Bug #16979: AUTO_INC lock in InnoDB works a table level lock
  Add a table level counter that tracks the number of AUTOINC locks that are
  pending and/or granted on a table. We peek at this value to determine whether
  a transaction doing a simple INSERT in innodb_autoinc_lock_mode = 1, needs to
  acquire the AUTOINC lock or not. This change is related to Bug# 16979.
Bug #27950: Duplicate entry error in auto-inc after mysqld restart
  We check whether the AUTOINC sub-system has been initialized (first) by
  holding the AUTOINC mutex and if initialization is required then we
  initialize using our normal procedure.


storage/innobase/dict/dict0boot.c:
  Apply InnoDB snapshot innodb-5.1-ss1751.
storage/innobase/dict/dict0crea.c:
  Apply InnoDB snapshot innodb-5.1-ss1751.
storage/innobase/dict/dict0load.c:
  Apply InnoDB snapshot innodb-5.1-ss1751.
storage/innobase/dict/dict0mem.c:
  Apply InnoDB snapshot innodb-5.1-ss1751.
  
  Revision r1749:
  Add a table level counter that tracks the number of AUTOINC locks that are
  pending and/or granted on a table. We peek at this value to determine whether
  a transaction doing a simple INSERT in innodb_autoinc_lock_mode = 1, needs to
  acquire the AUTOINC lock or not. This change is related to Bug# 16979.
storage/innobase/handler/ha_innodb.cc:
  Apply InnoDB snapshot innodb-5.1-ss1751.
  
  Revision r1735:
  Add variable "innodb_autoinc_lock_mode"  to control the behavior of the
  AUTOINC locking. There are three modes, 0 for backward compatibility, 1 for the
  new style locking (default, safe for statement-based replication) and
  2 for no AUTOINC locking (unsafe for statement-based replication).
  
  
  Revision r1750:
  We check whether the AUTOINC sub-system has been initialized (first) by
  holding the AUTOINC mutex and if initialization is required then we
  initialize using our normal procedure. This change is related to Bug#27950.
  
  
  Revision r1746:
  Remove some code from ha_innodb.cc that was already enclosed in #if 0.
  The code was related to replication and group commit, and it was
  unreachable already as of MySQL 5.0.
  
  Approved by Heikki
  
  
  Revision r1749:
  Add a table level counter that tracks the number of AUTOINC locks that are
  pending and/or granted on a table. We peek at this value to determine whether
  a transaction doing a simple INSERT in innodb_autoinc_lock_mode = 1, needs to
  acquire the AUTOINC lock or not. This change is related to Bug# 16979.
storage/innobase/include/dict0mem.h:
  Apply InnoDB snapshot innodb-5.1-ss1751.
  
  Revision r1749:
  Add a table level counter that tracks the number of AUTOINC locks that are
  pending and/or granted on a table. We peek at this value to determine whether
  a transaction doing a simple INSERT in innodb_autoinc_lock_mode = 1, needs to
  acquire the AUTOINC lock or not. This change is related to Bug# 16979.
  
  
  
  Revision r1747:
  Correct an outdated comment about dict_table_t:col_names that should have
  been adjusted in r1719, or r1264 in branches/zip.
storage/innobase/include/mem0mem.ic:
  Apply InnoDB snapshot innodb-5.1-ss1751.
  
  Revision r1744:
  Merge r1739 from branches/zip:
  
  mem_heap_free_heap_top(): Declare the memory freed with UNIV_MEM_FREE().
  Before this change, the memory freed by mem_heap_empty() was not completely
  flagged free in UNIV_DEBUG_VALGRIND builds.  After this change, Valgrind
  will hopefully catch all errors caught by UNIV_MEM_DEBUG.
storage/innobase/include/sync0rw.ic:
  Apply InnoDB snapshot innodb-5.1-ss1751.
  
  Revision r1751:
  rw_lock_s_lock_func(): Correct a typo in a comment.
storage/innobase/include/trx0trx.h:
  Apply InnoDB snapshot innodb-5.1-ss1751.
  
  Revision r1742:
  Remove some unused fields of trx_t: mysql_master_log_file_name,
  mysql_master_log_pos, repl_wait_binlog_name, repl_wait_binlog_pos.
  
  Approved by Heikki.
storage/innobase/lock/lock0lock.c:
  Apply InnoDB snapshot innodb-5.1-ss1751.
  
  Revision r1749:
  Add a table level counter that tracks the number of AUTOINC locks that are
  pending and/or granted on a table. We peek at this value to determine whether
  a transaction doing a simple INSERT in innodb_autoinc_lock_mode = 1, needs to
  acquire the AUTOINC lock or not. This change is related to Bug# 16979.
storage/innobase/mtr/mtr0log.c:
  Apply InnoDB snapshot innodb-5.1-ss1751.
storage/innobase/pars/pars0pars.c:
  Apply InnoDB snapshot innodb-5.1-ss1751.
storage/innobase/srv/srv0srv.c:
  Apply InnoDB snapshot innodb-5.1-ss1751.
storage/innobase/trx/trx0sys.c:
  Apply InnoDB snapshot innodb-5.1-ss1751.
  
  Revision r1743:
  trx_sys_print_mysql_binlog_offset_from_page(): Enclose the definition
  in #ifdef UNIV_HOTBACKUP, to match the function declaration.
storage/innobase/trx/trx0trx.c:
  Apply InnoDB snapshot innodb-5.1-ss1751.
  
  Revision r1742:
  Remove some unused fields of trx_t: mysql_master_log_file_name,
  mysql_master_log_pos, repl_wait_binlog_name, repl_wait_binlog_pos.
  
  Approved by Heikki.