From 1a86f50d85bdce2d8e766ba2f45a458b9952661b Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Tue, 5 Apr 2011 19:27:41 +0000
Subject: [PATCH] Simplifications to the sqlite3BtreeEnterAll() and LeaveAll()
 routines. Just have them call BtreeEnter and BtreeLeave() repeatedly rather
 than trying to be clever.

FossilOrigin-Name: 51039b3578f948c23a810d176e81fa51a278fb28
---
 manifest      | 12 ++++++------
 manifest.uuid |  2 +-
 src/btmutex.c | 31 +++----------------------------
 3 files changed, 10 insertions(+), 35 deletions(-)

diff --git a/manifest b/manifest
index e1a02097f3..949247b639 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Simplifications\sto\sthe\ssqlite3ResetInternalSchema()\slogic\sto\seliminate\nunreachable\sbranches.
-D 2011-04-05T19:26:30.895
+C Simplifications\sto\sthe\ssqlite3BtreeEnterAll()\sand\sLeaveAll()\sroutines.\nJust\shave\sthem\scall\sBtreeEnter\sand\sBtreeLeave()\srepeatedly\srather\sthan\ntrying\sto\sbe\sclever.
+D 2011-04-05T19:27:41.740
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 7a4d9524721d40ef9ee26f93f9bd6a51dba106f2
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -120,7 +120,7 @@ F src/attach.c 7cae2cf0c14762ce14c074a860ec52890a973a56
 F src/auth.c 523da7fb4979469955d822ff9298352d6b31de34
 F src/backup.c b7529a6691f0fd534ae8ff622203c46a7f1b626b
 F src/bitvec.c af50f1c8c0ff54d6bdb7a80e2fceca5a93670bef
-F src/btmutex.c 1f951523accdfa1d204b06150e016b5b69529b8a
+F src/btmutex.c 7907af20b954a8605766fbd2d87b47647422960e
 F src/btree.c 107723ed4f9bdb55213ba6164c30c49af75f4bf9
 F src/btree.h 221e186cd64127088890a878aaab154344380fe8
 F src/btreeInt.h b5e339df994d12bcd9067d04f9125c8792de51ac
@@ -926,7 +926,7 @@ F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/split-sqlite3c.tcl d9be87f1c340285a3e081eb19b4a247981ed290c
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
-P a89f24e2c9591d09cbe329895ceec87885059184
-R 4633b95d671699f85d5e19626e085a29
+P a4c3ac989d4e93f0279172901b9ece822d137700
+R b358e3039856b3a4cedf9c746c6172be
 U drh
-Z a7a8333914941d20132af834f7ba9e5c
+Z 63f8b79eae39a68f25008b0134502554
diff --git a/manifest.uuid b/manifest.uuid
index eaf1aefc85..811f3eeeb6 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-a4c3ac989d4e93f0279172901b9ece822d137700
\ No newline at end of file
+51039b3578f948c23a810d176e81fa51a278fb28
\ No newline at end of file
diff --git a/src/btmutex.c b/src/btmutex.c
index 1de9db07e7..ffe124fdd6 100644
--- a/src/btmutex.c
+++ b/src/btmutex.c
@@ -186,30 +186,11 @@ void sqlite3BtreeLeaveCursor(BtCursor *pCur){
 */
 void sqlite3BtreeEnterAll(sqlite3 *db){
   int i;
-  Btree *p, *pLater;
+  Btree *p;
   assert( sqlite3_mutex_held(db->mutex) );
   for(i=0; i<db->nDb; i++){
     p = db->aDb[i].pBt;
-    assert( !p || (p->locked==0 && p->sharable) || p->pBt->db==p->db );
-    if( p && p->sharable ){
-      p->wantToLock++;
-      if( !p->locked ){
-        assert( p->wantToLock==1 );
-        while( p->pPrev ) p = p->pPrev;
-        /* Reason for ALWAYS:  There must be at least one unlocked Btree in
-        ** the chain.  Otherwise the !p->locked test above would have failed */
-        while( p->locked && ALWAYS(p->pNext) ) p = p->pNext;
-        for(pLater = p->pNext; pLater; pLater=pLater->pNext){
-          if( pLater->locked ){
-            unlockBtreeMutex(pLater);
-          }
-        }
-        while( p ){
-          lockBtreeMutex(p);
-          p = p->pNext;
-        }
-      }
-    }
+    if( p ) sqlite3BtreeEnter(p);
   }
 }
 void sqlite3BtreeLeaveAll(sqlite3 *db){
@@ -218,13 +199,7 @@ void sqlite3BtreeLeaveAll(sqlite3 *db){
   assert( sqlite3_mutex_held(db->mutex) );
   for(i=0; i<db->nDb; i++){
     p = db->aDb[i].pBt;
-    if( p && p->sharable ){
-      assert( p->wantToLock>0 );
-      p->wantToLock--;
-      if( p->wantToLock==0 ){
-        unlockBtreeMutex(p);
-      }
-    }
+    if( p ) sqlite3BtreeLeave(p);
   }
 }
 
-- 
2.39.5