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Cause the mmap_size PRAGMA to immediately change the mmap space if the

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database connection is already active.  In particular, reducing mmap_size
will immediately free up process address space.

FossilOrigin-Name: 761177927cb51e4f5e66061ca39cf37edbe8346b
This commit is contained in:
drh
2013-05-23 01:40:53 +00:00
parent d399fb3de8
commit 34e258c942
5 changed files with 127 additions and 17 deletions
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16
src/os_win.c
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@@ -2816,6 +2816,9 @@ static void winModeBit(winFile *pFile, unsigned char mask, int *pArg){
/* Forward declaration */
static int getTempname(int nBuf, char *zBuf);
#if SQLITE_MAX_MMAP_SIZE>0
static int winMapfile(winFile*, sqlite3_int64);
#endif
/*
** Control and query of the open file handle.
@@ -2899,13 +2902,20 @@ static int winFileControl(sqlite3_file *id, int op, void *pArg){
#if SQLITE_MAX_MMAP_SIZE>0
case SQLITE_FCNTL_MMAP_SIZE: {
i64 newLimit = *(i64*)pArg;
int rc = SQLITE_OK;
if( newLimit>sqlite3GlobalConfig.mxMmap ){
newLimit = sqlite3GlobalConfig.mxMmap;
}
*(i64*)pArg = pFile->mmapSizeMax;
if( newLimit>=0 ) pFile->mmapSizeMax = newLimit;
OSTRACE(("FCNTL file=%p, rc=SQLITE_OK\n", pFile->h));
return SQLITE_OK;
if( newLimit>=0 && newLimit!=pFile->mmapSizeMax && pFile->nFetchOut==0 ){
pFile->mmapSizeMax = newLimit;
if( pFile->mmapSize>0 ){
(void)winUnmapfile(pFile);
rc = winMapfile(pFile, -1);
}
}
OSTRACE(("FCNTL file=%p, rc=%d\n", pFile->h, rc));
return rc;
}
#endif
}