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row0mysql.c, row0mysql.h, ha_innodb.cc:

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Inside LOCK TABLES, use either LOCK_S or LOCK_X in locking reads; an improvent over the previous patch


sql/ha_innodb.cc:
  Inside LOCK TABLES, use either LOCK_S or LOCK_X in locking reads; an improvent over the previous patch
innobase/include/row0mysql.h:
  Inside LOCK TABLES, use either LOCK_S or LOCK_X in locking reads; an improvent over the previous patch
innobase/row/row0mysql.c:
  Inside LOCK TABLES, use either LOCK_S or LOCK_X in locking reads; an improvent over the previous patch
This commit is contained in:
unknown
2004-06-01 19:19:48 +03:00
parent 80c662479b
commit 3db332ca6b
3 changed files with 35 additions and 9 deletions
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3
innobase/include/row0mysql.h
View File

@ -507,6 +507,9 @@ struct row_prebuilt_struct {
dtuple_t* clust_ref; /* prebuilt dtuple used in
sel/upd/del */
ulint select_lock_type;/* LOCK_NONE, LOCK_S, or LOCK_X */
ulint stored_select_lock_type;/* inside LOCK TABLES, either
LOCK_S or LOCK_X depending on the lock
type */
ulint mysql_row_len; /* length in bytes of a row in the
MySQL format */
ulint n_rows_fetched; /* number of rows fetched after

1
innobase/row/row0mysql.c
View File

@ -380,6 +380,7 @@ row_create_prebuilt(
prebuilt->clust_pcur = btr_pcur_create_for_mysql();
prebuilt->select_lock_type = LOCK_NONE;
prebuilt->stored_select_lock_type = 99999999;
prebuilt->sel_graph = NULL;

38
sql/ha_innodb.cc
View File

@ -4505,16 +4505,38 @@ ha_innobase::start_stmt(
prebuilt->select_lock_type = LOCK_X;
} else {
/* For other than temporary tables, we obtain
no lock for consistent read (plain SELECT), and
an exclusive lock for SELECT ... FOR UPDATE or
SELECT ... LOCK IN SHARE MODE. */
/* When we first come here after LOCK TABLES,
select_lock_type is set to LOCK_S or LOCK_X. Store the value
in case we run also consistent reads and need to restore the
value later. */
if (prebuilt->select_lock_type != LOCK_NONE) {
prebuilt->stored_select_lock_type =
prebuilt->select_lock_type;
}
if (prebuilt->stored_select_lock_type != LOCK_S
&& prebuilt->stored_select_lock_type != LOCK_X) {
fprintf(stderr,
"InnoDB: Error: select_lock_type is %lu inside ::start_stmt()!\n",
prebuilt->stored_select_lock_type);
ut_error;
}
if (thd->lex.sql_command == SQLCOM_SELECT
&& thd->lex.lock_option == TL_READ) {
/* For other than temporary tables, we obtain
no lock for consistent read (plain SELECT) */
prebuilt->select_lock_type = LOCK_NONE;
} else {
/* Not a consistent read: restore the
select_lock_type value */
prebuilt->select_lock_type =
thd->lex.sql_command == SQLCOM_SELECT
&& thd->lex.lock_option == TL_READ
? LOCK_NONE
: LOCK_X;
prebuilt->stored_select_lock_type;
}
}
/* Set the MySQL flag to mark that there is an active transaction */