Fixed test failure under heavy load, in case truncate table is slow.

into  weblab.(none):/home/marcsql/TREE/mysql-5.1-rt50-merge

into  weblab.(none):/home/marcsql/TREE/mysql-5.0-rt-merge

into  weblab.(none):/home/marcsql/TREE/mysql-5.1-rt50-merge

into  adventure.(none):/home/thek/Development/cpp/mysql-5.1-runtime

into  adventure.(none):/home/thek/Development/cpp/mysql-5.1-runtime

into  station.:/mnt/raid/alik/MySQL/5.1-rt-build

into  adventure.(none):/home/thek/Development/cpp/mysql-5.0-runtime

into  adventure.(none):/home/thek/Development/cpp/bug21074/my51-bug21074

statement.

c++config.h now has the following code:
// For example, <windows.h> is known to #define min and max as macros...
#undef min
#undef max

So, our defines in my_global.h are undefined when <new> header
is included.

Move definitions of min()/max() to the end of my_global.h.

into  adventure.(none):/home/thek/Development/cpp/mysql-5.1-runtime

into  adventure.(none):/home/thek/Development/cpp/mysql-5.0-runtime

into  adventure.(none):/home/thek/Development/cpp/mysql-5.0-runtime

into  adventure.(none):/home/thek/Development/cpp/bug21074/my51-bug21074

Invaldating a subset of a sufficiently large query cache can take a long time.
During this time the server is efficiently frozen and no other operation can
be executed. This patch addresses this problem by setting a time limit on
how long time a dictionary access request can take before giving up on the 
attempt. This patch does not work for query cache invalidations issued by
DROP, ALTER or RENAME TABLE operations.

into  pilot.(none):/data/msvensson/mysql/mysql-5.1-new-maint

into  pilot.(none):/data/msvensson/mysql/mysql-5.1-new-maint

into  pilot.(none):/data/msvensson/mysql/mysql-5.0-maint

into  weblab.(none):/home/marcsql/TREE/mysql-5.1-30712

into  ibm.opbmk:/home/alik/Documents/MySQL/devel/5.1-rt-bug25843

of statement breaks binlog.

There were two problems discovered by this bug:

  1. Default (current) database is not fixed at the creation time.
     That leads to wrong output of DATABASE() function.

  2. Database attributes (@@collation_database) are not fixed at
     the creation time. That leads to wrong resultset.

Binlog breakage and Query Cache wrong output happened because of
the first problem.

The fix is to remember the current database at the PREPARE-time and
set it each time at EXECUTE.

into  weblab.(none):/home/marcsql/TREE/mysql-5.1-cleanup

into  bodhi.(none):/opt/local/work/mysql-5.1-12713-new

API instead.
This is a pre-requisite of the fix for Bug 12713, which changes the
data type of thd->ha_data from void * to struct Ha_data.

Fix name of function in warning message.

into  weblab.(none):/home/marcsql/TREE/mysql-5.0-runtime

into  weblab.(none):/home/marcsql/TREE/mysql-5.1-rt50-merge

into  ramayana.hindu.god:/home/tsmith/m/bk/maint/51

into  ramayana.hindu.god:/home/tsmith/m/bk/maint/51