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Overview
| Comment: | Merge accidental fork. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | experimental-mmap |
| Files: | files | file ages | folders |
| SHA1: | 5f4437c0e35c8aa740515aac3e81e0146716d2bb |
| User & Date: | dan 2013-04-01 17:58:10 |
Context
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2013-04-01
| ||
| 18:15 | In windows, round down the size of the memory mapped region to the next smaller multiple of the page size. check-in: 0e44ed1b user: drh tags: experimental-mmap | |
| 17:58 | Merge accidental fork. check-in: 5f4437c0 user: dan tags: experimental-mmap | |
| 17:56 | Attempt to emulate mremap() on non-Linux systems by allocating a second mapping immediately following the first in virtual memory. check-in: 4d67433d user: dan tags: experimental-mmap | |
| 17:56 | Bug fix in the winMapfile() subroutine: Be sure to record the map object handle in the sqlite3_file object. check-in: ee4d188e user: drh tags: experimental-mmap | |
Changes
Changes to src/os_win.c.
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** SQLITE_OK is returned if no error occurs (even if the mapping is not
** recreated as a result of outstanding references) or an SQLite error
** code otherwise.
*/
static int winMapfile(winFile *pFd, sqlite3_int64 nByte){
sqlite3_int64 nMap = nByte;
int rc;
HANDLE hMap = NULL; /* New mapping handle */
assert( nMap>=0 || pFd->nFetchOut==0 );
if( pFd->nFetchOut>0 ) return SQLITE_OK;
if( nMap<0 ){
rc = winFileSize((sqlite3_file*)pFd, &nMap);
if( rc ){
................................................................................
winUnmapfile(pFd);
if( (pFd->ctrlFlags & WINFILE_RDONLY)==0 ){
protect = PAGE_READWRITE;
flags |= FILE_MAP_WRITE;
}
#if SQLITE_OS_WINRT
hMap = osCreateFileMappingFromApp(pFd->h, NULL, protect, nMap, NULL);
#elif defined(SQLITE_WIN32_HAS_WIDE)
hMap = osCreateFileMappingW(pFd->h, NULL, protect,
(DWORD)((nMap>>32) & 0xffffffff),
(DWORD)(nMap & 0xffffffff), NULL);
#elif defined(SQLITE_WIN32_HAS_ANSI)
hMap = osCreateFileMappingA(pFd->h, NULL, protect,
(DWORD)((nMap>>32) & 0xffffffff),
(DWORD)(nMap & 0xffffffff), NULL);
#endif
if( hMap==NULL ){
pFd->lastErrno = osGetLastError();
rc = winLogError(SQLITE_IOERR_MMAP, pFd->lastErrno,
"winMapfile", pFd->zPath);
/* Log the error, but continue normal operation using xRead/xWrite */
return SQLITE_OK;
}
assert( (nNewRnd % winSysInfo.dwPageSize)==0 );
#if SQLITE_OS_WINRT
pNew = osMapViewOfFileFromApp(hMap, flags, 0, nMap);
#else
pNew = osMapViewOfFile(hMap, flags, 0, 0, (SIZE_T)nMap);
#endif
if( pNew==NULL ){
osCloseHandle(hMap);
hMap = NULL;
pFd->lastErrno = osGetLastError();
winLogError(SQLITE_IOERR_MMAP, pFd->lastErrno,
"winMapfile", pFd->zPath);
return SQLITE_OK;
}
pFd->pMapRegion = pNew;
pFd->mmapSize = nMap;
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** SQLITE_OK is returned if no error occurs (even if the mapping is not
** recreated as a result of outstanding references) or an SQLite error
** code otherwise.
*/
static int winMapfile(winFile *pFd, sqlite3_int64 nByte){
sqlite3_int64 nMap = nByte;
int rc;
assert( nMap>=0 || pFd->nFetchOut==0 );
if( pFd->nFetchOut>0 ) return SQLITE_OK;
if( nMap<0 ){
rc = winFileSize((sqlite3_file*)pFd, &nMap);
if( rc ){
................................................................................
winUnmapfile(pFd);
if( (pFd->ctrlFlags & WINFILE_RDONLY)==0 ){
protect = PAGE_READWRITE;
flags |= FILE_MAP_WRITE;
}
#if SQLITE_OS_WINRT
pFd->hMap = osCreateFileMappingFromApp(pFd->h, NULL, protect, nMap, NULL);
#elif defined(SQLITE_WIN32_HAS_WIDE)
pFd->hMap = osCreateFileMappingW(pFd->h, NULL, protect,
(DWORD)((nMap>>32) & 0xffffffff),
(DWORD)(nMap & 0xffffffff), NULL);
#elif defined(SQLITE_WIN32_HAS_ANSI)
pFd->hMap = osCreateFileMappingA(pFd->h, NULL, protect,
(DWORD)((nMap>>32) & 0xffffffff),
(DWORD)(nMap & 0xffffffff), NULL);
#endif
if( pFd->hMap==NULL ){
pFd->lastErrno = osGetLastError();
rc = winLogError(SQLITE_IOERR_MMAP, pFd->lastErrno,
"winMapfile", pFd->zPath);
/* Log the error, but continue normal operation using xRead/xWrite */
return SQLITE_OK;
}
assert( (nNewRnd % winSysInfo.dwPageSize)==0 );
#if SQLITE_OS_WINRT
pNew = osMapViewOfFileFromApp(pFd->hMap, flags, 0, nMap);
#else
pNew = osMapViewOfFile(pFd->hMap, flags, 0, 0, (SIZE_T)nMap);
#endif
if( pNew==NULL ){
osCloseHandle(pFd->hMap);
pFd->hMap = NULL;
pFd->lastErrno = osGetLastError();
winLogError(SQLITE_IOERR_MMAP, pFd->lastErrno,
"winMapfile", pFd->zPath);
return SQLITE_OK;
}
pFd->pMapRegion = pNew;
pFd->mmapSize = nMap;
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