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

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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.
This commit is contained in:
Tom Lane
2005-08-20 23:26:37 +00:00
parent 2299ceab1c
commit 0007490e09
50 changed files with 774 additions and 275 deletions
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6
src/backend/storage/ipc/pmsignal.c
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/ipc/pmsignal.c,v 1.18 2004/12/31 22:00:56 pgsql Exp $
* $PostgreSQL: pgsql/src/backend/storage/ipc/pmsignal.c,v 1.19 2005/08/20 23:26:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -48,7 +48,9 @@ PMSignalInit(void)
bool found;
PMSignalFlags = (sig_atomic_t *)
ShmemInitStruct("PMSignalFlags", NUM_PMSIGNALS * sizeof(sig_atomic_t), &found);
ShmemInitStruct("PMSignalFlags",
NUM_PMSIGNALS * sizeof(sig_atomic_t),
&found);
if (!found)
MemSet(PMSignalFlags, 0, NUM_PMSIGNALS * sizeof(sig_atomic_t));