<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="Wrap a static data structure inside it so that we are able to access it without any `unsafe`."><metaname="keywords"content="rust, rustlang, rust-lang, UPSafeCell"><title>UPSafeCell in os::sync::up - Rust</title><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../../SourceSerif4-Regular.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../../FiraSans-Regular.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../../FiraSans-Medium.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../../SourceCodePro-Regular.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../../SourceSerif4-Bold.ttf.woff2"><linkrel="preload"as="font"type="font/woff2"crossoriginhref="../../../SourceCodePro-Semibold.ttf.woff2"><linkrel="stylesheet"type="text/css"href="../../../normalize.css"><linkrel="stylesheet"type="text/css"href="../../../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../../../ayu.css"disabled><linkrel="stylesheet"type="text/css"href="../../../dark.css"disabled><linkrel="stylesheet"type="text/css"href="../../../light.css"id="themeStyle"><scriptid="default-settings"></script><scriptsrc="../../../storage.js"></script><scriptsrc="../../../crates.js"></script><scriptdefersrc="../../../main.js"></script>
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</a><h2class="location"><ahref="#">Struct UPSafeCell</a></h2><divclass="sidebar-elems"><divclass="block items"><h3class="sidebar-title"><ahref="#fields">Fields</a></h3><divclass="sidebar-links"><ahref="#structfield.inner">inner</a></div><h3class="sidebar-title"><ahref="#implementations">Methods</a></h3><divclass="sidebar-links"><ahref="#method.exclusive_access">exclusive_access</a><ahref="#method.new">new</a></div><h3class="sidebar-title"><ahref="#trait-implementations">Trait Implementations</a></h3><divclass="sidebar-links"><ahref="#impl-Sync">Sync</a></div><h3class="sidebar-title"><ahref="#synthetic-implementations">Auto Trait Implementations</a></h3><divclass="sidebar-links"><ahref="#impl-RefUnwindSafe">!RefUnwindSafe</a><ahref="#impl-Send">Send</a><ahref="#impl-Unpin">Unpin</a><ahref="#impl-UnwindSafe">UnwindSafe</a></div><h3class="sidebar-title"><ahref="#blanket-implementations">Blanket Implementations</a></h3><divclass="sidebar-links"><ahref="#impl-Any">Any</a><ahref="#impl-Borrow%3CT%3E">Borrow<T></a><ahref="#impl-BorrowMut%3CT%3E">BorrowMut<T></a><ahref="#impl-From%3CT%3E">From<T></a><ahref="#impl-Into%3CU%3E">Into<U></a><ahref="#impl-TryFrom%3CU%3E">TryFrom<U></a><ahref="#impl-TryInto%3CU%3E">TryInto<U></a></div></div><h2class="location">Other items in<br><ahref="../../index.html">os</a>::<wbr><ahref="../index.html">sync</a>::<wbr><ahref="index.html">up</a></h2><divid="sidebar-vars"data-name="UPSafeCell"data-ty="struct"data-relpath=""></div><scriptdefersrc="sidebar-items.js"></script></div></nav><main><divclass="width-limiter"><divclass="sub-container"><aclass="sub-logo-container"href="../../../os/index.html"><imgclass="rust-logo"src="../../../rust-logo.svg"alt="logo"></a><navclass="sub"><divclass="theme-picker hidden"><buttonid="theme-picker"aria-label="Pick another theme!"aria-haspopup="menu"title="themes"><imgwidth="18"height="18"alt="Pick another theme!"src="../../../brush.svg"></button><divid="theme-choices"role="menu"></div></div><formclass="search-form"><divclass="search-container"><div>
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}</code></pre></div><detailsclass="rustdoc-toggle top-doc"open><summaryclass="hideme"><span>Expand description</span></summary><divclass="docblock"><p>Wrap a static data structure inside it so that we are
able to access it without any <code>unsafe</code>.</p>
<p>We should only use it in uniprocessor.</p>
<p>In order to get mutable reference of inner data, call
</div><h2id="implementations"class="small-section-header">Implementations<ahref="#implementations"class="anchor"></a></h2><detailsclass="rustdoc-toggle implementors-toggle"open><summary><divid="impl"class="impl has-srclink"><divclass="rightside"><aclass="srclink"href="../../../src/os/sync/up.rs.html#19-31"title="goto source code">source</a></div><ahref="#impl"class="anchor"></a><h3class="code-header in-band">impl<T><aclass="struct"href="struct.UPSafeCell.html"title="struct os::sync::up::UPSafeCell">UPSafeCell</a><T></h3></div></summary><divclass="impl-items"><detailsclass="rustdoc-toggle method-toggle"open><summary><divid="method.new"class="method has-srclink"><divclass="rightside"><aclass="srclink"href="../../../src/os/sync/up.rs.html#22-26"title="goto source code">source</a></div><ahref="#method.new"class="anchor"></a><h4class="code-header">pub unsafe fn <ahref="#method.new"class="fnname">new</a>(value: T) -> Self</h4></div></summary><divclass="docblock"><p>User is responsible to guarantee that inner struct is only used in
</div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><divid="method.exclusive_access"class="method has-srclink"><divclass="rightside"><aclass="srclink"href="../../../src/os/sync/up.rs.html#28-30"title="goto source code">source</a></div><ahref="#method.exclusive_access"class="anchor"></a><h4class="code-header">pub fn <ahref="#method.exclusive_access"class="fnname">exclusive_access</a>(&self) -><aclass="struct"href="https://doc.rust-lang.org/nightly/core/cell/struct.RefMut.html"title="struct core::cell::RefMut">RefMut</a><'_, T></h4></div></summary><divclass="docblock"><p>Exclusive access inner data in UPSafeCell. Panic if the data has been borrowed.</p>
</div></details></div></details><h2id="trait-implementations"class="small-section-header">Trait Implementations<ahref="#trait-implementations"class="anchor"></a></h2><divid="trait-implementations-list"><divid="impl-Sync"class="impl has-srclink"><divclass="rightside"><aclass="srclink"href="../../../src/os/sync/up.rs.html#17"title="goto source code">source</a></div><ahref="#impl-Sync"class="anchor"></a><h3class="code-header in-band">impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html"title="trait core::marker::Sync">Sync</a> for <aclass="struct"href="struct.UPSafeCell.html"title="struct os::sync::up::UPSafeCell">UPSafeCell</a><T></h3></div></div><h2id="synthetic-implementations"class="small-section-header">Auto Trait Implementations<ahref="#synthetic-implementations"class="anchor"></a></h2><divid="synthetic-implementations-list"><divid="impl-RefUnwindSafe"class="impl has-srclink"><divclass="rightside"></div><ahref="#impl-RefUnwindSafe"class="anchor"></a><h3class="code-header in-band">impl<T> !<aclass="trait"href="https://doc.rust-lang.org/nightly/core/panic/unwind_safe/trait.RefUnwindSafe.html"title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <aclass="struct"href="struct.UPSafeCell.html"title="struct os::sync::up::UPSafeCell">UPSafeCell</a><T></h3></div><divid="impl-Send"class="impl has-srclink"><divclass="rightside"></div><ahref="#impl-Send"class="anchor"></a><h3class="code-header in-band">impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html"title="trait core::marker::Send">Send</a> for <aclass="struct"href="struct.UPSafeCell.html"title="struct os::sync::up::UPSafeCell">UPSafeCell</a><T><spanclass="where fmt-newline">where<br> T: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html"title="trait core::marker::Send">Send</a>, </span></h3></div><divid="impl-Unpin"class="impl has-srclink"><divclass="rightside"></div><ahref="#impl-Unpin"class="anchor"></a><h3class="code-header in-band">impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html"title="trait core::marker::Unpin">Unpin</a> for <aclass="struct"href="struct.UPSafeCell.html"title="struct os::sync::up::UPSafeCell">UPSafeCell</a><T><spanclass="where fmt-newline">where<br> T: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html"title="trait core::marker::Unpin">Unpin</a>, </span></h3></div><divid="impl-UnwindSafe"class="impl has-srclink"><divclass="rightside"></div><ahref="#impl-UnwindSafe"class="anchor"></a><h3class="code-header in-band">impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/panic/unwind_safe/trait.UnwindSafe.html"title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <aclass="struct"href="struct.UPSafeCell.html"title="struct os::sync::up::UPSafeCell">UPSafeCell</a><T><spanclass="where fmt-newline">where<br> T: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/panic/unwind_safe/trait.UnwindSafe.html"title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>, </span></h3></div></div><h2id="blanket-implementations"class="small-section-header">Blanket Implementations<ahref="#blanket-implementations"class="anchor"></a></h2><divid="blanket-implementations-list"><detailsclass="rustdoc-toggle implementors-toggle"open><summary><divid="impl-Any"class="impl has-srclink"><divclass="rightside"><aclass="srclink"href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#132-136"title="goto source code">source</a></div><ahref="#impl-Any"class="anchor"></a><h3class="code-header in-band">impl<T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html"title="trait core::any::Any">Any</a> for T <spanclass="where fmt-newline">where<br> &n
</div></details></div></details><detailsclass="rustdoc-toggle implementors-toggle"open><summary><divid="impl-Into%3CU%3E"class="impl has-srclink"><divclass="rightside"><aclass="srclink"href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#537-544"title="goto source code">source</a></div><ahref="#impl-Into%3CU%3E"class="anchor"></a><h3class="code-header in-band">impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html"title="trait core::convert::From">From</a><T>, </span></h3></div></summary><divclass="impl-items"><detailsclass="rustdoc-toggle method-toggle"open><summary><divid="method.into"class="method trait-impl has-srclink"><divclass="rightside"><aclass="srclink"href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#541"title="goto source code">source</a></div><ahref="#method.into"class="anchor"></a><h4class="code-header">pub fn <ahref="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html#tymethod.into"class="fnname">into</a>(self) -> U</h4></div></summary><divclass='docblock'><p>Performs the conversion.</p>
</div></details></div></details><detailsclass="rustdoc-toggle implementors-toggle"open><summary><divid="impl-TryFrom%3CU%3E"class="impl has-srclink"><divclass="rightside"><aclass="srclink"href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#589-598"title="goto source code">source</a></div><ahref="#impl-TryFrom%3CU%3E"class="anchor"></a><h3class="code-header in-band">impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html"title="trait core::convert::Into">Into</a><T>, </span></h3></div></summary><divclass="impl-items"><detailsclass="rustdoc-toggle"open><summary><divid="associatedtype.Error-1"class="type trait-impl has-srclink"><ahref="#associatedtype.Error-1"class="anchor"></a><h4class="code-header">type <ahref="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"class="associatedtype">Error</a> = <aclass="enum"href="https://doc.rust-lang.org/nightly/core/convert/enum.Infallible.html"title="enum core::convert::Infallible">Infallible</a></h4></div></summary><divclass='docblock'><p>The type returned in the event of a conversion error.</p>
</div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><divid="method.try_from"class="method trait-impl has-srclink"><divclass="rightside"><aclass="srclink"href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#595"title="goto source code">source</a></div><ahref="#method.try_from"class="anchor"></a><h4class="code-header">pub fn <ahref="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from"class="fnname">try_from</a>(value: U) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><T, <T as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><U>>::<aclass="associatedtype"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></h4></div></summary><divclass='docblock'><p>Performs the conversion.</p>
</div></details></div></details><detailsclass="rustdoc-toggle implementors-toggle"open><summary><divid="impl-TryInto%3CU%3E"class="impl has-srclink"><divclass="rightside"><aclass="srclink"href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#574-583"title="goto source code">source</a></div><ahref="#impl-TryInto%3CU%3E"class="anchor"></a><h3class="code-header in-band">impl<T, U><aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html"title="trait core::convert::TryInto">TryInto</a><U> for T <spanclass="where fmt-newline">where<br> U: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>, </span></h3></div></summary><divclass="impl-items"><detailsclass="rustdoc-toggle"open><summary><divid="associatedtype.Error"class="type trait-impl has-srclink"><ahref="#associatedtype.Error"class="anchor"></a><h4class="code-header">type <ahref="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error"class="associatedtype">Error</a> = <U as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="associatedtype"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a></h4></div></summary><divclass='docblock'><p>The type returned in the event of a conversion error.</p>
</div></details><detailsclass="rustdoc-toggle method-toggle"open><summary><divid="method.try_into"class="method trait-impl has-srclink"><divclass="rightside"><aclass="srclink"href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#580"title="goto source code">source</a></div><ahref="#method.try_into"class="anchor"></a><h4class="code-header">pub fn <ahref="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into"class="fnname">try_into</a>(self) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><U, <U as <aclass="trait"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html"title="trait core::convert::TryFrom">TryFrom</a><T>>::<aclass="associatedtype"href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error"title="type core::convert::TryFrom::Error">Error</a>></h4></div></summary><divclass='docblock'><p>Performs the conversion.</p>
