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* -HOLDER/HOLDERTAB rename to PROCLOCK/PROCLOCKTAG
This commit is contained in:
Bruce Momjian
2002-07-19 00:17:40 +00:00
parent 97377048b4
commit b75fcf9326
6 changed files with 196 additions and 190 deletions
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30
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 1.62 2002/07/18 23:06:20 momjian Exp $
* $Id: lock.h,v 1.63 2002/07/19 00:17:40 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -130,7 +130,7 @@ typedef struct LOCKTAG
* tag -- uniquely identifies the object being locked
* grantMask -- bitmask for all lock types currently granted on this object.
* waitMask -- bitmask for all lock types currently awaited on this object.
* lockHolders -- list of HOLDER objects for this lock.
* lockHolders -- list of PROCLOCK objects for this lock.
* waitProcs -- queue of processes waiting for this lock.
* requested -- count of each lock type currently requested on the lock
* (includes requests already granted!!).
@@ -146,7 +146,7 @@ typedef struct LOCK
/* data */
int grantMask; /* bitmask for lock types already granted */
int waitMask; /* bitmask for lock types awaited */
SHM_QUEUE lockHolders; /* list of HOLDER objects assoc. with lock */
SHM_QUEUE lockHolders; /* list of PROCLOCK objects assoc. with lock */
PROC_QUEUE waitProcs; /* list of PGPROC objects waiting on lock */
int requested[MAX_LOCKMODES]; /* counts of requested
* locks */
@@ -163,8 +163,8 @@ typedef struct LOCK
* on the same lockable object. We need to store some per-holder information
* for each such holder (or would-be holder).
*
* HOLDERTAG is the key information needed to look up a HOLDER item in the
* holder hashtable. A HOLDERTAG value uniquely identifies a lock holder.
* PROCLOCKTAG is the key information needed to look up a PROCLOCK item in the
* holder hashtable. A PROCLOCKTAG value uniquely identifies a lock holder.
*
* There are two possible kinds of holder tags: a transaction (identified
* both by the PGPROC of the backend running it, and the xact's own ID) and
@@ -180,32 +180,32 @@ typedef struct LOCK
* Otherwise, holder objects whose counts have gone to zero are recycled
* as soon as convenient.
*
* Each HOLDER object is linked into lists for both the associated LOCK object
* and the owning PGPROC object. Note that the HOLDER is entered into these
* Each PROCLOCK object is linked into lists for both the associated LOCK object
* and the owning PGPROC object. Note that the PROCLOCK is entered into these
* lists as soon as it is created, even if no lock has yet been granted.
* A PGPROC that is waiting for a lock to be granted will also be linked into
* the lock's waitProcs queue.
*/
typedef struct HOLDERTAG
typedef struct PROCLOCKTAG
{
SHMEM_OFFSET lock; /* link to per-lockable-object information */
SHMEM_OFFSET proc; /* link to PGPROC of owning backend */
TransactionId xid; /* xact ID, or InvalidTransactionId */
} HOLDERTAG;
} PROCLOCKTAG;
typedef struct HOLDER
typedef struct PROCLOCK
{
/* tag */
HOLDERTAG tag; /* unique identifier of holder object */
PROCLOCKTAG tag; /* unique identifier of holder object */
/* data */
int holding[MAX_LOCKMODES]; /* count of locks currently held */
int nHolding; /* total of holding[] array */
SHM_QUEUE lockLink; /* list link for lock's list of holders */
SHM_QUEUE procLink; /* list link for process's list of holders */
} HOLDER;
} PROCLOCK;
#define HOLDER_LOCKMETHOD(holder) \
#define PROCLOCK_LOCKMETHOD(holder) \
(((LOCK *) MAKE_PTR((holder).tag.lock))->tag.lockmethod)
@@ -225,9 +225,9 @@ extern bool LockReleaseAll(LOCKMETHOD lockmethod, PGPROC *proc,
bool allxids, TransactionId xid);
extern int LockCheckConflicts(LOCKMETHODTABLE *lockMethodTable,
LOCKMODE lockmode,
LOCK *lock, HOLDER *holder, PGPROC *proc,
LOCK *lock, PROCLOCK *holder, PGPROC *proc,
int *myHolding);
extern void GrantLock(LOCK *lock, HOLDER *holder, LOCKMODE lockmode);
extern void GrantLock(LOCK *lock, PROCLOCK *holder, LOCKMODE lockmode);
extern void RemoveFromWaitQueue(PGPROC *proc);
extern int LockShmemSize(int maxBackends);
extern bool DeadLockCheck(PGPROC *proc);