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----------------------------------------------------------
revno: 2630.4.35
committer: Konstantin Osipov <konstantin@mysql.com>
branch nick: mysql-6.0-3726
timestamp: Wed 2008-06-25 16:44:00 +0400
message:
  Fix a MyISAM-specific bug in the new implementation of
  LOCK TABLES (WL#3726).
  If more than one instance of a MyISAM table are open in the
  same connection, all of them must share the same status_param.
  Otherwise, unlock of a table may lead to lost records.
  See also comments in thr_lock.c.

include/thr_lock.h:
   Declare thr_lock_merge_status().
mysql-test/r/lock.result:
  Update test results (WL#3726).
mysql-test/t/lock.test:
  Add a test case for the situation when the same table is locked
  twice by LOCK TABLES, and only one instance is updated.
mysys/thr_lock.c:
  Move the code that makes sure all status_params of the same
  table are shared into a separate function.
sql/lock.cc:
  Make sure that status_param is shared when a table is reopened.
This commit is contained in:
Konstantin Osipov
2009-12-02 23:47:23 +03:00
parent 124cda8a0a
commit 77cbfd85ee
5 changed files with 76 additions and 6 deletions
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include/thr_lock.h
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@@ -160,6 +160,8 @@ void thr_unlock(THR_LOCK_DATA *data);
enum enum_thr_lock_result thr_multi_lock(THR_LOCK_DATA **data,
uint count, THR_LOCK_OWNER *owner);
void thr_multi_unlock(THR_LOCK_DATA **data,uint count);
void
thr_lock_merge_status(THR_LOCK_DATA **data, uint count);
void thr_abort_locks(THR_LOCK *lock, my_bool upgrade_lock);
my_bool thr_abort_locks_for_thread(THR_LOCK *lock, my_thread_id thread);
void thr_print_locks(void); /* For debugging */