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ha_innodb.h, ha_innodb.cc, handler.h, handler.cc, sql_class.cc:

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Fix a hang on the adaptive hash S-latch if an application program uses mysql_use_result() and performs queries on two connections at the same time


sql/sql_class.cc:
  Fix a hang on the adaptive hash S-latch if an application program uses mysql_use_result() and performs queries on two connections at the same time
sql/handler.cc:
  Fix a hang on the adaptive hash S-latch if an application program uses mysql_use_result() and performs queries on two connections at the same time
sql/handler.h:
  Fix a hang on the adaptive hash S-latch if an application program uses mysql_use_result() and performs queries on two connections at the same time
sql/ha_innodb.cc:
  Fix a hang on the adaptive hash S-latch if an application program uses mysql_use_result() and performs queries on two connections at the same time
sql/ha_innodb.h:
  Fix a hang on the adaptive hash S-latch if an application program uses mysql_use_result() and performs queries on two connections at the same time
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unknown
2003-03-03 19:31:01 +02:00
parent 9ca8f13734
commit e70b22e55c
5 changed files with 61 additions and 0 deletions
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30
sql/handler.cc
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@@ -238,8 +238,10 @@ int ha_autocommit_or_rollback(THD *thd, int error)
handler must be the same as in the binlog.
arguments:
thd: the thread handle of the current connection
log_file_name: latest binlog file name
end_offset: the offset in the binlog file up to which we wrote
return value: 0 if success, 1 if error
*/
int ha_report_binlog_offset_and_commit(THD *thd,
@@ -266,6 +268,34 @@ int ha_report_binlog_offset_and_commit(THD *thd,
return error;
}
/*
This function should be called when MySQL sends rows of a SELECT result set
or the EOF mark to the client. It releases a possible adaptive hash index
S-latch held by thd in InnoDB and also releases a possible InnoDB query
FIFO ticket to enter InnoDB. To save CPU time, InnoDB allows a thd to
keep them over several calls of the InnoDB handler interface when a join
is executed. But when we let the control to pass to the client they have
to be released because if the application program uses mysql_use_result(),
it may deadlock on the S-latch if the application on another connection
performs another SQL query. In MySQL-4.1 this is even more important because
there a connection can have several SELECT queries open at the same time.
arguments:
thd: the thread handle of the current connection
return value: always 0
*/
int ha_release_temporary_latches(THD *thd)
{
#ifdef HAVE_INNOBASE_DB
THD_TRANS *trans;
trans = &thd->transaction.all;
if (trans->innobase_tid)
innobase_release_temporary_latches(trans->innobase_tid);
#endif
return 0;
}
int ha_commit_trans(THD *thd, THD_TRANS* trans)
{
int error=0;