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- <meta name="created" content="Sat Nov 24 10:48:32 2007" />
+ <meta name="created" content="Sat Nov 24 17:57:37 2007" />
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<body>
<li><a href="#GLOBAL_FUNCTIONS">GLOBAL FUNCTIONS</a></li>
<li><a href="#FUNCTIONS_CONTROLLING_THE_EVENT_LOOP">FUNCTIONS CONTROLLING THE EVENT LOOP</a></li>
<li><a href="#ANATOMY_OF_A_WATCHER">ANATOMY OF A WATCHER</a>
-<ul><li><a href="#SUMMARY_OF_GENERIC_WATCHER_FUNCTIONS">SUMMARY OF GENERIC WATCHER FUNCTIONS</a></li>
+<ul><li><a href="#GENERIC_WATCHER_FUNCTIONS">GENERIC WATCHER FUNCTIONS</a></li>
<li><a href="#ASSOCIATING_CUSTOM_DATA_WITH_A_WATCH">ASSOCIATING CUSTOM DATA WITH A WATCHER</a></li>
</ul>
</li>
<li><a href="#WATCHER_TYPES">WATCHER TYPES</a>
-<ul><li><a href="#code_ev_io_code_is_this_file_descrip"><code>ev_io</code> - is this file descriptor readable or writable</a></li>
-<li><a href="#code_ev_timer_code_relative_and_opti"><code>ev_timer</code> - relative and optionally recurring timeouts</a></li>
-<li><a href="#code_ev_periodic_code_to_cron_or_not"><code>ev_periodic</code> - to cron or not to cron</a></li>
-<li><a href="#code_ev_signal_code_signal_me_when_a"><code>ev_signal</code> - signal me when a signal gets signalled</a></li>
-<li><a href="#code_ev_child_code_wait_for_pid_stat"><code>ev_child</code> - wait for pid status changes</a></li>
-<li><a href="#code_ev_idle_code_when_you_ve_got_no"><code>ev_idle</code> - when you've got nothing better to do</a></li>
-<li><a href="#code_ev_prepare_code_and_code_ev_che"><code>ev_prepare</code> and <code>ev_check</code> - customise your event loop</a></li>
-<li><a href="#code_ev_embed_code_when_one_backend_"><code>ev_embed</code> - when one backend isn't enough</a></li>
+<ul><li><a href="#code_ev_io_code_is_this_file_descrip"><code>ev_io</code> - is this file descriptor readable or writable?</a></li>
+<li><a href="#code_ev_timer_code_relative_and_opti"><code>ev_timer</code> - relative and optionally repeating timeouts</a></li>
+<li><a href="#code_ev_periodic_code_to_cron_or_not"><code>ev_periodic</code> - to cron or not to cron?</a></li>
+<li><a href="#code_ev_signal_code_signal_me_when_a"><code>ev_signal</code> - signal me when a signal gets signalled!</a></li>
+<li><a href="#code_ev_child_code_watch_out_for_pro"><code>ev_child</code> - watch out for process status changes</a></li>
+<li><a href="#code_ev_idle_code_when_you_ve_got_no"><code>ev_idle</code> - when you've got nothing better to do...</a></li>
+<li><a href="#code_ev_prepare_code_and_code_ev_che"><code>ev_prepare</code> and <code>ev_check</code> - customise your event loop!</a></li>
+<li><a href="#code_ev_embed_code_when_one_backend_"><code>ev_embed</code> - when one backend isn't enough...</a></li>
</ul>
</li>
<li><a href="#OTHER_FUNCTIONS">OTHER FUNCTIONS</a></li>
<li><a href="#LIBEVENT_EMULATION">LIBEVENT EMULATION</a></li>
<li><a href="#C_SUPPORT">C++ SUPPORT</a></li>
+<li><a href="#EMBEDDING">EMBEDDING</a>
+<ul><li><a href="#FILESETS">FILESETS</a>
+<ul><li><a href="#CORE_EVENT_LOOP">CORE EVENT LOOP</a></li>
+<li><a href="#LIBEVENT_COMPATIBILITY_API">LIBEVENT COMPATIBILITY API</a></li>
+<li><a href="#AUTOCONF_SUPPORT">AUTOCONF SUPPORT</a></li>
+</ul>
+</li>
+<li><a href="#PREPROCESSOR_SYMBOLS_MACROS">PREPROCESSOR SYMBOLS/MACROS</a></li>
+<li><a href="#EXAMPLES">EXAMPLES</a></li>
+</ul>
+</li>
<li><a href="#AUTHOR">AUTHOR</a>
</li>
</ul><hr />
</dd>
</dl>
+
+
+
+
</div>
<h1 id="ANATOMY_OF_A_WATCHER">ANATOMY OF A WATCHER</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="ANATOMY_OF_A_WATCHER_CONTENT">
</dl>
</div>
-<h2 id="SUMMARY_OF_GENERIC_WATCHER_FUNCTIONS">SUMMARY OF GENERIC WATCHER FUNCTIONS</h2>
-<div id="SUMMARY_OF_GENERIC_WATCHER_FUNCTIONS-2">
+<h2 id="GENERIC_WATCHER_FUNCTIONS">GENERIC WATCHER FUNCTIONS</h2>
+<div id="GENERIC_WATCHER_FUNCTIONS_CONTENT">
<p>In the following description, <code>TYPE</code> stands for the watcher type,
e.g. <code>timer</code> for <code>ev_timer</code> watchers and <code>io</code> for <code>ev_io</code> watchers.</p>
<dl>
which rolls both calls into one.</p>
<p>You can reinitialise a watcher at any time as long as it has been stopped
(or never started) and there are no pending events outstanding.</p>
- <p>The callbakc is always of type <code>void (*)(ev_loop *loop, ev_TYPE *watcher,
+ <p>The callback is always of type <code>void (*)(ev_loop *loop, ev_TYPE *watcher,
int revents)</code>.</p>
</dd>
<dt><code>ev_TYPE_set</code> (ev_TYPE *, [args])</dt>
</div>
-<h2 id="code_ev_io_code_is_this_file_descrip"><code>ev_io</code> - is this file descriptor readable or writable</h2>
+<h2 id="code_ev_io_code_is_this_file_descrip"><code>ev_io</code> - is this file descriptor readable or writable?</h2>
<div id="code_ev_io_code_is_this_file_descrip-2">
<p>I/O watchers check whether a file descriptor is readable or writable
-in each iteration of the event loop (This behaviour is called
-level-triggering because you keep receiving events as long as the
-condition persists. Remember you can stop the watcher if you don't want to
-act on the event and neither want to receive future events).</p>
+in each iteration of the event loop, or, more precisely, when reading
+would not block the process and writing would at least be able to write
+some data. This behaviour is called level-triggering because you keep
+receiving events as long as the condition persists. Remember you can stop
+the watcher if you don't want to act on the event and neither want to
+receive future events.</p>
<p>In general you can register as many read and/or write event watchers per
fd as you want (as long as you don't confuse yourself). Setting all file
descriptors to non-blocking mode is also usually a good idea (but not
<p>You have to be careful with dup'ed file descriptors, though. Some backends
(the linux epoll backend is a notable example) cannot handle dup'ed file
descriptors correctly if you register interest in two or more fds pointing
-to the same underlying file/socket etc. description (that is, they share
+to the same underlying file/socket/etc. description (that is, they share
the same underlying "file open").</p>
<p>If you must do this, then force the use of a known-to-be-good backend
(at the time of this writing, this includes only <code>EVBACKEND_SELECT</code> and
<code>EVBACKEND_POLL</code>).</p>
+<p>Another thing you have to watch out for is that it is quite easy to
+receive "spurious" readyness notifications, that is your callback might
+be called with <code>EV_READ</code> but a subsequent <code>read</code>(2) will actually block
+because there is no data. Not only are some backends known to create a
+lot of those (for example solaris ports), it is very easy to get into
+this situation even with a relatively standard program structure. Thus
+it is best to always use non-blocking I/O: An extra <code>read</code>(2) returning
+<code>EAGAIN</code> is far preferable to a program hanging until some data arrives.</p>
+<p>If you cannot run the fd in non-blocking mode (for example you should not
+play around with an Xlib connection), then you have to seperately re-test
+wether a file descriptor is really ready with a known-to-be good interface
+such as poll (fortunately in our Xlib example, Xlib already does this on
+its own, so its quite safe to use).</p>
<dl>
<dt>ev_io_init (ev_io *, callback, int fd, int events)</dt>
<dt>ev_io_set (ev_io *, int fd, int events)</dt>
<dd>
- <p>Configures an <code>ev_io</code> watcher. The fd is the file descriptor to rceeive
-events for and events is either <code>EV_READ</code>, <code>EV_WRITE</code> or <code>EV_READ |
-EV_WRITE</code> to receive the given events.</p>
- <p>Please note that most of the more scalable backend mechanisms (for example
-epoll and solaris ports) can result in spurious readyness notifications
-for file descriptors, so you practically need to use non-blocking I/O (and
-treat callback invocation as hint only), or retest separately with a safe
-interface before doing I/O (XLib can do this), or force the use of either
-<code>EVBACKEND_SELECT</code> or <code>EVBACKEND_POLL</code>, which don't suffer from this
-problem. Also note that it is quite easy to have your callback invoked
-when the readyness condition is no longer valid even when employing
-typical ways of handling events, so its a good idea to use non-blocking
-I/O unconditionally.</p>
+ <p>Configures an <code>ev_io</code> watcher. The <code>fd</code> is the file descriptor to
+rceeive events for and events is either <code>EV_READ</code>, <code>EV_WRITE</code> or
+<code>EV_READ | EV_WRITE</code> to receive the given events.</p>
</dd>
</dl>
<p>Example: call <code>stdin_readable_cb</code> when STDIN_FILENO has become, well
</pre>
</div>
-<h2 id="code_ev_timer_code_relative_and_opti"><code>ev_timer</code> - relative and optionally recurring timeouts</h2>
+<h2 id="code_ev_timer_code_relative_and_opti"><code>ev_timer</code> - relative and optionally repeating timeouts</h2>
<div id="code_ev_timer_code_relative_and_opti-2">
<p>Timer watchers are simple relative timers that generate an event after a
given time, and optionally repeating in regular intervals after that.</p>
</pre>
</div>
-<h2 id="code_ev_periodic_code_to_cron_or_not"><code>ev_periodic</code> - to cron or not to cron</h2>
+<h2 id="code_ev_periodic_code_to_cron_or_not"><code>ev_periodic</code> - to cron or not to cron?</h2>
<div id="code_ev_periodic_code_to_cron_or_not-2">
<p>Periodic watchers are also timers of a kind, but they are very versatile
(and unfortunately a bit complex).</p>
</pre>
</div>
-<h2 id="code_ev_signal_code_signal_me_when_a"><code>ev_signal</code> - signal me when a signal gets signalled</h2>
+<h2 id="code_ev_signal_code_signal_me_when_a"><code>ev_signal</code> - signal me when a signal gets signalled!</h2>
<div id="code_ev_signal_code_signal_me_when_a-2">
<p>Signal watchers will trigger an event when the process receives a specific
signal one or more times. Even though signals are very asynchronous, libev
</div>
-<h2 id="code_ev_child_code_wait_for_pid_stat"><code>ev_child</code> - wait for pid status changes</h2>
-<div id="code_ev_child_code_wait_for_pid_stat-2">
+<h2 id="code_ev_child_code_watch_out_for_pro"><code>ev_child</code> - watch out for process status changes</h2>
+<div id="code_ev_child_code_watch_out_for_pro-2">
<p>Child watchers trigger when your process receives a SIGCHLD in response to
some child status changes (most typically when a child of yours dies).</p>
<dl>
</pre>
</div>
-<h2 id="code_ev_idle_code_when_you_ve_got_no"><code>ev_idle</code> - when you've got nothing better to do</h2>
+<h2 id="code_ev_idle_code_when_you_ve_got_no"><code>ev_idle</code> - when you've got nothing better to do...</h2>
<div id="code_ev_idle_code_when_you_ve_got_no-2">
<p>Idle watchers trigger events when there are no other events are pending
(prepare, check and other idle watchers do not count). That is, as long
</pre>
</div>
-<h2 id="code_ev_prepare_code_and_code_ev_che"><code>ev_prepare</code> and <code>ev_check</code> - customise your event loop</h2>
+<h2 id="code_ev_prepare_code_and_code_ev_che"><code>ev_prepare</code> and <code>ev_check</code> - customise your event loop!</h2>
<div id="code_ev_prepare_code_and_code_ev_che-2">
<p>Prepare and check watchers are usually (but not always) used in tandem:
prepare watchers get invoked before the process blocks and check watchers
</div>
-<h2 id="code_ev_embed_code_when_one_backend_"><code>ev_embed</code> - when one backend isn't enough</h2>
+<h2 id="code_ev_embed_code_when_one_backend_"><code>ev_embed</code> - when one backend isn't enough...</h2>
<div id="code_ev_embed_code_when_one_backend_-2">
<p>This is a rather advanced watcher type that lets you embed one event loop
into another (currently only <code>ev_io</code> events are supported in the embedded
</pre>
+</div>
+<h1 id="EMBEDDING">EMBEDDING</h1><p><a href="#TOP" class="toplink">Top</a></p>
+<div id="EMBEDDING_CONTENT">
+<p>Libev can (and often is) directly embedded into host
+applications. Examples of applications that embed it include the Deliantra
+Game Server, the EV perl module, the GNU Virtual Private Ethernet (gvpe)
+and rxvt-unicode.</p>
+<p>The goal is to enable you to just copy the neecssary files into your
+source directory without having to change even a single line in them, so
+you can easily upgrade by simply copying (or having a checked-out copy of
+libev somewhere in your source tree).</p>
+
+</div>
+<h2 id="FILESETS">FILESETS</h2>
+<div id="FILESETS_CONTENT">
+<p>Depending on what features you need you need to include one or more sets of files
+in your app.</p>
+
+</div>
+<h3 id="CORE_EVENT_LOOP">CORE EVENT LOOP</h3>
+<div id="CORE_EVENT_LOOP_CONTENT">
+<p>To include only the libev core (all the <code>ev_*</code> functions), with manual
+configuration (no autoconf):</p>
+<pre> #define EV_STANDALONE 1
+ #include "ev.c"
+
+</pre>
+<p>This will automatically include <cite>ev.h</cite>, too, and should be done in a
+single C source file only to provide the function implementations. To use
+it, do the same for <cite>ev.h</cite> in all files wishing to use this API (best
+done by writing a wrapper around <cite>ev.h</cite> that you can include instead and
+where you can put other configuration options):</p>
+<pre> #define EV_STANDALONE 1
+ #include "ev.h"
+
+</pre>
+<p>Both header files and implementation files can be compiled with a C++
+compiler (at least, thats a stated goal, and breakage will be treated
+as a bug).</p>
+<p>You need the following files in your source tree, or in a directory
+in your include path (e.g. in libev/ when using -Ilibev):</p>
+<pre> ev.h
+ ev.c
+ ev_vars.h
+ ev_wrap.h
+
+ ev_win32.c required on win32 platforms only
+
+ ev_select.c only when select backend is enabled (which is by default)
+ ev_poll.c only when poll backend is enabled (disabled by default)
+ ev_epoll.c only when the epoll backend is enabled (disabled by default)
+ ev_kqueue.c only when the kqueue backend is enabled (disabled by default)
+ ev_port.c only when the solaris port backend is enabled (disabled by default)
+
+</pre>
+<p><cite>ev.c</cite> includes the backend files directly when enabled, so you only need
+to compile this single file.</p>
+
+</div>
+<h3 id="LIBEVENT_COMPATIBILITY_API">LIBEVENT COMPATIBILITY API</h3>
+<div id="LIBEVENT_COMPATIBILITY_API_CONTENT">
+<p>To include the libevent compatibility API, also include:</p>
+<pre> #include "event.c"
+
+</pre>
+<p>in the file including <cite>ev.c</cite>, and:</p>
+<pre> #include "event.h"
+
+</pre>
+<p>in the files that want to use the libevent API. This also includes <cite>ev.h</cite>.</p>
+<p>You need the following additional files for this:</p>
+<pre> event.h
+ event.c
+
+</pre>
+
+</div>
+<h3 id="AUTOCONF_SUPPORT">AUTOCONF SUPPORT</h3>
+<div id="AUTOCONF_SUPPORT_CONTENT">
+<p>Instead of using <code>EV_STANDALONE=1</code> and providing your config in
+whatever way you want, you can also <code>m4_include([libev.m4])</code> in your
+<cite>configure.ac</cite> and leave <code>EV_STANDALONE</code> undefined. <cite>ev.c</cite> will then
+include <cite>config.h</cite> and configure itself accordingly.</p>
+<p>For this of course you need the m4 file:</p>
+<pre> libev.m4
+
+</pre>
+
+</div>
+<h2 id="PREPROCESSOR_SYMBOLS_MACROS">PREPROCESSOR SYMBOLS/MACROS</h2>
+<div id="PREPROCESSOR_SYMBOLS_MACROS_CONTENT">
+<p>Libev can be configured via a variety of preprocessor symbols you have to define
+before including any of its files. The default is not to build for multiplicity
+and only include the select backend.</p>
+<dl>
+ <dt>EV_STANDALONE</dt>
+ <dd>
+ <p>Must always be <code>1</code> if you do not use autoconf configuration, which
+keeps libev from including <cite>config.h</cite>, and it also defines dummy
+implementations for some libevent functions (such as logging, which is not
+supported). It will also not define any of the structs usually found in
+<cite>event.h</cite> that are not directly supported by the libev core alone.</p>
+ </dd>
+ <dt>EV_USE_MONOTONIC</dt>
+ <dd>
+ <p>If defined to be <code>1</code>, libev will try to detect the availability of the
+monotonic clock option at both compiletime and runtime. Otherwise no use
+of the monotonic clock option will be attempted. If you enable this, you
+usually have to link against librt or something similar. Enabling it when
+the functionality isn't available is safe, though, althoguh you have
+to make sure you link against any libraries where the <code>clock_gettime</code>
+function is hiding in (often <cite>-lrt</cite>).</p>
+ </dd>
+ <dt>EV_USE_REALTIME</dt>
+ <dd>
+ <p>If defined to be <code>1</code>, libev will try to detect the availability of the
+realtime clock option at compiletime (and assume its availability at
+runtime if successful). Otherwise no use of the realtime clock option will
+be attempted. This effectively replaces <code>gettimeofday</code> by <code>clock_get
+(CLOCK_REALTIME, ...)</code> and will not normally affect correctness. See tzhe note about libraries
+in the description of <code>EV_USE_MONOTONIC</code>, though.</p>
+ </dd>
+ <dt>EV_USE_SELECT</dt>
+ <dd>
+ <p>If undefined or defined to be <code>1</code>, libev will compile in support for the
+<code>select</code>(2) backend. No attempt at autodetection will be done: if no
+other method takes over, select will be it. Otherwise the select backend
+will not be compiled in.</p>
+ </dd>
+ <dt>EV_SELECT_USE_FD_SET</dt>
+ <dd>
+ <p>If defined to <code>1</code>, then the select backend will use the system <code>fd_set</code>
+structure. This is useful if libev doesn't compile due to a missing
+<code>NFDBITS</code> or <code>fd_mask</code> definition or it misguesses the bitset layout on
+exotic systems. This usually limits the range of file descriptors to some
+low limit such as 1024 or might have other limitations (winsocket only
+allows 64 sockets). The <code>FD_SETSIZE</code> macro, set before compilation, might
+influence the size of the <code>fd_set</code> used.</p>
+ </dd>
+ <dt>EV_SELECT_IS_WINSOCKET</dt>
+ <dd>
+ <p>When defined to <code>1</code>, the select backend will assume that
+select/socket/connect etc. don't understand file descriptors but
+wants osf handles on win32 (this is the case when the select to
+be used is the winsock select). This means that it will call
+<code>_get_osfhandle</code> on the fd to convert it to an OS handle. Otherwise,
+it is assumed that all these functions actually work on fds, even
+on win32. Should not be defined on non-win32 platforms.</p>
+ </dd>
+ <dt>EV_USE_POLL</dt>
+ <dd>
+ <p>If defined to be <code>1</code>, libev will compile in support for the <code>poll</code>(2)
+backend. Otherwise it will be enabled on non-win32 platforms. It
+takes precedence over select.</p>
+ </dd>
+ <dt>EV_USE_EPOLL</dt>
+ <dd>
+ <p>If defined to be <code>1</code>, libev will compile in support for the Linux
+<code>epoll</code>(7) backend. Its availability will be detected at runtime,
+otherwise another method will be used as fallback. This is the
+preferred backend for GNU/Linux systems.</p>
+ </dd>
+ <dt>EV_USE_KQUEUE</dt>
+ <dd>
+ <p>If defined to be <code>1</code>, libev will compile in support for the BSD style
+<code>kqueue</code>(2) backend. Its actual availability will be detected at runtime,
+otherwise another method will be used as fallback. This is the preferred
+backend for BSD and BSD-like systems, although on most BSDs kqueue only
+supports some types of fds correctly (the only platform we found that
+supports ptys for example was NetBSD), so kqueue might be compiled in, but
+not be used unless explicitly requested. The best way to use it is to find
+out whether kqueue supports your type of fd properly and use an embedded
+kqueue loop.</p>
+ </dd>
+ <dt>EV_USE_PORT</dt>
+ <dd>
+ <p>If defined to be <code>1</code>, libev will compile in support for the Solaris
+10 port style backend. Its availability will be detected at runtime,
+otherwise another method will be used as fallback. This is the preferred
+backend for Solaris 10 systems.</p>
+ </dd>
+ <dt>EV_USE_DEVPOLL</dt>
+ <dd>
+ <p>reserved for future expansion, works like the USE symbols above.</p>
+ </dd>
+ <dt>EV_H</dt>
+ <dd>
+ <p>The name of the <cite>ev.h</cite> header file used to include it. The default if
+undefined is <code><ev.h></code> in <cite>event.h</cite> and <code>"ev.h"</code> in <cite>ev.c</cite>. This
+can be used to virtually rename the <cite>ev.h</cite> header file in case of conflicts.</p>
+ </dd>
+ <dt>EV_CONFIG_H</dt>
+ <dd>
+ <p>If <code>EV_STANDALONE</code> isn't <code>1</code>, this variable can be used to override
+<cite>ev.c</cite>'s idea of where to find the <cite>config.h</cite> file, similarly to
+<code>EV_H</code>, above.</p>
+ </dd>
+ <dt>EV_EVENT_H</dt>
+ <dd>
+ <p>Similarly to <code>EV_H</code>, this macro can be used to override <cite>event.c</cite>'s idea
+of how the <cite>event.h</cite> header can be found.</p>
+ </dd>
+ <dt>EV_PROTOTYPES</dt>
+ <dd>
+ <p>If defined to be <code>0</code>, then <cite>ev.h</cite> will not define any function
+prototypes, but still define all the structs and other symbols. This is
+occasionally useful if you want to provide your own wrapper functions
+around libev functions.</p>
+ </dd>
+ <dt>EV_MULTIPLICITY</dt>
+ <dd>
+ <p>If undefined or defined to <code>1</code>, then all event-loop-specific functions
+will have the <code>struct ev_loop *</code> as first argument, and you can create
+additional independent event loops. Otherwise there will be no support
+for multiple event loops and there is no first event loop pointer
+argument. Instead, all functions act on the single default loop.</p>
+ </dd>
+ <dt>EV_PERIODICS</dt>
+ <dd>
+ <p>If undefined or defined to be <code>1</code>, then periodic timers are supported,
+otherwise not. This saves a few kb of code.</p>
+ </dd>
+ <dt>EV_COMMON</dt>
+ <dd>
+ <p>By default, all watchers have a <code>void *data</code> member. By redefining
+this macro to a something else you can include more and other types of
+members. You have to define it each time you include one of the files,
+though, and it must be identical each time.</p>
+ <p>For example, the perl EV module uses something like this:</p>
+<pre> #define EV_COMMON \
+ SV *self; /* contains this struct */ \
+ SV *cb_sv, *fh /* note no trailing ";" */
+
+</pre>
+ </dd>
+ <dt>EV_CB_DECLARE (type)</dt>
+ <dt>EV_CB_INVOKE (watcher, revents)</dt>
+ <dt>ev_set_cb (ev, cb)</dt>
+ <dd>
+ <p>Can be used to change the callback member declaration in each watcher,
+and the way callbacks are invoked and set. Must expand to a struct member
+definition and a statement, respectively. See the <cite>ev.v</cite> header file for
+their default definitions. One possible use for overriding these is to
+avoid the <code>struct ev_loop *</code> as first argument in all cases, or to use
+method calls instead of plain function calls in C++.</p>
+
+</div>
+<h2 id="EXAMPLES">EXAMPLES</h2>
+<div id="EXAMPLES_CONTENT">
+ <p>For a real-world example of a program the includes libev
+verbatim, you can have a look at the EV perl module
+(<a href="http://software.schmorp.de/pkg/EV.html">http://software.schmorp.de/pkg/EV.html</a>). It has the libev files in
+the <cite>libev/</cite> subdirectory and includes them in the <cite>EV/EVAPI.h</cite> (public
+interface) and <cite>EV.xs</cite> (implementation) files. Only the <cite>EV.xs</cite> file
+will be compiled. It is pretty complex because it provides its own header
+file.</p>
+ <p>The usage in rxvt-unicode is simpler. It has a <cite>ev_cpp.h</cite> header file
+that everybody includes and which overrides some autoconf choices:</p>
+<pre> #define EV_USE_POLL 0
+ #define EV_MULTIPLICITY 0
+ #define EV_PERIODICS 0
+ #define EV_CONFIG_H <config.h>
+
+ #include "ev++.h"
+
+</pre>
+ <p>And a <cite>ev_cpp.C</cite> implementation file that contains libev proper and is compiled:</p>
+<pre> #include "ev_cpp.h"
+ #include "ev.c"
+
+</pre>
+
</div>
<h1 id="AUTHOR">AUTHOR</h1><p><a href="#TOP" class="toplink">Top</a></p>
<div id="AUTHOR_CONTENT">
-<p>Marc Lehmann <libev@schmorp.de>.</p>
+
<p>Marc Lehmann <libev@schmorp.de>.</p>
</div>
</div></body>
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