Change an unreachable condition in PagerSharedLock to a NEVER(...). Add an assert to pager_error() to show that it is never called to put an in-memory pager to the error-state. (CVS 6941)

FossilOrigin-Name: 1d931f77519baf3586708c77cbd161c0e75bcbaf

manifest

@@ -1,5 +1,5 @@
-C Change\sa\scondition\sto\sa\s'%'\soperator\sin\sbitvec.c.\s(CVS\s6940)
-D 2009-07-25T17:33:26
+C Change\san\sunreachable\scondition\sin\sPagerSharedLock\sto\sa\sNEVER(...).\sAdd\san\sassert\sto\spager_error()\sto\sshow\sthat\sit\sis\snever\scalled\sto\sput\san\sin-memory\spager\sto\sthe\serror-state.\s(CVS\s6941)
+D 2009-07-25T17:39:14
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in df9359da7a726ccb67a45db905c5447d5c00c6ef
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -147,7 +147,7 @@ F src/os_common.h 8c61457df58f1a4bd5f5adc3e90e01b37bf7afbc
 F src/os_os2.c bed77dc26e3a95ce4a204936b9a1ca6fe612fcc5
 F src/os_unix.c cdb2a08b9ce4aa13b3f7b91d4dd60fb48be9f56a
 F src/os_win.c 725c38a524d168ce280446ad8761d731bc516405
-F src/pager.c e9d23aef33b7669ab7df24070d371f7e5d21cca1
+F src/pager.c f050740b628e564d10b7269170f7c62e91286a84
 F src/pager.h 11852d044c86cf5a9d6e34171fb0c4fcf1f6265f
 F src/parse.y bcd46d43fbd23a22b8c020a3eb1806b794794ed5
 F src/pcache.c c92ffd4f3e1279b3766854c6d18b5bf4aac0d1fa
@@ -738,7 +738,7 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl 672f81d693a03f80f5ae60bfefacd8a349e76746
-P 533d6cc67a3b6467db5b83c5ca535d229d36ad27
-R b24dc1060c0e41c7234c2870603ba4a6
-U drh
-Z 737abbbb5ad16338e62e8e8aa8bd1e9e
+P 10250fe5c039dbef2e1614e6320f7bd354c10211
+R 99775dd1d9caf07f15aac6d35493d7a6
+U danielk1977
+Z 48c380c40fd307d2d3f58af91056b3e0

manifest.uuid

@@ -1 +1 @@
-10250fe5c039dbef2e1614e6320f7bd354c10211
+1d931f77519baf3586708c77cbd161c0e75bcbaf

src/pager.c

@@ -18,7 +18,7 @@
 ** file simultaneously, or one process from reading the database while
 ** another is writing.
 **
-** @(#) $Id: pager.c,v 1.624 2009/07/25 17:08:36 drh Exp $
+** @(#) $Id: pager.c,v 1.625 2009/07/25 17:39:14 danielk1977 Exp $
 */
 #ifndef SQLITE_OMIT_DISKIO
 #include "sqliteInt.h"
@@ -1174,6 +1174,7 @@ static void pager_unlock(Pager *pPager){
 */
 static int pager_error(Pager *pPager, int rc){
   int rc2 = rc & 0xff;
+  assert( rc==SQLITE_OK || !MEMDB );
   assert(
        pPager->errCode==SQLITE_FULL ||
        pPager->errCode==SQLITE_OK ||
@@ -3597,12 +3598,13 @@ int sqlite3PagerSharedLock(Pager *pPager){
   /* This routine is only called from b-tree and only when there are no
   ** outstanding pages */
   assert( sqlite3PcacheRefCount(pPager->pPCache)==0 );
+  if( NEVER(MEMDB && pPager->errCode) ){ return pPager->errCode; }
 
   /* If this database is in an error-state, now is a chance to clear
   ** the error. Discard the contents of the pager-cache and rollback
   ** any hot journal in the file-system.
   */
-  if( !MEMDB && pPager->errCode ){
+  if( pPager->errCode ){
     if( isOpen(pPager->jfd) || pPager->zJournal ){
       isErrorReset = 1;
     }
@@ -3610,14 +3612,6 @@ int sqlite3PagerSharedLock(Pager *pPager){
     pager_reset(pPager);
   }
 
-  /* If the pager is still in an error state, do not proceed. The error 
-  ** state will be cleared at some point in the future when all page 
-  ** references are dropped and the cache can be discarded.
-  */
-  if( pPager->errCode && pPager->errCode!=SQLITE_FULL ){
-    return pPager->errCode;
-  }
-
   if( pPager->state==PAGER_UNLOCK || isErrorReset ){
     sqlite3_vfs * const pVfs = pPager->pVfs;
     int isHotJournal = 0;