Merge into trunk the changes that permit :memory: databases to use shared cache.

FossilOrigin-Name: e72179f3a43e4df36b7c2955eaacce6c804272c6

9 files changed, 89 insertions, 30 deletions

diff --git a/manifest b/manifest
index 6b8c4fa0b..219a7585c 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Merge\sfts4-unicode\sbranch\swith\strunk.
-D 2012-05-26T18:42:21.996
+C Merge\sinto\strunk\sthe\schanges\sthat\spermit\s:memory:\sdatabases\sto\suse\sshared\scache.
+D 2012-05-27T22:42:57.161
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 2f37e468503dbe79d35c9f6dffcf3fae1ae9ec20
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -123,7 +123,7 @@ F src/auth.c 523da7fb4979469955d822ff9298352d6b31de34
 F src/backup.c 6be23a344d3301ae38e92fddb3a33b91c309fce4
 F src/bitvec.c af50f1c8c0ff54d6bdb7a80e2fceca5a93670bef
 F src/btmutex.c 976f45a12e37293e32cae0281b15a21d48a8aaa7
-F src/btree.c df800f10896bc2ddaa1125c532d6e7a7b9efc532
+F src/btree.c 964c7862e1e27c543d2fff2e537ceadc4026c682
 F src/btree.h 48a013f8964f12d944d90e4700df47b72dd6d923
 F src/btreeInt.h 38a639c0542c29fe8331a221c4aed0cb8686249e
 F src/build.c 2bb2163bb1e69f59e9f36a9413079ead42fa1d2c
@@ -145,7 +145,7 @@ F src/journal.c 552839e54d1bf76fb8f7abe51868b66acacf6a0e
 F src/legacy.c a199d7683d60cef73089e892409113e69c23a99f
 F src/lempar.c 0ee69fca0be54cd93939df98d2aca4ca46f44416
 F src/loadext.c f20382fbaeec832438a1ba7797bee3d3c8a6d51d
-F src/main.c 91458c713e9b7f8dbc98d79e78f1150f0ca9c2a1
+F src/main.c a2cfba189be2c653eb274c39fc12f169bbb9baa3
 F src/malloc.c fe085aa851b666b7c375c1ff957643dc20a04bf6
 F src/mem0.c 6a55ebe57c46ca1a7d98da93aaa07f99f1059645
 F src/mem1.c b3677415e69603d6a0e7c5410a1b3731d55beda1
@@ -166,8 +166,8 @@ F src/os_common.h 92815ed65f805560b66166e3583470ff94478f04
 F src/os_os2.c 4a75888ba3dfc820ad5e8177025972d74d7f2440
 F src/os_unix.c 424d46e0edab969293c2223f09923b2178171f47
 F src/os_win.c 412d6434133c7c81dc48b7702f3ea5e61c309e5c
-F src/pager.c bb5635dde0b152797836d1c72275284724bb563c
-F src/pager.h ef1eaf8593e78f73885c1dfac27ad83bee23bdc5
+F src/pager.c 9d4d6406512002d9a243ec27b9c01e93fda43e36
+F src/pager.h 8b8c9bc065a3c66769df8724dfdf492ee1aab3c5
 F src/parse.y f29df90bd3adc64b33114ab1de9fb7768fcf2099
 F src/pcache.c f8043b433a57aba85384a531e3937a804432a346
 F src/pcache.h 1b5dcc3dc8103d03e625b177023ee67764fa6b7c
@@ -199,7 +199,7 @@ F src/test9.c bea1e8cf52aa93695487badedd6e1886c321ea60
 F src/test_async.c 0612a752896fad42d55c3999a5122af10dcf22ad
 F src/test_autoext.c 30e7bd98ab6d70a62bb9ba572e4c7df347fe645e
 F src/test_backup.c c129c91127e9b46e335715ae2e75756e25ba27de
-F src/test_btree.c 47cd771250f09cdc6e12dda5bc71bc0b3abc96e2
+F src/test_btree.c 5b89601dcb42a33ba8b820a6b763cc9cb48bac16
 F src/test_config.c d2da9f1490c38d9b9cb52f399b6adb81d538273a
 F src/test_demovfs.c 20a4975127993f4959890016ae9ce5535a880094
 F src/test_devsym.c e7498904e72ba7491d142d5c83b476c4e76993bc
@@ -239,7 +239,7 @@ F src/update.c d3076782c887c10e882996550345da9c4c9f9dea
 F src/utf.c 890c67dcfcc7a74623c95baac7535aadfe265e84
 F src/util.c 4f6cfad661b2e3454b0cdd5b1b9d39a54942d0e3
 F src/vacuum.c bfd53f9bd20a8fdb70b0fa8e77182b866875c0d8
-F src/vdbe.c e1d26b98288889c22f00cf4851ec351ee67ad8b9
+F src/vdbe.c b6cb2ac43263843a5612892c0ad2309609b32c26
 F src/vdbe.h 18f581cac1f4339ec3299f3e0cc6e11aec654cdb
 F src/vdbeInt.h 6ff4180a05683566a8835d12f7ec504b22932c82
 F src/vdbeapi.c 3662b6a468a2a4605a15dfab313baa6dff81ad91
@@ -689,7 +689,7 @@ F test/selectA.test 06d1032fa9009314c95394f2ca2e60d9f7ae8532
 F test/selectB.test 954e4e49cf1f896d61794e440669e03a27ceea25
 F test/selectC.test 871fb55d884d3de5943c4057ebd22c2459e71977
 F test/server1.test 46803bd3fe8b99b30dbc5ff38ffc756f5c13a118
-F test/shared.test 34945a516532b11182c3eb26e31247eee3c9ae48
+F test/shared.test 930104c2a6c173a8e21a850163c9e0475846a127
 F test/shared2.test 03eb4a8d372e290107d34b6ce1809919a698e879
 F test/shared3.test ebf77f023f4bdaa8f74f65822b559e86ce5c6257
 F test/shared4.test 72d90821e8d2fc918a08f16d32880868d8ee8e9d
@@ -1004,7 +1004,7 @@ F tool/tostr.awk e75472c2f98dd76e06b8c9c1367f4ab07e122d06
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
 F tool/warnings-clang.sh a8a0a3babda96dfb1ff51adda3cbbf3dfb7266c2
 F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
-P 6d326d44fd1d626aae0e8456e5fa2049f1ce0789 e71495a817b479bc23c5403d99255e3f098eb054
-R 721b18aaca6e897933f70f12a0639abb
-U dan
-Z ae28fe2fc4311d40e0d8bc0f1e62fc1e
+P 25ba1f84f2b98d50ac1e2b9849b59ee902c2cca7 595dfdbffefb2598cba89980f885289d1c5f5833
+R 5e75bcca6ded2fde27198872e2249f50
+U drh
+Z 8ecdf8c27648824577a4fdb2f7f5e787
diff --git a/manifest.uuid b/manifest.uuid
index fb247993c..48122fc73 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-25ba1f84f2b98d50ac1e2b9849b59ee902c2cca7
\ No newline at end of file
+e72179f3a43e4df36b7c2955eaacce6c804272c6
\ No newline at end of file
diff --git a/src/btree.c b/src/btree.c
index 287652692..58a9dce1e 100644
--- a/src/btree.c
+++ b/src/btree.c
@@ -1757,7 +1757,7 @@ int sqlite3BtreeOpen(
   ** If this Btree is a candidate for shared cache, try to find an
   ** existing BtShared object that we can share with
   */
-  if( isMemdb==0 && isTempDb==0 ){
+  if( isTempDb==0 && (isMemdb==0 || (vfsFlags&SQLITE_OPEN_URI)!=0) ){
     if( vfsFlags & SQLITE_OPEN_SHAREDCACHE ){
       int nFullPathname = pVfs->mxPathname+1;
       char *zFullPathname = sqlite3Malloc(nFullPathname);
@@ -1767,11 +1767,16 @@ int sqlite3BtreeOpen(
         sqlite3_free(p);
         return SQLITE_NOMEM;
       }
-      rc = sqlite3OsFullPathname(pVfs, zFilename, nFullPathname, zFullPathname);
-      if( rc ){
-        sqlite3_free(zFullPathname);
-        sqlite3_free(p);
-        return rc;
+      if( isMemdb ){
+        memcpy(zFullPathname, zFilename, sqlite3Strlen30(zFilename)+1);
+      }else{
+        rc = sqlite3OsFullPathname(pVfs, zFilename,
+                                   nFullPathname, zFullPathname);
+        if( rc ){
+          sqlite3_free(zFullPathname);
+          sqlite3_free(p);
+          return rc;
+        }
       }
 #if SQLITE_THREADSAFE
       mutexOpen = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_OPEN);
@@ -1781,7 +1786,7 @@ int sqlite3BtreeOpen(
 #endif
       for(pBt=GLOBAL(BtShared*,sqlite3SharedCacheList); pBt; pBt=pBt->pNext){
         assert( pBt->nRef>0 );
-        if( 0==strcmp(zFullPathname, sqlite3PagerFilename(pBt->pPager))
+        if( 0==strcmp(zFullPathname, sqlite3PagerFilename(pBt->pPager, 0))
                  && sqlite3PagerVfs(pBt->pPager)==pVfs ){
           int iDb;
           for(iDb=db->nDb-1; iDb>=0; iDb--){
@@ -8046,14 +8051,15 @@ char *sqlite3BtreeIntegrityCheck(
 #endif /* SQLITE_OMIT_INTEGRITY_CHECK */
 
 /*
-** Return the full pathname of the underlying database file.
+** Return the full pathname of the underlying database file.  Return
+** an empty string if the database is in-memory or a TEMP database.
 **
 ** The pager filename is invariant as long as the pager is
 ** open so it is safe to access without the BtShared mutex.
 */
 const char *sqlite3BtreeGetFilename(Btree *p){
   assert( p->pBt->pPager!=0 );
-  return sqlite3PagerFilename(p->pBt->pPager);
+  return sqlite3PagerFilename(p->pBt->pPager, 1);
 }
 
 /*
diff --git a/src/main.c b/src/main.c
index d148b4b42..c8fda4787 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2055,6 +2055,7 @@ int sqlite3ParseUri(
     memcpy(zFile, zUri, nUri);
     zFile[nUri] = '\0';
     zFile[nUri+1] = '\0';
+    flags &= ~SQLITE_OPEN_URI;
   }
 
   *ppVfs = sqlite3_vfs_find(zVfs);
diff --git a/src/pager.c b/src/pager.c
index b93e0aa86..425fb78ce 100644
--- a/src/pager.c
+++ b/src/pager.c
@@ -4360,7 +4360,12 @@ int sqlite3PagerOpen(
 #ifndef SQLITE_OMIT_MEMORYDB
   if( flags & PAGER_MEMORY ){
     memDb = 1;
-    zFilename = 0;
+    if( zFilename && zFilename[0] ){
+      zPathname = sqlite3DbStrDup(0, zFilename);
+      if( zPathname==0  ) return SQLITE_NOMEM;
+      nPathname = sqlite3Strlen30(zPathname);
+      zFilename = 0;
+    }
   }
 #endif
 
@@ -6296,9 +6301,16 @@ int sqlite3PagerSavepoint(Pager *pPager, int op, int iSavepoint){
 
 /*
 ** Return the full pathname of the database file.
+**
+** Except, if the pager is in-memory only, then return an empty string if
+** nullIfMemDb is true.  This routine is called with nullIfMemDb==1 when
+** used to report the filename to the user, for compatibility with legacy
+** behavior.  But when the Btree needs to know the filename for matching to
+** shared cache, it uses nullIfMemDb==0 so that in-memory databases can
+** participate in shared-cache.
 */
-const char *sqlite3PagerFilename(Pager *pPager){
-  return pPager->zFilename;
+const char *sqlite3PagerFilename(Pager *pPager, int nullIfMemDb){
+  return (nullIfMemDb && pPager->memDb) ? "" : pPager->zFilename;
 }
 
 /*
diff --git a/src/pager.h b/src/pager.h
index eca8a2f07..2b60e058d 100644
--- a/src/pager.h
+++ b/src/pager.h
@@ -151,7 +151,7 @@ int sqlite3PagerCloseWal(Pager *pPager);
 u8 sqlite3PagerIsreadonly(Pager*);
 int sqlite3PagerRefcount(Pager*);
 int sqlite3PagerMemUsed(Pager*);
-const char *sqlite3PagerFilename(Pager*);
+const char *sqlite3PagerFilename(Pager*, int);
 const sqlite3_vfs *sqlite3PagerVfs(Pager*);
 sqlite3_file *sqlite3PagerFile(Pager*);
 const char *sqlite3PagerJournalname(Pager*);
diff --git a/src/test_btree.c b/src/test_btree.c
index 0048397e9..db72889b2 100644
--- a/src/test_btree.c
+++ b/src/test_btree.c
@@ -33,7 +33,7 @@ int sqlite3BtreeSharedCacheReport(
   BtShared *pBt;
   Tcl_Obj *pRet = Tcl_NewObj();
   for(pBt=GLOBAL(BtShared*,sqlite3SharedCacheList); pBt; pBt=pBt->pNext){
-    const char *zFile = sqlite3PagerFilename(pBt->pPager);
+    const char *zFile = sqlite3PagerFilename(pBt->pPager, 1);
     Tcl_ListObjAppendElement(interp, pRet, Tcl_NewStringObj(zFile, -1));
     Tcl_ListObjAppendElement(interp, pRet, Tcl_NewIntObj(pBt->nRef));
   }
diff --git a/src/vdbe.c b/src/vdbe.c
index fa5180c9a..ec4ea2a55 100644
--- a/src/vdbe.c
+++ b/src/vdbe.c
@@ -5511,7 +5511,7 @@ case OP_JournalMode: {    /* out2-prerelease */
   if( !sqlite3PagerOkToChangeJournalMode(pPager) ) eNew = eOld;
 
 #ifndef SQLITE_OMIT_WAL
-  zFilename = sqlite3PagerFilename(pPager);
+  zFilename = sqlite3PagerFilename(pPager, 1);
 
   /* Do not allow a transition to journal_mode=WAL for a database
   ** in temporary storage or if the VFS does not support shared memory 
diff --git a/test/shared.test b/test/shared.test
index 37564e696..0c5c408b3 100644
--- a/test/shared.test
+++ b/test/shared.test
@@ -1056,7 +1056,47 @@ do_test shared-$av-15.2 {
 db close
 db2 close
 
-}
+# Shared cache on a :memory: database.  This only works for URI filenames.
+#
+do_test shared-$av-16.1 {
+  sqlite3 db1 file::memory: -uri 1
+  sqlite3 db2 file::memory: -uri 1
+  db1 eval {
+    CREATE TABLE t1(x); INSERT INTO t1 VALUES(1),(2),(3);
+  }
+  db2 eval {
+    SELECT x FROM t1 ORDER BY x;
+  }
+} {1 2 3}
+do_test shared-$av-16.2 {
+  db2 eval {
+    INSERT INTO t1 VALUES(99);
+    DELETE FROM t1 WHERE x=2;
+  }
+  db1 eval {
+    SELECT x FROM t1 ORDER BY x;
+  }
+} {1 3 99}
+
+# Verify that there is no cache sharing ordinary (non-URI) filenames are
+# used.
+#
+do_test shared-$av-16.3 {
+  db1 close
+  db2 close
+  sqlite3 db1 :memory:
+  sqlite3 db2 :memory:
+  db1 eval {
+    CREATE TABLE t1(x); INSERT INTO t1 VALUES(4),(5),(6);
+  }
+  catchsql {
+    SELECT * FROM t1;
+  } db2
+} {1 {no such table: t1}}
+db1 close
+db2 close
+
+}  ;# end of autovacuum on/off loop
 
 sqlite3_enable_shared_cache $::enable_shared_cache
 finish_test