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Initial MVCC code.

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New code for locking buffer' context.
This commit is contained in:
Vadim B. Mikheev
1998-12-15 12:47:01 +00:00
parent c5a27161a1
commit 3f7fbf85dc
65 changed files with 1391 additions and 1282 deletions
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20
src/backend/commands/user.c
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@ -5,7 +5,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: user.c,v 1.22 1998/12/14 08:11:00 scrappy Exp $
* $Id: user.c,v 1.23 1998/12/15 12:46:00 vadim Exp $
*
*-------------------------------------------------------------------------
*/
@ -136,7 +136,7 @@ DefineUser(CreateUserStmt *stmt)
* Secure a write lock on pg_shadow so we can be sure of what the next
* usesysid should be.
*/
RelationSetLockForWrite(pg_shadow_rel);
LockRelation(pg_shadow_rel, AccessExclusiveLock);
scan = heap_beginscan(pg_shadow_rel, false, SnapshotNow, 0, NULL);
while (HeapTupleIsValid(tuple = heap_getnext(scan, 0)))
@ -154,7 +154,7 @@ DefineUser(CreateUserStmt *stmt)
if (exists)
{
RelationUnsetLockForWrite(pg_shadow_rel);
UnlockRelation(pg_shadow_rel, AccessExclusiveLock);
heap_close(pg_shadow_rel);
UserAbortTransactionBlock();
elog(ERROR,
@ -187,7 +187,7 @@ DefineUser(CreateUserStmt *stmt)
* This goes after the UpdatePgPwdFile to be certain that two backends
* to not attempt to write to the pg_pwd file at the same time.
*/
RelationUnsetLockForWrite(pg_shadow_rel);
UnlockRelation(pg_shadow_rel, AccessExclusiveLock);
heap_close(pg_shadow_rel);
if (IsTransactionBlock() && !inblock)
@ -235,14 +235,14 @@ AlterUser(AlterUserStmt *stmt)
* dump of the pg_pwd file is done, there is not another backend doing
* the same.
*/
RelationSetLockForWrite(pg_shadow_rel);
LockRelation(pg_shadow_rel, AccessExclusiveLock);
tuple = SearchSysCacheTuple(USENAME,
PointerGetDatum(stmt->user),
0, 0, 0);
if (!HeapTupleIsValid(tuple))
{
RelationUnsetLockForWrite(pg_shadow_rel);
UnlockRelation(pg_shadow_rel, AccessExclusiveLock);
heap_close(pg_shadow_rel);
UserAbortTransactionBlock(); /* needed? */
elog(ERROR, "alterUser: user \"%s\" does not exist", stmt->user);
@ -288,7 +288,7 @@ AlterUser(AlterUserStmt *stmt)
UpdatePgPwdFile(sql);
RelationUnsetLockForWrite(pg_shadow_rel);
UnlockRelation(pg_shadow_rel, AccessExclusiveLock);
heap_close(pg_shadow_rel);
if (IsTransactionBlock() && !inblock)
@ -342,14 +342,14 @@ RemoveUser(char *user)
* dump of the pg_pwd file is done, there is not another backend doing
* the same.
*/
RelationSetLockForWrite(pg_shadow_rel);
LockRelation(pg_shadow_rel, AccessExclusiveLock);
tuple = SearchSysCacheTuple(USENAME,
PointerGetDatum(user),
0, 0, 0);
if (!HeapTupleIsValid(tuple))
{
RelationUnsetLockForWrite(pg_shadow_rel);
UnlockRelation(pg_shadow_rel, AccessExclusiveLock);
heap_close(pg_shadow_rel);
UserAbortTransactionBlock();
elog(ERROR, "removeUser: user \"%s\" does not exist", user);
@ -422,7 +422,7 @@ RemoveUser(char *user)
UpdatePgPwdFile(sql);
RelationUnsetLockForWrite(pg_shadow_rel);
UnlockRelation(pg_shadow_rel, AccessExclusiveLock);
heap_close(pg_shadow_rel);
if (IsTransactionBlock() && !inblock)