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@ -6,7 +6,7 @@ |
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<meta name="description" content="Pod documentation for libev" /> |
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<meta name="inputfile" content="<standard input>" /> |
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<meta name="outputfile" content="<standard output>" /> |
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<meta name="created" content="Tue Nov 27 09:20:40 2007" /> |
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<meta name="created" content="Tue Nov 27 11:59:06 2007" /> |
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<meta name="generator" content="Pod::Xhtml 1.57" /> |
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<link rel="stylesheet" href="http://res.tst.eu/pod.css"/></head> |
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<body> |
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@ -37,11 +37,13 @@ |
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<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> |
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<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> |
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<li><a href="#code_ev_embed_code_when_one_backend_"><code>ev_embed</code> - when one backend isn't enough...</a></li> |
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<li><a href="#code_ev_fork_code_the_audacity_to_re"><code>ev_fork</code> - the audacity to resume the event loop after a fork</a></li> |
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</ul> |
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</li> |
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<li><a href="#OTHER_FUNCTIONS">OTHER FUNCTIONS</a></li> |
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<li><a href="#LIBEVENT_EMULATION">LIBEVENT EMULATION</a></li> |
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<li><a href="#C_SUPPORT">C++ SUPPORT</a></li> |
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<li><a href="#MACRO_MAGIC">MACRO MAGIC</a></li> |
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<li><a href="#EMBEDDING">EMBEDDING</a> |
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<ul><li><a href="#FILESETS">FILESETS</a> |
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<ul><li><a href="#CORE_EVENT_LOOP">CORE EVENT LOOP</a></li> |
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@ -116,10 +118,6 @@ called <code>ev_tstamp</code>, which is what you should use too. It usually alia |
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to the <code>double</code> type in C, and when you need to do any calculations on |
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it, you should treat it as such.</p> |
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</div> |
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<h1 id="GLOBAL_FUNCTIONS">GLOBAL FUNCTIONS</h1><p><a href="#TOP" class="toplink">Top</a></p> |
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<div id="GLOBAL_FUNCTIONS_CONTENT"> |
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@ -607,6 +605,15 @@ received events. Callbacks of both watcher types can start and stop as |
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many watchers as they want, and all of them will be taken into account |
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(for example, a <code>ev_prepare</code> watcher might start an idle watcher to keep |
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<code>ev_loop</code> from blocking).</p> |
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</dd> |
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<dt><code>EV_EMBED</code></dt> |
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<dd> |
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<p>The embedded event loop specified in the <code>ev_embed</code> watcher needs attention.</p> |
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</dd> |
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<dt><code>EV_FORK</code></dt> |
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<dd> |
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<p>The event loop has been resumed in the child process after fork (see |
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<code>ev_fork</code>).</p> |
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</dd> |
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<dt><code>EV_ERROR</code></dt> |
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<dd> |
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@ -1481,6 +1488,29 @@ apropriate way for embedded loops.</p> |
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</div> |
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<h2 id="code_ev_fork_code_the_audacity_to_re"><code>ev_fork</code> - the audacity to resume the event loop after a fork</h2> |
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<div id="code_ev_fork_code_the_audacity_to_re-2"> |
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<p>Fork watchers are called when a <code>fork ()</code> was detected (usually because |
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whoever is a good citizen cared to tell libev about it by calling |
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<code>ev_default_fork</code> or <code>ev_loop_fork</code>). The invocation is done before the |
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event loop blocks next and before <code>ev_check</code> watchers are being called, |
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and only in the child after the fork. If whoever good citizen calling |
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<code>ev_default_fork</code> cheats and calls it in the wrong process, the fork |
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handlers will be invoked, too, of course.</p> |
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<dl> |
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<dt>ev_fork_init (ev_signal *, callback)</dt> |
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<dd> |
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<p>Initialises and configures the fork watcher - it has no parameters of any |
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kind. There is a <code>ev_fork_set</code> macro, but using it is utterly pointless, |
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believe me.</p> |
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</dd> |
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</dl> |
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</div> |
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<h1 id="OTHER_FUNCTIONS">OTHER FUNCTIONS</h1><p><a href="#TOP" class="toplink">Top</a></p> |
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<div id="OTHER_FUNCTIONS_CONTENT"> |
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@ -1658,6 +1688,70 @@ the constructor.</p> |
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io.start (fd, ev::READ); |
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} |
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</pre> |
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</div> |
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<h1 id="MACRO_MAGIC">MACRO MAGIC</h1><p><a href="#TOP" class="toplink">Top</a></p> |
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<div id="MACRO_MAGIC_CONTENT"> |
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<p>Libev can be compiled with a variety of options, the most fundemantal is |
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<code>EV_MULTIPLICITY</code>. This option determines wether (most) functions and |
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callbacks have an initial <code>struct ev_loop *</code> argument.</p> |
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<p>To make it easier to write programs that cope with either variant, the |
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following macros are defined:</p> |
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<dl> |
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<dt><code>EV_A</code>, <code>EV_A_</code></dt> |
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<dd> |
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<p>This provides the loop <i>argument</i> for functions, if one is required ("ev |
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loop argument"). The <code>EV_A</code> form is used when this is the sole argument, |
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<code>EV_A_</code> is used when other arguments are following. Example:</p> |
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<pre> ev_unref (EV_A); |
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ev_timer_add (EV_A_ watcher); |
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ev_loop (EV_A_ 0); |
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</pre> |
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<p>It assumes the variable <code>loop</code> of type <code>struct ev_loop *</code> is in scope, |
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which is often provided by the following macro.</p> |
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</dd> |
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<dt><code>EV_P</code>, <code>EV_P_</code></dt> |
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<dd> |
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<p>This provides the loop <i>parameter</i> for functions, if one is required ("ev |
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loop parameter"). The <code>EV_P</code> form is used when this is the sole parameter, |
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<code>EV_P_</code> is used when other parameters are following. Example:</p> |
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<pre> // this is how ev_unref is being declared |
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static void ev_unref (EV_P); |
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// this is how you can declare your typical callback |
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static void cb (EV_P_ ev_timer *w, int revents) |
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</pre> |
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<p>It declares a parameter <code>loop</code> of type <code>struct ev_loop *</code>, quite |
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suitable for use with <code>EV_A</code>.</p> |
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</dd> |
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<dt><code>EV_DEFAULT</code>, <code>EV_DEFAULT_</code></dt> |
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<dd> |
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<p>Similar to the other two macros, this gives you the value of the default |
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loop, if multiple loops are supported ("ev loop default").</p> |
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</dd> |
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</dl> |
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<p>Example: Declare and initialise a check watcher, working regardless of |
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wether multiple loops are supported or not.</p> |
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<pre> static void |
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check_cb (EV_P_ ev_timer *w, int revents) |
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{ |
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ev_check_stop (EV_A_ w); |
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} |
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ev_check check; |
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ev_check_init (&check, check_cb); |
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ev_check_start (EV_DEFAULT_ &check); |
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ev_loop (EV_DEFAULT_ 0); |
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</pre> |
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</div> |
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@ -1891,6 +1985,11 @@ defined to be <code>0</code>, then they are not.</p> |
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<dt>EV_STAT_ENABLE</dt> |
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<dd> |
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<p>If undefined or defined to be <code>1</code>, then stat watchers are supported. If |
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defined to be <code>0</code>, then they are not.</p> |
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</dd> |
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<dt>EV_FORK_ENABLE</dt> |
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<dd> |
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<p>If undefined or defined to be <code>1</code>, then fork watchers are supported. If |
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defined to be <code>0</code>, then they are not.</p> |
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</dd> |
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<dt>EV_MINIMAL</dt> |
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Marc Alexander Lehmann
15 years ago