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Overview
| Comment: | Add a fix for the assert() statements added by the previous commit. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | experimental-mmap |
| Files: | files | file ages | folders |
| SHA1: | 19345416ed5e1ab5b0b35993b0b9069c2fb1683b |
| User & Date: | dan 2013-03-22 17:46:11 |
Context
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2013-03-22
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| 18:20 | Allow the database file to be memory mapped in wal mode. check-in: d190ddab user: dan tags: experimental-mmap | |
| 17:46 | Add a fix for the assert() statements added by the previous commit. check-in: 19345416 user: dan tags: experimental-mmap | |
| 08:58 | Add assert statements to os_unix.c to ensure that any mapped region of the database file is not being read or written using the xRead() or xWrite() methods. check-in: 765615f9 user: dan tags: experimental-mmap | |
Changes
Changes to src/os_unix.c.
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** that effectively updates the change counter. This might happen
** when restoring a database using the backup API from a zero-length
** source.
*/
if( pFile->inNormalWrite && nByte==0 ){
pFile->transCntrChng = 1;
}
#endif
return SQLITE_OK;
}
}
/*
................................................................................
unixFile *p = (unixFile *)fd; /* The underlying database file */
int rc = SQLITE_OK; /* Return code */
void *pNew = 0; /* New mapping */
i64 nNewRnd; /* nNew rounded up */
i64 nOldRnd; /* nOld rounded up */
assert( iOff==0 );
assert( p->mmapSize==nOld );
assert( p->pMapRegion==0 || p->pMapRegion==(*ppMap) );
/* If the SQLITE_MREMAP_EXTEND flag is set, then the size of the requested
** mapping (nNew bytes) may be greater than the size of the database file.
** If this is the case, extend the file on disk using ftruncate(). */
assert( nNew>0 || (flags & SQLITE_MREMAP_EXTEND)==0 );
if( flags & SQLITE_MREMAP_EXTEND ){
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** that effectively updates the change counter. This might happen
** when restoring a database using the backup API from a zero-length
** source.
*/
if( pFile->inNormalWrite && nByte==0 ){
pFile->transCntrChng = 1;
}
/* If the file was just truncated to a size smaller than the currently
** mapped region, reduce the effective mapping size as well. SQLite will
** use read() and write() to access data beyond this point from now on.
*/
if( nByte<pFile->mmapSize ){
pFile->mmapSize = nByte;
}
#endif
return SQLITE_OK;
}
}
/*
................................................................................
unixFile *p = (unixFile *)fd; /* The underlying database file */
int rc = SQLITE_OK; /* Return code */
void *pNew = 0; /* New mapping */
i64 nNewRnd; /* nNew rounded up */
i64 nOldRnd; /* nOld rounded up */
assert( iOff==0 );
/* assert( p->mmapSize==nOld ); */
assert( p->pMapRegion==0 || p->pMapRegion==(*ppMap) );
/* If the SQLITE_MREMAP_EXTEND flag is set, then the size of the requested
** mapping (nNew bytes) may be greater than the size of the database file.
** If this is the case, extend the file on disk using ftruncate(). */
assert( nNew>0 || (flags & SQLITE_MREMAP_EXTEND)==0 );
if( flags & SQLITE_MREMAP_EXTEND ){
|