Avoid attempting to reclaim memory from in-memory databases in sqlite3_release_memory(). (CVS 3812)

FossilOrigin-Name: c20f7563c0ffa1df47df5464f1f1cc4703ffa9b4

manifest

@@ -1,5 +1,5 @@
-C Add\ssome\sassert()\sstatements\sto\spager.c.\s(CVS\s3811)
-D 2007-04-05T11:54:43
+C Avoid\sattempting\sto\sreclaim\smemory\sfrom\sin-memory\sdatabases\sin\ssqlite3_release_memory().\s(CVS\s3812)
+D 2007-04-05T13:12:14
 F Makefile.in 29fbf08ce0989973bfed0b5a052a6bdf3e60fd0a
 F Makefile.linux-gcc 2d8574d1ba75f129aba2019f0b959db380a90935
 F README 9c4e2d6706bdcc3efdd773ce752a8cdab4f90028
@@ -86,7 +86,7 @@ F src/os_unix.c 13c6f73a7b0c2c6c131c97ea26274db101b594cd
 F src/os_unix.h 5768d56d28240d3fe4537fac08cc85e4fb52279e
 F src/os_win.c c9a99524d6b2bdec636264cad1b67553925e3309
 F src/os_win.h 41a946bea10f61c158ce8645e7646b29d44f122b
-F src/pager.c 52f2212429310cb4d2080d36b63d16cc42161a6f
+F src/pager.c 82dca058bfb68aa34a3ff330bc9ad466035375ae
 F src/pager.h e79a24cf200b8771366217f5bca414f5b7823f42
 F src/parse.y 207ab04273ae13aa4a729b96008d294d5f334ab3
 F src/pragma.c 3b992b5b2640d6ae25cef05aa6a42cd1d6c43234
@@ -263,7 +263,7 @@ F test/malloc.test d868a6b98b07928b00bca3d9874daf6885c86150
 F test/malloc2.test 4ed7d719542c4570dec9c2ebe2bbdf3a9f3b0d05
 F test/malloc3.test e965954b6f808876a63d3101fd70370320b509a7
 F test/malloc4.test 59cd02f71b363302a04c4e77b97c0a1572eaa210
-F test/malloc5.test 17a32bd72073741d539bb2a1307d712a316b89da
+F test/malloc5.test ab22dcb9f0babc57126f55bfc6a6b6c7dd51c6cc
 F test/malloc6.test 025ae0b78542e0ddd000d23f79d93e9be9ba0f15
 F test/malloc7.test 1cf52834509eac7ebeb92105dacd4669f9ca9869
 F test/manydb.test 8de36b8d33aab5ef295b11d9e95310aeded31af8
@@ -450,7 +450,7 @@ F www/tclsqlite.tcl bb0d1357328a42b1993d78573e587c6dcbc964b9
 F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
 F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
 F www/whentouse.tcl 97e2b5cd296f7d8057e11f44427dea8a4c2db513
-P 38af156da83a8469080ddb75a9a286be33ff6bef
-R 28d04fcd2d61aa62015dffc325fe3e28
+P 973b2a5fb56a1ed1fd10d062edcb6e6dad13f001
+R 3d61a3bac9e818ce7c0c533a6c40bb32
 U danielk1977
-Z df28133608de4a90d3e36cfb35940c5f
+Z 27fd82d7f84e6401bc77ed2f6bdb8478

manifest.uuid

@@ -1 +1 @@
-973b2a5fb56a1ed1fd10d062edcb6e6dad13f001
+c20f7563c0ffa1df47df5464f1f1cc4703ffa9b4

src/pager.c

@@ -18,7 +18,7 @@
 ** file simultaneously, or one process from reading the database while
 ** another is writing.
 **
-** @(#) $Id: pager.c,v 1.320 2007/04/05 11:54:43 danielk1977 Exp $
+** @(#) $Id: pager.c,v 1.321 2007/04/05 13:12:14 danielk1977 Exp $
 */
 #ifndef SQLITE_OMIT_DISKIO
 #include "sqliteInt.h"
@@ -2525,6 +2525,8 @@ static int pager_recycle(Pager *pPager, int syncOk, PgHdr **ppPg){
   PgHdr *pPg;
   *ppPg = 0;
 
+  assert(!MEMDB);
+
   /* Find a page to recycle.  Try to locate a page that does not
   ** require us to do an fsync() on the journal.
   */
@@ -2568,7 +2570,6 @@ static int pager_recycle(Pager *pPager, int syncOk, PgHdr **ppPg){
   if( pPg->dirty ){
     int rc;
     assert( pPg->needSync==0 );
-    assert( !MEMDB );
     makeClean(pPg);
     pPg->dirty = 1;
     pPg->pDirty = 0;
@@ -2640,6 +2641,12 @@ int sqlite3PagerReleaseMemory(int nReq){
       PgHdr *pPg;
       int rc;
 
+#ifndef SQLITE_OMIT_MEMORYDB
+      if( p->memDb ){
+        continue;
+      }
+#endif
+
       /* For each pager, try to free as many pages as possible (without 
       ** calling fsync() if this is the first iteration of the outermost 
       ** loop).
@@ -2842,10 +2849,10 @@ static int pagerAllocatePage(Pager *pPager, PgHdr **ppPg){
   int rc = SQLITE_OK;
   PgHdr *pPg;
 
-  if( !(pPager->pFirstSynced && pPager->pFirstSynced->pgno==0) && (
-      pPager->nPage<pPager->mxPage || pPager->pFirst==0 || MEMDB ||
+  if( MEMDB || (!(pPager->pFirstSynced && pPager->pFirstSynced->pgno==0) && (
+      pPager->nPage<pPager->mxPage || pPager->pFirst==0 || 
       (pPager->pFirstSynced==0 && pPager->doNotSync)
-  ) ){
+  )) ){
     /* Create a new page */
     if( pPager->nPage>=pPager->nHash ){
       pager_resize_hash_table(pPager,

test/malloc5.test

@@ -12,7 +12,7 @@
 # This file contains test cases focused on the two memory-management APIs, 
 # sqlite3_soft_heap_limit() and sqlite3_release_memory().
 #
-# $Id: malloc5.test,v 1.8 2007/04/02 05:07:48 danielk1977 Exp $
+# $Id: malloc5.test,v 1.9 2007/04/05 13:12:14 danielk1977 Exp $
 
 #---------------------------------------------------------------------------
 # NOTES ON EXPECTED BEHAVIOUR
@@ -221,7 +221,40 @@ do_test malloc5-4.3 {
 
 # Restore the soft heap limit.
 sqlite3_soft_heap_limit $::soft_limit
-finish_test
 
+# Test that there are no problems calling sqlite3_release_memory when
+# there are open in-memory databases.
+#
+# At one point these tests would cause a seg-fault.
+#
+do_test malloc5-5.1 {
+  db close
+  sqlite3 db :memory:
+  execsql {
+    BEGIN;
+    CREATE TABLE abc(a, b, c);
+    INSERT INTO abc VALUES('abcdefghi', 1234567890, NULL);
+    INSERT INTO abc SELECT * FROM abc;
+    INSERT INTO abc SELECT * FROM abc;
+    INSERT INTO abc SELECT * FROM abc;
+    INSERT INTO abc SELECT * FROM abc;
+    INSERT INTO abc SELECT * FROM abc;
+    INSERT INTO abc SELECT * FROM abc;
+    INSERT INTO abc SELECT * FROM abc;
+  }
+  sqlite3_release_memory
+} 0
+do_test malloc5-5.1 {
+  sqlite3_soft_heap_limit 5000
+  execsql {
+    COMMIT;
+    PRAGMA temp_store = memory;
+    SELECT * FROM abc ORDER BY a;
+  }
+  expr 1
+} {1}
+
+sqlite3_soft_heap_limit $::soft_limit
+finish_test
 catch {db close}