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Overview
| Comment: | Use mremap() on Linux. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | experimental-mmap |
| Files: | files | file ages | folders |
| SHA1: |
431aecc8600c29c203546e48d2565105 |
| User & Date: | dan 2013-03-25 20:30:13 |
Context
|
2013-03-25
| ||
| 20:50 | Add munmap and mremap to the set of os interfaces that can be overloaded in os_unix.c. check-in: 8776047b user: drh tags: experimental-mmap | |
| 20:30 | Use mremap() on Linux. check-in: 431aecc8 user: dan tags: experimental-mmap | |
| 19:57 | Merge all recent trunk changes into the experimental-mmap branch. check-in: a607d63f user: drh tags: experimental-mmap | |
Changes
Changes to src/os_unix.c.
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nMap = statbuf.st_size;
}
if( nMap>pFd->mmapLimit ){
nMap = pFd->mmapLimit;
}
if( nMap!=pFd->mmapSize ){
unixUnmapfile(pFd);
if( nMap>0 ){
void *pNew;
int flags = PROT_READ;
if( (pFd->ctrlFlags & UNIXFILE_RDONLY)==0 ) flags |= PROT_WRITE;
pNew = osMmap(0, nMap, flags, MAP_SHARED, pFd->h, 0);
if( pNew==MAP_FAILED ){
return SQLITE_IOERR_MMAP;
}
pFd->pMapRegion = pNew;
pFd->mmapSize = nMap;
pFd->mmapOrigsize = nMap;
}
}
return SQLITE_OK;
}
/*
** If possible, return a pointer to a mapping of file fd starting at offset
|
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nMap = statbuf.st_size;
}
if( nMap>pFd->mmapLimit ){
nMap = pFd->mmapLimit;
}
if( nMap!=pFd->mmapSize ){
void *pNew = 0;
#if defined(__linux__) && defined(_GNU_SOURCE)
if( pFd->pMapRegion && nMap>0 ){
pNew = mremap(pFd->pMapRegion, pFd->mmapOrigsize, nMap, MREMAP_MAYMOVE);
}else
#endif
{
unixUnmapfile(pFd);
if( nMap>0 ){
int flags = PROT_READ;
if( (pFd->ctrlFlags & UNIXFILE_RDONLY)==0 ) flags |= PROT_WRITE;
pNew = osMmap(0, nMap, flags, MAP_SHARED, pFd->h, 0);
}
}
if( pNew==MAP_FAILED ){
return SQLITE_IOERR_MMAP;
}
pFd->pMapRegion = pNew;
pFd->mmapSize = nMap;
pFd->mmapOrigsize = nMap;
}
return SQLITE_OK;
}
/*
** If possible, return a pointer to a mapping of file fd starting at offset
|