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<h4>Previous topic</h4>121 <p class="topless"><a href="asyncio-policy.html"122 title="previous chapter">Policies</a></p>123 </div>124 <div>125 <h4>Next topic</h4>126 <p class="topless"><a href="asyncio-extending.html"127 title="next chapter">Extending</a></p>128 </div>129 <script>130 document.addEventListener('DOMContentLoaded', () => {131 const title = document.querySelector('meta[property="og:title"]').content;132 const elements = document.querySelectorAll('.improvepage');133 const pageurl = window.location.href.split('?')[0];134 elements.forEach(element => {135 const url = new URL(element.href.split('?')[0].replace("-nojs", ""));136 url.searchParams.set('pagetitle', title);137 url.searchParams.set('pageurl', pageurl);138 url.searchParams.set('pagesource', "library/asyncio-platforms.rst");139 element.href = url.toString();140 });141 });142 </script>143 <div role="note" aria-label="source link">144 <h3>This page</h3>145 <ul class="this-page-menu">146 <li><a href="../bugs.html">Report 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search" type="search" name="q" id="search-box">200 <input type="submit" value="Go">201 </form>202 </div>203 |204 </li>205 <li class="right">206<label class="theme-selector-label">207 Theme208 <select class="theme-selector" oninput="activateTheme(this.value)">209 <option value="auto" selected>Auto</option>210 <option value="light">Light</option>211 <option value="dark">Dark</option>212 </select>213</label> |</li>214 215 </ul>216 </div> 217 218 <div class="document">219 <div class="documentwrapper">220 <div class="bodywrapper">221 <div class="body" role="main">222 223 <section id="platform-support">224<span id="asyncio-platform-support"></span><h1>Platform Support<a class="headerlink" href="#platform-support" title="Link to this heading">¶</a></h1>225<p>The <a class="reference internal" href="asyncio.html#module-asyncio" title="asyncio: Asynchronous I/O."><code class="xref py py-mod docutils literal notranslate"><span class="pre">asyncio</span></code></a> module is designed to be portable,226but some platforms have subtle differences and limitations227due to the platforms’ underlying architecture and capabilities.</p>228<section id="all-platforms">229<h2>All Platforms<a class="headerlink" href="#all-platforms" title="Link to this heading">¶</a></h2>230<ul class="simple">231<li><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.add_reader" title="asyncio.loop.add_reader"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.add_reader()</span></code></a> and <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.add_writer" title="asyncio.loop.add_writer"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.add_writer()</span></code></a>232cannot be used to monitor file I/O.</p></li>233</ul>234</section>235<section id="windows">236<h2>Windows<a class="headerlink" href="#windows" title="Link to this heading">¶</a></h2>237<p><strong>Source code:</strong> <a class="extlink-source reference external" href="https://github.com/python/cpython/tree/main/Lib/asyncio/proactor_events.py">Lib/asyncio/proactor_events.py</a>,238<a class="extlink-source reference external" href="https://github.com/python/cpython/tree/main/Lib/asyncio/windows_events.py">Lib/asyncio/windows_events.py</a>,239<a class="extlink-source reference external" href="https://github.com/python/cpython/tree/main/Lib/asyncio/windows_utils.py">Lib/asyncio/windows_utils.py</a></p>240<hr class="docutils" />241<div class="versionchanged">242<p><span class="versionmodified changed">Changed in version 3.8: </span>On Windows, <a class="reference internal" href="asyncio-eventloop.html#asyncio.ProactorEventLoop" title="asyncio.ProactorEventLoop"><code class="xref py py-class docutils literal notranslate"><span class="pre">ProactorEventLoop</span></code></a> is now the default event loop.</p>243</div>244<p>All event loops on Windows do not support the following methods:</p>245<ul class="simple">246<li><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_unix_connection" title="asyncio.loop.create_unix_connection"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_unix_connection()</span></code></a> and247<a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_unix_server" title="asyncio.loop.create_unix_server"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_unix_server()</span></code></a> are not supported.248The <a class="reference internal" href="socket.html#socket.AF_UNIX" title="socket.AF_UNIX"><code class="xref py py-const docutils literal notranslate"><span class="pre">socket.AF_UNIX</span></code></a> socket family is specific to Unix.</p></li>249<li><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.add_signal_handler" title="asyncio.loop.add_signal_handler"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.add_signal_handler()</span></code></a> and250<a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.remove_signal_handler" title="asyncio.loop.remove_signal_handler"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.remove_signal_handler()</span></code></a> are not supported.</p></li>251</ul>252<p><a class="reference internal" href="asyncio-eventloop.html#asyncio.SelectorEventLoop" title="asyncio.SelectorEventLoop"><code class="xref py py-class docutils literal notranslate"><span class="pre">SelectorEventLoop</span></code></a> has the following limitations:</p>253<ul class="simple">254<li><p><a class="reference internal" href="selectors.html#selectors.SelectSelector" title="selectors.SelectSelector"><code class="xref py py-class docutils literal notranslate"><span class="pre">SelectSelector</span></code></a> is used to wait on socket events:255it supports sockets and is limited to 512 sockets.</p></li>256<li><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.add_reader" title="asyncio.loop.add_reader"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.add_reader()</span></code></a> and <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.add_writer" title="asyncio.loop.add_writer"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.add_writer()</span></code></a> only accept257socket handles (e.g. pipe file descriptors are not supported).</p></li>258<li><p>Pipes are not supported, so the <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.connect_read_pipe" title="asyncio.loop.connect_read_pipe"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.connect_read_pipe()</span></code></a>259and <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.connect_write_pipe" title="asyncio.loop.connect_write_pipe"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.connect_write_pipe()</span></code></a> methods are not implemented.</p></li>260<li><p><a class="reference internal" href="asyncio-subprocess.html#asyncio-subprocess"><span class="std std-ref">Subprocesses</span></a> are not supported, i.e.261<a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.subprocess_exec" title="asyncio.loop.subprocess_exec"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.subprocess_exec()</span></code></a> and <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.subprocess_shell" title="asyncio.loop.subprocess_shell"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.subprocess_shell()</span></code></a>262methods are not implemented.</p></li>263</ul>264<p><a class="reference internal" href="asyncio-eventloop.html#asyncio.ProactorEventLoop" title="asyncio.ProactorEventLoop"><code class="xref py py-class docutils literal notranslate"><span class="pre">ProactorEventLoop</span></code></a> has the following limitations:</p>265<ul class="simple">266<li><p>The <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.add_reader" title="asyncio.loop.add_reader"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.add_reader()</span></code></a> and <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.add_writer" title="asyncio.loop.add_writer"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.add_writer()</span></code></a>267methods are not supported.</p></li>268</ul>269<p>The resolution of the monotonic clock on Windows is usually around 15.6270milliseconds. The best resolution is 0.5 milliseconds. The resolution depends on the271hardware (availability of <a class="reference external" href="https://en.wikipedia.org/wiki/High_Precision_Event_Timer">HPET</a>) and on the272Windows configuration.</p>273<section id="subprocess-support-on-windows">274<span id="asyncio-windows-subprocess"></span><h3>Subprocess Support on Windows<a class="headerlink" href="#subprocess-support-on-windows" title="Link to this heading">¶</a></h3>275<p>On Windows, the default event loop <a class="reference internal" href="asyncio-eventloop.html#asyncio.ProactorEventLoop" title="asyncio.ProactorEventLoop"><code class="xref py py-class docutils literal notranslate"><span class="pre">ProactorEventLoop</span></code></a> supports276subprocesses, whereas <a class="reference internal" href="asyncio-eventloop.html#asyncio.SelectorEventLoop" title="asyncio.SelectorEventLoop"><code class="xref py py-class docutils literal notranslate"><span class="pre">SelectorEventLoop</span></code></a> does not.</p>277</section>278</section>279<section id="macos">280<h2>macOS<a class="headerlink" href="#macos" title="Link to this heading">¶</a></h2>281<p>Modern macOS versions are fully supported.</p>282<p class="rubric">macOS <= 10.8</p>283<p>On macOS 10.6, 10.7 and 10.8, the default event loop284uses <a class="reference internal" href="selectors.html#selectors.KqueueSelector" title="selectors.KqueueSelector"><code class="xref py py-class docutils literal notranslate"><span class="pre">selectors.KqueueSelector</span></code></a>, which does not support285character devices on these versions. The <a class="reference internal" href="asyncio-eventloop.html#asyncio.SelectorEventLoop" title="asyncio.SelectorEventLoop"><code class="xref py py-class docutils literal notranslate"><span class="pre">SelectorEventLoop</span></code></a>286can be manually configured to use <a class="reference internal" href="selectors.html#selectors.SelectSelector" title="selectors.SelectSelector"><code class="xref py py-class docutils literal notranslate"><span class="pre">SelectSelector</span></code></a>287or <a class="reference internal" href="selectors.html#selectors.PollSelector" title="selectors.PollSelector"><code class="xref py py-class docutils literal notranslate"><span class="pre">PollSelector</span></code></a> to support character devices on288these older versions of macOS. Example:</p>289<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span><span class="w"> </span><span class="nn">asyncio</span>290<span class="kn">import</span><span class="w"> </span><span class="nn">selectors</span>291 292<span class="n">selector</span> <span class="o">=</span> <span class="n">selectors</span><span class="o">.</span><span class="n">SelectSelector</span><span class="p">()</span>293<span class="n">loop</span> <span class="o">=</span> <span class="n">asyncio</span><span class="o">.</span><span class="n">SelectorEventLoop</span><span class="p">(</span><span class="n">selector</span><span class="p">)</span>294<span class="n">asyncio</span><span class="o">.</span><span class="n">set_event_loop</span><span class="p">(</span><span class="n">loop</span><span class="p">)</span>295</pre></div>296</div>297</section>298</section>299 300 301 <div class="clearer"></div>302 </div>303 </div>304 </div>305 <div class="sphinxsidebar" role="navigation" aria-label="Main">306 <div class="sphinxsidebarwrapper">307 <div>308 <h3><a href="../contents.html">Table of Contents</a></h3>309 <ul>310<li><a class="reference internal" href="#">Platform Support</a><ul>311<li><a class="reference internal" href="#all-platforms">All Platforms</a></li>312<li><a class="reference internal" href="#windows">Windows</a><ul>313<li><a class="reference internal" href="#subprocess-support-on-windows">Subprocess Support on Windows</a></li>314</ul>315</li>316<li><a class="reference internal" href="#macos">macOS</a></li>317</ul>318</li>319</ul>320 321 </div>322 <div>323 <h4>Previous topic</h4>324 <p class="topless"><a href="asyncio-policy.html"325 title="previous chapter">Policies</a></p>326 </div>327 <div>328 <h4>Next topic</h4>329 <p class="topless"><a href="asyncio-extending.html"330 title="next chapter">Extending</a></p>331 </div>332 <script>333 document.addEventListener('DOMContentLoaded', () => {334 const title = document.querySelector('meta[property="og:title"]').content;335 const elements = document.querySelectorAll('.improvepage');336 const pageurl = window.location.href.split('?')[0];337 elements.forEach(element => {338 const url = new URL(element.href.split('?')[0].replace("-nojs", ""));339 url.searchParams.set('pagetitle', title);340 url.searchParams.set('pageurl', pageurl);341 url.searchParams.set('pagesource', "library/asyncio-platforms.rst");342 element.href = url.toString();343 });344 });345 </script>346 <div role="note" aria-label="source link">347 <h3>This page</h3>348 <ul class="this-page-menu">349 <li><a href="../bugs.html">Report a bug</a></li>350 <li><a class="improvepage" href="../improve-page-nojs.html">Improve this page</a></li>351 <li>352 <a href="https://github.com/python/cpython/blob/main/Doc/library/asyncio-platforms.rst?plain=1"353 rel="nofollow">Show source354 </a>355 </li>356 357 </ul>358 </div>359 </div>360<div id="sidebarbutton" title="Collapse sidebar">361<span>«</span>362</div>363 364 </div>365 <div class="clearer"></div>366 </div> 367 <div class="related" role="navigation" aria-label="Related">368 <h3>Navigation</h3>369 <ul>370 <li class="right" style="margin-right: 10px">371 <a href="../genindex.html" title="General Index"372 >index</a></li>373 <li class="right" >374 <a href="../py-modindex.html" title="Python Module Index"375 >modules</a> |</li>376 <li class="right" >377 <a href="asyncio-extending.html" title="Extending"378 >next</a> |</li>379 <li class="right" >380 <a href="asyncio-policy.html" title="Policies"381 >previous</a> |</li>382 383 <li><img src="../_static/py.svg" alt="Python logo" style="vertical-align: middle; 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