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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Lock (moonpool.Moonpool.Lock)</title><meta charset="utf-8"/><link rel="stylesheet" href="../../../_odoc-theme/odoc.css"/><meta name="generator" content="odoc 2.4.1"/><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">moonpool</a> » <a href="../index.html">Moonpool</a> » Lock</nav><header class="odoc-preamble"><h1>Module <code><span>Moonpool.Lock</span></code></h1><p>Mutex-protected resource.</p><ul class="at-tags"><li class="since"><span class="at-tag">since</span> 0.3</li></ul></header><div class="odoc-content"><div class="odoc-spec"><div class="spec type anchored" id="type-t"><a href="#type-t" class="anchor"></a><code><span><span class="keyword">type</span> <span>'a t</span></span></code></div><div class="spec-doc"><p>A value protected by a mutex</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-create"><a href="#val-create" class="anchor"></a><code><span><span class="keyword">val</span> create : <span><span class="type-var">'a</span> <span class="arrow">-></span></span> <span><span class="type-var">'a</span> <a href="#type-t">t</a></span></span></code></div><div class="spec-doc"><p>Create a new protected value.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-with_"><a href="#val-with_" class="anchor"></a><code><span><span class="keyword">val</span> with_ : <span><span><span class="type-var">'a</span> <a href="#type-t">t</a></span> <span class="arrow">-></span></span> <span><span>(<span><span class="type-var">'a</span> <span class="arrow">-></span></span> <span class="type-var">'b</span>)</span> <span class="arrow">-></span></span> <span class="type-var">'b</span></span></code></div><div class="spec-doc"><p><code>with_ l f</code> runs <code>f x</code> where <code>x</code> is the value protected with the lock <code>l</code>, in a critical section. If <code>f x</code> fails, <code>with_lock l f</code> fails too but the lock is released.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-update"><a href="#val-update" class="anchor"></a><code><span><span class="keyword">val</span> update : <span><span><span class="type-var">'a</span> <a href="#type-t">t</a></span> <span class="arrow">-></span></span> <span><span>(<span><span class="type-var">'a</span> <span class="arrow">-></span></span> <span class="type-var">'a</span>)</span> <span class="arrow">-></span></span> unit</span></code></div><div class="spec-doc"><p><code>update l f</code> replaces the content <code>x</code> of <code>l</code> with <code>f x</code>, while protected by the mutex.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-update_map"><a href="#val-update_map" class="anchor"></a><code><span><span class="keyword">val</span> update_map : <span><span><span class="type-var">'a</span> <a href="#type-t">t</a></span> <span class="arrow">-></span></span> <span><span>(<span><span class="type-var">'a</span> <span class="arrow">-></span></span> <span class="type-var">'a</span> * <span class="type-var">'b</span>)</span> <span class="arrow">-></span></span> <span class="type-var">'b</span></span></code></div><div class="spec-doc"><p><code>update_map l f</code> computes <code>x', y = f (get l)</code>, then puts <code>x'</code> in <code>l</code> and returns <code>y</code>, while protected by the mutex.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-mutex"><a href="#val-mutex" class="anchor"></a><code><span><span class="keyword">val</span> mutex : <span><span><span class="type-var">_</span> <a href="#type-t">t</a></span> <span class="arrow">-></span></span> <a href="../../../ocaml/Stdlib/Mutex/index.html#type-t">Stdlib.Mutex.t</a></span></code></div><div class="spec-doc"><p>Underlying mutex.</p></div></div><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><span><span class="type-var">'a</span> <a href="#type-t">t</a></span> <span class="arrow">-></span></span> <span class="type-var">'a</span></span></code></div><div class="spec-doc"><p>Atomically get the value in the lock. The value that is returned isn't protected!</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><span class="type-var">'a</span> <a href="#type-t">t</a></span> <span class="arrow">-></span></span> <span><span class="type-var">'a</span> <span class="arrow">-></span></span> unit</span></code></div><div class="spec-doc"><p>Atomically set the value.</p><p><b>NOTE</b> caution: using <a href="#val-get"><code>get</code></a> and <a href="#val-set"><code>set</code></a> as if this were a <code>ref</code> is an anti pattern and will not protect data against some race conditions.</p></div></div></div></body></html>
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