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Add the experimental mem5.c memory allocator. Allocate the content part

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of cache pages separately from the header.  (See check-ins (4495) and (4409)). (CVS 4789)

FossilOrigin-Name: 669ece8c82bfa69add852589dd1211751cb26fb2
This commit is contained in:
drh
2008-02-14 23:26:56 +00:00
parent 7663e36c40
commit 0d18020b80
10 changed files with 737 additions and 82 deletions
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28
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.661 2008/02/13 18:25:27 danielk1977 Exp $
** @(#) $Id: sqliteInt.h,v 1.662 2008/02/14 23:26:56 drh Exp $
*/
#ifndef _SQLITEINT_H_
#define _SQLITEINT_H_
@@ -117,6 +117,32 @@
#endif
#endif
/*
** Exactly one of the following macros must be defined in order to
** specify which memory allocation subsystem to use.
**
** SQLITE_SYSTEM_MALLOC // Use normal system malloc()
** SQLITE_MEMDEBUG // Debugging version of system malloc()
** SQLITE_MEMORY_SIZE // internal allocator #1
** SQLITE_MMAP_HEAP_SIZE // internal mmap() allocator
** SQLITE_POW2_MEMORY_SIZE // internal power-of-two allocator
**
** If none of the above are defined, then set SQLITE_SYSTEM_MALLOC as
** the default.
*/
#if defined(SQLITE_SYSTEM_MALLOC)+defined(SQLITE_MEMDEBUG)+\
defined(SQLITE_MEMORY_SIZE)+defined(SQLITE_MMAP_HEAP_SIZE)+\
defined(SQLITE_POW2_MEMORY_SIZE)>1
# error "At most one of the following compile-time configuration options\
is allows: SQLITE_SYSTEM_MALLOC, SQLITE_MEMDEBUG, SQLITE_MEMORY_SIZE,\
SQLITE_MMAP_HEAP_SIZE, SQLITE_POW2_MEMORY_SIZE"
#endif
#if defined(SQLITE_SYSTEM_MALLOC)+defined(SQLITE_MEMDEBUG)+\
defined(SQLITE_MEMORY_SIZE)+defined(SQLITE_MMAP_HEAP_SIZE)+\
defined(SQLITE_POW2_MEMORY_SIZE)==0
# define SQLITE_SYSTEM_MALLOC 1
#endif
/*
** We need to define _XOPEN_SOURCE as follows in order to enable
** recursive mutexes on most unix systems. But Mac OS X is different.