If the sqlite3_wal_checkpoint() API is passed a NULL pointer in place of a database name, attempt to checkpoint all attached databases.

FossilOrigin-Name: 27a5c09ce8a35039d844d08cfe5698e8b438abfe

manifest

@@ -1,8 +1,5 @@
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-C Make\ssure\sthe\smutex\sis\sheld\swhile\scalling\ssqlite3ApiExit()\sin\s\nsqlite3_wal_checkpoint().\s\sOther\scleanup\sof\sWAL\slogic.
-D 2010-05-03T13:37:30
+C If\sthe\ssqlite3_wal_checkpoint()\sAPI\sis\spassed\sa\sNULL\spointer\sin\splace\sof\sa\sdatabase\sname,\sattempt\sto\scheckpoint\sall\sattached\sdatabases.
+D 2010-05-03T14:05:43
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@@ -134,7 +131,7 @@ F src/journal.c b0ea6b70b532961118ab70301c00a33089f9315c
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 F src/loadext.c 1c7a61ce1281041f437333f366a96aa0d29bb581
-F src/main.c 0f66a2b0c2ce2c44ab4a5436e05064d39d8f5cbf
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 F src/mem1.c 89d4ea8d5cdd55635cbaa48ad53132af6294cbb2
@@ -811,14 +808,7 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
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manifest.uuid

@@ -1 +1 @@
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+27a5c09ce8a35039d844d08cfe5698e8b438abfe

src/main.c

@@ -1260,7 +1260,7 @@ int sqlite3_wal_checkpoint(sqlite3 *db, const char *zDb){
   return SQLITE_OK;
 #else
   int rc;                         /* Return code */
-  int iDb = 0;                    /* sqlite3.aDb[] index of db to checkpoint */
+  int iDb = SQLITE_MAX_ATTACHED;  /* sqlite3.aDb[] index of db to checkpoint */
 
   sqlite3_mutex_enter(db->mutex);
   if( zDb ){
@@ -1284,28 +1284,38 @@ int sqlite3_wal_checkpoint(sqlite3 *db, const char *zDb){
 ** Run a checkpoint on database iDb. This is a no-op if database iDb is
 ** not currently open in WAL mode.
 **
-** If a transaction is open at either the database handle (db) or b-tree
-** level, this function returns SQLITE_LOCKED and a checkpoint is not
-** attempted. If an error occurs while running the checkpoint, an SQLite
-** error code is returned (i.e. SQLITE_IOERR). Otherwise, SQLITE_OK.
+** If a transaction is open on the database being checkpointed, this 
+** function returns SQLITE_LOCKED and a checkpoint is not attempted. If 
+** an error occurs while running the checkpoint, an SQLite error code is 
+** returned (i.e. SQLITE_IOERR). Otherwise, SQLITE_OK.
 **
 ** The mutex on database handle db should be held by the caller. The mutex
 ** associated with the specific b-tree being checkpointed is taken by
 ** this function while the checkpoint is running.
+**
+** If iDb is passed SQLITE_MAX_ATTACHED, then all attached databases are
+** checkpointed. If an error is encountered it is returned immediately -
+** no attempt is made to checkpoint any remaining databases.
 */
 int sqlite3Checkpoint(sqlite3 *db, int iDb){
-  Btree *pBt;                     /* Btree handle to checkpoint */
-  int rc;                         /* Return code */
+  int rc = SQLITE_OK;             /* Return code */
+  int i;                          /* Used to iterate through attached dbs */
 
   assert( sqlite3_mutex_held(db->mutex) );
 
-  pBt = db->aDb[iDb].pBt;
-  if( sqlite3BtreeIsInReadTrans(pBt) ){
-    rc = SQLITE_LOCKED;
-  }else{
-    sqlite3BtreeEnter(pBt);
-    rc = sqlite3PagerCheckpoint(sqlite3BtreePager(pBt));
-    sqlite3BtreeLeave(pBt);
+  for(i=0; i<db->nDb && rc==SQLITE_OK; i++){
+    if( i==iDb || iDb==SQLITE_MAX_ATTACHED ){
+      Btree *pBt = db->aDb[i].pBt;
+      if( pBt ){
+        if( sqlite3BtreeIsInReadTrans(pBt) ){
+          rc = SQLITE_LOCKED;
+        }else{
+          sqlite3BtreeEnter(pBt);
+          rc = sqlite3PagerCheckpoint(sqlite3BtreePager(pBt));
+          sqlite3BtreeLeave(pBt);
+        }
+      }
+    }
   }
 
   return rc;