-# $PostgreSQL: pgsql/contrib/Makefile,v 1.76 2007/05/17 19:11:24 momjian Exp $
+# $PostgreSQL: pgsql/contrib/Makefile,v 1.77 2007/06/01 19:38:07 tgl Exp $
subdir = contrib
top_builddir = ..
$(MAKE) -C $$dir $@ || exit; \
done
-# We'd like check operations to run all the subtests before failing;
-# also insert a sleep to ensure the previous test backend exited before
-# we try to drop the regression database.
+# We'd like check operations to run all the subtests before failing.
check installcheck:
@CHECKERR=0; for dir in $(WANTED_DIRS); do \
- sleep 1; \
$(MAKE) -C $$dir $@ || CHECKERR=$$?; \
done; \
exit $$CHECKERR
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/commands/dbcommands.c,v 1.194 2007/04/12 15:04:35 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/commands/dbcommands.c,v 1.195 2007/06/01 19:38:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
dbtemplate)));
}
- /*
- * The source DB can't have any active backends, except this one
- * (exception is to allow CREATE DB while connected to template1).
- * Otherwise we might copy inconsistent data.
- */
- if (DatabaseCancelAutovacuumActivity(src_dboid, true))
- ereport(ERROR,
- (errcode(ERRCODE_OBJECT_IN_USE),
- errmsg("source database \"%s\" is being accessed by other users",
- dbtemplate)));
-
/* If encoding is defaulted, use source's encoding */
if (encoding < 0)
encoding = src_encoding;
(errcode(ERRCODE_DUPLICATE_DATABASE),
errmsg("database \"%s\" already exists", dbname)));
+ /*
+ * The source DB can't have any active backends, except this one
+ * (exception is to allow CREATE DB while connected to template1).
+ * Otherwise we might copy inconsistent data.
+ *
+ * This should be last among the basic error checks, because it involves
+ * potential waiting; we may as well throw an error first if we're gonna
+ * throw one.
+ */
+ if (CheckOtherDBBackends(src_dboid))
+ ereport(ERROR,
+ (errcode(ERRCODE_OBJECT_IN_USE),
+ errmsg("source database \"%s\" is being accessed by other users",
+ dbtemplate)));
+
/*
* Select an OID for the new database, checking that it doesn't have
* a filename conflict with anything already existing in the tablespace
Relation pgdbrel;
HeapTuple tup;
- AssertArg(dbname);
-
- if (strcmp(dbname, get_database_name(MyDatabaseId)) == 0)
- ereport(ERROR,
- (errcode(ERRCODE_OBJECT_IN_USE),
- errmsg("cannot drop the currently open database")));
-
/*
* Look up the target database's OID, and get exclusive lock on it. We
* need this to ensure that no new backend starts up in the target
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot drop a template database")));
+ /* Obviously can't drop my own database */
+ if (db_id == MyDatabaseId)
+ ereport(ERROR,
+ (errcode(ERRCODE_OBJECT_IN_USE),
+ errmsg("cannot drop the currently open database")));
+
/*
- * Check for active backends in the target database. (Because we hold the
+ * Check for other backends in the target database. (Because we hold the
* database lock, no new ones can start after this.)
+ *
+ * As in CREATE DATABASE, check this after other error conditions.
*/
- if (DatabaseCancelAutovacuumActivity(db_id, false))
+ if (CheckOtherDBBackends(db_id))
ereport(ERROR,
(errcode(ERRCODE_OBJECT_IN_USE),
errmsg("database \"%s\" is being accessed by other users",
(errcode(ERRCODE_UNDEFINED_DATABASE),
errmsg("database \"%s\" does not exist", oldname)));
+ /* must be owner */
+ if (!pg_database_ownercheck(db_id, GetUserId()))
+ aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_DATABASE,
+ oldname);
+
+ /* must have createdb rights */
+ if (!have_createdb_privilege())
+ ereport(ERROR,
+ (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
+ errmsg("permission denied to rename database")));
+
+ /*
+ * Make sure the new name doesn't exist. See notes for same error in
+ * CREATE DATABASE.
+ */
+ if (OidIsValid(get_database_oid(newname)))
+ ereport(ERROR,
+ (errcode(ERRCODE_DUPLICATE_DATABASE),
+ errmsg("database \"%s\" already exists", newname)));
+
/*
* XXX Client applications probably store the current database somewhere,
* so renaming it could cause confusion. On the other hand, there may not
/*
* Make sure the database does not have active sessions. This is the same
* concern as above, but applied to other sessions.
+ *
+ * As in CREATE DATABASE, check this after other error conditions.
*/
- if (DatabaseCancelAutovacuumActivity(db_id, false))
+ if (CheckOtherDBBackends(db_id))
ereport(ERROR,
(errcode(ERRCODE_OBJECT_IN_USE),
errmsg("database \"%s\" is being accessed by other users",
oldname)));
- /* make sure the new name doesn't exist */
- if (OidIsValid(get_database_oid(newname)))
- ereport(ERROR,
- (errcode(ERRCODE_DUPLICATE_DATABASE),
- errmsg("database \"%s\" already exists", newname)));
-
- /* must be owner */
- if (!pg_database_ownercheck(db_id, GetUserId()))
- aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_DATABASE,
- oldname);
-
- /* must have createdb rights */
- if (!have_createdb_privilege())
- ereport(ERROR,
- (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
- errmsg("permission denied to rename database")));
-
/* rename */
newtup = SearchSysCacheCopy(DATABASEOID,
ObjectIdGetDatum(db_id),
*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/storage/ipc/procarray.c,v 1.24 2007/04/03 16:34:36 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/storage/ipc/procarray.c,v 1.25 2007/06/01 19:38:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
return snapshot;
}
-/*
- * DatabaseCancelAutovacuumActivity -- are there any backends running in the
- * given DB, apart from autovacuum? If an autovacuum process is running on the
- * database, kill it and restart the counting.
- *
- * If 'ignoreMyself' is TRUE, ignore this particular backend while checking
- * for backends in the target database.
- *
- * This function is used to interlock DROP DATABASE against there being
- * any active backends in the target DB --- dropping the DB while active
- * backends remain would be a Bad Thing. Note that we cannot detect here
- * the possibility of a newly-started backend that is trying to connect
- * to the doomed database, so additional interlocking is needed during
- * backend startup.
- */
-bool
-DatabaseCancelAutovacuumActivity(Oid databaseId, bool ignoreMyself)
-{
- ProcArrayStruct *arrayP = procArray;
- int index;
- int num;
-
-restart:
- num = 0;
-
- CHECK_FOR_INTERRUPTS();
-
- LWLockAcquire(ProcArrayLock, LW_SHARED);
-
- for (index = 0; index < arrayP->numProcs; index++)
- {
- PGPROC *proc = arrayP->procs[index];
-
- if (proc->databaseId == databaseId)
- {
- if (ignoreMyself && proc == MyProc)
- continue;
-
- num++;
-
- if (proc->isAutovacuum)
- {
- /* an autovacuum -- kill it and restart */
- LWLockRelease(ProcArrayLock);
- kill(proc->pid, SIGINT);
- pg_usleep(100 * 1000); /* 100ms */
- goto restart;
- }
- }
- }
-
- LWLockRelease(ProcArrayLock);
-
- return (num != 0);
-}
-
/*
* GetTransactionsInCommit -- Get the XIDs of transactions that are committing
*
return count;
}
+/*
+ * CheckOtherDBBackends -- check for other backends running in the given DB
+ *
+ * If there are other backends in the DB, we will wait a maximum of 5 seconds
+ * for them to exit. Autovacuum backends are encouraged to exit early by
+ * sending them SIGINT, but normal user backends are just waited for.
+ *
+ * The current backend is always ignored; it is caller's responsibility to
+ * check whether the current backend uses the given DB, if it's important.
+ *
+ * Returns TRUE if there are (still) other backends in the DB, FALSE if not.
+ *
+ * This function is used to interlock DROP DATABASE and related commands
+ * against there being any active backends in the target DB --- dropping the
+ * DB while active backends remain would be a Bad Thing. Note that we cannot
+ * detect here the possibility of a newly-started backend that is trying to
+ * connect to the doomed database, so additional interlocking is needed during
+ * backend startup. The caller should normally hold an exclusive lock on the
+ * target DB before calling this, which is one reason we mustn't wait
+ * indefinitely.
+ */
+bool
+CheckOtherDBBackends(Oid databaseId)
+{
+ ProcArrayStruct *arrayP = procArray;
+ int tries;
+
+ /* 50 tries with 100ms sleep between tries makes 5 sec total wait */
+ for (tries = 0; tries < 50; tries++)
+ {
+ bool found = false;
+ int index;
+
+ CHECK_FOR_INTERRUPTS();
+
+ LWLockAcquire(ProcArrayLock, LW_SHARED);
+
+ for (index = 0; index < arrayP->numProcs; index++)
+ {
+ PGPROC *proc = arrayP->procs[index];
+
+ if (proc->databaseId != databaseId)
+ continue;
+ if (proc == MyProc)
+ continue;
+
+ found = true;
+
+ if (proc->isAutovacuum)
+ {
+ /* an autovacuum --- send it SIGINT before sleeping */
+ int autopid = proc->pid;
+
+ /*
+ * It's a bit awkward to release ProcArrayLock within the loop,
+ * but we'd probably better do so before issuing kill(). We
+ * have no idea what might block kill() inside the kernel...
+ */
+ LWLockRelease(ProcArrayLock);
+
+ (void) kill(autopid, SIGINT); /* ignore any error */
+
+ break;
+ }
+ else
+ {
+ LWLockRelease(ProcArrayLock);
+ break;
+ }
+ }
+
+ /* if found is set, we released the lock within the loop body */
+ if (!found)
+ {
+ LWLockRelease(ProcArrayLock);
+ return false; /* no conflicting backends, so done */
+ }
+
+ /* else sleep and try again */
+ pg_usleep(100 * 1000L); /* 100ms */
+ }
+
+ return true; /* timed out, still conflicts */
+}
+
#define XidCacheRemove(i) \
do { \
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $PostgreSQL: pgsql/src/include/storage/procarray.h,v 1.13 2007/04/03 16:34:36 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/storage/procarray.h,v 1.14 2007/06/01 19:38:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
extern PGPROC *BackendPidGetProc(int pid);
extern int BackendXidGetPid(TransactionId xid);
extern bool IsBackendPid(int pid);
-extern bool DatabaseCancelAutovacuumActivity(Oid databaseId, bool ignoreMyself);
extern int CountActiveBackends(void);
extern int CountDBBackends(Oid databaseid);
extern int CountUserBackends(Oid roleid);
+extern bool CheckOtherDBBackends(Oid databaseId);
extern void XidCacheRemoveRunningXids(TransactionId xid,
int nxids, TransactionId *xids);
#
# Copyright (c) 1994, Regents of the University of California
#
-# $PostgreSQL: pgsql/src/pl/Makefile,v 1.25 2007/02/09 15:55:59 petere Exp $
+# $PostgreSQL: pgsql/src/pl/Makefile,v 1.26 2007/06/01 19:38:07 tgl Exp $
#
#-------------------------------------------------------------------------
clean distclean maintainer-clean:
@for dir in $(DIRS); do $(MAKE) -C $$dir $@; done
-# We'd like check operations to run all the subtests before failing;
-# also insert a sleep to ensure the previous test backend exited before
-# we try to drop the regression database.
+# We'd like check operations to run all the subtests before failing.
check installcheck:
@CHECKERR=0; for dir in $(DIRS); do \
- sleep 1; \
$(MAKE) -C $$dir $@ || CHECKERR=$$?; \
done; \
exit $$CHECKERR
projects / postgresql / commitdiff