In the btree.c, when releasing the page1 lock, first make sure the

pager has not reset and released the lock already.  This fixes a bug
introduced by (3549). (CVS 3563)

FossilOrigin-Name: 36a2db96efa7f227c0a39e58fd83d56cc491472b

manifest

@@ -1,5 +1,5 @@
-C Get\sthreadtest2.c\sworking\sagain\safter\sbeing\slong\sneglected.\s(CVS\s3562)
-D 2007-01-05T01:58:27
+C In\sthe\sbtree.c,\swhen\sreleasing\sthe\spage1\slock,\sfirst\smake\ssure\sthe\npager\shas\snot\sreset\sand\sreleased\sthe\slock\salready.\s\sThis\sfixes\sa\sbug\nintroduced\sby\s(3549).\s(CVS\s3563)
+D 2007-01-05T02:00:47
 F Makefile.in 63a71177ed4355c829229affe11167bd28c85884
 F Makefile.linux-gcc 2d8574d1ba75f129aba2019f0b959db380a90935
 F README 9c4e2d6706bdcc3efdd773ce752a8cdab4f90028
@@ -57,7 +57,7 @@ F src/alter.c 2c79ec40f65e33deaf90ca493422c74586e481a3
 F src/analyze.c 7d2b7ab9a9c2fd6e55700f69064dfdd3e36d7a8a
 F src/attach.c b11eb4d5d3fb99a10a626956bccc7215f6b68b16
 F src/auth.c 902f4722661c796b97f007d9606bd7529c02597f
-F src/btree.c e7d1694ad0844918e20b802a249533789bf811dc
+F src/btree.c 6837dcc4da8677e695a49fcc4505418ff1e0fc54
 F src/btree.h 061c50e37de7f50b58528e352d400cf33ead7418
 F src/build.c 02aedde724dc73295d6e9b8dc29afb5dd38de507
 F src/callback.c fd9bb39f7ff6b52bad8365617abc61c720640429
@@ -85,7 +85,7 @@ F src/os_unix.c 9fbbd8ab0a6b3992370ba0f3aae11feff2a78c96
 F src/os_unix.h 5768d56d28240d3fe4537fac08cc85e4fb52279e
 F src/os_win.c 92df146ed964401969831a19bb490d76ce4de4c0
 F src/os_win.h 41a946bea10f61c158ce8645e7646b29d44f122b
-F src/pager.c 48296c371c44bf43f1c02e221142149797f33072
+F src/pager.c d6ad66eb119602cb2e6a097f8f635372ba677d23
 F src/pager.h 2e6d42f4ae004ae748a037b8468112b851c447a7
 F src/parse.y 2f571c5f6219428d7fb08737db3d113742b1cceb
 F src/pragma.c fd4df6cf0857dd78a7cb5be5f9805419b53ae7a0
@@ -424,7 +424,7 @@ F www/tclsqlite.tcl bb0d1357328a42b1993d78573e587c6dcbc964b9
 F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
 F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
 F www/whentouse.tcl 97e2b5cd296f7d8057e11f44427dea8a4c2db513
-P c28664d314b8caa2844072ee9e5a50901996dc1e
-R d3860e79b5446a0a1dfcf30d4a72043d
+P 06216d0d3be38bfabda9f5f450a5eaccd20b52b9
+R 88a6682f27b71c9c3c9099b414f32bc9
 U drh
-Z c3e34cb4afa4398fa1c661a71381ed9d
+Z 6815214498fce035470cac08b531711b

manifest.uuid

@@ -1 +1 @@
-06216d0d3be38bfabda9f5f450a5eaccd20b52b9
+36a2db96efa7f227c0a39e58fd83d56cc491472b

src/btree.c

@@ -9,7 +9,7 @@
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** $Id: btree.c,v 1.332 2006/12/18 18:34:51 drh Exp $
+** $Id: btree.c,v 1.333 2007/01/05 02:00:47 drh Exp $
 **
 ** This file implements a external (disk-based) database using BTrees.
 ** For a detailed discussion of BTrees, refer to
@@ -1931,13 +1931,15 @@ static int lockBtreeWithRetry(Btree *pRef){
 */
 static void unlockBtreeIfUnused(BtShared *pBt){
   if( pBt->inTransaction==TRANS_NONE && pBt->pCursor==0 && pBt->pPage1!=0 ){
-    if( pBt->pPage1->aData==0 ){
-      MemPage *pPage = pBt->pPage1;
-      pPage->aData = &((u8*)pPage)[-pBt->pageSize];
-      pPage->pBt = pBt;
-      pPage->pgno = 1;
+    if( sqlite3pager_refcount(pBt->pPager)>=1 ){
+      if( pBt->pPage1->aData==0 ){
+        MemPage *pPage = pBt->pPage1;
+        pPage->aData = &((u8*)pPage)[-pBt->pageSize];
+        pPage->pBt = pBt;
+        pPage->pgno = 1;
+      }
+      releasePage(pBt->pPage1);
     }
-    releasePage(pBt->pPage1);
     pBt->pPage1 = 0;
     pBt->inStmt = 0;
   }
@@ -6424,7 +6426,6 @@ int sqlite3BtreeCopyFile(Btree *pTo, Btree *pFrom){
     rc = sqlite3pager_get(pBtFrom->pPager, i, &pPage);
     if( rc ) break;
     rc = sqlite3pager_overwrite(pBtTo->pPager, i, pPage);
-    if( rc ) break;
     sqlite3pager_unref(pPage);
   }
   for(i=nPage+1; rc==SQLITE_OK && i<=nToPage; i++){

src/pager.c

@@ -18,7 +18,7 @@
 ** file simultaneously, or one process from reading the database while
 ** another is writing.
 **
-** @(#) $Id: pager.c,v 1.281 2007/01/04 14:58:14 drh Exp $
+** @(#) $Id: pager.c,v 1.282 2007/01/05 02:00:47 drh Exp $
 */
 #ifndef SQLITE_OMIT_DISKIO
 #include "sqliteInt.h"
@@ -379,8 +379,8 @@ static const unsigned char aJournalMagic[] = {
     static int cnt = 0;
     if( !pager3_refinfo_enable ) return;
     sqlite3DebugPrintf(
-       "REFCNT: %4d addr=%p nRef=%d\n",
-       p->pgno, PGHDR_TO_DATA(p), p->nRef
+       "REFCNT: %4d addr=%p nRef=%-3d total=%d\n",
+       p->pgno, PGHDR_TO_DATA(p), p->nRef, p->pPager->nRef
     );
     cnt++;   /* Something to set a breakpoint on */
   }