Remove dllist.c from libpq. It's overkill for what libpq needs; we can

just stick a list-link into struct PGnotify instead.  Result is a smaller
faster and more robust library (mainly because we reduce the number of
malloc's and free's involved in notify processing), plus less pollution
of application link-symbol namespace.

src/include/Makefile

@@ -4,7 +4,7 @@
 #
 # 'make install' installs whole contents of src/include.
 #
-# $PostgreSQL: pgsql/src/include/Makefile,v 1.14 2004/10/07 16:23:28 momjian Exp $
+# $PostgreSQL: pgsql/src/include/Makefile,v 1.15 2004/10/16 22:52:39 tgl Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -33,7 +33,6 @@ install: all installdirs remove-old-headers
 	$(INSTALL_DATA) $(srcdir)/port.h         $(DESTDIR)$(includedir_internal)
 	$(INSTALL_DATA) $(srcdir)/postgres_fe.h  $(DESTDIR)$(includedir_internal)
 	$(INSTALL_DATA) $(srcdir)/libpq/pqcomm.h $(DESTDIR)$(includedir_internal)/libpq
-	$(INSTALL_DATA) $(srcdir)/lib/dllist.h   $(DESTDIR)$(includedir_internal)/lib
 # These headers are needed for server-side development
 	$(INSTALL_DATA) pg_config.h    $(DESTDIR)$(includedir_server)
 	$(INSTALL_DATA) pg_config_os.h $(DESTDIR)$(includedir_server)
@@ -71,7 +70,7 @@ remove-old-headers:
 
 uninstall:
 	rm -f $(addprefix $(DESTDIR)$(includedir)/, pg_config.h pg_config_os.h postgres_ext.h libpq/libpq-fs.h)
-	rm -f $(addprefix $(DESTDIR)$(includedir_internal)/, c.h postgres_fe.h lib/dllist.h libpq/pqcomm.h)
+	rm -f $(addprefix $(DESTDIR)$(includedir_internal)/, c.h postgres_fe.h libpq/pqcomm.h)
 # heuristic...
 	rm -rf $(addprefix $(DESTDIR)$(includedir_server)/, $(SUBDIRS) *.h)
 

src/interfaces/libpq/Makefile

@@ -5,7 +5,7 @@
 # Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
 # Portions Copyright (c) 1994, Regents of the University of California
 #
-# $PostgreSQL: pgsql/src/interfaces/libpq/Makefile,v 1.119 2004/10/16 20:10:56 tgl Exp $
+# $PostgreSQL: pgsql/src/interfaces/libpq/Makefile,v 1.120 2004/10/16 22:52:49 tgl Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -28,7 +28,7 @@ LIBS := $(patsubst -lpgport,, $(LIBS))
 
 OBJS=	fe-auth.o fe-connect.o fe-exec.o fe-misc.o fe-print.o fe-lobj.o \
 	fe-protocol2.o fe-protocol3.o pqexpbuffer.o pqsignal.o fe-secure.o \
-	dllist.o md5.o ip.o wchar.o encnames.o noblock.o pgstrcasecmp.o thread.o \
+	md5.o ip.o wchar.o encnames.o noblock.o pgstrcasecmp.o thread.o \
 	$(filter crypt.o getaddrinfo.o inet_aton.o open.o snprintf.o strerror.o, $(LIBOBJS))
 
 ifeq ($(PORTNAME), win32)
@@ -73,9 +73,6 @@ crypt.c getaddrinfo.c inet_aton.c noblock.c pgstrcasecmp.c snprintf.c strerror.c
 md5.c ip.c: % : $(backend_src)/libpq/%
 	rm -f $@ && $(LN_S) $< .
 
-dllist.c: $(backend_src)/lib/dllist.c
-	rm -f $@ && $(LN_S) $< .
-
 encnames.c wchar.c : % : $(backend_src)/utils/mb/%
 	rm -f $@ && $(LN_S) $< .
 
@@ -137,7 +134,7 @@ uninstall: uninstall-lib
 	rm -f $(DESTDIR)$(includedir)/libpq-fe.h $(DESTDIR)$(includedir_internal)/libpq-int.h $(DESTDIR)$(includedir_internal)/pqexpbuffer.h
 
 clean distclean: clean-lib
-	rm -f $(OBJS) crypt.c getaddrinfo.c inet_aton.c noblock.c pgstrcasecmp.c snprintf.c strerror.c open.c thread.c dllist.c md5.c ip.c encnames.c wchar.c pthread.h
+	rm -f $(OBJS) crypt.c getaddrinfo.c inet_aton.c noblock.c pgstrcasecmp.c snprintf.c strerror.c open.c thread.c md5.c ip.c encnames.c wchar.c pthread.h
 
 maintainer-clean: distclean
 	rm -f $(srcdir)/libpqdll.def $(srcdir)/libpqddll.def $(srcdir)/blibpqdll.def

src/interfaces/libpq/bcc32.mak

@@ -69,7 +69,6 @@ LIB32_OBJS= \
 	"$(INTDIR)\crypt.obj" \
 	"$(INTDIR)\noblock.obj" \
 	"$(INTDIR)\pgstrcasecmp.obj" \
-	"$(INTDIR)\dllist.obj" \
 	"$(INTDIR)\md5.obj" \
 	"$(INTDIR)\ip.obj" \
 	"$(INTDIR)\fe-auth.obj" \
@@ -100,7 +99,6 @@ CLEAN :
 	-@erase "$(INTDIR)\thread.obj"
 	-@erase "$(INTDIR)\inet_aton.obj"
 	-@erase "$(INTDIR)\crypt.obj"
-	-@erase "$(INTDIR)\dllist.obj"
 	-@erase "$(INTDIR)\md5.obj"
 	-@erase "$(INTDIR)\ip.obj"
 	-@erase "$(INTDIR)\fe-auth.obj"

src/interfaces/libpq/fe-connect.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/interfaces/libpq/fe-connect.c,v 1.284 2004/08/29 05:07:00 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/interfaces/libpq/fe-connect.c,v 1.285 2004/10/16 22:52:49 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1967,7 +1967,6 @@ makeEmptyPGconn(void)
 	conn->setenv_state = SETENV_STATE_IDLE;
 	conn->client_encoding = PG_SQL_ASCII;
 	conn->verbosity = PQERRORS_DEFAULT;
-	conn->notifyList = DLNewList();
 	conn->sock = -1;
 #ifdef USE_SSL
 	conn->allow_ssl_try = true;
@@ -2013,6 +2012,7 @@ makeEmptyPGconn(void)
 static void
 freePGconn(PGconn *conn)
 {
+	PGnotify   *notify;
 	pgParameterStatus *pstatus;
 
 	if (!conn)
@@ -2047,8 +2047,14 @@ freePGconn(PGconn *conn)
 	if (conn->sslmode)
 		free(conn->sslmode);
 	/* Note that conn->Pfdebug is not ours to close or free */
-	if (conn->notifyList)
-		DLFreeList(conn->notifyList);
+	notify = conn->notifyHead;
+	while (notify != NULL)
+	{
+		PGnotify *prev = notify;
+
+		notify = notify->next;
+		free(prev);
+	}
 	freeaddrinfo_all(conn->addrlist_family, conn->addrlist);
 	pstatus = conn->pstatus;
 	while (pstatus != NULL)

src/interfaces/libpq/fe-exec.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/interfaces/libpq/fe-exec.c,v 1.162 2004/08/30 02:54:41 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/interfaces/libpq/fe-exec.c,v 1.163 2004/10/16 22:52:53 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1323,7 +1323,6 @@ PQexecFinish(PGconn *conn)
 PGnotify *
 PQnotifies(PGconn *conn)
 {
-	Dlelem	   *e;
 	PGnotify   *event;
 
 	if (!conn)
@@ -1332,12 +1331,14 @@ PQnotifies(PGconn *conn)
 	/* Parse any available data to see if we can extract NOTIFY messages. */
 	parseInput(conn);
 
-	/* RemHead returns NULL if list is empty */
-	e = DLRemHead(conn->notifyList);
-	if (!e)
-		return NULL;
-	event = (PGnotify *) DLE_VAL(e);
-	DLFreeElem(e);
+	event = conn->notifyHead;
+	if (event)
+	{
+		conn->notifyHead = event->next;
+		if (!conn->notifyHead)
+			conn->notifyTail = NULL;
+		event->next = NULL;		/* don't let app see the internal state */
+	}
 	return event;
 }
 

src/interfaces/libpq/fe-protocol2.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/interfaces/libpq/fe-protocol2.c,v 1.14 2004/08/30 02:54:41 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/interfaces/libpq/fe-protocol2.c,v 1.15 2004/10/16 22:52:54 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -937,7 +937,12 @@ getNotify(PGconn *conn)
 		/* fake up an empty-string extra field */
 		newNotify->extra = newNotify->relname + nmlen;
 		newNotify->be_pid = be_pid;
-		DLAddTail(conn->notifyList, DLNewElem(newNotify));
+		newNotify->next = NULL;
+		if (conn->notifyTail)
+			conn->notifyTail->next = newNotify;
+		else
+			conn->notifyHead = newNotify;
+		conn->notifyTail = newNotify;
 	}
 
 	return 0;

src/interfaces/libpq/fe-protocol3.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/interfaces/libpq/fe-protocol3.c,v 1.17 2004/10/12 21:54:45 petere Exp $
+ *	  $PostgreSQL: pgsql/src/interfaces/libpq/fe-protocol3.c,v 1.18 2004/10/16 22:52:54 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -791,7 +791,12 @@ getNotify(PGconn *conn)
 		newNotify->extra = newNotify->relname + nmlen + 1;
 		strcpy(newNotify->extra, conn->workBuffer.data);
 		newNotify->be_pid = be_pid;
-		DLAddTail(conn->notifyList, DLNewElem(newNotify));
+		newNotify->next = NULL;
+		if (conn->notifyTail)
+			conn->notifyTail->next = newNotify;
+		else
+			conn->notifyHead = newNotify;
+		conn->notifyTail = newNotify;
 	}
 
 	free(svname);

src/interfaces/libpq/libpq-fe.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/interfaces/libpq/libpq-fe.h,v 1.110 2004/10/16 03:26:43 momjian Exp $
+ * $PostgreSQL: pgsql/src/interfaces/libpq/libpq-fe.h,v 1.111 2004/10/16 22:52:55 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -127,6 +127,8 @@ typedef struct pgNotify
 	char	   *relname;		/* notification condition name */
 	int			be_pid;			/* process ID of server process */
 	char	   *extra;			/* notification parameter */
+	/* Fields below here are private to libpq; apps should not use 'em */
+	struct pgNotify *next;		/* list link */
 } PGnotify;
 
 /* Function types for notice-handling callbacks */

src/interfaces/libpq/libpq-int.h

@@ -12,7 +12,7 @@
  * Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/interfaces/libpq/libpq-int.h,v 1.93 2004/10/05 15:09:41 momjian Exp $
+ * $PostgreSQL: pgsql/src/interfaces/libpq/libpq-int.h,v 1.94 2004/10/16 22:52:55 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -41,7 +41,6 @@ typedef int ssize_t;			/* ssize_t doesn't exist in VC (at least
 /* include stuff common to fe and be */
 #include "getaddrinfo.h"
 #include "libpq/pqcomm.h"
-#include "lib/dllist.h"
 /* include stuff found in fe only */
 #include "pqexpbuffer.h"
 
@@ -272,8 +271,8 @@ struct pg_conn
 	char		copy_is_binary; /* 1 = copy binary, 0 = copy text */
 	int			copy_already_done;		/* # bytes already returned in
 										 * COPY OUT */
-	Dllist	   *notifyList;		/* Notify msgs not yet handed to
-								 * application */
+	PGnotify   *notifyHead;		/* oldest unreported Notify msg */
+	PGnotify   *notifyTail;		/* newest unreported Notify msg */
 
 	/* Connection data */
 	int			sock;			/* Unix FD for socket, -1 if not connected */

src/interfaces/libpq/win32.mak

@@ -50,7 +50,6 @@ CLEAN :
 	-@erase "$(INTDIR)\inet_aton.obj"
 	-@erase "$(INTDIR)\crypt.obj"
 	-@erase "$(INTDIR)\noblock.obj"
-	-@erase "$(INTDIR)\dllist.obj"
 	-@erase "$(INTDIR)\md5.obj"
 	-@erase "$(INTDIR)\ip.obj"
 	-@erase "$(INTDIR)\fe-auth.obj"
@@ -117,7 +116,6 @@ LIB32_OBJS= \
 	"$(INTDIR)\inet_aton.obj" \
         "$(INTDIR)\crypt.obj" \
 	"$(INTDIR)\noblock.obj" \
-	"$(INTDIR)\dllist.obj" \
 	"$(INTDIR)\md5.obj" \
 	"$(INTDIR)\ip.obj" \
 	"$(INTDIR)\fe-auth.obj" \
@@ -192,12 +190,6 @@ LINK32_OBJS= \
     $(CPP_PROJ) ..\..\port\noblock.c
 <<
 
-"$(INTDIR)\dllist.obj" : ..\..\backend\lib\dllist.c
-    $(CPP) @<<
-    $(CPP_PROJ) ..\..\backend\lib\dllist.c
-<<
-
-
 "$(INTDIR)\md5.obj" : ..\..\backend\libpq\md5.c
     $(CPP) @<<
     $(CPP_PROJ) ..\..\backend\libpq\md5.c