1073 lines
31 KiB
HTML
1073 lines
31 KiB
HTML
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<!doctype html>
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<html lang="en" class="no-js">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<meta name="description" content="A C++20 Kahn Process Network library">
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<link rel="prev" href="../network/">
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<link rel="next" href="../error-handling/">
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<link rel="icon" href="../assets/images/favicon.png">
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<meta name="generator" content="mkdocs-1.6.1, mkdocs-material-9.7.6">
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<title>Channels - KPN++</title>
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<link rel="stylesheet" href="../assets/stylesheets/main.484c7ddc.min.css">
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback">
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<style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style>
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<script>__md_scope=new URL("..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script>
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</head>
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<body dir="ltr" data-md-color-scheme="slate" data-md-color-primary="indigo" data-md-color-accent="indigo">
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<a href="#channels" class="md-skip">
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Skip to content
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<header class="md-header" data-md-component="header">
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<nav class="md-header__inner md-grid" aria-label="Header">
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<a href=".." title="KPN++" class="md-header__button md-logo" aria-label="KPN++" data-md-component="logo">
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KPN++
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<div class="md-header__topic" data-md-component="header-topic">
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<span class="md-ellipsis">
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Channels
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<form class="md-header__option" data-md-component="palette">
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<input class="md-option" data-md-color-media="" data-md-color-scheme="slate" data-md-color-primary="indigo" data-md-color-accent="indigo" aria-hidden="true" type="radio" name="__palette" id="__palette_0">
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<script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script>
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<div class="md-header__source">
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<a href="https://gitea.tourolle.paris/dtourolle/KPN" title="Go to repository" class="md-source" data-md-component="source">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M439.6 236.1 244 40.5c-5.4-5.5-12.8-8.5-20.4-8.5s-15 3-20.4 8.4L162.5 81l51.5 51.5c27.1-9.1 52.7 16.8 43.4 43.7l49.7 49.7c34.2-11.8 61.2 31 35.5 56.7-26.5 26.5-70.2-2.9-56-37.3L240.3 199v121.9c25.3 12.5 22.3 41.8 9.1 55-6.4 6.4-15.2 10.1-24.3 10.1s-17.8-3.6-24.3-10.1c-17.6-17.6-11.1-46.9 11.2-56v-123c-20.8-8.5-24.6-30.7-18.6-45L142.6 101 8.5 235.1C3 240.6 0 247.9 0 255.5s3 15 8.5 20.4l195.6 195.7c5.4 5.4 12.7 8.4 20.4 8.4s15-3 20.4-8.4l194.7-194.7c5.4-5.4 8.4-12.8 8.4-20.4s-3-15-8.4-20.4"/></svg>
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</div>
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<div class="md-source__repository">
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dtourolle/KPN
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</a>
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</nav>
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</header>
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<div class="md-container" data-md-component="container">
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<nav class="md-tabs" aria-label="Tabs" data-md-component="tabs">
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<div class="md-grid">
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<li class="md-tabs__item">
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<a href=".." class="md-tabs__link">
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Home
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<li class="md-tabs__item">
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<a href="../getting-started/" class="md-tabs__link">
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Getting Started
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</a>
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<li class="md-tabs__item md-tabs__item--active">
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<a href="../nodes/" class="md-tabs__link">
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Concepts
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</a>
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</li>
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<li class="md-tabs__item">
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<a href="../error-handling/" class="md-tabs__link">
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Error Handling & Events
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</a>
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<li class="md-tabs__item">
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<a href="../static-network/" class="md-tabs__link">
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Advanced
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<li class="md-tabs__item">
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<a href="../examples/" class="md-tabs__link">
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Examples
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</a>
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</ul>
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</nav>
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<main class="md-main" data-md-component="main">
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<nav class="md-nav md-nav--primary md-nav--lifted" aria-label="Navigation" data-md-level="0">
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<a href=".." title="KPN++" class="md-nav__button md-logo" aria-label="KPN++" data-md-component="logo">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg>
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KPN++
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<div class="md-nav__source">
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<a href="https://gitea.tourolle.paris/dtourolle/KPN" title="Go to repository" class="md-source" data-md-component="source">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M439.6 236.1 244 40.5c-5.4-5.5-12.8-8.5-20.4-8.5s-15 3-20.4 8.4L162.5 81l51.5 51.5c27.1-9.1 52.7 16.8 43.4 43.7l49.7 49.7c34.2-11.8 61.2 31 35.5 56.7-26.5 26.5-70.2-2.9-56-37.3L240.3 199v121.9c25.3 12.5 22.3 41.8 9.1 55-6.4 6.4-15.2 10.1-24.3 10.1s-17.8-3.6-24.3-10.1c-17.6-17.6-11.1-46.9 11.2-56v-123c-20.8-8.5-24.6-30.7-18.6-45L142.6 101 8.5 235.1C3 240.6 0 247.9 0 255.5s3 15 8.5 20.4l195.6 195.7c5.4 5.4 12.7 8.4 20.4 8.4s15-3 20.4-8.4l194.7-194.7c5.4-5.4 8.4-12.8 8.4-20.4s-3-15-8.4-20.4"/></svg>
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<div class="md-source__repository">
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dtourolle/KPN
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Home
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Getting Started
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Concepts
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Concepts
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Nodes
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<li class="md-nav__item">
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Networks
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Channels
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<h1 id="channels">Channels<a class="headerlink" href="#channels" title="Permanent link">¶</a></h1>
|
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<p>A <code>Channel<T></code> is a lock-free SPSC (single-producer, single-consumer) ring buffer with atomic wait/notify.</p>
|
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<h2 id="semantics">Semantics<a class="headerlink" href="#semantics" title="Permanent link">¶</a></h2>
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<ul>
|
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<li><strong>Bounded</strong>: fixed capacity set at construction. Default is 5 items.</li>
|
|
<li><strong>Backpressure</strong>: when full, <code>push()</code> throws <code>ChannelOverflowError</code> immediately — no blocking, no spin.</li>
|
|
<li><strong>Blocking consumer</strong>: <code>pop()</code> blocks until an item is available or the channel is disabled.</li>
|
|
<li><strong>Disable</strong>: <code>channel.disable()</code> stops accepting pushes and unblocks any waiting <code>pop()</code> with <code>ChannelClosedError</code>.</li>
|
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</ul>
|
|
<h2 id="storage-policy">Storage policy<a class="headerlink" href="#storage-policy" title="Permanent link">¶</a></h2>
|
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<p>Small trivially-copyable types (≤ 8 bytes) are stored by value. Larger types are heap-allocated and passed via <code>shared_ptr<const T></code> — one allocation per push, zero-copy fan-out:</p>
|
|
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="c1">// Override: store Tag by value despite being a struct</span>
|
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</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="c1">// (it's trivially copyable and small — this just makes the policy explicit)</span>
|
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</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="k">template</span><span class="o"><></span>
|
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</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="k">struct</span><span class="w"> </span><span class="nc">kpn</span><span class="o">::</span><span class="n">channel_storage_policy</span><span class="o"><</span><span class="n">Tag</span><span class="o">></span><span class="w"> </span><span class="p">{</span>
|
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</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="w"> </span><span class="k">static</span><span class="w"> </span><span class="k">constexpr</span><span class="w"> </span><span class="kt">bool</span><span class="w"> </span><span class="n">by_value</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">true</span><span class="p">;</span>
|
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</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="p">};</span>
|
|
</span></code></pre></div>
|
|
<p>Specialize <code>kpn::ChannelDataSize<T></code> for accurate bandwidth reporting on heap-owning types:</p>
|
|
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="k">template</span><span class="o"><></span>
|
|
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="k">struct</span><span class="w"> </span><span class="nc">kpn</span><span class="o">::</span><span class="n">ChannelDataSize</span><span class="o"><</span><span class="n">cv</span><span class="o">::</span><span class="n">Mat</span><span class="o">></span><span class="w"> </span><span class="p">{</span>
|
|
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="w"> </span><span class="k">static</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="kt">size_t</span><span class="w"> </span><span class="nf">bytes</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">cv</span><span class="o">::</span><span class="n">Mat</span><span class="o">&</span><span class="w"> </span><span class="n">m</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">m</span><span class="p">.</span><span class="n">total</span><span class="p">()</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">m</span><span class="p">.</span><span class="n">elemSize</span><span class="p">();</span><span class="w"> </span><span class="p">}</span>
|
|
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="p">};</span>
|
|
</span></code></pre></div>
|
|
<h2 id="named-ports">Named ports<a class="headerlink" href="#named-ports" title="Permanent link">¶</a></h2>
|
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<p><code>in<"name"></code> and <code>out<"name"></code> tag nodes for readable wiring:</p>
|
|
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="w"> </span><span class="c1">// tokenise: no inputs, one named output "words"</span>
|
|
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">tok</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">make_node</span><span class="o"><</span><span class="n">tokenise</span><span class="o">></span><span class="p">(</span><span class="n">out</span><span class="o"><</span><span class="s">"words"</span><span class="o">></span><span class="p">{},</span><span class="w"> </span><span class="mi">4</span><span class="p">);</span>
|
|
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a>
|
|
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w"> </span><span class="c1">// count_words: named input "words", named outputs "count" and "words"</span>
|
|
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">cnt</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">make_node</span><span class="o"><</span><span class="n">count_words</span><span class="o">></span><span class="p">(</span><span class="n">in</span><span class="o"><</span><span class="s">"words"</span><span class="o">></span><span class="p">{},</span><span class="w"> </span><span class="n">out</span><span class="o"><</span><span class="s">"count"</span><span class="p">,</span><span class="w"> </span><span class="s">"words"</span><span class="o">></span><span class="p">{},</span><span class="w"> </span><span class="mi">4</span><span class="p">);</span>
|
|
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a>
|
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</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="w"> </span><span class="c1">// report: two named inputs</span>
|
|
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="w"> </span><span class="k">auto</span><span class="w"> </span><span class="n">snk</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">make_node</span><span class="o"><</span><span class="n">report</span><span class="o">></span><span class="p">(</span><span class="n">in</span><span class="o"><</span><span class="s">"count"</span><span class="p">,</span><span class="w"> </span><span class="s">"words"</span><span class="o">></span><span class="p">{},</span><span class="w"> </span><span class="mi">4</span><span class="p">);</span>
|
|
</span></code></pre></div>
|
|
<p>Named ports are checked at compile time — a typo in a port name is a compile error.</p>
|
|
<h2 id="capacity-tuning">Capacity tuning<a class="headerlink" href="#capacity-tuning" title="Permanent link">¶</a></h2>
|
|
<p>Set capacity per node at construction:</p>
|
|
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="k">auto</span><span class="w"> </span><span class="n">node</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">make_node</span><span class="o"><</span><span class="n">my_func</span><span class="o">></span><span class="p">(</span><span class="cm">/*capacity=*/</span><span class="mi">20</span><span class="p">);</span>
|
|
</span></code></pre></div>
|
|
<p>Capacity is rounded up internally to the next power of two. Monitor fill levels via diagnostics to tune for your workload — a too-small capacity causes overflows; a too-large one wastes memory and hides producer/consumer speed mismatches.</p>
|
|
<h2 id="spin-count">Spin count<a class="headerlink" href="#spin-count" title="Permanent link">¶</a></h2>
|
|
<p><code>Channel</code> spins for up to ~4 µs (200 <code>pause</code> hints at ~20 ns each on x86) before sleeping on a futex. Set to 0 for power-constrained or predominantly-idle pipelines:</p>
|
|
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="n">Channel</span><span class="o"><</span><span class="kt">int</span><span class="o">></span><span class="w"> </span><span class="n">ch</span><span class="p">(</span><span class="cm">/*capacity=*/</span><span class="mi">5</span><span class="p">,</span><span class="w"> </span><span class="cm">/*spin_count=*/</span><span class="mi">0</span><span class="p">);</span>
|
|
</span></code></pre></div>
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