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authorroot <root>2007-11-27 20:38:07 +0000
committerroot <root>2007-11-27 20:38:07 +0000
commitd62943221d916737d52e83db662e6a1e2f92db0a (patch)
treec58823176c724bd60c0aff8583768564cb0ea69d /ev.html
parente0d2a4b0f08314f5c9f39199ee91f045c2f98d4b (diff)
*** empty log message ***
Diffstat (limited to 'ev.html')
-rw-r--r--ev.html72
1 files changed, 50 insertions, 22 deletions
diff --git a/ev.html b/ev.html
index 011cda6..a107da8 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="Tue Nov 27 21:26:46 2007" />
+ <meta name="created" content="Tue Nov 27 21:38:05 2007" />
<meta name="generator" content="Pod::Xhtml 1.57" />
<link rel="stylesheet" href="http://res.tst.eu/pod.css"/></head>
<body>
@@ -62,19 +62,19 @@
</ul><hr />
<!-- INDEX END -->
-<h1 id="NAME">NAME</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="NAME">NAME</h1>
<div id="NAME_CONTENT">
<p>libev - a high performance full-featured event loop written in C</p>
</div>
-<h1 id="SYNOPSIS">SYNOPSIS</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="SYNOPSIS">SYNOPSIS</h1>
<div id="SYNOPSIS_CONTENT">
<pre> #include &lt;ev.h&gt;
</pre>
</div>
-<h1 id="EXAMPLE_PROGRAM">EXAMPLE PROGRAM</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="EXAMPLE_PROGRAM">EXAMPLE PROGRAM</h1>
<div id="EXAMPLE_PROGRAM_CONTENT">
<pre> #include &lt;ev.h&gt;
@@ -119,7 +119,7 @@
</pre>
</div>
-<h1 id="DESCRIPTION">DESCRIPTION</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="DESCRIPTION">DESCRIPTION</h1>
<div id="DESCRIPTION_CONTENT">
<p>Libev is an event loop: you register interest in certain events (such as a
file descriptor being readable or a timeout occuring), and it will manage
@@ -133,7 +133,7 @@ details of the event, and then hand it over to libev by <i>starting</i> the
watcher.</p>
</div>
-<h1 id="FEATURES">FEATURES</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="FEATURES">FEATURES</h1>
<div id="FEATURES_CONTENT">
<p>Libev supports <code>select</code>, <code>poll</code>, the linux-specific <code>epoll</code>, the
bsd-specific <code>kqueue</code> and the solaris-specific event port mechanisms
@@ -149,7 +149,7 @@ file watchers (<code>ev_stat</code>) and even limited support for fork events
for example).</p>
</div>
-<h1 id="CONVENTIONS">CONVENTIONS</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="CONVENTIONS">CONVENTIONS</h1>
<div id="CONVENTIONS_CONTENT">
<p>Libev is very configurable. In this manual the default configuration will
be described, which supports multiple event loops. For more info about
@@ -159,7 +159,7 @@ loops, then all functions taking an initial argument of name <code>loop</code>
(which is always of type <code>struct ev_loop *</code>) will not have this argument.</p>
</div>
-<h1 id="TIME_REPRESENTATION">TIME REPRESENTATION</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="TIME_REPRESENTATION">TIME REPRESENTATION</h1>
<div id="TIME_REPRESENTATION_CONTENT">
<p>Libev represents time as a single floating point number, representing the
(fractional) number of seconds since the (POSIX) epoch (somewhere near
@@ -169,7 +169,7 @@ to the <code>double</code> type in C, and when you need to do any calculations o
it, you should treat it as such.</p>
</div>
-<h1 id="GLOBAL_FUNCTIONS">GLOBAL FUNCTIONS</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="GLOBAL_FUNCTIONS">GLOBAL FUNCTIONS</h1>
<div id="GLOBAL_FUNCTIONS_CONTENT">
<p>These functions can be called anytime, even before initialising the
library in any way.</p>
@@ -287,7 +287,7 @@ requested operation, or, if the condition doesn't go away, do bad stuff
</dl>
</div>
-<h1 id="FUNCTIONS_CONTROLLING_THE_EVENT_LOOP">FUNCTIONS CONTROLLING THE EVENT LOOP</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="FUNCTIONS_CONTROLLING_THE_EVENT_LOOP">FUNCTIONS CONTROLLING THE EVENT LOOP</h1>
<div id="FUNCTIONS_CONTROLLING_THE_EVENT_LOOP-2">
<p>An event loop is described by a <code>struct ev_loop *</code>. The library knows two
types of such loops, the <i>default</i> loop, which supports signals and child
@@ -570,7 +570,7 @@ running when nothing else is active.</p>
</div>
-<h1 id="ANATOMY_OF_A_WATCHER">ANATOMY OF A WATCHER</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="ANATOMY_OF_A_WATCHER">ANATOMY OF A WATCHER</h1>
<div id="ANATOMY_OF_A_WATCHER_CONTENT">
<p>A watcher is a structure that you create and register to record your
interest in some event. For instance, if you want to wait for STDIN to
@@ -743,7 +743,7 @@ is pending (but not active) you must not call an init function on it (but
<code>ev_TYPE_set</code> is safe) and you must make sure the watcher is available to
libev (e.g. you cnanot <code>free ()</code> it).</p>
</dd>
- <dt>callback = ev_cb (ev_TYPE *watcher)</dt>
+ <dt>callback ev_cb (ev_TYPE *watcher)</dt>
<dd>
<p>Returns the callback currently set on the watcher.</p>
</dd>
@@ -785,15 +785,43 @@ can cast it back to your own type:</p>
}
</pre>
-<p>More interesting and less C-conformant ways of catsing your callback type
-have been omitted....</p>
+<p>More interesting and less C-conformant ways of casting your callback type
+instead have been omitted.</p>
+<p>Another common scenario is having some data structure with multiple
+watchers:</p>
+<pre> struct my_biggy
+ {
+ int some_data;
+ ev_timer t1;
+ ev_timer t2;
+ }
+</pre>
+<p>In this case getting the pointer to <code>my_biggy</code> is a bit more complicated,
+you need to use <code>offsetof</code>:</p>
+<pre> #include &lt;stddef.h&gt;
+ static void
+ t1_cb (EV_P_ struct ev_timer *w, int revents)
+ {
+ struct my_biggy big = (struct my_biggy *
+ (((char *)w) - offsetof (struct my_biggy, t1));
+ }
+
+ static void
+ t2_cb (EV_P_ struct ev_timer *w, int revents)
+ {
+ struct my_biggy big = (struct my_biggy *
+ (((char *)w) - offsetof (struct my_biggy, t2));
+ }
+
+</pre>
+
</div>
-<h1 id="WATCHER_TYPES">WATCHER TYPES</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="WATCHER_TYPES">WATCHER TYPES</h1>
<div id="WATCHER_TYPES_CONTENT">
<p>This section describes each watcher in detail, but will not repeat
information given in the last section. Any initialisation/set macros,
@@ -1562,7 +1590,7 @@ believe me.</p>
</div>
-<h1 id="OTHER_FUNCTIONS">OTHER FUNCTIONS</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="OTHER_FUNCTIONS">OTHER FUNCTIONS</h1>
<div id="OTHER_FUNCTIONS_CONTENT">
<p>There are some other functions of possible interest. Described. Here. Now.</p>
<dl>
@@ -1619,7 +1647,7 @@ loop!).</p>
</div>
-<h1 id="LIBEVENT_EMULATION">LIBEVENT EMULATION</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="LIBEVENT_EMULATION">LIBEVENT EMULATION</h1>
<div id="LIBEVENT_EMULATION_CONTENT">
<p>Libev offers a compatibility emulation layer for libevent. It cannot
emulate the internals of libevent, so here are some usage hints:</p>
@@ -1639,7 +1667,7 @@ to use the libev header file and library.</dt>
</dl>
</div>
-<h1 id="C_SUPPORT">C++ SUPPORT</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="C_SUPPORT">C++ SUPPORT</h1>
<div id="C_SUPPORT_CONTENT">
<p>Libev comes with some simplistic wrapper classes for C++ that mainly allow
you to use some convinience methods to start/stop watchers and also change
@@ -1744,7 +1772,7 @@ the constructor.</p>
</pre>
</div>
-<h1 id="MACRO_MAGIC">MACRO MAGIC</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="MACRO_MAGIC">MACRO MAGIC</h1>
<div id="MACRO_MAGIC_CONTENT">
<p>Libev can be compiled with a variety of options, the most fundemantal is
<code>EV_MULTIPLICITY</code>. This option determines wether (most) functions and
@@ -1805,7 +1833,7 @@ wether multiple loops are supported or not.</p>
</pre>
</div>
-<h1 id="EMBEDDING">EMBEDDING</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="EMBEDDING">EMBEDDING</h1>
<div id="EMBEDDING_CONTENT">
<p>Libev can (and often is) directly embedded into host
applications. Examples of applications that embed it include the Deliantra
@@ -2109,7 +2137,7 @@ that everybody includes and which overrides some autoconf choices:</p>
</pre>
</div>
-<h1 id="COMPLEXITIES">COMPLEXITIES</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="COMPLEXITIES">COMPLEXITIES</h1>
<div id="COMPLEXITIES_CONTENT">
<p>In this section the complexities of (many of) the algorithms used inside
libev will be explained. For complexity discussions about backends see the
@@ -2132,7 +2160,7 @@ documentation for <code>ev_default_init</code>.</p>
</div>
-<h1 id="AUTHOR">AUTHOR</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<h1 id="AUTHOR">AUTHOR</h1>
<div id="AUTHOR_CONTENT">
<p>Marc Lehmann &lt;libev@schmorp.de&gt;.</p>