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Overview
| Comment: | When using mmap mode on Win32, use a read-only mapping by default. Write to the database file using WriteFile(). Unless SQLITE_MMAP_READWRITE is defined, in which case use a read/write mapping and write into the file using memcpy(). |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
4f521b5bb36a1117db324e92dcf80abd |
| User & Date: | mistachkin 2015-11-17 21:42:32 |
Context
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2015-11-19
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| 13:21 | Fix a 10-year-old misguided attempt at parser performance improvement that actually made parsing slightly slower. (check-in: 3833cbac user: drh tags: trunk) | |
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2015-11-18
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| 18:43 | If a table column name begins with "__hidden__" then do not include that column in "*" expansions in SELECT statements, nor fill in that column in an INSERT INTO that omits the column list. This branch is a proof-of-concept only and is not intended to ever be merged into trunk. (check-in: 2dbffb3a user: drh tags: hidden-columns-in-tables) | |
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2015-11-17
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| 21:42 | When using mmap mode on Win32, use a read-only mapping by default. Write to the database file using WriteFile(). Unless SQLITE_MMAP_READWRITE is defined, in which case use a read/write mapping and write into the file using memcpy(). (check-in: 4f521b5b user: mistachkin tags: trunk) | |
| 20:56 | When using mmap mode on unix, use a read-only mapping by default. Write to the database file using write(). Unless SQLITE_MMAP_READWRITE is defined, in which case use a read/write mapping and write into the file using memcpy(). (check-in: 67c5d3c6 user: dan tags: trunk) | |
Changes
Changes to src/os_win.c.
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SimulateIOError(return SQLITE_IOERR_WRITE);
SimulateDiskfullError(return SQLITE_FULL);
OSTRACE(("WRITE pid=%lu, pFile=%p, file=%p, buffer=%p, amount=%d, "
"offset=%lld, lock=%d\n", osGetCurrentProcessId(), pFile,
pFile->h, pBuf, amt, offset, pFile->locktype));
#if SQLITE_MAX_MMAP_SIZE>0
/* Deal with as much of this write request as possible by transfering
** data from the memory mapping using memcpy(). */
if( offset<pFile->mmapSize ){
if( offset+amt <= pFile->mmapSize ){
memcpy(&((u8 *)(pFile->pMapRegion))[offset], pBuf, amt);
OSTRACE(("WRITE-MMAP pid=%lu, pFile=%p, file=%p, rc=SQLITE_OK\n",
osGetCurrentProcessId(), pFile, pFile->h));
................................................................................
}
if( nMap!=pFd->mmapSize ){
void *pNew = 0;
DWORD protect = PAGE_READONLY;
DWORD flags = FILE_MAP_READ;
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)
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SimulateIOError(return SQLITE_IOERR_WRITE);
SimulateDiskfullError(return SQLITE_FULL);
OSTRACE(("WRITE pid=%lu, pFile=%p, file=%p, buffer=%p, amount=%d, "
"offset=%lld, lock=%d\n", osGetCurrentProcessId(), pFile,
pFile->h, pBuf, amt, offset, pFile->locktype));
#if defined(SQLITE_MMAP_READWRITE) && SQLITE_MAX_MMAP_SIZE>0
/* Deal with as much of this write request as possible by transfering
** data from the memory mapping using memcpy(). */
if( offset<pFile->mmapSize ){
if( offset+amt <= pFile->mmapSize ){
memcpy(&((u8 *)(pFile->pMapRegion))[offset], pBuf, amt);
OSTRACE(("WRITE-MMAP pid=%lu, pFile=%p, file=%p, rc=SQLITE_OK\n",
osGetCurrentProcessId(), pFile, pFile->h));
................................................................................
}
if( nMap!=pFd->mmapSize ){
void *pNew = 0;
DWORD protect = PAGE_READONLY;
DWORD flags = FILE_MAP_READ;
winUnmapfile(pFd);
#ifdef SQLITE_MMAP_READWRITE
if( (pFd->ctrlFlags & WINFILE_RDONLY)==0 ){
protect = PAGE_READWRITE;
flags |= FILE_MAP_WRITE;
}
#endif
#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)
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