDICATELOCK
 
typedef struct LOCALPREDICATELOCK LOCALPREDICATELOCK
 
typedef enum PredicateLockTargetType PredicateLockTargetType
 
typedef struct PredicateLockData PredicateLockData
 
typedef enum TwoPhasePredicateRecordType TwoPhasePredicateRecordType
 
typedef struct TwoPhasePredicateXactRecord TwoPhasePredicateXactRecord
 
typedef struct TwoPhasePredicateLockRecord TwoPhasePredicateLockRecord
 
typedef struct TwoPhasePredicateRecord TwoPhasePredicateRecord
 

Enumerations

enum  PredicateLockTargetType { PREDLOCKTAG_RELATION , PREDLOCKTAG_PAGE , PREDLOCKTAG_TUPLE }
 
enum  TwoPhasePredicateRecordType { TWOPHASEPREDICATERECORD_XACT , TWOPHASEPREDICATERECORD_LOCK }
 

Functions

PredicateLockDataGetPredicateLockStatusData (void)
 
int GetSafeSnapshotBlockingPids (int blocked_pid, int *output, int output_size)
 

Macro Definition Documentation

◆ FirstNormalSerCommitSeqNo

#define FirstNormalSerCommitSeqNo   ((SerCommitSeqNo) 2)

Definition at line 39 of file predicate_internals.h.

◆ GET_PREDICATELOCKTARGETTAG_DB

#define GET_PREDICATELOCKTARGETTAG_DB (   locktag)     ((Oid) (locktag).locktag_field1)

Definition at line 422 of file predicate_internals.h.

◆ GET_PREDICATELOCKTARGETTAG_OFFSET

#define GET_PREDICATELOCKTARGETTAG_OFFSET (   locktag)     ((OffsetNumber) (locktag).locktag_field4)

Definition at line 428 of file predicate_internals.h.

◆ GET_PREDICATELOCKTARGETTAG_PAGE

#define GET_PREDICATELOCKTARGETTAG_PAGE (   locktag)     ((BlockNumber) (locktag).locktag_field3)

Definition at line 426 of file predicate_internals.h.

◆ GET_PREDICATELOCKTARGETTAG_RELATION

#define GET_PREDICATELOCKTARGETTAG_RELATION (   locktag)     ((Oid) (locktag).locktag_field2)

Definition at line 424 of file predicate_internals.h.

◆ GET_PREDICATELOCKTARGETTAG_TYPE

#define GET_PREDICATELOCKTARGETTAG_TYPE (   locktag)
Value:
(((locktag).locktag_field4 != InvalidOffsetNumber) ? PREDLOCKTAG_TUPLE : \
(((locktag).locktag_field3 != InvalidBlockNumber) ? PREDLOCKTAG_PAGE : \
PREDLOCKTAG_RELATION))
#define InvalidBlockNumber
Definition: block.h:33
#define InvalidOffsetNumber
Definition: off.h:26
@ PREDLOCKTAG_PAGE
@ PREDLOCKTAG_TUPLE

Definition at line 430 of file predicate_internals.h.

◆ InvalidSerCommitSeqNo

#define InvalidSerCommitSeqNo   ((SerCommitSeqNo) PG_UINT64_MAX)

Definition at line 37 of file predicate_internals.h.

◆ InvalidSerializableXact

#define InvalidSerializableXact   ((SERIALIZABLEXACT *) NULL)

Definition at line 483 of file predicate_internals.h.

◆ PredXactListDataSize

#define PredXactListDataSize    ((Size)MAXALIGN(sizeof(PredXactListData)))

Definition at line 195 of file predicate_internals.h.

◆ PredXactListElementDataSize

#define PredXactListElementDataSize    ((Size)MAXALIGN(sizeof(PredXactListElementData)))

Definition at line 157 of file predicate_internals.h.

◆ RecoverySerCommitSeqNo

#define RecoverySerCommitSeqNo   ((SerCommitSeqNo) 1)

Definition at line 38 of file predicate_internals.h.

◆ RWConflictDataSize

#define RWConflictDataSize    ((Size)MAXALIGN(sizeof(RWConflictData)))

Definition at line 219 of file predicate_internals.h.

◆ RWConflictPoolHeaderDataSize

#define RWConflictPoolHeaderDataSize    ((Size)MAXALIGN(sizeof(RWConflictPoolHeaderData)))

Definition at line 230 of file predicate_internals.h.

◆ SET_PREDICATELOCKTARGETTAG_PAGE

#define SET_PREDICATELOCKTARGETTAG_PAGE (   locktag,
  dboid,
  reloid,
  blocknum 
)
Value:
((locktag).locktag_field1 = (dboid), \
(locktag).locktag_field2 = (reloid), \
(locktag).locktag_field3 = (blocknum), \
(locktag).locktag_field4 = InvalidOffsetNumber)

Definition at line 410 of file predicate_internals.h.

◆ SET_PREDICATELOCKTARGETTAG_RELATION

#define SET_PREDICATELOCKTARGETTAG_RELATION (   locktag,
  dboid,
  reloid 
)
Value:
((locktag).locktag_field1 = (dboid), \
(locktag).locktag_field2 = (reloid), \
(locktag).locktag_field3 = InvalidBlockNumber, \
(locktag).locktag_field4 = InvalidOffsetNumber)

Definition at line 404 of file predicate_internals.h.

◆ SET_PREDICATELOCKTARGETTAG_TUPLE

#define SET_PREDICATELOCKTARGETTAG_TUPLE (   locktag,
  dboid,
  reloid,
  blocknum,
  offnum 
)
Value:
((locktag).locktag_field1 = (dboid), \
(locktag).locktag_field2 = (reloid), \
(locktag).locktag_field3 = (blocknum), \
(locktag).locktag_field4 = (offnum))

Definition at line 416 of file predicate_internals.h.

◆ SXACT_FLAG_COMMITTED

#define SXACT_FLAG_COMMITTED   0x00000001 /* already committed */

Definition at line 119 of file predicate_internals.h.

◆ SXACT_FLAG_CONFLICT_OUT

#define SXACT_FLAG_CONFLICT_OUT   0x00000010

Definition at line 128 of file predicate_internals.h.

◆ SXACT_FLAG_DEFERRABLE_WAITING

#define SXACT_FLAG_DEFERRABLE_WAITING   0x00000040

Definition at line 130 of file predicate_internals.h.

◆ SXACT_FLAG_DOOMED

#define SXACT_FLAG_DOOMED   0x00000008 /* will roll back */

Definition at line 122 of file predicate_internals.h.

◆ SXACT_FLAG_PARTIALLY_RELEASED

#define SXACT_FLAG_PARTIALLY_RELEASED   0x00000800

Definition at line 140 of file predicate_internals.h.

◆ SXACT_FLAG_PREPARED

#define SXACT_FLAG_PREPARED   0x00000002 /* about to commit */

Definition at line 120 of file predicate_internals.h.

◆ SXACT_FLAG_READ_ONLY

#define SXACT_FLAG_READ_ONLY   0x00000020

Definition at line 129 of file predicate_internals.h.

◆ SXACT_FLAG_RO_SAFE

#define SXACT_FLAG_RO_SAFE   0x00000080

Definition at line 131 of file predicate_internals.h.

◆ SXACT_FLAG_RO_UNSAFE

#define SXACT_FLAG_RO_UNSAFE   0x00000100

Definition at line 132 of file predicate_internals.h.

◆ SXACT_FLAG_ROLLED_BACK

#define SXACT_FLAG_ROLLED_BACK   0x00000004 /* already rolled back */

Definition at line 121 of file predicate_internals.h.

◆ SXACT_FLAG_SUMMARY_CONFLICT_IN

#define SXACT_FLAG_SUMMARY_CONFLICT_IN   0x00000200

Definition at line 133 of file predicate_internals.h.

◆ SXACT_FLAG_SUMMARY_CONFLICT_OUT

#define SXACT_FLAG_SUMMARY_CONFLICT_OUT   0x00000400

Definition at line 134 of file predicate_internals.h.

Typedef Documentation

◆ LOCALPREDICATELOCK

◆ PREDICATELOCK

typedef struct PREDICATELOCK PREDICATELOCK

◆ PredicateLockData

◆ PREDICATELOCKTAG

◆ PREDICATELOCKTARGET

◆ PREDICATELOCKTARGETTAG

◆ PredicateLockTargetType

◆ PredXactList

typedef struct PredXactListData* PredXactList

Definition at line 193 of file predicate_internals.h.

◆ PredXactListData

◆ PredXactListElement

Definition at line 155 of file predicate_internals.h.

◆ PredXactListElementData

◆ RWConflict

typedef struct RWConflictData* RWConflict

Definition at line 217 of file predicate_internals.h.

◆ RWConflictData

◆ RWConflictPoolHeader

Definition at line 228 of file predicate_internals.h.

◆ RWConflictPoolHeaderData

◆ SerCommitSeqNo

typedef uint64 SerCommitSeqNo

Definition at line 23 of file predicate_internals.h.

◆ SERIALIZABLEXACT

◆ SERIALIZABLEXID

◆ SERIALIZABLEXIDTAG

◆ TwoPhasePredicateLockRecord

◆ TwoPhasePredicateRecord

◆ TwoPhasePredicateRecordType

◆ TwoPhasePredicateXactRecord

Enumeration Type Documentation

◆ PredicateLockTargetType

Enumerator
PREDLOCKTAG_RELATION 
PREDLOCKTAG_PAGE 
PREDLOCKTAG_TUPLE 

Definition at line 377 of file predicate_internals.h.

378 {
382  /* TODO SSI: Other types may be needed for index locking */
PredicateLockTargetType
@ PREDLOCKTAG_RELATION

◆ TwoPhasePredicateRecordType

Enumerator
TWOPHASEPREDICATERECORD_XACT 
TWOPHASEPREDICATERECORD_LOCK 

Definition at line 440 of file predicate_internals.h.

Function Documentation

◆ GetPredicateLockStatusData()

PredicateLockData* GetPredicateLockStatusData ( void  )

Definition at line 1444 of file predicate.c.

1445 {
1447  int i;
1448  int els,
1449  el;
1450  HASH_SEQ_STATUS seqstat;
1451  PREDICATELOCK *predlock;
1452 
1454 
1455  /*
1456  * To ensure consistency, take simultaneous locks on all partition locks
1457  * in ascending order, then SerializableXactHashLock.
1458  */
1459  for (i = 0; i < NUM_PREDICATELOCK_PARTITIONS; i++)
1461  LWLockAcquire(SerializableXactHashLock, LW_SHARED);
1462 
1463  /* Get number of locks and allocate appropriately-sized arrays. */
1465  data->nelements = els;
1466  data->locktags = (PREDICATELOCKTARGETTAG *)
1467  palloc(sizeof(PREDICATELOCKTARGETTAG) * els);
1468  data->xacts = (SERIALIZABLEXACT *)
1469  palloc(sizeof(SERIALIZABLEXACT) * els);
1470 
1471 
1472  /* Scan through PredicateLockHash and copy contents */
1473  hash_seq_init(&seqstat, PredicateLockHash);
1474 
1475  el = 0;
1476 
1477  while ((predlock = (PREDICATELOCK *) hash_seq_search(&seqstat)))
1478  {
1479  data->locktags[el] = predlock->tag.myTarget->tag;
1480  data->xacts[el] = *predlock->tag.myXact;
1481  el++;
1482  }
1483 
1484  Assert(el == els);
1485 
1486  /* Release locks in reverse order */
1487  LWLockRelease(SerializableXactHashLock);
1488  for (i = NUM_PREDICATELOCK_PARTITIONS - 1; i >= 0; i--)
1490 
1491  return data;
1492 }
long hash_get_num_entries(HTAB *hashp)
Definition: dynahash.c:1382
void * hash_seq_search(HASH_SEQ_STATUS *status)
Definition: dynahash.c:1436
void hash_seq_init(HASH_SEQ_STATUS *status, HTAB *hashp)
Definition: dynahash.c:1426
int i
Definition: isn.c:73
Assert(fmt[strlen(fmt) - 1] !='\n')
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1196
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1800
@ LW_SHARED
Definition: lwlock.h:105
#define NUM_PREDICATELOCK_PARTITIONS
Definition: lwlock.h:91
void * palloc(Size size)
Definition: mcxt.c:1068
const void * data
static HTAB * PredicateLockHash
Definition: predicate.c:393
#define PredicateLockHashPartitionLockByIndex(i)
Definition: predicate.c:256
SERIALIZABLEXACT * myXact
PREDICATELOCKTARGET * myTarget
PREDICATELOCKTARGETTAG tag
PREDICATELOCKTAG tag

References Assert(), data, hash_get_num_entries(), hash_seq_init(), hash_seq_search(), i, LW_SHARED, LWLockAcquire(), LWLockRelease(), PREDICATELOCKTAG::myTarget, PREDICATELOCKTAG::myXact, NUM_PREDICATELOCK_PARTITIONS, palloc(), PredicateLockHash, PredicateLockHashPartitionLockByIndex, PREDICATELOCKTARGET::tag, and PREDICATELOCK::tag.

Referenced by pg_lock_status().

◆ GetSafeSnapshotBlockingPids()

int GetSafeSnapshotBlockingPids ( int  blocked_pid,
int *  output,
int  output_size 
)

Definition at line 1629 of file predicate.c.

1630 {
1631  int num_written = 0;
1632  SERIALIZABLEXACT *sxact;
1633 
1634  LWLockAcquire(SerializableXactHashLock, LW_SHARED);
1635 
1636  /* Find blocked_pid's SERIALIZABLEXACT by linear search. */
1637  for (sxact = FirstPredXact(); sxact != NULL; sxact = NextPredXact(sxact))
1638  {
1639  if (sxact->pid == blocked_pid)
1640  break;
1641  }
1642 
1643  /* Did we find it, and is it currently waiting in GetSafeSnapshot? */
1644  if (sxact != NULL && SxactIsDeferrableWaiting(sxact))
1645  {
1646  RWConflict possibleUnsafeConflict;
1647 
1648  /* Traverse the list of possible unsafe conflicts collecting PIDs. */
1649  possibleUnsafeConflict = (RWConflict)
1651  &sxact->possibleUnsafeConflicts,
1652  offsetof(RWConflictData, inLink));
1653 
1654  while (possibleUnsafeConflict != NULL && num_written < output_size)
1655  {
1656  output[num_written++] = possibleUnsafeConflict->sxactOut->pid;
1657  possibleUnsafeConflict = (RWConflict)
1659  &possibleUnsafeConflict->inLink,
1660  offsetof(RWConflictData, inLink));
1661  }
1662  }
1663 
1664  LWLockRelease(SerializableXactHashLock);
1665 
1666  return num_written;
1667 }
#define offsetof(type, field)
Definition: c.h:727
static void output(uint64 loop_count)
static SERIALIZABLEXACT * FirstPredXact(void)
Definition: predicate.c:612
#define SxactIsDeferrableWaiting(sxact)
Definition: predicate.c:285
static SERIALIZABLEXACT * NextPredXact(SERIALIZABLEXACT *sxact)
Definition: predicate.c:627
struct RWConflictData * RWConflict
Pointer SHMQueueNext(const SHM_QUEUE *queue, const SHM_QUEUE *curElem, Size linkOffset)
Definition: shmqueue.c:145
SERIALIZABLEXACT * sxactOut
SHM_QUEUE possibleUnsafeConflicts

References FirstPredXact(), RWConflictData::inLink, LW_SHARED, LWLockAcquire(), LWLockRelease(), NextPredXact(), offsetof, output(), SERIALIZABLEXACT::pid, SERIALIZABLEXACT::possibleUnsafeConflicts, SHMQueueNext(), SxactIsDeferrableWaiting, and RWConflictData::sxactOut.

Referenced by pg_isolation_test_session_is_blocked(), and pg_safe_snapshot_blocking_pids().