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Add the sqlite3_io_methods.xMremap() method to the VFS interface. Also "PRAGMA mmap_size".

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FossilOrigin-Name: 6183f1bd86ceed76d22d9762f3d7eb33262c62d1
This commit is contained in:
dan
2013-03-19 19:28:06 +00:00
parent a72014faf5
commit 5d8a137218
18 changed files with 263 additions and 110 deletions
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41
src/os_unix.c
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@@ -4429,6 +4429,42 @@ static int unixShmUnmap(
# define unixShmUnmap 0
#endif /* #ifndef SQLITE_OMIT_WAL */
/*
** Map, remap or unmap part of the database file.
*/
static int unixMremap(
sqlite3_file *fd, /* Main database file */
sqlite3_int64 iOff, /* Offset to start mapping at */
sqlite3_int64 nOld, /* Size of old mapping, or zero */
sqlite3_int64 nNew, /* Size of new mapping, or zero */
void **ppMap /* IN/OUT: Old/new mappings */
){
unixFile *p = (unixFile *)fd; /* The underlying database file */
int rc = SQLITE_OK; /* Return code */
void *pNew = 0; /* New mapping */
assert( iOff==0 );
if( nOld!=0 ){
void *pOld = *ppMap;
munmap(pOld, nOld);
}
if( nNew>0 ){
int flags = PROT_READ;
if( (p->ctrlFlags & UNIXFILE_RDONLY)==0 ) flags |= PROT_WRITE;
nNew = (nNew+4095) & ~(i64)((1 << 12)-1);
pNew = mmap(0, nNew, flags, MAP_SHARED, p->h, iOff);
if( pNew==MAP_FAILED ){
pNew = 0;
rc = SQLITE_IOERR;
}
}
*ppMap = pNew;
return rc;
}
/*
** Here ends the implementation of all sqlite3_file methods.
**
@@ -4487,7 +4523,8 @@ static const sqlite3_io_methods METHOD = { \
unixShmMap, /* xShmMap */ \
unixShmLock, /* xShmLock */ \
unixShmBarrier, /* xShmBarrier */ \
unixShmUnmap /* xShmUnmap */ \
unixShmUnmap, /* xShmUnmap */ \
unixMremap, /* xMremap */ \
}; \
static const sqlite3_io_methods *FINDER##Impl(const char *z, unixFile *p){ \
UNUSED_PARAMETER(z); UNUSED_PARAMETER(p); \
@@ -4504,7 +4541,7 @@ static const sqlite3_io_methods *(*const FINDER)(const char*,unixFile *p) \
IOMETHODS(
posixIoFinder, /* Finder function name */
posixIoMethods, /* sqlite3_io_methods object name */
2, /* shared memory is enabled */
3, /* shared memory and mmap are enabled */
unixClose, /* xClose method */
unixLock, /* xLock method */
unixUnlock, /* xUnlock method */