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Merge with 4.0.20

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BitKeeper/etc/logging_ok:
  auto-union
client/mysql.cc:
  Auto merged
client/mysqltest.c:
  Auto merged
innobase/btr/btr0btr.c:
  Auto merged
innobase/dict/dict0dict.c:
  Auto merged
innobase/dict/dict0load.c:
  Auto merged
innobase/eval/eval0eval.c:
  Auto merged
innobase/ibuf/ibuf0ibuf.c:
  Auto merged
innobase/include/ut0mem.h:
  Auto merged
innobase/lock/lock0lock.c:
  Auto merged
innobase/row/row0ins.c:
  Auto merged
innobase/row/row0mysql.c:
  Auto merged
innobase/row/row0sel.c:
  Auto merged
innobase/row/row0umod.c:
  Auto merged
innobase/row/row0upd.c:
  Auto merged
innobase/trx/trx0trx.c:
  Auto merged
innobase/ut/ut0dbg.c:
  Auto merged
innobase/ut/ut0mem.c:
  Auto merged
myisam/mi_dynrec.c:
  Auto merged
mysql-test/r/innodb.result:
  Auto merged
mysql-test/t/fulltext.test:
  Auto merged
mysql-test/t/rpl_rotate_logs.test:
  Auto merged
scripts/make_binary_distribution.sh:
  Auto merged
sql/ha_innodb.cc:
  Auto merged
sql/item_func.cc:
  Auto merged
sql/slave.cc:
  Auto merged
sql/sql_class.h:
  Auto merged
sql/sql_show.cc:
  Auto merged
innobase/os/os0file.c:
  Merge with 4.0.20
  Ensure that we call F_UNLCK for files on which we call F_WRLCK.
  This is to ensure that this code will be portable accross most platforms.
myisam/ft_boolean_search.c:
  Merge with 4.0.20 (keep original file)
myisam/ft_parser.c:
  Merge with 4.0.20 (keep original file)
myisam/ftdefs.h:
  Merge with 4.0.20 (keep original file)
This commit is contained in:
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2004-05-17 01:52:13 +03:00
parent 8ef62cc1ef fa163d0ba5
commit a495f76c8e
40 changed files with 287 additions and 99 deletions
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19
sql/sql_class.h
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@ -598,7 +598,24 @@ public:
struct rand_struct rand; // used for authentication
struct system_variables variables; // Changeable local variables
pthread_mutex_t LOCK_delete; // Locked before thd is deleted
/*
Note that (A) if we set query = NULL, we must at the same time set
query_length = 0, and protect the whole operation with the
LOCK_thread_count mutex. And (B) we are ONLY allowed to set query to a
non-NULL value if its previous value is NULL. We do not need to protect
operation (B) with any mutex. To avoid crashes in races, if we do not
know that thd->query cannot change at the moment, one should print
thd->query like this:
(1) reserve the LOCK_thread_count mutex;
(2) check if thd->query is NULL;
(3) if not NULL, then print at most thd->query_length characters from
it. We will see the query_length field as either 0, or the right value
for it.
Assuming that the write and read of an n-bit memory field in an n-bit
computer is atomic, we can avoid races in the above way.
This printing is needed at least in SHOW PROCESSLIST and SHOW INNODB
STATUS.
*/
/* all prepared statements and cursors of this connection */
Statement_map stmt_map;
/*