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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Lwt_engine (lwt.Lwt_engine)</title><meta charset="utf-8"/><link rel="stylesheet" href="../../_odoc-theme/odoc.css"/><meta name="generator" content="odoc 3.1.0"/><meta name="viewport" content="width=device-width,initial-scale=1.0"/><script src="../../highlight.pack.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body class="odoc"><nav class="odoc-nav"><a href="../index.html">Up</a> – <a href="../../index.html">Index</a> &#x00BB; <a href="../index.html">lwt</a> &#x00BB; Lwt_engine</nav><header class="odoc-preamble"><h1>Module <code><span>Lwt_engine</span></code></h1><p>Lwt unix main loop engine</p></header><div class="odoc-tocs"><nav class="odoc-toc odoc-local-toc"><ul><li><a href="#events">Events</a></li><li><a href="#event-loop-functions">Event loop functions</a></li><li><a href="#engines">Engines</a></li><li><a href="#predefined-engines">Predefined engines</a></li><li><a href="#the-current-engine">The current engine</a></li></ul></nav></div><div class="odoc-content"><h3 id="events"><a href="#events" class="anchor"></a>Events</h3><div class="odoc-spec"><div class="spec type anchored" id="type-event"><a href="#type-event" class="anchor"></a><code><span><span class="keyword">type</span> event</span></code></div><div class="spec-doc"><p>Type of events. An event represent a callback registered to be called when some event occurs.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-stop_event"><a href="#val-stop_event" class="anchor"></a><code><span><span class="keyword">val</span> stop_event : <span><a href="#type-event">event</a> <span class="arrow">&#45;&gt;</span></span> unit</span></code></div><div class="spec-doc"><p><code>stop_event event</code> stops the given event.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-fake_event"><a href="#val-fake_event" class="anchor"></a><code><span><span class="keyword">val</span> fake_event : <a href="#type-event">event</a></span></code></div><div class="spec-doc"><p>Event which does nothing when stopped.</p></div></div><h3 id="event-loop-functions"><a href="#event-loop-functions" class="anchor"></a>Event loop functions</h3><div class="odoc-spec"><div class="spec value anchored" id="val-iter"><a href="#val-iter" class="anchor"></a><code><span><span class="keyword">val</span> iter : <span>bool <span class="arrow">&#45;&gt;</span></span> unit</span></code></div><div class="spec-doc"><p><code>iter block</code> performs one iteration of the main loop. If <code>block</code> is <code>true</code> the function must block until one event becomes available, otherwise it should just check for available events and return immediately.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-on_readable"><a href="#val-on_readable" class="anchor"></a><code><span><span class="keyword">val</span> on_readable : <span><a href="../../ocaml/Unix/index.html#type-file_descr">Unix.file_descr</a> <span class="arrow">&#45;&gt;</span></span> <span><span>(<span><a href="#type-event">event</a> <span class="arrow">&#45;&gt;</span></span> unit)</span> <span class="arrow">&#45;&gt;</span></span> <a href="#type-event">event</a></span></code></div><div class="spec-doc"><p><code>on_readable fd f</code> calls <code>f</code> each time <code>fd</code> becomes readable.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-on_writable"><a href="#val-on_writable" class="anchor"></a><code><span><span class="keyword">val</span> on_writable : <span><a href="../../ocaml/Unix/index.html#type-file_descr">Unix.file_descr</a> <span class="arrow">&#45;&gt;</span></span> <span><span>(<span><a href="#type-event">event</a> <span class="arrow">&#45;&gt;</span></span> unit)</span> <span class="arrow">&#45;&gt;</span></span> <a href="#type-event">event</a></span></code></div><div class="spec-doc"><p><code>on_readable fd f</code> calls <code>f</code> each time <code>fd</code> becomes writable.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-on_timer"><a href="#val-on_timer" class="anchor"></a><code><span><span class="keyword">val</span> on_timer : <span>float <span class="arrow">&#45;&gt;</span></span> <span>bool <span class="arrow">&#45;&gt;</span></span> <span><span>(<span><a href="#type-event">event</a> <span class="arrow">&#45;&gt;</span></span> unit)</span> <span class="arrow">&#45;&gt;</span></span> <a href="#type-event">event</a></span></code></div><div class="spec-doc"><p><code>on_timer delay repeat f</code> calls <code>f</code> one time after <code>delay</code> seconds. If <code>repeat</code> is <code>true</code> then <code>f</code> is called each <code>delay</code> seconds, otherwise it is called only one time.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-readable_count"><a href="#val-readable_count" class="anchor"></a><code><span><span class="keyword">val</span> readable_count : <span>unit <span class="arrow">&#45;&gt;</span></span> int</span></code></div><div class="spec-doc"><p>Returns the number of events waiting for a file descriptor to become readable.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-writable_count"><a href="#val-writable_count" class="anchor"></a><code><span><span class="keyword">val</span> writable_count : <span>unit <span class="arrow">&#45;&gt;</span></span> int</span></code></div><div class="spec-doc"><p>Returns the number of events waiting for a file descriptor to become writable.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-timer_count"><a href="#val-timer_count" class="anchor"></a><code><span><span class="keyword">val</span> timer_count : <span>unit <span class="arrow">&#45;&gt;</span></span> int</span></code></div><div class="spec-doc"><p>Returns the number of registered timers.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-fake_io"><a href="#val-fake_io" class="anchor"></a><code><span><span class="keyword">val</span> fake_io : <span><a href="../../ocaml/Unix/index.html#type-file_descr">Unix.file_descr</a> <span class="arrow">&#45;&gt;</span></span> unit</span></code></div><div class="spec-doc"><p>Simulates activity on the given file descriptor.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-fork"><a href="#val-fork" class="anchor"></a><code><span><span class="keyword">val</span> fork : <span>unit <span class="arrow">&#45;&gt;</span></span> unit</span></code></div><div class="spec-doc"><p>Called internally by Lwt_unix.fork to make sure we don't get strange behaviour</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-forwards_signal"><a href="#val-forwards_signal" class="anchor"></a><code><span><span class="keyword">val</span> forwards_signal : <span>int <span class="arrow">&#45;&gt;</span></span> bool</span></code></div><div class="spec-doc"><p><code>forwards_signal signum</code> is <code>true</code> if the engine will call <a href="../Lwt_unix/index.html#val-handle_signal"><code>Lwt_unix.handle_signal</code></a> when signal <code>signum</code> occurs. In this case, Lwt will not install its own signal handler.</p><p>Normally, this just returns <code>false</code>, but when Lwt is used in combination with other IO libraries, this allows sharing e.g. the SIGCHLD handler.</p></div></div><h3 id="engines"><a href="#engines" class="anchor"></a>Engines</h3><p>An engine represents a set of functions used to register different kinds of callbacks for different kinds of events.</p><div class="odoc-spec"><div class="spec class anchored" id="class-abstract"><a href="#class-abstract" class="anchor"></a><code><span><span class="keyword">class</span> <span class="keyword">virtual</span> </span><span><a href="class-abstract/index.html">abstract</a></span><span> : <span class="keyword">object</span> ... <span class="keyword">end</span></span></code></div><div class="spec-doc"><p>Abstract class for engines.</p></div></div><div class="odoc-spec"><div class="spec class-type anchored" id="class-type-t"><a href="#class-type-t" class="anchor"></a><code><span><span class="keyword">class</span> <span class="keyword">type</span> </span><span><a href="class-type-t/index.html">t</a></span><span> = <span class="keyword">object</span> ... <span class="keyword">end</span></span></code></div><div class="spec-doc"><p>Type of engines.</p></div></div><h3 id="predefined-engines"><a href="#predefined-engines" class="anchor"></a>Predefined engines</h3><div class="odoc-spec"><div class="spec type anchored" id="type-ev_loop"><a href="#type-ev_loop" class="anchor"></a><code><span><span class="keyword">type</span> ev_loop</span></code></div></div><div class="odoc-spec"><div class="spec module anchored" id="module-Ev_backend"><a href="#module-Ev_backend" class="anchor"></a><code><span><span class="keyword">module</span> <a href="Ev_backend/index.html">Ev_backend</a></span><span> : <span class="keyword">sig</span> ... <span class="keyword">end</span></span></code></div></div><p>Type of libev loops.</p><div class="odoc-spec"><div class="spec class anchored" id="class-libev"><a href="#class-libev" class="anchor"></a><code><span><span class="keyword">class</span> </span><span><a href="class-libev/index.html">libev</a></span><span> : <span><span class="optlabel">?backend</span>:<a href="Ev_backend/index.html#type-t">Ev_backend.t</a> <span class="arrow">&#45;&gt;</span></span> <span>unit <span class="arrow">&#45;&gt;</span></span> <span class="keyword">object</span> ... <span class="keyword">end</span></span></code></div><div class="spec-doc"><p>Engine based on libev. If not compiled with libev support, the creation of the class will raise <a href="../Lwt_sys/index.html#exception-Not_available"><code>Lwt_sys.Not_available</code></a>.</p></div></div><div class="odoc-spec"><div class="spec class anchored" id="class-select"><a href="#class-select" class="anchor"></a><code><span><span class="keyword">class</span> </span><span><a href="class-select/index.html">select</a></span><span> : <a href="class-type-t/index.html">t</a></span></code></div><div class="spec-doc"><p>Engine based on <a href="../../ocaml/Unix/index.html#val-select"><code>Unix.select</code></a>.</p></div></div><div class="odoc-spec"><div class="spec class anchored" id="class-select_based"><a href="#class-select_based" class="anchor"></a><code><span><span class="keyword">class</span> <span class="keyword">virtual</span> </span><span><a href="class-select_based/index.html">select_based</a></span><span> : <span class="keyword">object</span> ... <span class="keyword">end</span></span></code></div><div class="spec-doc"><p>Abstract class for engines based on a select-like function.</p></div></div><div class="odoc-spec"><div class="spec class anchored" id="class-poll_based"><a href="#class-poll_based" class="anchor"></a><code><span><span class="keyword">class</span> <span class="keyword">virtual</span> </span><span><a href="class-poll_based/index.html">poll_based</a></span><span> : <span class="keyword">object</span> ... <span class="keyword">end</span></span></code></div><div class="spec-doc"><p>Abstract class for engines based on a poll-like function.</p></div></div><h3 id="the-current-engine"><a href="#the-current-engine" class="anchor"></a>The current engine</h3><div class="odoc-spec"><div class="spec value anchored" id="val-get"><a href="#val-get" class="anchor"></a><code><span><span class="keyword">val</span> get : <span>unit <span class="arrow">&#45;&gt;</span></span> <a href="class-type-t/index.html">t</a></span></code></div><div class="spec-doc"><p><code>get ()</code> returns the engine currently in use.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-set"><a href="#val-set" class="anchor"></a><code><span><span class="keyword">val</span> set : <span><span class="optlabel">?transfer</span>:bool <span class="arrow">&#45;&gt;</span></span> <span><span class="optlabel">?destroy</span>:bool <span class="arrow">&#45;&gt;</span></span> <span><a href="class-type-t/index.html">t</a> <span class="arrow">&#45;&gt;</span></span> unit</span></code></div><div class="spec-doc"><p><code>set ?transfer ?destroy engine</code> replaces the current engine by the given one.</p><p>If <code>transfer</code> is <code>true</code> (the default) all events from the current engine are transferred to the new one.</p><p>If <code>destroy</code> is <code>true</code> (the default) then the current engine is destroyed before being replaced.</p></div></div><div class="odoc-spec"><div class="spec module anchored" id="module-Versioned"><a href="#module-Versioned" class="anchor"></a><code><span><span class="keyword">module</span> <a href="Versioned/index.html">Versioned</a></span><span> : <span class="keyword">sig</span> ... <span class="keyword">end</span></span></code></div></div></div></body></html>
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