bk commit into 5.0 tree (dkatz:1.2437) BUG#27322

[damien]

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5.0 repository of dkatz. When dkatz does a push these changes will
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ChangeSet@stripped, 2007-04-12 18:03:26-04:00, dkatz@stripped +3 -0
  Bug #27322  	failure to allocate transaction_prealloc_size causes crash
  
  Fix for when memory pre-allocation fails.

  mysql-test/r/variables-big.result@stripped, 2007-04-12 18:03:24-04:00,
dkatz@stripped +20 -0
    Added "big" test for bug fix Bug #27322.

  mysql-test/r/variables-big.result@stripped, 2007-04-12 18:03:24-04:00,
dkatz@stripped +0 -0

  mysql-test/t/variables-big.test@stripped, 2007-04-12 18:03:24-04:00,
dkatz@stripped +20 -0
    Added "big" test for bug fix Bug #27322.

  mysql-test/t/variables-big.test@stripped, 2007-04-12 18:03:24-04:00,
dkatz@stripped +0 -0

  mysys/my_alloc.c@stripped, 2007-04-12 18:03:24-04:00, dkatz@stripped +4
-0
    Added code to null-out the pre-alloc pointer if allocation fails. This is necessary
for the next time this procedure is called.

# 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:	dkatz
# Host:	damien-katzs-computer.local
# Root:	/Users/dkatz/50b

--- 1.34/mysys/my_alloc.c	2006-12-23 14:04:07 -05:00
+++ 1.35/mysys/my_alloc.c	2007-04-12 18:03:24 -04:00
@@ -133,6 +133,10 @@ void reset_root_defaults(MEM_ROOT *mem_r
         mem->next= *prev;
         *prev= mem_root->pre_alloc= mem; 
       }
+      else
+      {
+        mem_root->pre_alloc= 0;
+      }
     }
   }
   else
--- New file ---
+++ mysql-test/r/variables-big.result	07/04/12 18:03:24
set session transaction_prealloc_size=1024*1024*1024*1;
show processlist;
Id	User	Host	db	Command	Time	State	Info
1	root	localhost	test	Query	0	NULL	show processlist
set session transaction_prealloc_size=1024*1024*1024*2;
show processlist;
Id	User	Host	db	Command	Time	State	Info
1	root	localhost	test	Query	2	NULL	show processlist
set session transaction_prealloc_size=1024*1024*1024*3;
show processlist;
Id	User	Host	db	Command	Time	State	Info
1	root	localhost	test	Query	0	NULL	show processlist
set session transaction_prealloc_size=1024*1024*1024*4;
show processlist;
Id	User	Host	db	Command	Time	State	Info
1	root	localhost	test	Query	0	NULL	show processlist
set session transaction_prealloc_size=1024*1024*1024*5;
show processlist;
Id	User	Host	db	Command	Time	State	Info
1	root	localhost	test	Query	0	NULL	show processlist

--- New file ---
+++ mysql-test/t/variables-big.test	07/04/12 18:03:24
#
# test variables big
#

--source include/big_test.inc

#
# Bug #27322  	failure to allocate transaction_prealloc_size causes crash
#

set session transaction_prealloc_size=1024*1024*1024*1;
show processlist;
set session transaction_prealloc_size=1024*1024*1024*2;
show processlist;
set session transaction_prealloc_size=1024*1024*1024*3;
show processlist;
set session transaction_prealloc_size=1024*1024*1024*4;
show processlist;
set session transaction_prealloc_size=1024*1024*1024*5;
show processlist;