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node/lib/timers.js at https · reado/node · GitHub
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timers.js
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var
Timer
=
process
.
binding
(
'timer'
)
.
Timer
;
var
assert
=
process
.
assert
;
/*
* To enable debug statements for the timers do NODE_DEBUG=8 ./node script.js
*/
var
debugLevel
=
parseInt
(
process
.
env
.
NODE_DEBUG
,
16
)
;
var
debug
;
if
(
debugLevel
&
0x8
)
{
debug
=
function
(
)
{
require
(
'util'
)
.
error
.
apply
(
this
,
arguments
)
;
}
;
}
else
{
debug
=
function
(
)
{
}
;
}
// IDLE TIMEOUTS
//
// Because often many sockets will have the same idle timeout we will not
// use one timeout watcher per item. It is too much overhead. Instead
// we'll use a single watcher for all sockets with the same timeout value
// and a linked list. This technique is described in the libev manual:
// http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#Be_smart_about_timeouts
// Object containing all lists, timers
// key = time in milliseconds
// value = list
var
lists
=
{
}
;
// show the most idle item
function
peek
(
list
)
{
if
(
list
.
_idlePrev
==
list
)
return
null
;
return
list
.
_idlePrev
;
}
// remove the most idle item from the list
function
shift
(
list
)
{
var
first
=
list
.
_idlePrev
;
remove
(
first
)
;
return
first
;
}
// remove a item from its list
function
remove
(
item
)
{
item
.
_idleNext
.
_idlePrev
=
item
.
_idlePrev
;
item
.
_idlePrev
.
_idleNext
=
item
.
_idleNext
;
}
// remove a item from its list and place at the end.
function
append
(
list
,
item
)
{
item
.
_idleNext
=
list
.
_idleNext
;
list
.
_idleNext
.
_idlePrev
=
item
;
item
.
_idlePrev
=
list
;
list
.
_idleNext
=
item
;
}
// the main function - creates lists on demand and the watchers associated
// with them.
function
insert
(
item
,
msecs
)
{
item
.
_idleStart
=
new
Date
(
)
;
item
.
_idleTimeout
=
msecs
;
if
(
msecs
<
0
)
return
;
var
list
;
if
(
lists
[
msecs
]
)
{
list
=
lists
[
msecs
]
;
}
else
{
list
=
new
Timer
(
)
;
list
.
_idleNext
=
list
;
list
.
_idlePrev
=
list
;
lists
[
msecs
]
=
list
;
list
.
callback
=
function
(
)
{
debug
(
'timeout callback '
+
msecs
)
;
// TODO - don't stop and start the watcher all the time.
// just set its repeat
var
now
=
new
Date
(
)
;
debug
(
'now: '
+
now
)
;
var
first
;
while
(
first
=
peek
(
list
)
)
{
var
diff
=
now
-
first
.
_idleStart
;
if
(
diff
<
msecs
)
{
list
.
again
(
msecs
-
diff
)
;
debug
(
msecs
+
' list wait because diff is '
+
diff
)
;
return
;
}
else
{
remove
(
first
)
;
assert
(
first
!==
peek
(
list
)
)
;
if
(
first
.
_onTimeout
)
first
.
_onTimeout
(
)
;
}
}
debug
(
msecs
+
' list empty'
)
;
assert
(
list
.
_idleNext
===
list
)
;
// list is empty
list
.
stop
(
)
;
}
;
}
if
(
list
.
_idleNext
===
list
)
{
// if empty (re)start the timer
list
.
again
(
msecs
)
;
}
append
(
list
,
item
)
;
assert
(
list
.
_idleNext
!==
list
)
;
// list is not empty
}
var
unenroll
=
exports
.
unenroll
=
function
(
item
)
{
if
(
item
.
_idleNext
)
{
remove
(
item
)
;
var
list
=
lists
[
item
.
_idleTimeout
]
;
// if empty then stop the watcher
//debug('unenroll');
if
(
list
&&
list
.
_idlePrev
==
list
)
{
//debug('unenroll: list empty');
list
.
stop
(
)
;
}
}
}
;
// Does not start the time, just sets up the members needed.
exports
.
enroll
=
function
(
item
,
msecs
)
{
// if this item was already in a list somewhere
// then we should unenroll it from that
if
(
item
.
_idleNext
)
unenroll
(
item
)
;
item
.
_idleTimeout
=
msecs
;
item
.
_idleNext
=
item
;
item
.
_idlePrev
=
item
;
}
;
// call this whenever the item is active (not idle)
// it will reset its timeout.
exports
.
active
=
function
(
item
)
{
var
msecs
=
item
.
_idleTimeout
;
if
(
msecs
>=
0
)
{
var
list
=
lists
[
msecs
]
;
if
(
item
.
_idleNext
==
item
)
{
insert
(
item
,
msecs
)
;
}
else
{
// inline append
item
.
_idleStart
=
new
Date
(
)
;
item
.
_idleNext
.
_idlePrev
=
item
.
_idlePrev
;
item
.
_idlePrev
.
_idleNext
=
item
.
_idleNext
;
item
.
_idleNext
=
list
.
_idleNext
;
item
.
_idleNext
.
_idlePrev
=
item
;
item
.
_idlePrev
=
list
;
list
.
_idleNext
=
item
;
}
}
}
;
/*
* DOM-style timers
*/
exports
.
setTimeout
=
function
(
callback
,
after
)
{
var
timer
;
if
(
after
<=
0
)
{
// Use the slow case for after == 0
timer
=
new
Timer
(
)
;
timer
.
callback
=
callback
;
}
else
{
timer
=
{
_idleTimeout
:
after
,
_onTimeout
:
callback
}
;
timer
.
_idlePrev
=
timer
;
timer
.
_idleNext
=
timer
;
}
/*
* Sometimes setTimeout is called with arguments, EG
*
* setTimeout(callback, 2000, "hello", "world")
*
* If that's the case we need to call the callback with
* those args. The overhead of an extra closure is not
* desired in the normal case.
*/
if
(
arguments
.
length
>
2
)
{
var
args
=
Array
.
prototype
.
slice
.
call
(
arguments
,
2
)
;
var
c
=
function
(
)
{
callback
.
apply
(
timer
,
args
)
;
}
;
if
(
timer
instanceof
Timer
)
{
timer
.
callback
=
c
;
}
else
{
timer
.
_onTimeout
=
c
;
}
}
if
(
timer
instanceof
Timer
)
{
timer
.
start
(
0
,
0
)
;
}
else
{
exports
.
active
(
timer
)
;
}
return
timer
;
}
;
exports
.
clearTimeout
=
function
(
timer
)
{
if
(
timer
&&
(
timer
.
callback
||
timer
.
_onTimeout
)
)
{
timer
.
callback
=
timer
.
_onTimeout
=
null
;
exports
.
unenroll
(
timer
)
;
if
(
timer
instanceof
Timer
)
timer
.
stop
(
)
;
// for after === 0
}
}
;
exports
.
setInterval
=
function
(
callback
,
repeat
)
{
var
timer
=
new
Timer
(
)
;
if
(
arguments
.
length
>
2
)
{
var
args
=
Array
.
prototype
.
slice
.
call
(
arguments
,
2
)
;
timer
.
callback
=
function
(
)
{
callback
.
apply
(
timer
,
args
)
;
}
;
}
else
{
timer
.
callback
=
callback
;
}
timer
.
start
(
repeat
,
repeat
?
repeat
:
1
)
;
return
timer
;
}
;
exports
.
clearInterval
=
function
(
timer
)
{
if
(
timer
instanceof
Timer
)
{
timer
.
callback
=
null
;
timer
.
stop
(
)
;
}
}
;
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