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authorroot <root>2007-12-07 19:23:48 +0000
committerroot <root>2007-12-07 19:23:48 +0000
commit39ca7b64db757c30ab6f0dc5dad63206f1d5a375 (patch)
tree2d5ee139f82e12e2d23c1ef4149bfeb58e94eda0 /ev.html
parent1ef940ed393da8f8d74505196399215d6bb21016 (diff)
*** empty log message ***
Diffstat (limited to 'ev.html')
-rw-r--r--ev.html14
1 files changed, 8 insertions, 6 deletions
diff --git a/ev.html b/ev.html
index 9192f32..63ddf3b 100644
--- a/ev.html
+++ b/ev.html
@@ -6,7 +6,7 @@
<meta name="description" content="Pod documentation for libev" />
<meta name="inputfile" content="&lt;standard input&gt;" />
<meta name="outputfile" content="&lt;standard output&gt;" />
- <meta name="created" content="Fri Dec 7 20:07:44 2007" />
+ <meta name="created" content="Fri Dec 7 20:23:46 2007" />
<meta name="generator" content="Pod::Xhtml 1.57" />
<link rel="stylesheet" href="http://res.tst.eu/pod.css"/></head>
<body>
@@ -2241,6 +2241,11 @@ that everybody includes and which overrides some configure choices:</p>
<p>In this section the complexities of (many of) the algorithms used inside
libev will be explained. For complexity discussions about backends see the
documentation for <code>ev_default_init</code>.</p>
+ <p>All of the following are about amortised time: If an array needs to be
+extended, libev needs to realloc and move the whole array, but this
+happens asymptotically never with higher number of elements, so O(1) might
+mean it might do a lengthy realloc operation in rare cases, but on average
+it is much faster and asymptotically approaches constant time.</p>
<p>
<dl>
<dt>Starting and stopping timer/periodic watchers: O(log skipped_other_timers)</dt>
@@ -2256,12 +2261,9 @@ as only the relative motion in the event queue has to be paid for.</p>
</dd>
<dt>Starting io/check/prepare/idle/signal/child watchers: O(1)</dt>
<dd>
- <p>These just add the watcher into an array or at the head of a list. If
-the array needs to be extended libev needs to realloc and move the whole
-array, but this happen asymptotically less and less with more watchers,
-thus amortised O(1).</p>
+ <p>These just add the watcher into an array or at the head of a list.
+=item Stopping check/prepare/idle watchers: O(1)</p>
</dd>
- <dt>Stopping check/prepare/idle watchers: O(1)</dt>
<dt>Stopping an io/signal/child watcher: O(number_of_watchers_for_this_(fd/signal/pid % EV_PID_HASHSIZE))</dt>
<dd>
<p>These watchers are stored in lists then need to be walked to find the