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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.

Referenced by InitPredicateLocks(), and ReleasePredicateLocks().

◆ GET_PREDICATELOCKTARGETTAG_DB

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

◆ GET_PREDICATELOCKTARGETTAG_OFFSET

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

Definition at line 423 of file predicate_internals.h.

Referenced by CheckTargetForConflictsIn(), and pg_lock_status().

◆ GET_PREDICATELOCKTARGETTAG_PAGE

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

Definition at line 421 of file predicate_internals.h.

Referenced by GetParentPredicateLockTag(), and pg_lock_status().

◆ GET_PREDICATELOCKTARGETTAG_RELATION

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

◆ GET_PREDICATELOCKTARGETTAG_TYPE

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

Definition at line 425 of file predicate_internals.h.

Referenced by DropAllPredicateLocksFromTable(), GetParentPredicateLockTag(), MaxPredicateChildLocks(), pg_lock_status(), and PredicateLockAcquire().

◆ InvalidSerCommitSeqNo

◆ InvalidSerializableXact

◆ PredXactListDataSize

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

Definition at line 190 of file predicate_internals.h.

Referenced by InitPredicateLocks(), and PredicateLockShmemSize().

◆ PredXactListElementDataSize

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

Definition at line 152 of file predicate_internals.h.

Referenced by InitPredicateLocks(), and PredicateLockShmemSize().

◆ RecoverySerCommitSeqNo

#define RecoverySerCommitSeqNo   ((SerCommitSeqNo) 1)

Definition at line 38 of file predicate_internals.h.

Referenced by predicatelock_twophase_recover().

◆ RWConflictDataSize

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

Definition at line 214 of file predicate_internals.h.

Referenced by InitPredicateLocks(), and PredicateLockShmemSize().

◆ RWConflictPoolHeaderDataSize

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

Definition at line 225 of file predicate_internals.h.

Referenced by InitPredicateLocks(), and PredicateLockShmemSize().

◆ 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)
#define InvalidOffsetNumber
Definition: off.h:26

Definition at line 405 of file predicate_internals.h.

Referenced by CheckForSerializableConflictIn(), GetParentPredicateLockTag(), PageIsPredicateLocked(), PredicateLockPage(), and PredicateLockPageSplit().

◆ 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)
#define InvalidOffsetNumber
Definition: off.h:26
#define InvalidBlockNumber
Definition: block.h:33

Definition at line 399 of file predicate_internals.h.

Referenced by CheckForSerializableConflictIn(), DropAllPredicateLocksFromTable(), GetParentPredicateLockTag(), PredicateLockRelation(), and PredicateLockTuple().

◆ 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 411 of file predicate_internals.h.

Referenced by CheckForSerializableConflictIn(), and PredicateLockTuple().

◆ SXACT_FLAG_COMMITTED

#define SXACT_FLAG_COMMITTED   0x00000001 /* already committed */

Definition at line 114 of file predicate_internals.h.

Referenced by InitPredicateLocks(), and ReleasePredicateLocks().

◆ SXACT_FLAG_CONFLICT_OUT

#define SXACT_FLAG_CONFLICT_OUT   0x00000010

Definition at line 123 of file predicate_internals.h.

Referenced by ReleasePredicateLocks().

◆ SXACT_FLAG_DEFERRABLE_WAITING

#define SXACT_FLAG_DEFERRABLE_WAITING   0x00000040

Definition at line 125 of file predicate_internals.h.

Referenced by GetSafeSnapshot().

◆ SXACT_FLAG_DOOMED

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

◆ SXACT_FLAG_PARTIALLY_RELEASED

#define SXACT_FLAG_PARTIALLY_RELEASED   0x00000800

Definition at line 135 of file predicate_internals.h.

Referenced by ReleasePredicateLocks().

◆ SXACT_FLAG_PREPARED

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

◆ SXACT_FLAG_READ_ONLY

#define SXACT_FLAG_READ_ONLY   0x00000020

◆ SXACT_FLAG_RO_SAFE

#define SXACT_FLAG_RO_SAFE   0x00000080

Definition at line 126 of file predicate_internals.h.

Referenced by ReleasePredicateLocks().

◆ SXACT_FLAG_RO_UNSAFE

#define SXACT_FLAG_RO_UNSAFE   0x00000100

Definition at line 127 of file predicate_internals.h.

Referenced by FlagSxactUnsafe().

◆ SXACT_FLAG_ROLLED_BACK

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

Definition at line 116 of file predicate_internals.h.

Referenced by ReleasePredicateLocks().

◆ SXACT_FLAG_SUMMARY_CONFLICT_IN

#define SXACT_FLAG_SUMMARY_CONFLICT_IN   0x00000200

◆ SXACT_FLAG_SUMMARY_CONFLICT_OUT

#define SXACT_FLAG_SUMMARY_CONFLICT_OUT   0x00000400

Typedef Documentation

◆ LOCALPREDICATELOCK

◆ PREDICATELOCK

typedef struct PREDICATELOCK PREDICATELOCK

◆ PredicateLockData

◆ PREDICATELOCKTAG

◆ PREDICATELOCKTARGET

◆ PREDICATELOCKTARGETTAG

◆ PredicateLockTargetType

◆ PredXactList

typedef struct PredXactListData* PredXactList

Definition at line 188 of file predicate_internals.h.

◆ PredXactListData

◆ PredXactListElement

Definition at line 150 of file predicate_internals.h.

◆ PredXactListElementData

◆ RWConflict

typedef struct RWConflictData* RWConflict

Definition at line 212 of file predicate_internals.h.

◆ RWConflictData

◆ RWConflictPoolHeader

Definition at line 223 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 372 of file predicate_internals.h.

373 {
377  /* TODO SSI: Other types may be needed for index locking */
PredicateLockTargetType

◆ TwoPhasePredicateRecordType

Enumerator
TWOPHASEPREDICATERECORD_XACT 
TWOPHASEPREDICATERECORD_LOCK 

Definition at line 435 of file predicate_internals.h.

Function Documentation

◆ GetPredicateLockStatusData()

PredicateLockData* GetPredicateLockStatusData ( void  )

Definition at line 1376 of file predicate.c.

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

Referenced by pg_lock_status().

1377 {
1378  PredicateLockData *data;
1379  int i;
1380  int els,
1381  el;
1382  HASH_SEQ_STATUS seqstat;
1383  PREDICATELOCK *predlock;
1384 
1385  data = (PredicateLockData *) palloc(sizeof(PredicateLockData));
1386 
1387  /*
1388  * To ensure consistency, take simultaneous locks on all partition locks
1389  * in ascending order, then SerializableXactHashLock.
1390  */
1391  for (i = 0; i < NUM_PREDICATELOCK_PARTITIONS; i++)
1393  LWLockAcquire(SerializableXactHashLock, LW_SHARED);
1394 
1395  /* Get number of locks and allocate appropriately-sized arrays. */
1397  data->nelements = els;
1398  data->locktags = (PREDICATELOCKTARGETTAG *)
1399  palloc(sizeof(PREDICATELOCKTARGETTAG) * els);
1400  data->xacts = (SERIALIZABLEXACT *)
1401  palloc(sizeof(SERIALIZABLEXACT) * els);
1402 
1403 
1404  /* Scan through PredicateLockHash and copy contents */
1405  hash_seq_init(&seqstat, PredicateLockHash);
1406 
1407  el = 0;
1408 
1409  while ((predlock = (PREDICATELOCK *) hash_seq_search(&seqstat)))
1410  {
1411  data->locktags[el] = predlock->tag.myTarget->tag;
1412  data->xacts[el] = *predlock->tag.myXact;
1413  el++;
1414  }
1415 
1416  Assert(el == els);
1417 
1418  /* Release locks in reverse order */
1419  LWLockRelease(SerializableXactHashLock);
1420  for (i = NUM_PREDICATELOCK_PARTITIONS - 1; i >= 0; i--)
1422 
1423  return data;
1424 }
long hash_get_num_entries(HTAB *hashp)
Definition: dynahash.c:1335
SERIALIZABLEXACT * xacts
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1726
static HTAB * PredicateLockHash
Definition: predicate.c:396
PREDICATELOCKTARGETTAG * locktags
PREDICATELOCKTAG tag
PREDICATELOCKTARGETTAG tag
#define Assert(condition)
Definition: c.h:739
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1122
void * hash_seq_search(HASH_SEQ_STATUS *status)
Definition: dynahash.c:1389
void hash_seq_init(HASH_SEQ_STATUS *status, HTAB *hashp)
Definition: dynahash.c:1379
#define PredicateLockHashPartitionLockByIndex(i)
Definition: predicate.c:259
void * palloc(Size size)
Definition: mcxt.c:949
int i
SERIALIZABLEXACT * myXact
PREDICATELOCKTARGET * myTarget
#define NUM_PREDICATELOCK_PARTITIONS
Definition: lwlock.h:121

◆ GetSafeSnapshotBlockingPids()

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

Definition at line 1561 of file predicate.c.

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

Referenced by pg_isolation_test_session_is_blocked(), and pg_safe_snapshot_blocking_pids().

1562 {
1563  int num_written = 0;
1564  SERIALIZABLEXACT *sxact;
1565 
1566  LWLockAcquire(SerializableXactHashLock, LW_SHARED);
1567 
1568  /* Find blocked_pid's SERIALIZABLEXACT by linear search. */
1569  for (sxact = FirstPredXact(); sxact != NULL; sxact = NextPredXact(sxact))
1570  {
1571  if (sxact->pid == blocked_pid)
1572  break;
1573  }
1574 
1575  /* Did we find it, and is it currently waiting in GetSafeSnapshot? */
1576  if (sxact != NULL && SxactIsDeferrableWaiting(sxact))
1577  {
1578  RWConflict possibleUnsafeConflict;
1579 
1580  /* Traverse the list of possible unsafe conflicts collecting PIDs. */
1581  possibleUnsafeConflict = (RWConflict)
1583  &sxact->possibleUnsafeConflicts,
1584  offsetof(RWConflictData, inLink));
1585 
1586  while (possibleUnsafeConflict != NULL && num_written < output_size)
1587  {
1588  output[num_written++] = possibleUnsafeConflict->sxactOut->pid;
1589  possibleUnsafeConflict = (RWConflict)
1591  &possibleUnsafeConflict->inLink,
1592  offsetof(RWConflictData, inLink));
1593  }
1594  }
1595 
1596  LWLockRelease(SerializableXactHashLock);
1597 
1598  return num_written;
1599 }
static void output(uint64 loop_count)
struct RWConflictData * RWConflict
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1726
SHM_QUEUE possibleUnsafeConflicts
static SERIALIZABLEXACT * NextPredXact(SERIALIZABLEXACT *sxact)
Definition: predicate.c:630
static SERIALIZABLEXACT * FirstPredXact(void)
Definition: predicate.c:615
Pointer SHMQueueNext(const SHM_QUEUE *queue, const SHM_QUEUE *curElem, Size linkOffset)
Definition: shmqueue.c:145
#define SxactIsDeferrableWaiting(sxact)
Definition: predicate.c:288
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1122
#define offsetof(type, field)
Definition: c.h:662
SERIALIZABLEXACT * sxactOut