Bug#21413
"Engine table handler used by multiple threads in REPLACE DELAYED"
When executing a REPLACE DELAYED statement, the storage engine
::extra() method was invoked by a different thread than the thread
which has acquired the handler instance.

This did not cause problems within the current server and with
the current storage engines.
But it has the potential to confuse future storage engines.

Added code to avoid surplus calls to extra() method in case of DELAYED
which avoids calling storage engine from a different thread than
expected.

No test case.
This change does not change behavior in conjunction with current
storage engines. So it cannot be tested by the regression test suite.

into  ramayana.hindu.god:/home/tsmith/m/bk/maint/41

into  mysql.com:/misc/mysql/31752_/41-31752_

fix test program

into  mysql.com:/misc/mysql/31752_/41-31752_

into  mysql.com:/home/gluh/MySQL/Merge/4.1-opt

into  ramayana.hindu.god:/home/tsmith/m/bk/maint/41

into  pippilotta.erinye.com:/shared/home/df/mysql/build/mysql-4.1-build

post-fixes: prevent semi-related overflow, additional comments

into  ramayana.hindu.god:/home/tsmith/m/bk/maint/41

into  mysql.com:/misc/mysql/32707/41-32707

into  mysql.com:/home/hf/work/mrg/my41-mrg

into  four.local.lan:/work/trees/mysql-4.1-build-src-clean

into  mysql.com:/home/hf/work/mrg/my41-mrg

   Bug#31030 rpl000015.test fails if $MYSQL_TCP_PORT != 3306
Note:
  This bug does not occur in MySQL 5.0 and up, because
  ChangeSet 1.2328.2.1 2006/11/27 for MySQL 5.0 prevents this.
  The 5.0 fix uses the environment variable DEFAULT_MASTER_PORT
  which is set by mysql-test-run.pl.
  mysql-test-run.pl in 4.1 does not set this variable.
  There are two alternatives:
  1) Backport the 5.0 fix for this test including modifications
     to mysql-test-run.pl and mysql-test-run-shell.
     This is a not acceptable impact on an old MySQL version.
  2) Fix the problem different than in 5.0 like in the current
     ChangeSet + do not apply these changes when upmerging to 5.0

  Added 64 bit Mac OS X hard coded settings, for universal binaries

  Added 64 bit Mac OS X hard coded settings, for universal binaries

Denormalized DOUBLE-s can't be properly handled by old MIPS processors.
So we need to enable specific mode for them so IRIX will do use
software round to handle such numbers. 

Miscalculation in protocol-layer: size buffer correctly so
even really long error messages cannot overflow our buffer.

comment fixed as we truly need const_item to be 1 to mark
constant function

strmake() calls are easy to get wrong. Add checks in extra
debug mode to identify possible exploits.

Remove some dead code.

Remove some off-by-one errors identified with new checks.

into  mysql.com:/home/hf/work/30284/my41-30284

into  stella.local:/home2/mydev/mysql-4.1-axmrg

into  mysql.com:/home/hf/work/31868/my41-31868

SPATIAL key is fine actually, but the chk_key() function
mistakenly returns error. It tries to compare checksums
of btree and SPATIAL keys while the checksum for the SPATIAL isn't
calculated (always 0). Same thing with FULLTEXT keys is handled
using full_text_keys counter, so fixed by counting both
SPATIAL and FULLTEXT keys in that counter.

into  mysql.com:/home/hf/work/31158/my41-31158

into  stella.local:/home2/mydev/mysql-4.1-axmrg

into  trift2.:/MySQL/M41/push-4.1

into  trift2.:/MySQL/M41/push-4.1

into  trift2.:/MySQL/M41/push-4.1

into  mysql.com:/home/gluh/MySQL/Merge/4.1-opt

into  mysql.com:/home/svoj/devel/mysql/BUG31277/mysql-4.1-engines

into  mysql.com:/home/svoj/devel/mysql/BUG31277/mysql-4.1-engines

into  mysql.com:/home/hf/work/31305/my41-31305

max_length parameter for BLOB-returning functions must be big enough
for any possible content. Otherwise the field created for a table
will be too small.

into  mysql.com:/home/kent/bk/bug30069/mysql-4.1-build

  Use proper variable for test.

into  mysql.com:/home/svoj/devel/mysql/BUG32111/mysql-4.0