Try to reduce confusion about what is a lock method identifier, a lock
method control structure, or a table of control structures.
. Use type LOCKMASK where an int is not a counter.
. Get rid of INVALID_TABLEID, use INVALID_LOCKMETHOD instead.
. Use INVALID_LOCKMETHOD instead of (LOCKMETHOD) NULL, because
LOCKMETHOD is not a pointer.
. Define and use macro LockMethodIsValid.
. Rename LOCKMETHOD to LOCKMETHODID.
. Remove global variable LongTermTableId in lmgr.c, because it is
never used.
. Make LockTableId static in lmgr.c, because it is used nowhere else.
Why not remove it and use DEFAULT_LOCKMETHOD?
. Rename the lock method control structure from LOCKMETHODTABLE to
LockMethodData. Introduce a pointer type named LockMethod.
. Remove elog(FATAL) after InitLockTable() call in
CreateSharedMemoryAndSemaphores(), because if something goes wrong,
there is elog(FATAL) in LockMethodTableInit(), and if this doesn't
help, an elog(ERROR) in InitLockTable() is promoted to FATAL.
. Make InitLockTable() void, because its only caller does not use its
return value any more.
. Rename variables in lock.c to avoid statements like
LockMethodTable[NumLockMethods] = lockMethodTable;
lockMethodTable = LockMethodTable[lockmethod];
. Change LOCKMETHODID type to uint16 to fit into struct LOCKTAG.
. Remove static variables BITS_OFF and BITS_ON from lock.c, because
I agree to this doubt:
* XXX is a fetch from a static array really faster than a shift?
======================
All 93 tests passed.
======================
Servus
Manfred
diff -ruN ../base/src/backend/storage/ipc/ipci.c src/backend/storage/ipc/ipci.c
--- ../base/src/backend/storage/ipc/ipci.c 2003-08-04 04:40:03.000000000 +0200
+++ src/backend/storage/ipc/ipci.c 2003-09-06 16:53:54.000000000 +0200
@@ -111,8 +111,7 @@
* Set up lock manager
*/
InitLocks();
- if (InitLockTable(maxBackends) == INVALID_TABLEID)
- elog(FATAL, "could not create the lock table");
+ InitLockTable(maxBackends);
/*
* Set up process table
diff -ruN ../base/src/backend/storage/lmgr/deadlock.c
src/backend/storage/lmgr/deadlock.c
--- ../base/src/backend/storage/lmgr/deadlock.c 2003-08-08 23:42:00.000000000 +0200
+++ src/backend/storage/lmgr/deadlock.c 2003-09-06 22:25:46.000000000 +0200
@@ -428,7 +428,7 @@
LOCK *lock;
PROCLOCK *proclock;
SHM_QUEUE *lockHolders;
- LOCKMETHODTABLE *lockMethodTable;
+ LockMethod lockMethodTable;
PROC_QUEUE *waitQueue;
int queue_size;
int conflictMask;
diff -ruN ../base/src/backend/storage/lmgr/lmgr.c src/backend/storage/lmgr/lmgr.c
--- ../base/src/backend/storage/lmgr/lmgr.c 2003-08-18 00:41:12.000000000 +0200
+++ src/backend/storage/lmgr/lmgr.c 2003-09-06 18:10:48.000000000 +0200
@@ -65,26 +65,24 @@
};
-LOCKMETHOD LockTableId = (LOCKMETHOD) NULL;
-LOCKMETHOD LongTermTableId = (LOCKMETHOD) NULL;
+static LOCKMETHODID LockTableId = INVALID_LOCKMETHOD;
/*
* Create the lock table described by LockConflicts
*/
-LOCKMETHOD
+void
InitLockTable(int maxBackends)
{
- int lockmethod;
+ LOCKMETHODID LongTermTableId;
/* number of lock modes is lengthof()-1 because of dummy zero */
- lockmethod = LockMethodTableInit("LockTable",
- LockConflicts,
-
lengthof(LockConflicts) - 1,
- maxBackends);
- LockTableId = lockmethod;
-
- if (!(LockTableId))
+ LockTableId = LockMethodTableInit("LockTable",
+
LockConflicts,
+
lengthof(LockConflicts) - 1,
+ maxBackends);
+ if (!LockMethodIsValid(LockTableId))
elog(ERROR, "could not initialize lock table");
+ Assert(LockTableId == DEFAULT_LOCKMETHOD);
#ifdef USER_LOCKS
@@ -92,11 +90,10 @@
* Allocate another tableId for long-term locks
*/
LongTermTableId = LockMethodTableRename(LockTableId);
- if (!(LongTermTableId))
+ if (!LockMethodIsValid(LongTermTableId))
elog(ERROR, "could not rename long-term lock table");
+ Assert(LongTermTableId == USER_LOCKMETHOD);
#endif
-
- return LockTableId;
}
/*
diff -ruN ../base/src/backend/storage/lmgr/lock.c src/backend/storage/lmgr/lock.c
--- ../base/src/backend/storage/lmgr/lock.c 2003-08-18 00:41:12.000000000 +0200
+++ src/backend/storage/lmgr/lock.c 2003-09-06 23:01:05.000000000 +0200
@@ -46,7 +46,7 @@
#define NLOCKENTS(maxBackends) (max_locks_per_xact * (maxBackends))
-static int WaitOnLock(LOCKMETHOD lockmethod, LOCKMODE lockmode,
+static int WaitOnLock(LOCKMETHODID lockmethodid, LOCKMODE lockmode,
LOCK *lock, PROCLOCK *proclock);
static void LockCountMyLocks(SHMEM_OFFSET lockOffset, PGPROC *proc,
int *myHolding);
@@ -150,19 +150,15 @@
/*
- * These are to simplify/speed up some bit arithmetic.
- *
- * XXX is a fetch from a static array really faster than a shift?
- * Wouldn't bet on it...
+ * These are to simplify some bit arithmetic.
*/
-
-static LOCKMASK BITS_OFF[MAX_LOCKMODES];
-static LOCKMASK BITS_ON[MAX_LOCKMODES];
+#define BITS_ON(i) (1 << (i))
+#define BITS_OFF(i) ~(1 << (i))
/*
- * map from lockmethod to the lock table structure
+ * map from lock method id to the lock table structure
*/
-static LOCKMETHODTABLE *LockMethodTable[MAX_LOCK_METHODS];
+static LockMethod LockMethods[MAX_LOCK_METHODS];
static int NumLockMethods;
@@ -173,28 +169,20 @@
void
InitLocks(void)
{
- int i;
- int bit;
-
- bit = 1;
- for (i = 0; i < MAX_LOCKMODES; i++, bit <<= 1)
- {
- BITS_ON[i] = bit;
- BITS_OFF[i] = ~bit;
- }
+ /* NOP */
}
/*
* Fetch the lock method table associated with a given lock
*/
-LOCKMETHODTABLE *
+LockMethod
GetLocksMethodTable(LOCK *lock)
{
- LOCKMETHOD lockmethod = LOCK_LOCKMETHOD(*lock);
+ LOCKMETHODID lockmethodid = LOCK_LOCKMETHOD(*lock);
- Assert(lockmethod > 0 && lockmethod < NumLockMethods);
- return LockMethodTable[lockmethod];
+ Assert(0 < lockmethodid && lockmethodid < NumLockMethods);
+ return LockMethods[lockmethodid];
}
@@ -205,7 +193,7 @@
* Notes: just copying. Should only be called once.
*/
static void
-LockMethodInit(LOCKMETHODTABLE *lockMethodTable,
+LockMethodInit(LockMethod lockMethodTable,
LOCKMASK *conflictsP,
int numModes)
{
@@ -226,13 +214,13 @@
* by the postmaster are inherited by each backend, so they must be in
* TopMemoryContext.
*/
-LOCKMETHOD
+LOCKMETHODID
LockMethodTableInit(char *tabName,
LOCKMASK *conflictsP,
int numModes,
int maxBackends)
{
- LOCKMETHODTABLE *lockMethodTable;
+ LockMethod newLockMethod;
char *shmemName;
HASHCTL info;
int hash_flags;
@@ -254,10 +242,10 @@
/* each lock table has a header in shared memory */
sprintf(shmemName, "%s (lock method table)", tabName);
- lockMethodTable = (LOCKMETHODTABLE *)
- ShmemInitStruct(shmemName, sizeof(LOCKMETHODTABLE), &found);
+ newLockMethod = (LockMethod)
+ ShmemInitStruct(shmemName, sizeof(LockMethodData), &found);
- if (!lockMethodTable)
+ if (!newLockMethod)
elog(FATAL, "could not initialize lock table \"%s\"", tabName);
/*
@@ -275,15 +263,15 @@
*/
if (!found)
{
- MemSet(lockMethodTable, 0, sizeof(LOCKMETHODTABLE));
- lockMethodTable->masterLock = LockMgrLock;
- lockMethodTable->lockmethod = NumLockMethods;
+ MemSet(newLockMethod, 0, sizeof(LockMethodData));
+ newLockMethod->masterLock = LockMgrLock;
+ newLockMethod->lockmethodid = NumLockMethods;
}
/*
* other modules refer to the lock table by a lockmethod ID
*/
- LockMethodTable[NumLockMethods] = lockMethodTable;
+ LockMethods[NumLockMethods] = newLockMethod;
NumLockMethods++;
Assert(NumLockMethods <= MAX_LOCK_METHODS);
@@ -297,15 +285,15 @@
hash_flags = (HASH_ELEM | HASH_FUNCTION);
sprintf(shmemName, "%s (lock hash)", tabName);
- lockMethodTable->lockHash = ShmemInitHash(shmemName,
-
init_table_size,
-
max_table_size,
-
&info,
-
hash_flags);
+ newLockMethod->lockHash = ShmemInitHash(shmemName,
+
init_table_size,
+
max_table_size,
+
&info,
+
hash_flags);
- if (!lockMethodTable->lockHash)
+ if (!newLockMethod->lockHash)
elog(FATAL, "could not initialize lock table \"%s\"", tabName);
- Assert(lockMethodTable->lockHash->hash == tag_hash);
+ Assert(newLockMethod->lockHash->hash == tag_hash);
/*
* allocate a hash table for PROCLOCK structs. This is used to store
@@ -317,23 +305,23 @@
hash_flags = (HASH_ELEM | HASH_FUNCTION);
sprintf(shmemName, "%s (proclock hash)", tabName);
- lockMethodTable->proclockHash = ShmemInitHash(shmemName,
-
init_table_size,
-
max_table_size,
-
&info,
-
hash_flags);
+ newLockMethod->proclockHash = ShmemInitHash(shmemName,
+
init_table_size,
+
max_table_size,
+
&info,
+
hash_flags);
- if (!lockMethodTable->proclockHash)
+ if (!newLockMethod->proclockHash)
elog(FATAL, "could not initialize lock table \"%s\"", tabName);
/* init data structures */
- LockMethodInit(lockMethodTable, conflictsP, numModes);
+ LockMethodInit(newLockMethod, conflictsP, numModes);
LWLockRelease(LockMgrLock);
pfree(shmemName);
- return lockMethodTable->lockmethod;
+ return newLockMethod->lockmethodid;
}
/*
@@ -349,22 +337,22 @@
* short term and long term locks, yet store them all in one hashtable.
*/
-LOCKMETHOD
-LockMethodTableRename(LOCKMETHOD lockmethod)
+LOCKMETHODID
+LockMethodTableRename(LOCKMETHODID lockmethodid)
{
- LOCKMETHOD newLockMethod;
+ LOCKMETHODID newLockMethodId;
if (NumLockMethods >= MAX_LOCK_METHODS)
return INVALID_LOCKMETHOD;
- if (LockMethodTable[lockmethod] == INVALID_LOCKMETHOD)
+ if (LockMethods[lockmethodid] == INVALID_LOCKMETHOD)
return INVALID_LOCKMETHOD;
/* other modules refer to the lock table by a lockmethod ID */
- newLockMethod = NumLockMethods;
+ newLockMethodId = NumLockMethods;
NumLockMethods++;
- LockMethodTable[newLockMethod] = LockMethodTable[lockmethod];
- return newLockMethod;
+ LockMethods[newLockMethodId] = LockMethods[lockmethodid];
+ return newLockMethodId;
}
/*
@@ -412,7 +400,7 @@
*
* normal
lock user lock
*
- * lockmethod 1
2
+ * lockmethodid 1
2
* tag.dbId database oid
database oid
* tag.relId rel oid or 0
0
* tag.objId block id
lock id2
@@ -429,7 +417,7 @@
*/
bool
-LockAcquire(LOCKMETHOD lockmethod, LOCKTAG *locktag,
+LockAcquire(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
TransactionId xid, LOCKMODE lockmode, bool dontWait)
{
PROCLOCK *proclock;
@@ -438,25 +426,25 @@
bool found;
LOCK *lock;
LWLockId masterLock;
- LOCKMETHODTABLE *lockMethodTable;
+ LockMethod lockMethodTable;
int status;
int myHolding[MAX_LOCKMODES];
int i;
#ifdef LOCK_DEBUG
- if (lockmethod == USER_LOCKMETHOD && Trace_userlocks)
+ if (lockmethodid == USER_LOCKMETHOD && Trace_userlocks)
elog(LOG, "LockAcquire: user lock [%u] %s",
locktag->objId.blkno, lock_mode_names[lockmode]);
#endif
/* ???????? This must be changed when short term locks will be used */
- locktag->lockmethod = lockmethod;
+ locktag->lockmethodid = lockmethodid;
- Assert(lockmethod < NumLockMethods);
- lockMethodTable = LockMethodTable[lockmethod];
+ Assert(lockmethodid < NumLockMethods);
+ lockMethodTable = LockMethods[lockmethodid];
if (!lockMethodTable)
{
- elog(WARNING, "bad lock table id: %d", lockmethod);
+ elog(WARNING, "bad lock table id: %d", lockmethodid);
return FALSE;
}
@@ -682,7 +670,7 @@
/*
* Sleep till someone wakes me up.
*/
- status = WaitOnLock(lockmethod, lockmode, lock, proclock);
+ status = WaitOnLock(lockmethodid, lockmode, lock, proclock);
/*
* NOTE: do not do any material change of state between here and
@@ -729,7 +717,7 @@
* known. If NULL is passed then these values will be computed internally.
*/
int
-LockCheckConflicts(LOCKMETHODTABLE *lockMethodTable,
+LockCheckConflicts(LockMethod lockMethodTable,
LOCKMODE lockmode,
LOCK *lock,
PROCLOCK *proclock,
@@ -842,9 +830,9 @@
{
lock->nGranted++;
lock->granted[lockmode]++;
- lock->grantMask |= BITS_ON[lockmode];
+ lock->grantMask |= BITS_ON(lockmode);
if (lock->granted[lockmode] == lock->requested[lockmode])
- lock->waitMask &= BITS_OFF[lockmode];
+ lock->waitMask &= BITS_OFF(lockmode);
LOCK_PRINT("GrantLock", lock, lockmode);
Assert((lock->nGranted > 0) && (lock->granted[lockmode] > 0));
Assert(lock->nGranted <= lock->nRequested);
@@ -862,14 +850,14 @@
* The locktable's masterLock must be held at entry.
*/
static int
-WaitOnLock(LOCKMETHOD lockmethod, LOCKMODE lockmode,
+WaitOnLock(LOCKMETHODID lockmethodid, LOCKMODE lockmode,
LOCK *lock, PROCLOCK *proclock)
{
- LOCKMETHODTABLE *lockMethodTable = LockMethodTable[lockmethod];
+ LockMethod lockMethodTable = LockMethods[lockmethodid];
char *new_status,
*old_status;
- Assert(lockmethod < NumLockMethods);
+ Assert(lockmethodid < NumLockMethods);
LOCK_PRINT("WaitOnLock: sleeping on lock", lock, lockmode);
@@ -957,7 +945,7 @@
waitLock->requested[lockmode]--;
/* don't forget to clear waitMask bit if appropriate */
if (waitLock->granted[lockmode] == waitLock->requested[lockmode])
- waitLock->waitMask &= BITS_OFF[lockmode];
+ waitLock->waitMask &= BITS_OFF(lockmode);
/* Clean up the proc's own state */
proc->waitLock = NULL;
@@ -968,7 +956,7 @@
}
/*
- * LockRelease -- look up 'locktag' in lock table 'lockmethod' and
+ * LockRelease -- look up 'locktag' in lock table 'lockmethodid' and
* release one 'lockmode' lock on it.
*
* Side Effects: find any waiting processes that are now wakable,
@@ -978,27 +966,27 @@
* come along and request the lock.)
*/
bool
-LockRelease(LOCKMETHOD lockmethod, LOCKTAG *locktag,
+LockRelease(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
TransactionId xid, LOCKMODE lockmode)
{
LOCK *lock;
LWLockId masterLock;
- LOCKMETHODTABLE *lockMethodTable;
+ LockMethod lockMethodTable;
PROCLOCK *proclock;
PROCLOCKTAG proclocktag;
HTAB *proclockTable;
bool wakeupNeeded = false;
#ifdef LOCK_DEBUG
- if (lockmethod == USER_LOCKMETHOD && Trace_userlocks)
+ if (lockmethodid == USER_LOCKMETHOD && Trace_userlocks)
elog(LOG, "LockRelease: user lock tag [%u] %d", locktag->objId.blkno,
lockmode);
#endif
/* ???????? This must be changed when short term locks will be used */
- locktag->lockmethod = lockmethod;
+ locktag->lockmethodid = lockmethodid;
- Assert(lockmethod < NumLockMethods);
- lockMethodTable = LockMethodTable[lockmethod];
+ Assert(lockmethodid < NumLockMethods);
+ lockMethodTable = LockMethods[lockmethodid];
if (!lockMethodTable)
{
elog(WARNING, "lockMethodTable is null in LockRelease");
@@ -1045,7 +1033,7 @@
{
LWLockRelease(masterLock);
#ifdef USER_LOCKS
- if (lockmethod == USER_LOCKMETHOD)
+ if (lockmethodid == USER_LOCKMETHOD)
elog(WARNING, "no lock with this tag");
else
#endif
@@ -1083,7 +1071,7 @@
if (lock->granted[lockmode] == 0)
{
/* change the conflict mask. No more of this lock type. */
- lock->grantMask &= BITS_OFF[lockmode];
+ lock->grantMask &= BITS_OFF(lockmode);
}
LOCK_PRINT("LockRelease: updated", lock, lockmode);
@@ -1173,29 +1161,29 @@
* specified XID are released.
*/
bool
-LockReleaseAll(LOCKMETHOD lockmethod, PGPROC *proc,
+LockReleaseAll(LOCKMETHODID lockmethodid, PGPROC *proc,
bool allxids, TransactionId xid)
{
SHM_QUEUE *procHolders = &(proc->procHolders);
PROCLOCK *proclock;
PROCLOCK *nextHolder;
LWLockId masterLock;
- LOCKMETHODTABLE *lockMethodTable;
+ LockMethod lockMethodTable;
int i,
numLockModes;
LOCK *lock;
#ifdef LOCK_DEBUG
- if (lockmethod == USER_LOCKMETHOD ? Trace_userlocks : Trace_locks)
+ if (lockmethodid == USER_LOCKMETHOD ? Trace_userlocks : Trace_locks)
elog(LOG, "LockReleaseAll: lockmethod=%d, pid=%d",
- lockmethod, proc->pid);
+ lockmethodid, proc->pid);
#endif
- Assert(lockmethod < NumLockMethods);
- lockMethodTable = LockMethodTable[lockmethod];
+ Assert(lockmethodid < NumLockMethods);
+ lockMethodTable = LockMethods[lockmethodid];
if (!lockMethodTable)
{
- elog(WARNING, "bad lock method: %d", lockmethod);
+ elog(WARNING, "bad lock method: %d", lockmethodid);
return FALSE;
}
@@ -1220,7 +1208,7 @@
lock = (LOCK *) MAKE_PTR(proclock->tag.lock);
/* Ignore items that are not of the lockmethod to be removed */
- if (LOCK_LOCKMETHOD(*lock) != lockmethod)
+ if (LOCK_LOCKMETHOD(*lock) != lockmethodid)
goto next_item;
/* If not allxids, ignore items that are of the wrong xid */
@@ -1249,7 +1237,7 @@
lock->granted[i] -= proclock->holding[i];
Assert(lock->requested[i] >= 0 &&
lock->granted[i] >= 0);
if (lock->granted[i] == 0)
- lock->grantMask &= BITS_OFF[i];
+ lock->grantMask &= BITS_OFF(i);
/*
* Read comments in LockRelease
@@ -1331,7 +1319,7 @@
LWLockRelease(masterLock);
#ifdef LOCK_DEBUG
- if (lockmethod == USER_LOCKMETHOD ? Trace_userlocks : Trace_locks)
+ if (lockmethodid == USER_LOCKMETHOD ? Trace_userlocks : Trace_locks)
elog(LOG, "LockReleaseAll done");
#endif
@@ -1346,7 +1334,7 @@
size += MAXALIGN(sizeof(PROC_HDR)); /* ProcGlobal */
size += maxBackends * MAXALIGN(sizeof(PGPROC)); /* each MyProc */
- size += MAX_LOCK_METHODS * MAXALIGN(sizeof(LOCKMETHODTABLE)); /*
each lockMethodTable */
+ size += MAX_LOCK_METHODS * MAXALIGN(sizeof(LockMethodData)); /*
each lock method */
/* lockHash table */
size += hash_estimate_size(max_table_size, sizeof(LOCK));
@@ -1390,7 +1378,7 @@
LWLockAcquire(LockMgrLock, LW_EXCLUSIVE);
- proclockTable = LockMethodTable[DEFAULT_LOCKMETHOD]->proclockHash;
+ proclockTable = LockMethods[DEFAULT_LOCKMETHOD]->proclockHash;
data->nelements = i = proclockTable->hctl->nentries;
@@ -1446,8 +1434,8 @@
SHM_QUEUE *procHolders;
PROCLOCK *proclock;
LOCK *lock;
- int lockmethod = DEFAULT_LOCKMETHOD;
- LOCKMETHODTABLE *lockMethodTable;
+ int lockmethodid = DEFAULT_LOCKMETHOD;
+ LockMethod lockMethodTable;
proc = MyProc;
if (proc == NULL)
@@ -1455,8 +1443,8 @@
procHolders = &proc->procHolders;
- Assert(lockmethod < NumLockMethods);
- lockMethodTable = LockMethodTable[lockmethod];
+ Assert(lockmethodid < NumLockMethods);
+ lockMethodTable = LockMethods[lockmethodid];
if (!lockMethodTable)
return;
@@ -1489,8 +1477,8 @@
PGPROC *proc;
PROCLOCK *proclock;
LOCK *lock;
- int lockmethod = DEFAULT_LOCKMETHOD;
- LOCKMETHODTABLE *lockMethodTable;
+ int lockmethodid = DEFAULT_LOCKMETHOD;
+ LockMethod lockMethodTable;
HTAB *proclockTable;
HASH_SEQ_STATUS status;
@@ -1498,8 +1486,8 @@
if (proc == NULL)
return;
- Assert(lockmethod < NumLockMethods);
- lockMethodTable = LockMethodTable[lockmethod];
+ Assert(lockmethodid < NumLockMethods);
+ lockMethodTable = LockMethods[lockmethodid];
if (!lockMethodTable)
return;
diff -ruN ../base/src/backend/storage/lmgr/proc.c src/backend/storage/lmgr/proc.c
--- ../base/src/backend/storage/lmgr/proc.c 2003-08-04 04:40:03.000000000 +0200
+++ src/backend/storage/lmgr/proc.c 2003-09-06 22:43:50.000000000 +0200
@@ -524,7 +524,7 @@
* semaphore is normally zero, so when we try to acquire it, we sleep.
*/
int
-ProcSleep(LOCKMETHODTABLE *lockMethodTable,
+ProcSleep(LockMethod lockMethodTable,
LOCKMODE lockmode,
LOCK *lock,
PROCLOCK *proclock)
@@ -750,7 +750,7 @@
* for lock, waken any that are no longer blocked.
*/
void
-ProcLockWakeup(LOCKMETHODTABLE *lockMethodTable, LOCK *lock)
+ProcLockWakeup(LockMethod lockMethodTable, LOCK *lock)
{
PROC_QUEUE *waitQueue = &(lock->waitProcs);
int queue_size = waitQueue->size;
diff -ruN ../base/src/include/storage/lmgr.h src/include/storage/lmgr.h
--- ../base/src/include/storage/lmgr.h 2003-08-04 04:40:14.000000000 +0200
+++ src/include/storage/lmgr.h 2003-09-06 18:02:43.000000000 +0200
@@ -40,10 +40,7 @@
* so increase that if you want to add more modes.
*/
-extern LOCKMETHOD LockTableId;
-
-
-extern LOCKMETHOD InitLockTable(int maxBackends);
+extern void InitLockTable(int maxBackends);
extern void RelationInitLockInfo(Relation relation);
/* Lock a relation */
diff -ruN ../base/src/include/storage/lock.h src/include/storage/lock.h
--- ../base/src/include/storage/lock.h 2003-08-04 04:40:14.000000000 +0200
+++ src/include/storage/lock.h 2003-09-06 22:45:16.000000000 +0200
@@ -42,22 +42,20 @@
typedef int LOCKMASK;
-
typedef int LOCKMODE;
-typedef int LOCKMETHOD;
-
/* MAX_LOCKMODES cannot be larger than the # of bits in LOCKMASK */
#define MAX_LOCKMODES 10
+typedef uint16 LOCKMETHODID;
/* MAX_LOCK_METHODS is the number of distinct lock control tables allowed */
#define MAX_LOCK_METHODS 3
-#define INVALID_TABLEID 0
-
-#define INVALID_LOCKMETHOD INVALID_TABLEID
+#define INVALID_LOCKMETHOD 0
#define DEFAULT_LOCKMETHOD 1
#define USER_LOCKMETHOD 2
+#define LockMethodIsValid(lockmethodid) ((lockmethodid) != INVALID_LOCKMETHOD)
+
/*
* There is normally only one lock method, the default one.
* If user locks are enabled, an additional lock method is present.
@@ -83,15 +81,16 @@
* masterLock -- synchronizes access to the table
*
*/
-typedef struct LOCKMETHODTABLE
+typedef struct LockMethodData
{
- HTAB *lockHash;
- HTAB *proclockHash;
- LOCKMETHOD lockmethod;
- int numLockModes;
- int conflictTab[MAX_LOCKMODES];
- LWLockId masterLock;
-} LOCKMETHODTABLE;
+ HTAB *lockHash;
+ HTAB *proclockHash;
+ LOCKMETHODID lockmethodid;
+ int numLockModes;
+ LOCKMASK conflictTab[MAX_LOCKMODES];
+ LWLockId masterLock;
+} LockMethodData;
+typedef LockMethodData *LockMethod;
/*
@@ -115,7 +114,7 @@
*/
OffsetNumber offnum;
- uint16 lockmethod; /* needed by userlocks */
+ LOCKMETHODID lockmethodid; /* needed by userlocks */
} LOCKTAG;
@@ -139,8 +138,8 @@
LOCKTAG tag; /* unique identifier of lockable
object */
/* data */
- int grantMask; /* bitmask for lock types
already granted */
- int waitMask; /* bitmask for lock types
awaited */
+ LOCKMASK grantMask; /* bitmask for lock types already
granted */
+ LOCKMASK waitMask; /* bitmask for lock types awaited */
SHM_QUEUE lockHolders; /* list of PROCLOCK objects assoc. with
* lock */
PROC_QUEUE waitProcs; /* list of PGPROC objects waiting on
lock */
@@ -151,7 +150,7 @@
int nGranted; /* total of granted[] array */
} LOCK;
-#define LOCK_LOCKMETHOD(lock) ((lock).tag.lockmethod)
+#define LOCK_LOCKMETHOD(lock) ((lock).tag.lockmethodid)
/*
@@ -204,7 +203,7 @@
} PROCLOCK;
#define PROCLOCK_LOCKMETHOD(proclock) \
- (((LOCK *) MAKE_PTR((proclock).tag.lock))->tag.lockmethod)
+ (((LOCK *) MAKE_PTR((proclock).tag.lock))->tag.lockmethodid)
/*
* This struct holds information passed from lmgr internals to the lock
@@ -227,17 +226,17 @@
* function prototypes
*/
extern void InitLocks(void);
-extern LOCKMETHODTABLE *GetLocksMethodTable(LOCK *lock);
-extern LOCKMETHOD LockMethodTableInit(char *tabName, LOCKMASK *conflictsP,
+extern LockMethod GetLocksMethodTable(LOCK *lock);
+extern LOCKMETHODID LockMethodTableInit(char *tabName, LOCKMASK *conflictsP,
int numModes, int maxBackends);
-extern LOCKMETHOD LockMethodTableRename(LOCKMETHOD lockmethod);
-extern bool LockAcquire(LOCKMETHOD lockmethod, LOCKTAG *locktag,
+extern LOCKMETHODID LockMethodTableRename(LOCKMETHODID lockmethodid);
+extern bool LockAcquire(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
TransactionId xid, LOCKMODE lockmode, bool dontWait);
-extern bool LockRelease(LOCKMETHOD lockmethod, LOCKTAG *locktag,
+extern bool LockRelease(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
TransactionId xid, LOCKMODE lockmode);
-extern bool LockReleaseAll(LOCKMETHOD lockmethod, PGPROC *proc,
+extern bool LockReleaseAll(LOCKMETHODID lockmethodid, PGPROC *proc,
bool allxids, TransactionId xid);
-extern int LockCheckConflicts(LOCKMETHODTABLE *lockMethodTable,
+extern int LockCheckConflicts(LockMethod lockMethodTable,
LOCKMODE lockmode,
LOCK *lock, PROCLOCK *proclock, PGPROC *proc,
int *myHolding);
diff -ruN ../base/src/include/storage/proc.h src/include/storage/proc.h
--- ../base/src/include/storage/proc.h 2003-08-04 04:40:15.000000000 +0200
+++ src/include/storage/proc.h 2003-09-06 22:45:54.000000000 +0200
@@ -101,10 +101,10 @@
extern void ProcReleaseLocks(bool isCommit);
extern void ProcQueueInit(PROC_QUEUE *queue);
-extern int ProcSleep(LOCKMETHODTABLE *lockMethodTable, LOCKMODE lockmode,
+extern int ProcSleep(LockMethod lockMethodTable, LOCKMODE lockmode,
LOCK *lock, PROCLOCK *proclock);
extern PGPROC *ProcWakeup(PGPROC *proc, int errType);
-extern void ProcLockWakeup(LOCKMETHODTABLE *lockMethodTable, LOCK *lock);
+extern void ProcLockWakeup(LockMethod lockMethodTable, LOCK *lock);
extern bool LockWaitCancel(void);
extern void ProcWaitForSignal(void);
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TIP 4: Don't 'kill -9' the postmaster
