<main><divclass="width-limiter"><navclass="sub"><formclass="search-form"><span></span><divid="sidebar-button"tabindex="-1"><ahref="../../once_cell/all.html"title="show sidebar"></a></div><inputclass="search-input"name="search"aria-label="Run search in the documentation"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"><divid="help-button"tabindex="-1"><ahref="../../help.html"title="help">?</a></div><divid="settings-menu"tabindex="-1"><ahref="../../settings.html"title="settings"><imgwidth="22"height="22"alt="Change settings"src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><sectionid="main-content"class="content"><divclass="main-heading"><h1>Module <ahref="../index.html">once_cell</a>::<wbr><aclass="mod"href="#">race</a><buttonid="copy-path"title="Copy item path to clipboard"><imgsrc="../../static.files/clipboard-7571035ce49a181d.svg"width="19"height="18"alt="Copy item path"></button></h1><spanclass="out-of-band"><aclass="src"href="../../src/once_cell/race.rs.html#1-419">source</a> · <buttonid="toggle-all-docs"title="collapse all docs">[<span>−</span>]</button></span></div><detailsclass="toggle top-doc"open><summaryclass="hideme"><span>Expand description</span></summary><divclass="docblock"><p>Thread-safe, non-blocking, “first one wins” flavor of <code>OnceCell</code>.</p>
<p>If two threads race to initialize a type from the <code>race</code> module, they
don’t block, execute initialization function together, but only one of
them stores the result.</p>
<p>This module does not require <code>std</code> feature.</p>
<ahref="https://doc.rust-lang.org/1.77.1/core/sync/atomic/enum.Ordering.html"title="enum core::sync::atomic::Ordering">atomic orderings</a> for all their operations. While this is not
</div></details><h2id="structs"class="section-header">Structs<ahref="#structs"class="anchor">§</a></h2><ulclass="item-table"><li><divclass="item-name"><aclass="struct"href="struct.OnceBool.html"title="struct once_cell::race::OnceBool">OnceBool</a></div><divclass="desc docblock-short">A thread-safe cell which can be written to only once.</div></li><li><divclass="item-name"><aclass="struct"href="struct.OnceBox.html"title="struct once_cell::race::OnceBox">OnceBox</a></div><divclass="desc docblock-short">A thread-safe cell which can be written to only once.</div></li><li><divclass="item-name"><aclass="struct"href="struct.OnceNonZeroUsize.html"title="struct once_cell::race::OnceNonZeroUsize">OnceNonZeroUsize</a></div><divclass="desc docblock-short">A thread-safe cell which can be written to only once.</div></li><li><divclass="item-name"><aclass="struct"href="struct.OnceRef.html"title="struct once_cell::race::OnceRef">OnceRef</a></div><divclass="desc docblock-short">A thread-safe cell which can be written to only once.</div></li></ul></section></div></main></body></html>
