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+<title>Job.parallel_for — Ludic</title>
+<meta name="description" content="Run work(i, ctx) for every i in [0, count) across all cores; returns when every call is done.">
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+<header class="nav"><div class="wrap nav-in"><a class="brand" href="index.html"><span class="logo">L</span> Ludic</a><button class="nav-toggle" aria-label="Toggle menu" aria-expanded="false">☰</button><nav class="nav-links"><a href="index.html">Home</a><a href="api.html">API Reference</a><a class="nav-cta" href="https://git.workshopsoft.io/workshopsoft/ludic">Source ↗</a></nav></div></header>
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+  <div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="ns-job.html">Job</a> <span>›</span> <span class="here">Job.parallel_for</span></div>
+  <div class="item-head">
+    <span class="kind-badge kind-method">method</span>
+    <h1 id="top">Job.parallel_for</h1>
+  </div>
+  <code class="sig">Job.parallel_for(count, work, ctx) -&gt; void</code>
+  <div class="desc"><p>Run <code>work(i, ctx)</code> for every <code>i</code> in <code>[0, count)</code> on real OS threads, and return when every call has
+finished. The indices are split into chunks shared by a worker pool (one thread per core but one,
+started on first use) and the calling thread, so each index runs exactly once, in no particular order.</p><p><code>work</code> is a top-level function taking <code>(i: int, ctx)</code>, named with <code>fn</code>; <code>ctx</code> is whatever it computes
+on (<code>words</code>, <code>bytes</code> or a <code>pointer</code>). A worker computes on what it was handed and writes only its own
+index's results: it must not <code>spawn</code>, <code>despawn</code>, <code>push</code> onto a list another thread can see, or use
+Http or Audio. <code>spawn</code> and <code>despawn</code> on a worker stop the program with a located message. Shared
+counters go through <code>Sync.add</code>, shared totals behind a <code>Sync.mutex</code>.</p></div>
+  
+  <div class="examples"><h2>Example</h2><pre data-lang="ludic">program Squares {
+  function square(i: int, out: words) -&gt; void { out[i] = i * i }
+
+  entry {
+    let sq = words(20000)
+    Job.parallel_for(20000, fn square, sq)
+    print(sq[141])
+  }
+}</pre></div>
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