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Code review for pg_locks feature. Make shmemoffset of PROCLOCK structs

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available (else there's no way to interpret the list links).  Change
pg_locks view to show transaction ID locks separately from ordinary
relation locks.  Avoid showing N duplicate rows when the same lock is
held multiple times (seems unlikely that users care about exact hold
count).  Improve documentation.
This commit is contained in:
Tom Lane
2002-08-31 17:14:28 +00:00
parent 642fd38e42
commit 1bab464eb4
7 changed files with 213 additions and 164 deletions
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23
src/include/storage/lock.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: lock.h,v 1.65 2002/08/17 13:04:18 momjian Exp $
* $Id: lock.h,v 1.66 2002/08/31 17:14:28 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -204,19 +204,20 @@ typedef struct PROCLOCK
(((LOCK *) MAKE_PTR((holder).tag.lock))->tag.lockmethod)
/*
* This struct is used to encapsulate information passed from lmgr
* internals to the lock listing statistical functions (lockfuncs.c).
* It's just a convenient bundle of other lock.h structures. All
* the information at a given index (holders[i], procs[i], locks[i])
* is related.
* This struct holds information passed from lmgr internals to the lock
* listing user-level functions (lockfuncs.c). For each PROCLOCK in the
* system, the SHMEM_OFFSET, PROCLOCK itself, and associated PGPROC and
* LOCK objects are stored. (Note there will often be multiple copies
* of the same PGPROC or LOCK.) We do not store the SHMEM_OFFSET of the
* PGPROC or LOCK separately, since they're in the PROCLOCK's tag fields.
*/
typedef struct
{
int nelements; /* The length of holders, procs, & locks */
int currIdx; /* Current element being examined */
int nelements; /* The length of each of the arrays */
SHMEM_OFFSET *holderaddrs;
PROCLOCK *holders;
PGPROC *procs;
LOCK *locks;
PROCLOCK *holders;
} LockData;
/*
@@ -242,8 +243,8 @@ extern void RemoveFromWaitQueue(PGPROC *proc);
extern int LockShmemSize(int maxBackends);
extern bool DeadLockCheck(PGPROC *proc);
extern void InitDeadLockChecking(void);
extern void GetLockStatusData(LockData *data);
extern char *GetLockmodeName(LOCKMODE mode);
extern LockData *GetLockStatusData(void);
extern const char *GetLockmodeName(LOCKMODE mode);
#ifdef LOCK_DEBUG
extern void DumpLocks(void);