PostgreSQL Source Code  git master
proc.h
Go to the documentation of this file.
1 /*-------------------------------------------------------------------------
2  *
3  * proc.h
4  * per-process shared memory data structures
5  *
6  *
7  * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
8  * Portions Copyright (c) 1994, Regents of the University of California
9  *
10  * src/include/storage/proc.h
11  *
12  *-------------------------------------------------------------------------
13  */
14 #ifndef _PROC_H_
15 #define _PROC_H_
16 
17 #include "access/clog.h"
18 #include "access/xlogdefs.h"
19 #include "lib/ilist.h"
20 #include "storage/latch.h"
21 #include "storage/lock.h"
22 #include "storage/pg_sema.h"
23 #include "storage/proclist_types.h"
24 
25 /*
26  * Each backend advertises up to PGPROC_MAX_CACHED_SUBXIDS TransactionIds
27  * for non-aborted subtransactions of its current top transaction. These
28  * have to be treated as running XIDs by other backends.
29  *
30  * We also keep track of whether the cache overflowed (ie, the transaction has
31  * generated at least one subtransaction that didn't fit in the cache).
32  * If none of the caches have overflowed, we can assume that an XID that's not
33  * listed anywhere in the PGPROC array is not a running transaction. Else we
34  * have to look at pg_subtrans.
35  *
36  * See src/test/isolation/specs/subxid-overflow.spec if you change this.
37  */
38 #define PGPROC_MAX_CACHED_SUBXIDS 64 /* XXX guessed-at value */
39 
40 typedef struct XidCacheStatus
41 {
42  /* number of cached subxids, never more than PGPROC_MAX_CACHED_SUBXIDS */
44  /* has PGPROC->subxids overflowed */
45  bool overflowed;
47 
48 struct XidCache
49 {
51 };
52 
53 /*
54  * Flags for PGPROC->statusFlags and PROC_HDR->statusFlags[]
55  */
56 #define PROC_IS_AUTOVACUUM 0x01 /* is it an autovac worker? */
57 #define PROC_IN_VACUUM 0x02 /* currently running lazy vacuum */
58 #define PROC_IN_SAFE_IC 0x04 /* currently running CREATE INDEX
59  * CONCURRENTLY or REINDEX
60  * CONCURRENTLY on non-expressional,
61  * non-partial index */
62 #define PROC_VACUUM_FOR_WRAPAROUND 0x08 /* set by autovac only */
63 #define PROC_IN_LOGICAL_DECODING 0x10 /* currently doing logical
64  * decoding outside xact */
65 #define PROC_AFFECTS_ALL_HORIZONS 0x20 /* this proc's xmin must be
66  * included in vacuum horizons
67  * in all databases */
68 
69 /* flags reset at EOXact */
70 #define PROC_VACUUM_STATE_MASK \
71  (PROC_IN_VACUUM | PROC_IN_SAFE_IC | PROC_VACUUM_FOR_WRAPAROUND)
72 
73 /*
74  * Xmin-related flags. Make sure any flags that affect how the process' Xmin
75  * value is interpreted by VACUUM are included here.
76  */
77 #define PROC_XMIN_FLAGS (PROC_IN_VACUUM | PROC_IN_SAFE_IC)
78 
79 /*
80  * We allow a small number of "weak" relation locks (AccessShareLock,
81  * RowShareLock, RowExclusiveLock) to be recorded in the PGPROC structure
82  * rather than the main lock table. This eases contention on the lock
83  * manager LWLocks. See storage/lmgr/README for additional details.
84  */
85 #define FP_LOCK_SLOTS_PER_BACKEND 16
86 
87 /*
88  * An invalid pgprocno. Must be larger than the maximum number of PGPROC
89  * structures we could possibly have. See comments for MAX_BACKENDS.
90  */
91 #define INVALID_PGPROCNO PG_INT32_MAX
92 
93 /*
94  * Flags for PGPROC.delayChkptFlags
95  *
96  * These flags can be used to delay the start or completion of a checkpoint
97  * for short periods. A flag is in effect if the corresponding bit is set in
98  * the PGPROC of any backend.
99  *
100  * For our purposes here, a checkpoint has three phases: (1) determine the
101  * location to which the redo pointer will be moved, (2) write all the
102  * data durably to disk, and (3) WAL-log the checkpoint.
103  *
104  * Setting DELAY_CHKPT_START prevents the system from moving from phase 1
105  * to phase 2. This is useful when we are performing a WAL-logged modification
106  * of data that will be flushed to disk in phase 2. By setting this flag
107  * before writing WAL and clearing it after we've both written WAL and
108  * performed the corresponding modification, we ensure that if the WAL record
109  * is inserted prior to the new redo point, the corresponding data changes will
110  * also be flushed to disk before the checkpoint can complete. (In the
111  * extremely common case where the data being modified is in shared buffers
112  * and we acquire an exclusive content lock on the relevant buffers before
113  * writing WAL, this mechanism is not needed, because phase 2 will block
114  * until we release the content lock and then flush the modified data to
115  * disk.)
116  *
117  * Setting DELAY_CHKPT_COMPLETE prevents the system from moving from phase 2
118  * to phase 3. This is useful if we are performing a WAL-logged operation that
119  * might invalidate buffers, such as relation truncation. In this case, we need
120  * to ensure that any buffers which were invalidated and thus not flushed by
121  * the checkpoint are actually destroyed on disk. Replay can cope with a file
122  * or block that doesn't exist, but not with a block that has the wrong
123  * contents.
124  */
125 #define DELAY_CHKPT_START (1<<0)
126 #define DELAY_CHKPT_COMPLETE (1<<1)
127 
128 typedef enum
129 {
134 
135 /*
136  * Each backend has a PGPROC struct in shared memory. There is also a list of
137  * currently-unused PGPROC structs that will be reallocated to new backends.
138  *
139  * links: list link for any list the PGPROC is in. When waiting for a lock,
140  * the PGPROC is linked into that lock's waitProcs queue. A recycled PGPROC
141  * is linked into ProcGlobal's freeProcs list.
142  *
143  * Note: twophase.c also sets up a dummy PGPROC struct for each currently
144  * prepared transaction. These PGPROCs appear in the ProcArray data structure
145  * so that the prepared transactions appear to be still running and are
146  * correctly shown as holding locks. A prepared transaction PGPROC can be
147  * distinguished from a real one at need by the fact that it has pid == 0.
148  * The semaphore and lock-activity fields in a prepared-xact PGPROC are unused,
149  * but its myProcLocks[] lists are valid.
150  *
151  * We allow many fields of this struct to be accessed without locks, such as
152  * delayChkptFlags and isBackgroundWorker. However, keep in mind that writing
153  * mirrored ones (see below) requires holding ProcArrayLock or XidGenLock in
154  * at least shared mode, so that pgxactoff does not change concurrently.
155  *
156  * Mirrored fields:
157  *
158  * Some fields in PGPROC (see "mirrored in ..." comment) are mirrored into an
159  * element of more densely packed ProcGlobal arrays. These arrays are indexed
160  * by PGPROC->pgxactoff. Both copies need to be maintained coherently.
161  *
162  * NB: The pgxactoff indexed value can *never* be accessed without holding
163  * locks.
164  *
165  * See PROC_HDR for details.
166  */
167 struct PGPROC
168 {
169  /* proc->links MUST BE FIRST IN STRUCT (see ProcSleep,ProcWakeup,etc) */
170  SHM_QUEUE links; /* list link if process is in a list */
171  PGPROC **procgloballist; /* procglobal list that owns this PGPROC */
172 
173  PGSemaphore sem; /* ONE semaphore to sleep on */
175 
176  Latch procLatch; /* generic latch for process */
177 
178 
179  TransactionId xid; /* id of top-level transaction currently being
180  * executed by this proc, if running and XID
181  * is assigned; else InvalidTransactionId.
182  * mirrored in ProcGlobal->xids[pgxactoff] */
183 
184  TransactionId xmin; /* minimal running XID as it was when we were
185  * starting our xact, excluding LAZY VACUUM:
186  * vacuum must not remove tuples deleted by
187  * xid >= xmin ! */
188 
189  LocalTransactionId lxid; /* local id of top-level transaction currently
190  * being executed by this proc, if running;
191  * else InvalidLocalTransactionId */
192  int pid; /* Backend's process ID; 0 if prepared xact */
193 
194  int pgxactoff; /* offset into various ProcGlobal->arrays with
195  * data mirrored from this PGPROC */
196 
197  int pgprocno; /* Number of this PGPROC in
198  * ProcGlobal->allProcs array. This is set
199  * once by InitProcGlobal().
200  * ProcGlobal->allProcs[n].pgprocno == n */
201 
202  /* These fields are zero while a backend is still starting up: */
203  BackendId backendId; /* This backend's backend ID (if assigned) */
204  Oid databaseId; /* OID of database this backend is using */
205  Oid roleId; /* OID of role using this backend */
206 
207  Oid tempNamespaceId; /* OID of temp schema this backend is
208  * using */
209 
210  bool isBackgroundWorker; /* true if background worker. */
211 
212  /*
213  * While in hot standby mode, shows that a conflict signal has been sent
214  * for the current transaction. Set/cleared while holding ProcArrayLock,
215  * though not required. Accessed without lock, if needed.
216  */
218 
219  /* Info about LWLock the process is currently waiting for, if any. */
220  uint8 lwWaiting; /* see LWLockWaitState */
221  uint8 lwWaitMode; /* lwlock mode being waited for */
222  proclist_node lwWaitLink; /* position in LW lock wait list */
223 
224  /* Support for condition variables. */
225  proclist_node cvWaitLink; /* position in CV wait list */
226 
227  /* Info about lock the process is currently waiting for, if any. */
228  /* waitLock and waitProcLock are NULL if not currently waiting. */
229  LOCK *waitLock; /* Lock object we're sleeping on ... */
230  PROCLOCK *waitProcLock; /* Per-holder info for awaited lock */
231  LOCKMODE waitLockMode; /* type of lock we're waiting for */
232  LOCKMASK heldLocks; /* bitmask for lock types already held on this
233  * lock object by this backend */
234  pg_atomic_uint64 waitStart; /* time at which wait for lock acquisition
235  * started */
236 
237  int delayChkptFlags; /* for DELAY_CHKPT_* flags */
238 
239  uint8 statusFlags; /* this backend's status flags, see PROC_*
240  * above. mirrored in
241  * ProcGlobal->statusFlags[pgxactoff] */
242 
243  /*
244  * Info to allow us to wait for synchronous replication, if needed.
245  * waitLSN is InvalidXLogRecPtr if not waiting; set only by user backend.
246  * syncRepState must not be touched except by owning process or WALSender.
247  * syncRepLinks used only while holding SyncRepLock.
248  */
249  XLogRecPtr waitLSN; /* waiting for this LSN or higher */
250  int syncRepState; /* wait state for sync rep */
251  SHM_QUEUE syncRepLinks; /* list link if process is in syncrep queue */
252 
253  /*
254  * All PROCLOCK objects for locks held or awaited by this backend are
255  * linked into one of these lists, according to the partition number of
256  * their lock.
257  */
259 
260  XidCacheStatus subxidStatus; /* mirrored with
261  * ProcGlobal->subxidStates[i] */
262  struct XidCache subxids; /* cache for subtransaction XIDs */
263 
264  /* Support for group XID clearing. */
265  /* true, if member of ProcArray group waiting for XID clear */
267  /* next ProcArray group member waiting for XID clear */
269 
270  /*
271  * latest transaction id among the transaction's main XID and
272  * subtransactions
273  */
275 
276  uint32 wait_event_info; /* proc's wait information */
277 
278  /* Support for group transaction status update. */
279  bool clogGroupMember; /* true, if member of clog group */
280  pg_atomic_uint32 clogGroupNext; /* next clog group member */
281  TransactionId clogGroupMemberXid; /* transaction id of clog group member */
282  XidStatus clogGroupMemberXidStatus; /* transaction status of clog
283  * group member */
284  int clogGroupMemberPage; /* clog page corresponding to
285  * transaction id of clog group member */
286  XLogRecPtr clogGroupMemberLsn; /* WAL location of commit record for clog
287  * group member */
288 
289  /* Lock manager data, recording fast-path locks taken by this backend. */
290  LWLock fpInfoLock; /* protects per-backend fast-path state */
291  uint64 fpLockBits; /* lock modes held for each fast-path slot */
292  Oid fpRelId[FP_LOCK_SLOTS_PER_BACKEND]; /* slots for rel oids */
293  bool fpVXIDLock; /* are we holding a fast-path VXID lock? */
294  LocalTransactionId fpLocalTransactionId; /* lxid for fast-path VXID
295  * lock */
296 
297  /*
298  * Support for lock groups. Use LockHashPartitionLockByProc on the group
299  * leader to get the LWLock protecting these fields.
300  */
301  PGPROC *lockGroupLeader; /* lock group leader, if I'm a member */
302  dlist_head lockGroupMembers; /* list of members, if I'm a leader */
303  dlist_node lockGroupLink; /* my member link, if I'm a member */
304 };
305 
306 /* NOTE: "typedef struct PGPROC PGPROC" appears in storage/lock.h. */
307 
308 
309 extern PGDLLIMPORT PGPROC *MyProc;
310 
311 /*
312  * There is one ProcGlobal struct for the whole database cluster.
313  *
314  * Adding/Removing an entry into the procarray requires holding *both*
315  * ProcArrayLock and XidGenLock in exclusive mode (in that order). Both are
316  * needed because the dense arrays (see below) are accessed from
317  * GetNewTransactionId() and GetSnapshotData(), and we don't want to add
318  * further contention by both using the same lock. Adding/Removing a procarray
319  * entry is much less frequent.
320  *
321  * Some fields in PGPROC are mirrored into more densely packed arrays (e.g.
322  * xids), with one entry for each backend. These arrays only contain entries
323  * for PGPROCs that have been added to the shared array with ProcArrayAdd()
324  * (in contrast to PGPROC array which has unused PGPROCs interspersed).
325  *
326  * The dense arrays are indexed by PGPROC->pgxactoff. Any concurrent
327  * ProcArrayAdd() / ProcArrayRemove() can lead to pgxactoff of a procarray
328  * member to change. Therefore it is only safe to use PGPROC->pgxactoff to
329  * access the dense array while holding either ProcArrayLock or XidGenLock.
330  *
331  * As long as a PGPROC is in the procarray, the mirrored values need to be
332  * maintained in both places in a coherent manner.
333  *
334  * The denser separate arrays are beneficial for three main reasons: First, to
335  * allow for as tight loops accessing the data as possible. Second, to prevent
336  * updates of frequently changing data (e.g. xmin) from invalidating
337  * cachelines also containing less frequently changing data (e.g. xid,
338  * statusFlags). Third to condense frequently accessed data into as few
339  * cachelines as possible.
340  *
341  * There are two main reasons to have the data mirrored between these dense
342  * arrays and PGPROC. First, as explained above, a PGPROC's array entries can
343  * only be accessed with either ProcArrayLock or XidGenLock held, whereas the
344  * PGPROC entries do not require that (obviously there may still be locking
345  * requirements around the individual field, separate from the concerns
346  * here). That is particularly important for a backend to efficiently checks
347  * it own values, which it often can safely do without locking. Second, the
348  * PGPROC fields allow to avoid unnecessary accesses and modification to the
349  * dense arrays. A backend's own PGPROC is more likely to be in a local cache,
350  * whereas the cachelines for the dense array will be modified by other
351  * backends (often removing it from the cache for other cores/sockets). At
352  * commit/abort time a check of the PGPROC value can avoid accessing/dirtying
353  * the corresponding array value.
354  *
355  * Basically it makes sense to access the PGPROC variable when checking a
356  * single backend's data, especially when already looking at the PGPROC for
357  * other reasons already. It makes sense to look at the "dense" arrays if we
358  * need to look at many / most entries, because we then benefit from the
359  * reduced indirection and better cross-process cache-ability.
360  *
361  * When entering a PGPROC for 2PC transactions with ProcArrayAdd(), the data
362  * in the dense arrays is initialized from the PGPROC while it already holds
363  * ProcArrayLock.
364  */
365 typedef struct PROC_HDR
366 {
367  /* Array of PGPROC structures (not including dummies for prepared txns) */
368  PGPROC *allProcs;
369 
370  /* Array mirroring PGPROC.xid for each PGPROC currently in the procarray */
372 
373  /*
374  * Array mirroring PGPROC.subxidStatus for each PGPROC currently in the
375  * procarray.
376  */
378 
379  /*
380  * Array mirroring PGPROC.statusFlags for each PGPROC currently in the
381  * procarray.
382  */
384 
385  /* Length of allProcs array */
387  /* Head of list of free PGPROC structures */
389  /* Head of list of autovacuum's free PGPROC structures */
391  /* Head of list of bgworker free PGPROC structures */
393  /* Head of list of walsender free PGPROC structures */
395  /* First pgproc waiting for group XID clear */
397  /* First pgproc waiting for group transaction status update */
399  /* WALWriter process's latch */
401  /* Checkpointer process's latch */
403  /* Current shared estimate of appropriate spins_per_delay value */
404  int spins_per_delay;
405  /* Buffer id of the buffer that Startup process waits for pin on, or -1 */
407 } PROC_HDR;
408 
410 
412 
413 /* Accessor for PGPROC given a pgprocno. */
414 #define GetPGProcByNumber(n) (&ProcGlobal->allProcs[(n)])
415 
416 /*
417  * We set aside some extra PGPROC structures for auxiliary processes,
418  * ie things that aren't full-fledged backends but need shmem access.
419  *
420  * Background writer, checkpointer, WAL writer and archiver run during normal
421  * operation. Startup process and WAL receiver also consume 2 slots, but WAL
422  * writer is launched only after startup has exited, so we only need 5 slots.
423  */
424 #define NUM_AUXILIARY_PROCS 5
425 
426 /* configurable options */
427 extern PGDLLIMPORT int DeadlockTimeout;
428 extern PGDLLIMPORT int StatementTimeout;
429 extern PGDLLIMPORT int LockTimeout;
432 extern PGDLLIMPORT bool log_lock_waits;
433 
434 
435 /*
436  * Function Prototypes
437  */
438 extern int ProcGlobalSemas(void);
439 extern Size ProcGlobalShmemSize(void);
440 extern void InitProcGlobal(void);
441 extern void InitProcess(void);
442 extern void InitProcessPhase2(void);
443 extern void InitAuxiliaryProcess(void);
444 
445 extern void SetStartupBufferPinWaitBufId(int bufid);
446 extern int GetStartupBufferPinWaitBufId(void);
447 
448 extern bool HaveNFreeProcs(int n);
449 extern void ProcReleaseLocks(bool isCommit);
450 
451 extern void ProcQueueInit(PROC_QUEUE *queue);
452 extern ProcWaitStatus ProcSleep(LOCALLOCK *locallock, LockMethod lockMethodTable);
453 extern PGPROC *ProcWakeup(PGPROC *proc, ProcWaitStatus waitStatus);
454 extern void ProcLockWakeup(LockMethod lockMethodTable, LOCK *lock);
455 extern void CheckDeadLockAlert(void);
456 extern bool IsWaitingForLock(void);
457 extern void LockErrorCleanup(void);
458 
459 extern void ProcWaitForSignal(uint32 wait_event_info);
460 extern void ProcSendSignal(int pgprocno);
461 
462 extern PGPROC *AuxiliaryPidGetProc(int pid);
463 
464 extern void BecomeLockGroupLeader(void);
465 extern bool BecomeLockGroupMember(PGPROC *leader, int pid);
466 
467 #endif /* _PROC_H_ */
int BackendId
Definition: backendid.h:21
unsigned int uint32
Definition: c.h:442
#define PGDLLIMPORT
Definition: c.h:1252
uint32 LocalTransactionId
Definition: c.h:590
unsigned char uint8
Definition: c.h:440
uint32 TransactionId
Definition: c.h:588
size_t Size
Definition: c.h:541
int XidStatus
Definition: clog.h:25
int LOCKMODE
Definition: lockdefs.h:26
int LOCKMASK
Definition: lockdefs.h:25
#define NUM_LOCK_PARTITIONS
Definition: lwlock.h:95
unsigned int Oid
Definition: postgres_ext.h:31
PGDLLIMPORT int IdleInTransactionSessionTimeout
Definition: proc.c:63
void ProcSendSignal(int pgprocno)
Definition: proc.c:1890
Size ProcGlobalShmemSize(void)
Definition: proc.c:102
bool IsWaitingForLock(void)
Definition: proc.c:682
PGDLLIMPORT int IdleSessionTimeout
Definition: proc.c:64
void InitAuxiliaryProcess(void)
Definition: proc.c:515
PGDLLIMPORT PROC_HDR * ProcGlobal
Definition: proc.c:80
#define FP_LOCK_SLOTS_PER_BACKEND
Definition: proc.h:79
int GetStartupBufferPinWaitBufId(void)
Definition: proc.c:645
PGPROC * ProcWakeup(PGPROC *proc, ProcWaitStatus waitStatus)
Definition: proc.c:1670
PGDLLIMPORT PGPROC * MyProc
Definition: proc.c:68
void ProcLockWakeup(LockMethod lockMethodTable, LOCK *lock)
Definition: proc.c:1707
struct PROC_HDR PROC_HDR
#define PGPROC_MAX_CACHED_SUBXIDS
Definition: proc.h:38
int ProcGlobalSemas(void)
Definition: proc.c:124
void ProcReleaseLocks(bool isCommit)
Definition: proc.c:775
void LockErrorCleanup(void)
Definition: proc.c:699
bool BecomeLockGroupMember(PGPROC *leader, int pid)
Definition: proc.c:1935
PGDLLIMPORT int StatementTimeout
Definition: proc.c:61
void BecomeLockGroupLeader(void)
Definition: proc.c:1905
PGDLLIMPORT int DeadlockTimeout
Definition: proc.c:60
PGPROC * AuxiliaryPidGetProc(int pid)
Definition: proc.c:968
PGDLLIMPORT int LockTimeout
Definition: proc.c:62
void InitProcess(void)
Definition: proc.c:301
void CheckDeadLockAlert(void)
Definition: proc.c:1852
void InitProcessPhase2(void)
Definition: proc.c:480
void InitProcGlobal(void)
Definition: proc.c:159
ProcWaitStatus ProcSleep(LOCALLOCK *locallock, LockMethod lockMethodTable)
Definition: proc.c:1045
PGDLLIMPORT bool log_lock_waits
Definition: proc.c:65
ProcWaitStatus
Definition: proc.h:123
@ PROC_WAIT_STATUS_OK
Definition: proc.h:124
@ PROC_WAIT_STATUS_WAITING
Definition: proc.h:125
@ PROC_WAIT_STATUS_ERROR
Definition: proc.h:126
void ProcQueueInit(PROC_QUEUE *queue)
Definition: proc.c:1021
PGDLLIMPORT PGPROC * PreparedXactProcs
Definition: proc.c:82
struct XidCacheStatus XidCacheStatus
bool HaveNFreeProcs(int n)
Definition: proc.c:659
void SetStartupBufferPinWaitBufId(int bufid)
Definition: proc.c:633
void ProcWaitForSignal(uint32 wait_event_info)
Definition: proc.c:1878
Definition: lock.h:301
Definition: lwlock.h:40
Definition: latch.h:111
Definition: proc.h:162
PGPROC ** procgloballist
Definition: proc.h:165
LWLock fpInfoLock
Definition: proc.h:284
TransactionId xmin
Definition: proc.h:178
Oid fpRelId[FP_LOCK_SLOTS_PER_BACKEND]
Definition: proc.h:286
bool procArrayGroupMember
Definition: proc.h:260
LocalTransactionId lxid
Definition: proc.h:183
PROCLOCK * waitProcLock
Definition: proc.h:224
SHM_QUEUE links
Definition: proc.h:164
uint64 fpLockBits
Definition: proc.h:285
XLogRecPtr clogGroupMemberLsn
Definition: proc.h:280
pg_atomic_uint32 procArrayGroupNext
Definition: proc.h:262
uint8 lwWaitMode
Definition: proc.h:215
dlist_head lockGroupMembers
Definition: proc.h:296
int clogGroupMemberPage
Definition: proc.h:278
uint32 wait_event_info
Definition: proc.h:270
uint8 statusFlags
Definition: proc.h:233
bool recoveryConflictPending
Definition: proc.h:211
TransactionId clogGroupMemberXid
Definition: proc.h:275
Oid databaseId
Definition: proc.h:198
bool clogGroupMember
Definition: proc.h:273
pg_atomic_uint64 waitStart
Definition: proc.h:228
bool fpVXIDLock
Definition: proc.h:287
BackendId backendId
Definition: proc.h:197
int pid
Definition: proc.h:186
XLogRecPtr waitLSN
Definition: proc.h:243
bool isBackgroundWorker
Definition: proc.h:204
int syncRepState
Definition: proc.h:244
pg_atomic_uint32 clogGroupNext
Definition: proc.h:274
dlist_node lockGroupLink
Definition: proc.h:297
SHM_QUEUE syncRepLinks
Definition: proc.h:245
XidStatus clogGroupMemberXidStatus
Definition: proc.h:276
int pgxactoff
Definition: proc.h:188
XidCacheStatus subxidStatus
Definition: proc.h:254
LOCK * waitLock
Definition: proc.h:223
proclist_node lwWaitLink
Definition: proc.h:216
TransactionId xid
Definition: proc.h:173
LOCKMODE waitLockMode
Definition: proc.h:225
int pgprocno
Definition: proc.h:191
struct XidCache subxids
Definition: proc.h:256
int delayChkptFlags
Definition: proc.h:231
PGPROC * lockGroupLeader
Definition: proc.h:295
LocalTransactionId fpLocalTransactionId
Definition: proc.h:288
TransactionId procArrayGroupMemberXid
Definition: proc.h:268
LOCKMASK heldLocks
Definition: proc.h:226
PGSemaphore sem
Definition: proc.h:167
Oid roleId
Definition: proc.h:199
ProcWaitStatus waitStatus
Definition: proc.h:168
proclist_node cvWaitLink
Definition: proc.h:219
Oid tempNamespaceId
Definition: proc.h:201
uint8 lwWaiting
Definition: proc.h:214
SHM_QUEUE myProcLocks[NUM_LOCK_PARTITIONS]
Definition: proc.h:252
Latch procLatch
Definition: proc.h:170
Definition: lock.h:362
Definition: proc.h:360
uint8 * statusFlags
Definition: proc.h:377
XidCacheStatus * subxidStates
Definition: proc.h:371
PGPROC * walsenderFreeProcs
Definition: proc.h:388
Latch * walwriterLatch
Definition: proc.h:394
PGPROC * autovacFreeProcs
Definition: proc.h:384
PGPROC * bgworkerFreeProcs
Definition: proc.h:386
PGPROC * freeProcs
Definition: proc.h:382
int startupBufferPinWaitBufId
Definition: proc.h:400
PGPROC * allProcs
Definition: proc.h:362
pg_atomic_uint32 clogGroupFirst
Definition: proc.h:392
int spins_per_delay
Definition: proc.h:398
TransactionId * xids
Definition: proc.h:365
Latch * checkpointerLatch
Definition: proc.h:396
pg_atomic_uint32 procArrayGroupFirst
Definition: proc.h:390
uint32 allProcCount
Definition: proc.h:380
bool overflowed
Definition: proc.h:45
uint8 count
Definition: proc.h:43
Definition: proc.h:49
TransactionId xids[PGPROC_MAX_CACHED_SUBXIDS]
Definition: proc.h:50
uint64 XLogRecPtr
Definition: xlogdefs.h:21