Convert the arithmetic for shared memory size calculation from 'int'

to 'Size' (that is, size_t), and install overflow detection checks in it.
This allows us to remove the former arbitrary restrictions on NBuffers
etc.  It won't make any difference in a 32-bit machine, but in a 64-bit
machine you could theoretically have terabytes of shared buffers.
(How efficiently we could manage 'em remains to be seen.)  Similarly,
num_temp_buffers, work_mem, and maintenance_work_mem can be set above
2Gb on a 64-bit machine.  Original patch from Koichi Suzuki, additional
work by moi.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/include/storage/bufmgr.h b/src/include/storage/bufmgr.h
index a88565e1596..63def4a2e29 100644
--- a/src/include/storage/bufmgr.h
+++ b/src/include/storage/bufmgr.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.95 2005/08/12 05:05:51 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.96 2005/08/20 23:26:33 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -140,7 +140,7 @@ extern void DropBuffers(Oid dbid);
 #ifdef NOT_USED
 extern void PrintPinnedBufs(void);
 #endif
-extern int	BufferShmemSize(void);
+extern Size BufferShmemSize(void);
 extern RelFileNode BufferGetFileNode(Buffer buffer);
 
 extern void SetBufferCommitInfoNeedsSave(Buffer buffer);