- A prerequisite cleanup patch for making KILL reliable.

The test case main.kill did not work reliably.

The following problems have been identified:

1. A kill signal could go lost if it came in, short before a
thread went reading on the client connection.

2. A kill signal could go lost if it came in, short before a
thread went waiting on a condition variable.

These problems have been solved as follows. Please see also
added code comments for more details.

1. There is no safe way to detect, when a thread enters the
blocking state of a read(2) or recv(2) system call, where it
can be interrupted by a signal. Hence it is not possible to
wait for the right moment to send a kill signal. It has been
decided, not to fix it in the code.  Instead, the test case
repeats the KILL statement until the connection terminates.

2. Before waiting on a condition variable, we register it
together with a synchronizating mutex in THD::mysys_var. After
this, we need to test THD::killed again. At some places we did
only test it in a loop condition before the registration. When
THD::killed had been set between this test and the registration,
we entered waiting without noticing the killed flag. Additional
checks ahve been introduced where required.

In addition to the above, a re-write of the main.kill test
case has been done. All sleeps have been replaced by Debug
Sync Facility synchronization. A couple of sync points have
been added to the server code.

To avoid further problems, if the test case fails in spite of
the fixes, the test case has been added to the "experimental"
list for now.

- Most of the work on this patch is authored by Ingo Struewing


mysql-test/t/kill.test:
  Re-wrote test case to use Debug Sync points instead of sleeps
sql/event_queue.cc:
  Fixed kill detection in Event_queue::cond_wait() by adding a check
  after enter_cond().
sql/lock.cc:
  Moved Debug Sync points behind enter_cond().
  Fixed comments.
sql/slave.cc:
  Fixed kill detection in start_slave_thread() by adding a check
  after enter_cond().
sql/sql_class.cc:
  Swapped order of kill and close in THD::awake().
  Added comments.
sql/sql_class.h:
  Added a comment to THD::killed.
sql/sql_parse.cc:
  Added a sync point in do_command().
sql/sql_select.cc:
  Added a sync point in JOIN::optimize().

No conflicts

No conflicts

Remove trx_t::active_trans. Split into two separate fields with distinct
responsibilities. trx_t::is_registered and trx_t::owns_prepare_mutex.
There are wrapper functions for using this fields in ha_innodb.cc. The
wrapper functions check for invariants.

Fix some formatting to conform to InnoDB guidelines.

Remove innobase_register_stmt() and innobase_register_trx_and_stmt().

Add:
trx_is_started()
trx_deregister_from_2pc()
trx_register_for_2pc()
trx_is_registered_for_2pc()
trx_owns_prepare_commit_mutex_set()
trx_has_prepare_commit_mutex()

rb://479, Approved by Jimmy Yang.

set to 128k.

sql/sp.cc:
  Added checking for stack overrun at functions
  db_load_routine/sp_find_routine.
sql/sp_head.cc:
  sp_head::execute() modified: pass constant value STACK_MIN_SIZE
  instead of 8 * STACK_MIN_SIZE  as second argument value
  in call to check_stack_overrun. Added checking for stack overrun
  at functions sp_lex_keeper::reset_lex_and_exec_core/sp_instr_stmt::execute.
sql/sql_parse.cc:
  check_stack_overrun modified: allocate buffer for error message
  at heap instead of stack.
  parse_sql modified: added call to check_stack_overrun() before
  parsing of sql statement.

The variable innodb_change_buffering_debug is only present in debug builds.
Hide it from the test, so that the test passes in both debug and non-debug.

These files were needed when InnoDB Plugin was maintained and distributed
separately from the MySQL 5.1 source tree. They have never been needed in
MySQL 5.5.

storage/innobase/mysql-test:
 Patches to the test suite.

storage/innobase/handler/mysql_addons.cc:
 Wrappers for private MySQL functions.

It is filling the error log when testing the debug version of the server.
The printout only seems to be useful when debugging a crash, not when
testing an instrumented version of the server.

Rows events were applied wrongly on the temporary table with the same name.
But rows events are generated only for base tables. As temporary
table's data never be binlogged on row mode. Normally, base table of the
same name cannot be updated if a temporary table has the same name.
But there are two cases which can generate rows events on 
the base table of same name.
      
Case1: 'CREATE TABLE ... SELECT' statement.
In mixed format, it will generate rows events if it is unsafe.
      
Case2: Drop a transactional temporary table in a transaction
       (happens only on 5.5+).
BEGIN;
DROP TEMPORARY TABLE t1;       # t1 is a InnoDB table
INSERT INTO t1 VALUES(rand()); # t1 is a MyISAM table
COMMIT;
'DROP TEMPORARY TABLE' will be put in the transaction cache and
binlogged after the rows events generated by the 'INSERT' statement.
      
After this patch, slave opens only base table when applying a rows event.

index or foreign key

Approved by Sunny Bains

Fix assorted warnings that are generated in optimized builds.
Most of it is silencing variables that are set but unused.

This patch also introduces the MY_ASSERT_UNREACHABLE macro
which helps the compiler to deduce that a certain piece of
code is unreachable.

include/my_compiler.h:
  Use GCC's __builtin_unreachable if available. It allows
  GCC to deduce the unreachability of certain code paths,
  thus avoiding warnings that, for example, accused that a
  variable could be used without being initialized (due to
  unreachable code paths).

Fix assorted compiler warnings.

include/my_pthread.h:
  Like for pthread_cond_timedwait, the abstime is constant.
mysys/my_gethwaddr.c:
  Instead of using a manual copy that introduce warnings due to
  type mismatch, copy the buffer using memcpy and use memcmp to
  check whether all bytes of the buffer are zeroed.
mysys/thr_mutex.c:
  Like for pthread_cond_timedwait, the abstime is constant.
unittest/mytap/tap.h:
  Introduce a ok() variant that does not take a format argument.
  Since ok() is tagged with a printf attribute, GCC complains if
  the fmt argument is NULL.

Declare DATA_MBMAXLEN with the same data type as DATA_MBMINLEN.

Rename buf_pool_watch, buf_pool_mutex, buf_pool_zip_mutex
to buf_pool->watch, buf_pool->mutex, buf_pool->zip_mutex
in comments. Refer to buf_pool->flush_list_mutex instead of
flush_list_mutex.

Remove obsolete declarations of buf_pool_mutex and buf_pool_zip_mutex.

No conflicts

In the fix for Bug#53916 also apply equivalent changes to CMakeLists.txt

            
For DATA_MBMINLEN(), cast the result of UNIV_EXPECT to ulint because in GCC
it returns a long causing unsigned/signed comparison warnings.

Approved by Jimmy Yang on IM.

Tag or remove unused arguments and variables.

regex/main.c:
  Use the real prototype.
sql/ha_ndbcluster.cc:
  Make conditions less ambiguous.

Ensure that fdatasync is properly declared as on Mac OS X, the
function is available but there is no prototype. Also, port a
fix for a warning from the InnoDB plugin over to the builtin. 

configure.in:
  Check that fdatasync is declared.
mysys/my_sync.c:
  Use fdatasync only if it is declared.
storage/innobase/include/ut0dbg.h:
  Port over from the plugin a fix for a warning.

Just check for all the functions that we are going to use, not a subset
of them.

Reviewed by:	Davi (via IRC)

Tag unused arguments.
      
Approved by: Marko (via IRC)

Tag unused arguments.

Approved by: Marko (via IRC)

Fix assorted compiler warnings on Mac OS X.

BUILD/SETUP.sh:
  Remove -Wctor-dtor-privacy flag to workaround a GCC bug that
  causes it to not properly detect that implicitly generated
  constructors are always public.
cmd-line-utils/readline/terminal.c:
  tgetnum and tgetflag might not take a const string argument.
mysys/my_gethostbyname.c:
  Tag unused arguments.
mysys/my_sync.c:
  Tag unused arguments.

           data dictionary confusion

On file systems with case insensitive file names, and
lower_case_table_names set to '2', the server could crash
due to a table definition cache inconsistency.  This is 
the default setting on MacOSX, but may also be set and
used on MS Windows.

The bug is caused by using two different strategies for
creating the hash key for the table definition cache, resulting
in failure to look up an entry which is present in the cache,
or failure to delete an existing entry.  One strategy was to
use the real table name (with case preserved), and the other
to use a normalized table name (i.e a lower case version).

This is manifested in two cases.  One is  during 'DROP DATABASE', 
where all known files are removed.  The removal from
the table definition cache is done via a generated list of
TABLE_LIST with keys (wrongly) created using the case preserved 
name.  The other is during CREATE TABLE, where the cache lookup
is also (wrongly) based on the case preserved name.
   
The fix was to use only the normalized table name when
creating hash keys.


sql/sql_db.cc:
  Normalize table name (i.e lower case it)
sql/sql_table.cc:
  table_name contains the normalized name
  alias contains the real table name

No conflicts

No conflicts

           (variables_debug fails)

The problem was that "SET GLOBAL debug" could cause a crash on Solaris.
The crash happened if the server failed to open the trace file given in 
the "SET GLOBAL debug" statement. This caused an error message to be
printed to stderr containing the process name. However, printing to
stderr crashed the server since the pointer to the process name had
not been initialized.

This patch fixes the problem by initializing the process name 
properly when doing "SET GLOBAL debug".

No test case added as this bug was repeatable with existing test
coverage in variables_debug.test.