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Tweak palloc/repalloc to allow zero bytes to be requested, as per recent

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proposal.  Eliminate several dozen now-unnecessary hacks to avoid palloc(0).
(It's likely there are more that I didn't find.)
This commit is contained in:
Tom Lane
2004-06-05 19:48:09 +00:00
parent 24a1e20f14
commit c3a153afed
19 changed files with 113 additions and 113 deletions
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4
src/backend/storage/freespace/freespace.c
View File

@@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/freespace/freespace.c,v 1.30 2004/01/26 22:35:32 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/freespace/freespace.c,v 1.31 2004/06/05 19:48:08 tgl Exp $
*
*
* NOTES:
@@ -893,7 +893,7 @@ LoadFreeSpaceMap(void)
len = nPages * sizeof(IndexFSMPageData);
else
len = nPages * sizeof(FSMPageData);
data = (char *) palloc(len + 1); /* +1 to avoid palloc(0) */
data = (char *) palloc(len);
if (fread(data, 1, len, fp) != len)
{
elog(LOG, "premature EOF in \"%s\"", cachefilename);

7
src/backend/storage/lmgr/deadlock.c
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@@ -12,7 +12,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/lmgr/deadlock.c,v 1.27 2003/12/01 21:59:25 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/lmgr/deadlock.c,v 1.28 2004/06/05 19:48:08 tgl Exp $
*
* Interface:
*
@@ -147,11 +147,10 @@ InitDeadLockChecking(void)
* We need to consider rearranging at most MaxBackends/2 wait queues
* (since it takes at least two waiters in a queue to create a soft
* edge), and the expanded form of the wait queues can't involve more
* than MaxBackends total waiters. (But avoid palloc(0) if
* MaxBackends = 1.)
* than MaxBackends total waiters.
*/
waitOrders = (WAIT_ORDER *)
palloc(((MaxBackends + 1) / 2) * sizeof(WAIT_ORDER));
palloc((MaxBackends / 2) * sizeof(WAIT_ORDER));
waitOrderProcs = (PGPROC **) palloc(MaxBackends * sizeof(PGPROC *));
/*

5
src/backend/storage/lmgr/lock.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lock.c,v 1.132 2004/05/28 05:13:05 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lock.c,v 1.133 2004/06/05 19:48:08 tgl Exp $
*
* NOTES
* Outside modules can create a lock table and acquire/release
@@ -1361,9 +1361,6 @@ GetLockStatusData(void)
data->nelements = i = proclockTable->hctl->nentries;
if (i == 0)
i = 1; /* avoid palloc(0) if empty table */
data->proclockaddrs = (SHMEM_OFFSET *) palloc(sizeof(SHMEM_OFFSET) * i);
data->proclocks = (PROCLOCK *) palloc(sizeof(PROCLOCK) * i);
data->procs = (PGPROC *) palloc(sizeof(PGPROC) * i);