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Kirill Smelkov
mariadb
Commits
d3858fb6
Commit
d3858fb6
authored
Dec 22, 2006
by
sunny
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Modify que_fork_start_command() to do only one pass over the thread list
instead of three.
parent
cc80a72c
Changes
1
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33 additions
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32 deletions
+33
-32
que/que0que.c
que/que0que.c
+33
-32
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que/que0que.c
View file @
d3858fb6
...
@@ -335,6 +335,8 @@ que_fork_start_command(
...
@@ -335,6 +335,8 @@ que_fork_start_command(
que_fork_t
*
fork
)
/* in: a query fork */
que_fork_t
*
fork
)
/* in: a query fork */
{
{
que_thr_t
*
thr
;
que_thr_t
*
thr
;
que_thr_t
*
suspended_thr
=
NULL
;
que_thr_t
*
completed_thr
=
NULL
;
fork
->
state
=
QUE_FORK_ACTIVE
;
fork
->
state
=
QUE_FORK_ACTIVE
;
...
@@ -344,14 +346,18 @@ que_fork_start_command(
...
@@ -344,14 +346,18 @@ que_fork_start_command(
but in a parallelized select, which necessarily is non-scrollable,
but in a parallelized select, which necessarily is non-scrollable,
there may be several to choose from */
there may be several to choose from */
/*---------------------------------------------------------------
/* First we try to find a query thread in the QUE_THR_COMMAND_WAIT
First we try to find a query thread in the QUE_THR_COMMAND_WAIT state
state. Then we try to find a query thread in the QUE_THR_SUSPENDED
*/
state, finally we try to find a query thread in the QUE_THR_COMPLETED
state */
thr
=
UT_LIST_GET_FIRST
(
fork
->
thrs
);
thr
=
UT_LIST_GET_FIRST
(
fork
->
thrs
);
while
(
thr
!=
NULL
)
{
/* We make a single pass over the thr list within which we note which
if
(
thr
->
state
==
QUE_THR_COMMAND_WAIT
)
{
threads are ready to run. */
while
(
thr
)
{
switch
(
thr
->
state
)
{
case
QUE_THR_COMMAND_WAIT
:
/* We have to send the initial message to query thread
/* We have to send the initial message to query thread
to start it */
to start it */
...
@@ -359,49 +365,44 @@ que_fork_start_command(
...
@@ -359,49 +365,44 @@ que_fork_start_command(
que_thr_init_command
(
thr
);
que_thr_init_command
(
thr
);
return
(
thr
);
return
(
thr
);
}
ut_ad
(
thr
->
state
!=
QUE_THR_LOCK_WAIT
);
thr
=
UT_LIST_GET_NEXT
(
thrs
,
thr
);
}
/*----------------------------------------------------------------
Then we try to find a query thread in the QUE_THR_SUSPENDED state */
thr
=
UT_LIST_GET_FIRST
(
fork
->
thrs
);
case
QUE_THR_SUSPENDED
:
while
(
thr
!=
NULL
)
{
if
(
thr
->
state
==
QUE_THR_SUSPENDED
)
{
/* In this case the execution of the thread was
/* In this case the execution of the thread was
suspended: no initial message is needed because
suspended: no initial message is needed because
execution can continue from where it was left */
execution can continue from where it was left */
if
(
!
suspended_thr
)
{
suspended_thr
=
thr
;
}
que_thr_move_to_run_state
(
thr
);
break
;
case
QUE_THR_COMPLETED
:
if
(
!
completed_thr
)
{
completed_thr
=
thr
;
}
break
;
case
QUE_THR_LOCK_WAIT
:
ut_error
;
return
(
thr
);
}
}
thr
=
UT_LIST_GET_NEXT
(
thrs
,
thr
);
thr
=
UT_LIST_GET_NEXT
(
thrs
,
thr
);
}
}
/*-----------------------------------------------------------------
if
(
suspended_thr
)
{
Then we try to find a query thread in the QUE_THR_COMPLETED state */
thr
=
UT_LIST_GET_FIRST
(
fork
->
thrs
);
while
(
thr
!=
NULL
)
{
thr
=
suspended_thr
;
if
(
thr
->
state
==
QUE_THR_COMPLETED
)
{
que_thr_move_to_run_state
(
thr
);
que_thr_init_command
(
thr
);
return
(
thr
);
}
else
if
(
completed_thr
)
{
}
thr
=
UT_LIST_GET_NEXT
(
thrs
,
thr
);
thr
=
completed_thr
;
que_thr_init_command
(
thr
);
}
}
/* Else we return NULL */
return
(
thr
);
return
(
NULL
);
}
}
/**************************************************************************
/**************************************************************************
...
...
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