bk commit into 5.1 tree (gni:1.2441) BUG#25743

[gni]

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ChangeSet@stripped, 2007-03-08 17:47:13+08:00, gni@stripped +1 -0
  BUG#25743 If undo_buffer_size (for LG) greater than the inital shared memory (default 20M), 
            ndbd nodes are crashed

  storage/ndb/src/kernel/vm/Pool.hpp@stripped, 2007-03-08 17:47:11+08:00, gni@stripped +5 -2
    Only when m_pool.seize() return true, the ptr.i and ptr.p is assigned the right value, 
    or else the parameter ptr should be "not touched".

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	gni
# Host:	dev3-221.dev.cn.tlan
# Root:	/home/ngb/mysql/mysql-5.1/mysql-5.1-bug25743

--- 1.11/storage/ndb/src/kernel/vm/Pool.hpp	2007-03-08 17:47:20 +08:00
+++ 1.12/storage/ndb/src/kernel/vm/Pool.hpp	2007-03-08 17:47:20 +08:00
@@ -307,8 +307,11 @@
 {
   Ptr<void> tmp;
   bool ret = m_pool.seize(tmp);
-  ptr.i = tmp.i;
-  ptr.p = static_cast<T*>(tmp.p);
+  if(likely(ret))
+  {
+    ptr.i = tmp.i;
+    ptr.p = static_cast<T*>(tmp.p);
+  }
   return ret;
 }