When the Item_cond::fix_fields() function reduces cond tree, it in loop
scans it's own list and when it founds Item_cond with same function (AND
or OR) it does next things: 1) replaces that item with item's list. 2)
empties item's list. Due to this operation is done twice - for update and
for view, at the update phase cond's list of lower view is already empty.
Empty list returns ref to itself, thus making endless loop by replacing
list with itself, emptying, replacing again and so on. This results in
server hung up.

To the Item_cond::fix_fields() function added check that ensures that
list being replaced with isn't empty.

into mysql.com:/M50/mysql-5.0

database
 - Fix test case for systems with "lowercase names"

into mysql.com:/M50/mysql-5.0

into mysql.com:/home/hf/work/mysql-5.0.9088

into mysql.com:/home/hf/work/mysql-5.0.9088

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1-r1.2478

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.0-r1.2173

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-5.0

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1-r1.2478

  revise README.

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-5.0

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1-r1.2478

  Revise README.gcov.

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-5.0

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1-r1.2478

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-4.1

  Revise mysql-test README.

into mysql.com:/M40/comment-4.0

into mysql.com:/M41/comment-4.1

into  lsmy3.wdf.sap.corp:/data/users/tkatchaounov/mysql/src/5.0-bug-17523

into  shellback.(none):/home/msvensson/mysql/mysql-5.0

into  lsmy3.wdf.sap.corp:/data/users/tkatchaounov/mysql/src/5.0-dbg

into mysql.com:/M50/mysql-5.0

into  snake-hub.snake.net:/src/extern/MySQL/bk/mysql-5.0

into  mysql.com:/home/timka/mysql/src/5.0-bug-17523

into  mysql.com:/home/alexi/bugs/mysql-5.0-merged

 - Change to use non blocking read to empty channel in case of too large sd number
 - Don't check for too large socket number on Windows.

  Allocating/freeing memory for the db member of THD
  is wholy managed by slave thread.

to both the Shell and the Perl vaerion of "mysql-test-run"-

mysql-test/mysql-test-run.sh  :  Add a "--comment=<string>" option, to get it logged when the test is run.