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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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3
src/shell.c
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@@ -3060,7 +3060,8 @@ int main(int argc, char **argv){
sqlite3_multiplex_initialize(0, 1);
#endif
}else if( strcmp(z,"-mmap")==0 ){
sqlite3_config(SQLITE_CONFIG_MMAP_LIMIT, integerValue(cmdline_option_value(argc,argv,++i)));
sqlite3_int64 sz = integerValue(cmdline_option_value(argc,argv,++i));
sqlite3_config(SQLITE_CONFIG_MMAP_SIZE, sz, sz);
}else if( strcmp(z,"-vfs")==0 ){
sqlite3_vfs *pVfs = sqlite3_vfs_find(cmdline_option_value(argc,argv,++i));
if( pVfs ){