First phase of memory management rewrite (see backend/utils/mmgr/README

for details).  It doesn't really do that much yet, since there are no
short-term memory contexts in the executor, but the infrastructure is
in place and long-term contexts are handled reasonably.  A few long-
standing bugs have been fixed, such as 'VACUUM; anything' in a single
query string crashing.  Also, out-of-memory is now considered a
recoverable ERROR, not FATAL.
Eliminate a large amount of crufty, now-dead code in and around
memory management.
Fix problem with holding off SIGTRAP, SIGSEGV, etc in postmaster and
backend startup.

src/include/miscadmin.h

@@ -12,7 +12,7 @@
  * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: miscadmin.h,v 1.60 2000/06/15 00:52:04 momjian Exp $
+ * $Id: miscadmin.h,v 1.61 2000/06/28 03:32:56 tgl Exp $
  *
  * NOTES
  *	  some of the information in this file will be moved to
@@ -105,8 +105,6 @@ extern bool enableFsync;
 extern bool allowSystemTableMods;
 extern int	SortMem;
 
-extern Oid	LastOidProcessed;	/* for query rewrite */
-
 /* a few postmaster startup options are exported here so the
    configuration file processor has access to them */
 
@@ -189,9 +187,10 @@ typedef int16 ExitStatus;
 
 /* in utils/init/postinit.c */
 
-extern bool PostgresIsInitialized;
+extern int	lockingOff;
 
 extern void InitPostgres(const char *dbname);
+extern void BaseInit(void);
 
 /* one of the ways to get out of here */
 #define ExitPostgres(status) proc_exec(status)