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Redesign the patch for allocation of shmem space and LWLocks for add-on

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modules; the first try was not usable in EXEC_BACKEND builds (e.g.,
Windows).  Instead, just provide some entry points to increase the
allocation requests during postmaster start, and provide a dedicated
LWLock that can be used to synchronize allocation operations performed
by backends.  Per discussion with Marc Munro.
This commit is contained in:
Tom Lane
2006-10-15 22:04:08 +00:00
parent a3dff39c53
commit e0dece127d
6 changed files with 73 additions and 259 deletions
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10
src/include/storage/shmem.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/shmem.h,v 1.48 2006/08/01 19:03:11 momjian Exp $
* $PostgreSQL: pgsql/src/include/storage/shmem.h,v 1.49 2006/10/15 22:04:08 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -38,11 +38,6 @@ typedef unsigned long SHMEM_OFFSET;
extern DLLIMPORT SHMEM_OFFSET ShmemBase;
/* coerce an offset into a pointer in a specified address space. This
* macro (only) is not confined to the primary shared memory region */
#define MAKE_PTRFROM(base,xx_offs)\
(base+((unsigned long)(xx_offs)))
/* coerce an offset into a pointer in this process's address space */
#define MAKE_PTR(xx_offs)\
(ShmemBase+((unsigned long)(xx_offs)))
@@ -77,6 +72,9 @@ extern void *ShmemInitStruct(const char *name, Size size, bool *foundPtr);
extern Size add_size(Size s1, Size s2);
extern Size mul_size(Size s1, Size s2);
/* ipci.c */
extern void RequestAddinShmemSpace(Size size);
/* size constants for the shmem index table */
/* max size of data structure string name */
#define SHMEM_INDEX_KEYSIZE (48)