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Revise backend libpq interfaces so that messages to the frontend

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can be generated in a buffer and then sent to the frontend in a single
libpq call.  This solves problems with NOTICE and ERROR messages generated
in the middle of a data message or COPY OUT operation.
This commit is contained in:
Tom Lane
1999-04-25 03:19:27 +00:00
parent fc08814e00
commit 95cc41b81d
18 changed files with 1071 additions and 1028 deletions
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87
src/backend/libpq/portal.c
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@@ -5,7 +5,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: portal.c,v 1.20 1999/02/13 23:15:45 momjian Exp $
* $Id: portal.c,v 1.21 1999/04/25 03:19:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -37,9 +37,6 @@
* PQgetvalue - Return an attribute (field) value
* PQgetlength - Return an attribute (field) length
* PQclear - free storage claimed by named portal
* PQnotifies - Return a list of relations on which notification
* has occurred.
* PQremoveNotify - Remove this notification from the list.
*
* NOTES
* These functions may be used by both frontend routines which
@@ -647,85 +644,3 @@ PQclear(char *pname)
return;
pbuf_close(pname);
}
/*
* async notification.
* This is going away with pending rewrite of comm. code...
*/
/* static SLList pqNotifyList;*/
static Dllist *pqNotifyList = NULL;
/* remove invalid notifies before returning */
void
PQcleanNotify()
{
Dlelem *e,
*next;
PQNotifyList *p;
e = DLGetHead(pqNotifyList);
while (e)
{
next = DLGetSucc(e);
p = (PQNotifyList *) DLE_VAL(e);
if (p->valid == 0)
{
DLRemove(e);
DLFreeElem(e);
pfree(p);
}
e = next;
}
}
void
PQnotifies_init()
{
Dlelem *e;
PQNotifyList *p;
if (pqNotifyList == NULL)
pqNotifyList = DLNewList();
else
{
/* clean all notifies */
for (e = DLGetHead(pqNotifyList); e != NULL; e = DLGetSucc(e))
{
p = (PQNotifyList *) DLE_VAL(e);
p->valid = 0;
}
PQcleanNotify();
}
}
PQNotifyList *
PQnotifies()
{
Dlelem *e;
PQcleanNotify();
e = DLGetHead(pqNotifyList);
return e ? (PQNotifyList *) DLE_VAL(e) : NULL;
}
void
PQremoveNotify(PQNotifyList *nPtr)
{
nPtr->valid = 0; /* remove later */
}
void
PQappendNotify(char *relname, int pid)
{
PQNotifyList *p;
if (pqNotifyList == NULL)
pqNotifyList = DLNewList();
p = (PQNotifyList *) pbuf_alloc(sizeof(PQNotifyList));
StrNCpy(p->relname, relname, NAMEDATALEN);
p->be_pid = pid;
p->valid = 1;
DLAddTail(pqNotifyList, DLNewElem(p));
}