<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `src/libcore/../stdsimd/crates/core_arch/src/wasm32/atomic.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>atomic.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../../../../../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../../../../../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../../../../../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../../../../../../light1.35.0.css" id="themeStyle"><script src="../../../../../../../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../../../../../../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../../../../../../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../../../../../../../down-arrow1.35.0.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../../../../../../core/index.html'><img src='../../../../../../../../rust-logo1.35.0.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../../../../../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../../../../../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../../../../../../../settings.html"><img src="../../../../../../../../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! Intrinsics associated with WebAssembly's upcoming threads proposal.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! These intrinsics are all unstable because they're not actually stable in</span>
<span class="doccomment">//! WebAssembly itself yet. The signatures may change as [the</span>
<span class="doccomment">//! specification][spec] is updated.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [spec]: https://github.com/WebAssembly/threads</span>
<span class="attribute">#![<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_feature</span> <span class="op">=</span> <span class="string">"atomics"</span>, <span class="ident">dox</span>))]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">use</span> <span class="ident">stdsimd_test</span>::<span class="ident">assert_instr</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">use</span> <span class="ident">wasm_bindgen_test</span>::<span class="ident">wasm_bindgen_test</span>;
<span class="kw">extern</span> <span class="string">"C"</span> {
<span class="attribute">#[<span class="ident">link_name</span> <span class="op">=</span> <span class="string">"llvm.wasm.atomic.wait.i32"</span>]</span>
<span class="kw">fn</span> <span class="ident">llvm_atomic_wait_i32</span>(<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">i32</span>, <span class="ident">exp</span>: <span class="ident">i32</span>, <span class="ident">timeout</span>: <span class="ident">i64</span>) <span class="op">-></span> <span class="ident">i32</span>;
<span class="attribute">#[<span class="ident">link_name</span> <span class="op">=</span> <span class="string">"llvm.wasm.atomic.wait.i64"</span>]</span>
<span class="kw">fn</span> <span class="ident">llvm_atomic_wait_i64</span>(<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">i64</span>, <span class="ident">exp</span>: <span class="ident">i64</span>, <span class="ident">timeout</span>: <span class="ident">i64</span>) <span class="op">-></span> <span class="ident">i32</span>;
<span class="attribute">#[<span class="ident">link_name</span> <span class="op">=</span> <span class="string">"llvm.wasm.atomic.notify"</span>]</span>
<span class="kw">fn</span> <span class="ident">llvm_atomic_notify</span>(<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">i32</span>, <span class="ident">cnt</span>: <span class="ident">i32</span>) <span class="op">-></span> <span class="ident">i32</span>;
}
<span class="doccomment">/// Corresponding intrinsic to wasm's [`i32.atomic.wait` instruction][instr]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function, when called, will block the current thread if the memory</span>
<span class="doccomment">/// pointed to by `ptr` is equal to `expression` (performing this action</span>
<span class="doccomment">/// atomically).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The argument `timeout_ns` is a maxinum number of nanoseconds the calling</span>
<span class="doccomment">/// thread will be blocked for, if it blocks. If the timeout is negative then</span>
<span class="doccomment">/// the calling thread will be blocked forever.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The calling thread can only be woken up with a call to the `wake` intrinsic</span>
<span class="doccomment">/// once it has been blocked. Changing the memory behind `ptr` will not wake</span>
<span class="doccomment">/// the thread once it's blocked.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Return value</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * 0 - indicates that the thread blocked and then was woken up</span>
<span class="doccomment">/// * 1 - the loaded value from `ptr` didn't match `expression`, the thread</span>
<span class="doccomment">/// didn't block</span>
<span class="doccomment">/// * 2 - the thread blocked, but the timeout expired.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Availability</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This intrinsic is only available **when the standard library itself is</span>
<span class="doccomment">/// compiled with the `atomics` target feature**. This version of the standard</span>
<span class="doccomment">/// library is not obtainable via `rustup`, but rather will require the</span>
<span class="doccomment">/// standard library to be compiled from source.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [instr]: https://github.com/WebAssembly/threads/blob/master/proposals/threads/Overview.md#wait</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">test</span>, <span class="ident">assert_instr</span>(<span class="string">"i32.atomic.wait"</span>))]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">i32_atomic_wait</span>(<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">i32</span>, <span class="ident">expression</span>: <span class="ident">i32</span>, <span class="ident">timeout_ns</span>: <span class="ident">i64</span>) <span class="op">-></span> <span class="ident">i32</span> {
<span class="ident">llvm_atomic_wait_i32</span>(<span class="ident">ptr</span>, <span class="ident">expression</span>, <span class="ident">timeout_ns</span>)
}
<span class="doccomment">/// Corresponding intrinsic to wasm's [`i64.atomic.wait` instruction][instr]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function, when called, will block the current thread if the memory</span>
<span class="doccomment">/// pointed to by `ptr` is equal to `expression` (performing this action</span>
<span class="doccomment">/// atomically).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The argument `timeout_ns` is a maxinum number of nanoseconds the calling</span>
<span class="doccomment">/// thread will be blocked for, if it blocks. If the timeout is negative then</span>
<span class="doccomment">/// the calling thread will be blocked forever.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The calling thread can only be woken up with a call to the `wake` intrinsic</span>
<span class="doccomment">/// once it has been blocked. Changing the memory behind `ptr` will not wake</span>
<span class="doccomment">/// the thread once it's blocked.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Return value</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * 0 - indicates that the thread blocked and then was woken up</span>
<span class="doccomment">/// * 1 - the loaded value from `ptr` didn't match `expression`, the thread</span>
<span class="doccomment">/// didn't block</span>
<span class="doccomment">/// * 2 - the thread blocked, but the timeout expired.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Availability</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This intrinsic is only available **when the standard library itself is</span>
<span class="doccomment">/// compiled with the `atomics` target feature**. This version of the standard</span>
<span class="doccomment">/// library is not obtainable via `rustup`, but rather will require the</span>
<span class="doccomment">/// standard library to be compiled from source.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [instr]: https://github.com/WebAssembly/threads/blob/master/proposals/threads/Overview.md#wait</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">test</span>, <span class="ident">assert_instr</span>(<span class="string">"i64.atomic.wait"</span>))]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">i64_atomic_wait</span>(<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">i64</span>, <span class="ident">expression</span>: <span class="ident">i64</span>, <span class="ident">timeout_ns</span>: <span class="ident">i64</span>) <span class="op">-></span> <span class="ident">i32</span> {
<span class="ident">llvm_atomic_wait_i64</span>(<span class="ident">ptr</span>, <span class="ident">expression</span>, <span class="ident">timeout_ns</span>)
}
<span class="doccomment">/// Corresponding intrinsic to wasm's [`atomic.notify` instruction][instr]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will notify a number of threads blocked on the address</span>
<span class="doccomment">/// indicated by `ptr`. Threads previously blocked with the `i32_atomic_wait`</span>
<span class="doccomment">/// and `i64_atomic_wait` functions above will be woken up.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `waiters` argument indicates how many waiters should be woken up (a</span>
<span class="doccomment">/// maximum). If the value is zero no waiters are woken up.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Return value</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns the number of waiters which were actually notified.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Availability</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This intrinsic is only available **when the standard library itself is</span>
<span class="doccomment">/// compiled with the `atomics` target feature**. This version of the standard</span>
<span class="doccomment">/// library is not obtainable via `rustup`, but rather will require the</span>
<span class="doccomment">/// standard library to be compiled from source.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [instr]: https://github.com/WebAssembly/threads/blob/master/proposals/threads/Overview.md#wake</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">test</span>, <span class="ident">assert_instr</span>(<span class="string">"atomic.wake"</span>))]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">atomic_notify</span>(<span class="ident">ptr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">i32</span>, <span class="ident">waiters</span>: <span class="ident">u32</span>) <span class="op">-></span> <span class="ident">u32</span> {
<span class="ident">llvm_atomic_notify</span>(<span class="ident">ptr</span>, <span class="ident">waiters</span> <span class="kw">as</span> <span class="ident">i32</span>) <span class="kw">as</span> <span class="ident">u32</span>
}
</pre></div>
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