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Overview
| Comment: | Expand scope of the SQLITE_MAX_MMAP_SIZE define for the Win32 VFS. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
f4b8faab45e217f227bd7ce65d474175 |
| User & Date: | mistachkin 2013-04-15 20:08:27 |
Context
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2013-04-16
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| 14:52 | Disable memory-mapped I/O when the codec is enabled. check-in: 340cca30 user: drh tags: trunk | |
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2013-04-15
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| 20:08 | Expand scope of the SQLITE_MAX_MMAP_SIZE define for the Win32 VFS. check-in: f4b8faab user: mistachkin tags: trunk | |
| 17:03 | Refactoring the mmap interface. The controlling pragma is now "mmap_size" 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. check-in: ea1404a1 user: drh tags: trunk | |
Changes
Changes to src/os_win.c.
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#if SQLITE_OS_WINCE LPWSTR zDeleteOnClose; /* Name of file to delete when closing */ HANDLE hMutex; /* Mutex used to control access to shared lock */ HANDLE hShared; /* Shared memory segment used for locking */ winceLock local; /* Locks obtained by this instance of winFile */ winceLock *shared; /* Global shared lock memory for the file */ #endif int nFetchOut; /* Number of outstanding xFetch references */ HANDLE hMap; /* Handle for accessing memory mapping */ void *pMapRegion; /* Area memory mapped */ sqlite3_int64 mmapSize; /* Usable size of mapped region */ sqlite3_int64 mmapSizeActual; /* Actual size of mapped region */ sqlite3_int64 mmapSizeMax; /* Configured FCNTL_MMAP_SIZE value */ }; /* ** Allowed values for winFile.ctrlFlags */ #define WINFILE_RDONLY 0x02 /* Connection is read only */ #define WINFILE_PERSIST_WAL 0x04 /* Persistent WAL mode */ ................................................................................ return 1; } return 0; #endif } /* Forward references to VFS methods */ static int winUnmapfile(winFile*); /* ** Close a file. ** ** It is reported that an attempt to close a handle might sometimes ** fail. This is a very unreasonable result, but Windows is notorious ** for being unreasonable so I do not doubt that it might happen. If ................................................................................ assert( id!=0 ); #ifndef SQLITE_OMIT_WAL assert( pFile->pShm==0 ); #endif OSTRACE(("CLOSE %d\n", pFile->h)); assert( pFile->h!=NULL && pFile->h!=INVALID_HANDLE_VALUE ); rc = winUnmapfile(pFile); if( rc!=SQLITE_OK ) return rc; do{ rc = osCloseHandle(pFile->h); /* SimulateIOError( rc=0; cnt=MX_CLOSE_ATTEMPT; ); */ }while( rc==0 && ++cnt < MX_CLOSE_ATTEMPT && (sqlite3_win32_sleep(100), 1) ); #if SQLITE_OS_WINCE #define WINCE_DELETION_ATTEMPTS 3 ................................................................................ char *zTFile = sqlite3MallocZero( pFile->pVfs->mxPathname ); if( zTFile ){ getTempname(pFile->pVfs->mxPathname, zTFile); *(char**)pArg = zTFile; } return SQLITE_OK; } case SQLITE_FCNTL_MMAP_SIZE: { i64 newLimit = *(i64*)pArg; if( newLimit>sqlite3GlobalConfig.mxMmap ){ newLimit = sqlite3GlobalConfig.mxMmap; } *(i64*)pArg = pFile->mmapSizeMax; if( newLimit>=0 ) pFile->mmapSizeMax = newLimit; return SQLITE_OK; } } return SQLITE_NOTFOUND; } /* ** Return the sector size in bytes of the underlying block device for ** the specified file. This is almost always 512 bytes, but may be ................................................................................ # define winShmBarrier 0 # define winShmUnmap 0 #endif /* #ifndef SQLITE_OMIT_WAL */ /* ** Cleans up the mapped region of the specified file, if any. */ static int winUnmapfile(winFile *pFile){ assert( pFile!=0 ); #if SQLITE_MAX_MMAP_SIZE>0 if( pFile->pMapRegion ){ if( !osUnmapViewOfFile(pFile->pMapRegion) ){ pFile->lastErrno = osGetLastError(); return winLogError(SQLITE_IOERR_MMAP, pFile->lastErrno, "winUnmap1", pFile->zPath); } pFile->pMapRegion = 0; ................................................................................ if( !osCloseHandle(pFile->hMap) ){ pFile->lastErrno = osGetLastError(); return winLogError(SQLITE_IOERR_MMAP, pFile->lastErrno, "winUnmap2", pFile->zPath); } pFile->hMap = NULL; } #endif return SQLITE_OK; } #if SQLITE_MAX_MMAP_SIZE>0 /* ** Memory map or remap the file opened by file-descriptor pFd (if the file ** is already mapped, the existing mapping is replaced by the new). Or, if ** there already exists a mapping for this file, and there are still ** outstanding xFetch() references to it, this function is a no-op. ** ** If parameter nByte is non-negative, then it is the requested size of ................................................................................ ** Finally, if an error does occur, return an SQLite error code. The final ** value of *pp is undefined in this case. ** ** If this function does return a pointer, the caller must eventually ** release the reference by calling unixUnfetch(). */ static int winFetch(sqlite3_file *fd, i64 iOff, int nAmt, void **pp){ winFile *pFd = (winFile*)fd; /* The underlying database file */ *pp = 0; #if SQLITE_MAX_MMAP_SIZE>0 if( pFd->mmapSizeMax>0 ){ if( pFd->pMapRegion==0 ){ int rc = winMapfile(pFd, -1); if( rc!=SQLITE_OK ) return rc; ................................................................................ ** argument that was passed to the unixFetch() invocation. ** ** Or, if the third argument is NULL, then this function is being called ** to inform the VFS layer that, according to POSIX, any existing mapping ** may now be invalid and should be unmapped. */ static int winUnfetch(sqlite3_file *fd, i64 iOff, void *p){ winFile *pFd = (winFile*)fd; /* The underlying database file */ /* If p==0 (unmap the entire file) then there must be no outstanding ** xFetch references. Or, if p!=0 (meaning it is an xFetch reference), ** then there must be at least one outstanding. */ assert( (p==0)==(pFd->nFetchOut==0) ); ................................................................................ ** file while a mapping is held, then the following winUnmapfile() call ** is unnecessary can can be omitted - potentially improving ** performance. */ winUnmapfile(pFd); } assert( pFd->nFetchOut>=0 ); return SQLITE_OK; } /* ** Here ends the implementation of all sqlite3_file methods. ** ********************** End sqlite3_file Methods ******************************* ................................................................................ pFile->ctrlFlags |= WINFILE_RDONLY; } if( sqlite3_uri_boolean(zName, "psow", SQLITE_POWERSAFE_OVERWRITE) ){ pFile->ctrlFlags |= WINFILE_PSOW; } pFile->lastErrno = NO_ERROR; pFile->zPath = zName; pFile->hMap = NULL; pFile->pMapRegion = 0; pFile->mmapSize = 0; pFile->mmapSizeActual = 0; pFile->mmapSizeMax = sqlite3GlobalConfig.mxMmap; OpenCounter(+1); return rc; } /* ** Delete the named file. |
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#if SQLITE_OS_WINCE LPWSTR zDeleteOnClose; /* Name of file to delete when closing */ HANDLE hMutex; /* Mutex used to control access to shared lock */ HANDLE hShared; /* Shared memory segment used for locking */ winceLock local; /* Locks obtained by this instance of winFile */ winceLock *shared; /* Global shared lock memory for the file */ #endif #if SQLITE_MAX_MMAP_SIZE>0 int nFetchOut; /* Number of outstanding xFetch references */ HANDLE hMap; /* Handle for accessing memory mapping */ void *pMapRegion; /* Area memory mapped */ sqlite3_int64 mmapSize; /* Usable size of mapped region */ sqlite3_int64 mmapSizeActual; /* Actual size of mapped region */ sqlite3_int64 mmapSizeMax; /* Configured FCNTL_MMAP_SIZE value */ #endif }; /* ** Allowed values for winFile.ctrlFlags */ #define WINFILE_RDONLY 0x02 /* Connection is read only */ #define WINFILE_PERSIST_WAL 0x04 /* Persistent WAL mode */ ................................................................................ return 1; } return 0; #endif } #if SQLITE_MAX_MMAP_SIZE>0 /* Forward references to VFS methods */ static int winUnmapfile(winFile*); #endif /* ** Close a file. ** ** It is reported that an attempt to close a handle might sometimes ** fail. This is a very unreasonable result, but Windows is notorious ** for being unreasonable so I do not doubt that it might happen. If ................................................................................ assert( id!=0 ); #ifndef SQLITE_OMIT_WAL assert( pFile->pShm==0 ); #endif OSTRACE(("CLOSE %d\n", pFile->h)); assert( pFile->h!=NULL && pFile->h!=INVALID_HANDLE_VALUE ); #if SQLITE_MAX_MMAP_SIZE>0 rc = winUnmapfile(pFile); if( rc!=SQLITE_OK ) return rc; #endif do{ rc = osCloseHandle(pFile->h); /* SimulateIOError( rc=0; cnt=MX_CLOSE_ATTEMPT; ); */ }while( rc==0 && ++cnt < MX_CLOSE_ATTEMPT && (sqlite3_win32_sleep(100), 1) ); #if SQLITE_OS_WINCE #define WINCE_DELETION_ATTEMPTS 3 ................................................................................ char *zTFile = sqlite3MallocZero( pFile->pVfs->mxPathname ); if( zTFile ){ getTempname(pFile->pVfs->mxPathname, zTFile); *(char**)pArg = zTFile; } return SQLITE_OK; } #if SQLITE_MAX_MMAP_SIZE>0 case SQLITE_FCNTL_MMAP_SIZE: { i64 newLimit = *(i64*)pArg; if( newLimit>sqlite3GlobalConfig.mxMmap ){ newLimit = sqlite3GlobalConfig.mxMmap; } *(i64*)pArg = pFile->mmapSizeMax; if( newLimit>=0 ) pFile->mmapSizeMax = newLimit; return SQLITE_OK; } #endif } return SQLITE_NOTFOUND; } /* ** Return the sector size in bytes of the underlying block device for ** the specified file. This is almost always 512 bytes, but may be ................................................................................ # define winShmBarrier 0 # define winShmUnmap 0 #endif /* #ifndef SQLITE_OMIT_WAL */ /* ** Cleans up the mapped region of the specified file, if any. */ #if SQLITE_MAX_MMAP_SIZE>0 static int winUnmapfile(winFile *pFile){ assert( pFile!=0 ); if( pFile->pMapRegion ){ if( !osUnmapViewOfFile(pFile->pMapRegion) ){ pFile->lastErrno = osGetLastError(); return winLogError(SQLITE_IOERR_MMAP, pFile->lastErrno, "winUnmap1", pFile->zPath); } pFile->pMapRegion = 0; ................................................................................ if( !osCloseHandle(pFile->hMap) ){ pFile->lastErrno = osGetLastError(); return winLogError(SQLITE_IOERR_MMAP, pFile->lastErrno, "winUnmap2", pFile->zPath); } pFile->hMap = NULL; } return SQLITE_OK; } /* ** Memory map or remap the file opened by file-descriptor pFd (if the file ** is already mapped, the existing mapping is replaced by the new). Or, if ** there already exists a mapping for this file, and there are still ** outstanding xFetch() references to it, this function is a no-op. ** ** If parameter nByte is non-negative, then it is the requested size of ................................................................................ ** Finally, if an error does occur, return an SQLite error code. The final ** value of *pp is undefined in this case. ** ** If this function does return a pointer, the caller must eventually ** release the reference by calling unixUnfetch(). */ static int winFetch(sqlite3_file *fd, i64 iOff, int nAmt, void **pp){ #if SQLITE_MAX_MMAP_SIZE>0 winFile *pFd = (winFile*)fd; /* The underlying database file */ #endif *pp = 0; #if SQLITE_MAX_MMAP_SIZE>0 if( pFd->mmapSizeMax>0 ){ if( pFd->pMapRegion==0 ){ int rc = winMapfile(pFd, -1); if( rc!=SQLITE_OK ) return rc; ................................................................................ ** argument that was passed to the unixFetch() invocation. ** ** Or, if the third argument is NULL, then this function is being called ** to inform the VFS layer that, according to POSIX, any existing mapping ** may now be invalid and should be unmapped. */ static int winUnfetch(sqlite3_file *fd, i64 iOff, void *p){ #if SQLITE_MAX_MMAP_SIZE>0 winFile *pFd = (winFile*)fd; /* The underlying database file */ /* If p==0 (unmap the entire file) then there must be no outstanding ** xFetch references. Or, if p!=0 (meaning it is an xFetch reference), ** then there must be at least one outstanding. */ assert( (p==0)==(pFd->nFetchOut==0) ); ................................................................................ ** file while a mapping is held, then the following winUnmapfile() call ** is unnecessary can can be omitted - potentially improving ** performance. */ winUnmapfile(pFd); } assert( pFd->nFetchOut>=0 ); #endif return SQLITE_OK; } /* ** Here ends the implementation of all sqlite3_file methods. ** ********************** End sqlite3_file Methods ******************************* ................................................................................ pFile->ctrlFlags |= WINFILE_RDONLY; } if( sqlite3_uri_boolean(zName, "psow", SQLITE_POWERSAFE_OVERWRITE) ){ pFile->ctrlFlags |= WINFILE_PSOW; } pFile->lastErrno = NO_ERROR; pFile->zPath = zName; #if SQLITE_MAX_MMAP_SIZE>0 pFile->hMap = NULL; pFile->pMapRegion = 0; pFile->mmapSize = 0; pFile->mmapSizeActual = 0; pFile->mmapSizeMax = sqlite3GlobalConfig.mxMmap; #endif OpenCounter(+1); return rc; } /* ** Delete the named file. |