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Fix a threads/mutex problem in pcache.c. (CVS 5630)

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FossilOrigin-Name: 1928f15b78eee0fbf0a8ecdbbdd38dbbde2942b8
This commit is contained in:
danielk1977
2008-08-28 08:31:48 +00:00
parent a85f7e36e8
commit 51d2d03636
5 changed files with 131 additions and 13 deletions
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7
src/pcache.c
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@@ -11,7 +11,7 @@
*************************************************************************
** This file implements that page cache.
**
** @(#) $Id: pcache.c,v 1.19 2008/08/28 02:26:07 drh Exp $
** @(#) $Id: pcache.c,v 1.20 2008/08/28 08:31:48 danielk1977 Exp $
*/
#include "sqliteInt.h"
@@ -685,22 +685,23 @@ int sqlite3PcacheFetch(
/* Search the hash table for the requested page. Exit early if it is found. */
if( pCache->apHash ){
u32 h = pgno % pCache->nHash;
pcacheEnterMutex();
for(pPage=pCache->apHash[h]; pPage; pPage=pPage->pNextHash){
if( pPage->pgno==pgno ){
if( pPage->nRef==0 ){
if( 0==(pPage->flags&PGHDR_DIRTY) ){
pcacheEnterMutex();
pcacheRemoveFromLruList(pPage);
pcacheExitMutex();
pCache->nPinned++;
}
pCache->nRef++;
}
pPage->nRef++;
*ppPage = pPage;
pcacheExitMutex();
return SQLITE_OK;
}
}
pcacheExitMutex();
}
if( createFlag ){