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Refactoring the mmap interface. The controlling pragma is now "mmap_size"

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instead of "mmap_limit".  Also change SQLITE_CONFIG_MMAP_LIMIT and
SQLITE_FCNTL_MMAP_LIMIT to SQLITE_CONFIG_MMAP_SIZE and
SQLITE_FCNTL_MMAP_SIZE, respecctively.  
The default mmap_size is now always 0, meaning that
memory mapped I/O is off by default.  There is a new compile-time option
SQLITE_MAX_MMAP_SIZE that determines a hard upper bound on the mmap_size.
Setting SQLITE_MAX_MMAP_SIZE to zero disables the memory-mapped I/O logic
and causes it to be omitted from the build.  An extra argument is added
to SQLITE_CONFIG_MMAP_SIZE that can optionally lower the SQLITE_MAX_MMAP_SIZE
at start-time. The SQLITE_MAX_MMAP_SIZE is zero for platforms where we 
know that it does not work, meaning that it cannot be turned on by mistake
on those platforms.

FossilOrigin-Name: ea1404a10abd7f68e1f8e0708c8a3199d1f79665
This commit is contained in:
drh
2013-04-15 17:03:42 +00:00
parent a1710cc2ea
commit 9b4c59fa1b
31 changed files with 245 additions and 213 deletions
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24
src/sqliteLimit.h
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@@ -206,27 +206,3 @@
#ifndef SQLITE_MAX_TRIGGER_DEPTH
# define SQLITE_MAX_TRIGGER_DEPTH 1000
#endif
/*
** Default maximum size of memory used by xFetch in the VFS.
*/
#ifdef SQLITE_DISABLE_MMAP
# undef SQLITE_DEFAULT_MMAP_LIMIT
# define SQLITE_DEFAULT_MMAP_LIMIT 0
#endif
#ifdef __APPLE__
# include <TargetConditionals.h>
# if TARGET_OS_IPHONE
# define SQLITE_DEFAULT_MMAP_LIMIT 0
# endif
#endif
#ifndef SQLITE_DEFAULT_MMAP_LIMIT
# if defined(__linux__) \
|| defined(_WIN32) \
|| (defined(__APPLE__) && defined(__MACH__)) \
|| defined(__sun)
# define SQLITE_DEFAULT_MMAP_LIMIT 268435456 /* = 256*1024*1024 */
# else
# define SQLITE_DEFAULT_MMAP_LIMIT 0
# endif
#endif