<!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 `libstd/sys/unix/thread.rs`."> <meta name="keywords" content="rust, rustlang, rust-lang"> <title>thread.rs.html -- source</title> <link rel="stylesheet" type="text/css" href="../../../../normalize.css"> <link rel="stylesheet" type="text/css" href="../../../../rustdoc.css" id="mainThemeStyle"> <link rel="stylesheet" type="text/css" href="../../../../dark.css"> <link rel="stylesheet" type="text/css" href="../../../../main.css" id="themeStyle"> <script src="../../../../storage.js"></script> <link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"> </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='../../../../std/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a> </nav> <div class="theme-picker"> <button id="theme-picker" aria-label="Pick another theme!"> <img src="../../../../brush.svg" width="18" alt="Pick another theme!"> </button> <div id="theme-choices"></div> </div> <script src="../../../../theme.js"></script> <nav class="sub"> <form class="search-form js-only"> <div class="search-container"> <input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"> </div> </form> </nav> <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> <span id="2"> 2</span> <span id="3"> 3</span> <span id="4"> 4</span> <span id="5"> 5</span> <span id="6"> 6</span> <span id="7"> 7</span> <span id="8"> 8</span> <span id="9"> 9</span> <span id="10"> 10</span> <span id="11"> 11</span> <span 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id="397">397</span> <span id="398">398</span> <span id="399">399</span> <span id="400">400</span> <span id="401">401</span> <span id="402">402</span> <span id="403">403</span> <span id="404">404</span> <span id="405">405</span> <span id="406">406</span> <span id="407">407</span> <span id="408">408</span> <span id="409">409</span> <span id="410">410</span> <span id="411">411</span> <span id="412">412</span> <span id="413">413</span> <span id="414">414</span> <span id="415">415</span> <span id="416">416</span> <span id="417">417</span> <span id="418">418</span> <span id="419">419</span> <span id="420">420</span> </pre><pre class="rust "> <span class="comment">// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span> <span class="comment">// file at the top-level directory of this distribution and at</span> <span class="comment">// http://rust-lang.org/COPYRIGHT.</span> <span class="comment">//</span> <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> <span class="comment">// option. This file may not be copied, modified, or distributed</span> <span class="comment">// except according to those terms.</span> <span class="kw">use</span> <span class="ident">alloc</span>::<span class="ident">boxed</span>::<span class="ident">FnBox</span>; <span class="kw">use</span> <span class="ident">cmp</span>; <span class="kw">use</span> <span class="ident">ffi</span>::<span class="ident">CStr</span>; <span class="kw">use</span> <span class="ident">io</span>; <span class="kw">use</span> <span class="ident">libc</span>; <span class="kw">use</span> <span class="ident">mem</span>; <span class="kw">use</span> <span class="ident">ptr</span>; <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">os</span>; <span class="kw">use</span> <span class="ident">time</span>::<span class="ident">Duration</span>; <span class="kw">use</span> <span class="ident">sys_common</span>::<span class="ident">thread</span>::<span class="kw-2">*</span>; <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"l4re"</span>))]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">DEFAULT_MIN_STACK_SIZE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">2</span> <span class="op">*</span> <span class="number">1024</span> <span class="op">*</span> <span class="number">1024</span>; <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"l4re"</span>)]</span> <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">DEFAULT_MIN_STACK_SIZE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">1024</span> <span class="op">*</span> <span class="number">1024</span>; <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Thread</span> { <span class="ident">id</span>: <span class="ident">libc</span>::<span class="ident">pthread_t</span>, } <span class="comment">// Some platforms may have pthread_t as a pointer in which case we still want</span> <span class="comment">// a thread to be Send/Sync</span> <span class="kw">unsafe</span> <span class="kw">impl</span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Thread</span> {} <span class="kw">unsafe</span> <span class="kw">impl</span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Thread</span> {} <span class="comment">// The pthread_attr_setstacksize symbol doesn't exist in the emscripten libc,</span> <span class="comment">// so we have to not link to it to satisfy emcc's ERROR_ON_UNDEFINED_SYMBOLS.</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>))]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">pthread_attr_setstacksize</span>(<span class="ident">attr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">pthread_attr_t</span>, <span class="ident">stack_size</span>: <span class="ident">libc</span>::<span class="ident">size_t</span>) <span class="op">-></span> <span class="ident">libc</span>::<span class="ident">c_int</span> { <span class="ident">libc</span>::<span class="ident">pthread_attr_setstacksize</span>(<span class="ident">attr</span>, <span class="ident">stack_size</span>) } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">pthread_attr_setstacksize</span>(<span class="ident">_attr</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">pthread_attr_t</span>, <span class="ident">_stack_size</span>: <span class="ident">libc</span>::<span class="ident">size_t</span>) <span class="op">-></span> <span class="ident">libc</span>::<span class="ident">c_int</span> { <span class="macro">panic</span><span class="macro">!</span>() } <span class="kw">impl</span> <span class="ident">Thread</span> { <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="ident">stack</span>: <span class="ident">usize</span>, <span class="ident">p</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">FnBox</span>() <span class="op">+</span> <span class="lifetime">'a</span><span class="op">></span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Thread</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">p</span> <span class="op">=</span> <span class="kw">box</span> <span class="ident">p</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">native</span>: <span class="ident">libc</span>::<span class="ident">pthread_t</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">zeroed</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">attr</span>: <span class="ident">libc</span>::<span class="ident">pthread_attr_t</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">zeroed</span>(); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">libc</span>::<span class="ident">pthread_attr_init</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>), <span class="number">0</span>); <span class="kw">let</span> <span class="ident">stack_size</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">max</span>(<span class="ident">stack</span>, <span class="ident">min_stack_size</span>(<span class="kw-2">&</span><span class="ident">attr</span>)); <span class="kw">match</span> <span class="ident">pthread_attr_setstacksize</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>, <span class="ident">stack_size</span>) { <span class="number">0</span> <span class="op">=></span> {} <span class="ident">n</span> <span class="op">=></span> { <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">n</span>, <span class="ident">libc</span>::<span class="ident">EINVAL</span>); <span class="comment">// EINVAL means |stack_size| is either too small or not a</span> <span class="comment">// multiple of the system page size. Because it's definitely</span> <span class="comment">// >= PTHREAD_STACK_MIN, it must be an alignment issue.</span> <span class="comment">// Round up to the nearest page and try again.</span> <span class="kw">let</span> <span class="ident">page_size</span> <span class="op">=</span> <span class="ident">os</span>::<span class="ident">page_size</span>(); <span class="kw">let</span> <span class="ident">stack_size</span> <span class="op">=</span> (<span class="ident">stack_size</span> <span class="op">+</span> <span class="ident">page_size</span> <span class="op">-</span> <span class="number">1</span>) <span class="op">&</span> (<span class="op">-</span>(<span class="ident">page_size</span> <span class="kw">as</span> <span class="ident">isize</span> <span class="op">-</span> <span class="number">1</span>) <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> <span class="number">1</span>); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">libc</span>::<span class="ident">pthread_attr_setstacksize</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>, <span class="ident">stack_size</span>), <span class="number">0</span>); } }; <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_create</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">native</span>, <span class="kw-2">&</span><span class="ident">attr</span>, <span class="ident">thread_start</span>, <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">p</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> _ <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">libc</span>::<span class="ident">pthread_attr_destroy</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>), <span class="number">0</span>); <span class="kw">return</span> <span class="kw">if</span> <span class="ident">ret</span> <span class="op">!=</span> <span class="number">0</span> { <span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">from_raw_os_error</span>(<span class="ident">ret</span>)) } <span class="kw">else</span> { <span class="ident">mem</span>::<span class="ident">forget</span>(<span class="ident">p</span>); <span class="comment">// ownership passed to pthread_create</span> <span class="prelude-val">Ok</span>(<span class="ident">Thread</span> { <span class="ident">id</span>: <span class="ident">native</span> }) }; <span class="kw">extern</span> <span class="kw">fn</span> <span class="ident">thread_start</span>(<span class="ident">main</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">c_void</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">c_void</span> { <span class="kw">unsafe</span> { <span class="ident">start_thread</span>(<span class="ident">main</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>); } <span class="ident">ptr</span>::<span class="ident">null_mut</span>() } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">yield_now</span>() { <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">sched_yield</span>() }; <span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">ret</span>, <span class="number">0</span>); } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>))]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_name</span>(<span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">CStr</span>) { <span class="kw">const</span> <span class="ident">PR_SET_NAME</span>: <span class="ident">libc</span>::<span class="ident">c_int</span> <span class="op">=</span> <span class="number">15</span>; <span class="comment">// pthread wrapper only appeared in glibc 2.12, so we use syscall</span> <span class="comment">// directly.</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">prctl</span>(<span class="ident">PR_SET_NAME</span>, <span class="ident">name</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_ulong</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>); } } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"dragonfly"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"bitrig"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"openbsd"</span>))]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_name</span>(<span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">CStr</span>) { <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">pthread_set_name_np</span>(<span class="ident">libc</span>::<span class="ident">pthread_self</span>(), <span class="ident">name</span>.<span class="ident">as_ptr</span>()); } } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"ios"</span>))]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_name</span>(<span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">CStr</span>) { <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">pthread_setname_np</span>(<span class="ident">name</span>.<span class="ident">as_ptr</span>()); } } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_name</span>(<span class="ident">name</span>: <span class="kw-2">&</span><span class="ident">CStr</span>) { <span class="kw">use</span> <span class="ident">ffi</span>::<span class="ident">CString</span>; <span class="kw">let</span> <span class="ident">cname</span> <span class="op">=</span> <span class="ident">CString</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b"%s"</span>[..]).<span class="ident">unwrap</span>(); <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">pthread_setname_np</span>(<span class="ident">libc</span>::<span class="ident">pthread_self</span>(), <span class="ident">cname</span>.<span class="ident">as_ptr</span>(), <span class="ident">name</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">c_void</span>); } } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_env</span> <span class="op">=</span> <span class="string">"newlib"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"solaris"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"haiku"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"l4re"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>))]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_name</span>(<span class="ident">_name</span>: <span class="kw-2">&</span><span class="ident">CStr</span>) { <span class="comment">// Newlib, Illumos, Haiku, and Emscripten have no way to set a thread name.</span> } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"fuchsia"</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_name</span>(<span class="ident">_name</span>: <span class="kw-2">&</span><span class="ident">CStr</span>) { <span class="comment">// FIXME: determine whether Fuchsia has a way to set a thread name.</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sleep</span>(<span class="ident">dur</span>: <span class="ident">Duration</span>) { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">secs</span> <span class="op">=</span> <span class="ident">dur</span>.<span class="ident">as_secs</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">nsecs</span> <span class="op">=</span> <span class="ident">dur</span>.<span class="ident">subsec_nanos</span>() <span class="kw">as</span> _; <span class="comment">// If we're awoken with a signal then the return value will be -1 and</span> <span class="comment">// nanosleep will fill in `ts` with the remaining time.</span> <span class="kw">unsafe</span> { <span class="kw">while</span> <span class="ident">secs</span> <span class="op">></span> <span class="number">0</span> <span class="op">||</span> <span class="ident">nsecs</span> <span class="op">></span> <span class="number">0</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ts</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">timespec</span> { <span class="ident">tv_sec</span>: <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">libc</span>::<span class="ident">time_t</span>::<span class="ident">max_value</span>() <span class="kw">as</span> <span class="ident">u64</span>, <span class="ident">secs</span>) <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">time_t</span>, <span class="ident">tv_nsec</span>: <span class="ident">nsecs</span>, }; <span class="ident">secs</span> <span class="op">-=</span> <span class="ident">ts</span>.<span class="ident">tv_sec</span> <span class="kw">as</span> <span class="ident">u64</span>; <span class="kw">if</span> <span class="ident">libc</span>::<span class="ident">nanosleep</span>(<span class="kw-2">&</span><span class="ident">ts</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">ts</span>) <span class="op">==</span> <span class="op">-</span><span class="number">1</span> { <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">os</span>::<span class="ident">errno</span>(), <span class="ident">libc</span>::<span class="ident">EINTR</span>); <span class="ident">secs</span> <span class="op">+=</span> <span class="ident">ts</span>.<span class="ident">tv_sec</span> <span class="kw">as</span> <span class="ident">u64</span>; <span class="ident">nsecs</span> <span class="op">=</span> <span class="ident">ts</span>.<span class="ident">tv_nsec</span>; } <span class="kw">else</span> { <span class="ident">nsecs</span> <span class="op">=</span> <span class="number">0</span>; } } } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">join</span>(<span class="self">self</span>) { <span class="kw">unsafe</span> { <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_join</span>(<span class="self">self</span>.<span class="ident">id</span>, <span class="ident">ptr</span>::<span class="ident">null_mut</span>()); <span class="ident">mem</span>::<span class="ident">forget</span>(<span class="self">self</span>); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ret</span> <span class="op">==</span> <span class="number">0</span>, <span class="string">"failed to join thread: {}"</span>, <span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">from_raw_os_error</span>(<span class="ident">ret</span>)); } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">id</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">libc</span>::<span class="ident">pthread_t</span> { <span class="self">self</span>.<span class="ident">id</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_id</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">libc</span>::<span class="ident">pthread_t</span> { <span class="kw">let</span> <span class="ident">id</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">id</span>; <span class="ident">mem</span>::<span class="ident">forget</span>(<span class="self">self</span>); <span class="ident">id</span> } } <span class="kw">impl</span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Thread</span> { <span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">pthread_detach</span>(<span class="self">self</span>.<span class="ident">id</span>) }; <span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">ret</span>, <span class="number">0</span>); } } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">all</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">not</span>(<span class="ident">target_env</span> <span class="op">=</span> <span class="string">"musl"</span>))), <span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>), <span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>), <span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"bitrig"</span>), <span class="ident">not</span>(<span class="ident">all</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>, <span class="ident">not</span>(<span class="ident">target_vendor</span> <span class="op">=</span> <span class="string">"rumprun"</span>))), <span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"openbsd"</span>), <span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"solaris"</span>)))]</span> <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">test</span>, <span class="ident">allow</span>(<span class="ident">dead_code</span>))]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">guard</span> { <span class="kw">use</span> <span class="ident">ops</span>::<span class="ident">Range</span>; <span class="kw">pub</span> <span class="kw">type</span> <span class="ident">Guard</span> <span class="op">=</span> <span class="ident">Range</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>; <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">current</span>() <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Guard</span><span class="op">></span> { <span class="prelude-val">None</span> } <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">init</span>() <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Guard</span><span class="op">></span> { <span class="prelude-val">None</span> } } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">all</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">not</span>(<span class="ident">target_env</span> <span class="op">=</span> <span class="string">"musl"</span>)), <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"bitrig"</span>, <span class="ident">all</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>, <span class="ident">not</span>(<span class="ident">target_vendor</span> <span class="op">=</span> <span class="string">"rumprun"</span>)), <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"openbsd"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"solaris"</span>))]</span> <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">test</span>, <span class="ident">allow</span>(<span class="ident">dead_code</span>))]</span> <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">guard</span> { <span class="kw">use</span> <span class="ident">libc</span>; <span class="kw">use</span> <span class="ident">libc</span>::<span class="ident">mmap</span>; <span class="kw">use</span> <span class="ident">libc</span>::{<span class="ident">PROT_NONE</span>, <span class="ident">MAP_PRIVATE</span>, <span class="ident">MAP_ANON</span>, <span class="ident">MAP_FAILED</span>, <span class="ident">MAP_FIXED</span>}; <span class="kw">use</span> <span class="ident">ops</span>::<span class="ident">Range</span>; <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">os</span>; <span class="comment">// This is initialized in init() and only read from after</span> <span class="kw">static</span> <span class="kw-2">mut</span> <span class="ident">PAGE_SIZE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0</span>; <span class="kw">pub</span> <span class="kw">type</span> <span class="ident">Guard</span> <span class="op">=</span> <span class="ident">Range</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>; <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"solaris"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_stack_start</span>() <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">c_void</span><span class="op">></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">current_stack</span>: <span class="ident">libc</span>::<span class="ident">stack_t</span> <span class="op">=</span> ::<span class="ident">mem</span>::<span class="ident">zeroed</span>(); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">libc</span>::<span class="ident">stack_getbounds</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">current_stack</span>), <span class="number">0</span>); <span class="prelude-val">Some</span>(<span class="ident">current_stack</span>.<span class="ident">ss_sp</span>) } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_stack_start</span>() <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">c_void</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">stackaddr</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_get_stackaddr_np</span>(<span class="ident">libc</span>::<span class="ident">pthread_self</span>()) <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> <span class="ident">libc</span>::<span class="ident">pthread_get_stacksize_np</span>(<span class="ident">libc</span>::<span class="ident">pthread_self</span>()); <span class="prelude-val">Some</span>(<span class="ident">stackaddr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">c_void</span>) } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"openbsd"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"bitrig"</span>))]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_stack_start</span>() <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">c_void</span><span class="op">></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">current_stack</span>: <span class="ident">libc</span>::<span class="ident">stack_t</span> <span class="op">=</span> ::<span class="ident">mem</span>::<span class="ident">zeroed</span>(); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">libc</span>::<span class="ident">pthread_stackseg_np</span>(<span class="ident">libc</span>::<span class="ident">pthread_self</span>(), <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">current_stack</span>), <span class="number">0</span>); <span class="kw">let</span> <span class="ident">extra</span> <span class="op">=</span> <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"bitrig"</span>) {<span class="number">3</span>} <span class="kw">else</span> {<span class="number">1</span>} <span class="op">*</span> <span class="ident">PAGE_SIZE</span>; <span class="kw">let</span> <span class="ident">stackaddr</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">libc</span>::<span class="ident">pthread_main_np</span>() <span class="op">==</span> <span class="number">1</span> { <span class="comment">// main thread</span> <span class="ident">current_stack</span>.<span class="ident">ss_sp</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> <span class="ident">current_stack</span>.<span class="ident">ss_size</span> <span class="op">+</span> <span class="ident">extra</span> } <span class="kw">else</span> { <span class="comment">// new thread</span> <span class="ident">current_stack</span>.<span class="ident">ss_sp</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">-</span> <span class="ident">current_stack</span>.<span class="ident">ss_size</span> }; <span class="prelude-val">Some</span>(<span class="ident">stackaddr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">c_void</span>) } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"l4re"</span>))]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">get_stack_start</span>() <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">c_void</span><span class="op">></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ret</span> <span class="op">=</span> <span class="prelude-val">None</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">attr</span>: <span class="ident">libc</span>::<span class="ident">pthread_attr_t</span> <span class="op">=</span> ::<span class="ident">mem</span>::<span class="ident">zeroed</span>(); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">libc</span>::<span class="ident">pthread_attr_init</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>), <span class="number">0</span>); <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>)]</span> <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_attr_get_np</span>(<span class="ident">libc</span>::<span class="ident">pthread_self</span>(), <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>); <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>))]</span> <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_getattr_np</span>(<span class="ident">libc</span>::<span class="ident">pthread_self</span>(), <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>); <span class="kw">if</span> <span class="ident">e</span> <span class="op">==</span> <span class="number">0</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">stackaddr</span> <span class="op">=</span> ::<span class="ident">ptr</span>::<span class="ident">null_mut</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">stacksize</span> <span class="op">=</span> <span class="number">0</span>; <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">libc</span>::<span class="ident">pthread_attr_getstack</span>(<span class="kw-2">&</span><span class="ident">attr</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">stackaddr</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">stacksize</span>), <span class="number">0</span>); <span class="ident">ret</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">stackaddr</span>); } <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">libc</span>::<span class="ident">pthread_attr_destroy</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>), <span class="number">0</span>); <span class="ident">ret</span> } <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">init</span>() <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Guard</span><span class="op">></span> { <span class="ident">PAGE_SIZE</span> <span class="op">=</span> <span class="ident">os</span>::<span class="ident">page_size</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">stackaddr</span> <span class="op">=</span> <span class="ident">get_stack_start</span>()<span class="question-mark">?</span>; <span class="comment">// Ensure stackaddr is page aligned! A parent process might</span> <span class="comment">// have reset RLIMIT_STACK to be non-page aligned. The</span> <span class="comment">// pthread_attr_getstack() reports the usable stack area</span> <span class="comment">// stackaddr < stackaddr + stacksize, so if stackaddr is not</span> <span class="comment">// page-aligned, calculate the fix such that stackaddr <</span> <span class="comment">// new_page_aligned_stackaddr < stackaddr + stacksize</span> <span class="kw">let</span> <span class="ident">remainder</span> <span class="op">=</span> (<span class="ident">stackaddr</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">%</span> <span class="ident">PAGE_SIZE</span>; <span class="kw">if</span> <span class="ident">remainder</span> <span class="op">!=</span> <span class="number">0</span> { <span class="ident">stackaddr</span> <span class="op">=</span> ((<span class="ident">stackaddr</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op">+</span> <span class="ident">PAGE_SIZE</span> <span class="op">-</span> <span class="ident">remainder</span>) <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">c_void</span>; } <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>) { <span class="comment">// Linux doesn't allocate the whole stack right away, and</span> <span class="comment">// the kernel has its own stack-guard mechanism to fault</span> <span class="comment">// when growing too close to an existing mapping. If we map</span> <span class="comment">// our own guard, then the kernel starts enforcing a rather</span> <span class="comment">// large gap above that, rendering much of the possible</span> <span class="comment">// stack space useless. See #43052.</span> <span class="comment">//</span> <span class="comment">// Instead, we'll just note where we expect rlimit to start</span> <span class="comment">// faulting, so our handler can report "stack overflow", and</span> <span class="comment">// trust that the kernel's own stack guard will work.</span> <span class="kw">let</span> <span class="ident">stackaddr</span> <span class="op">=</span> <span class="ident">stackaddr</span> <span class="kw">as</span> <span class="ident">usize</span>; <span class="prelude-val">Some</span>(<span class="ident">stackaddr</span> <span class="op">-</span> <span class="ident">PAGE_SIZE</span>..<span class="ident">stackaddr</span>) } <span class="kw">else</span> { <span class="comment">// Reallocate the last page of the stack.</span> <span class="comment">// This ensures SIGBUS will be raised on</span> <span class="comment">// stack overflow.</span> <span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">mmap</span>(<span class="ident">stackaddr</span>, <span class="ident">PAGE_SIZE</span>, <span class="ident">PROT_NONE</span>, <span class="ident">MAP_PRIVATE</span> <span class="op">|</span> <span class="ident">MAP_ANON</span> <span class="op">|</span> <span class="ident">MAP_FIXED</span>, <span class="op">-</span><span class="number">1</span>, <span class="number">0</span>); <span class="kw">if</span> <span class="ident">result</span> <span class="op">!=</span> <span class="ident">stackaddr</span> <span class="op">||</span> <span class="ident">result</span> <span class="op">==</span> <span class="ident">MAP_FAILED</span> { <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"failed to allocate a guard page"</span>); } <span class="kw">let</span> <span class="ident">guardaddr</span> <span class="op">=</span> <span class="ident">stackaddr</span> <span class="kw">as</span> <span class="ident">usize</span>; <span class="kw">let</span> <span class="ident">offset</span> <span class="op">=</span> <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>) { <span class="number">2</span> } <span class="kw">else</span> { <span class="number">1</span> }; <span class="prelude-val">Some</span>(<span class="ident">guardaddr</span>..<span class="ident">guardaddr</span> <span class="op">+</span> <span class="ident">offset</span> <span class="op">*</span> <span class="ident">PAGE_SIZE</span>) } } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"bitrig"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"openbsd"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"solaris"</span>))]</span> <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">current</span>() <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Guard</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">stackaddr</span> <span class="op">=</span> <span class="ident">get_stack_start</span>()<span class="question-mark">?</span> <span class="kw">as</span> <span class="ident">usize</span>; <span class="prelude-val">Some</span>(<span class="ident">stackaddr</span> <span class="op">-</span> <span class="ident">PAGE_SIZE</span>..<span class="ident">stackaddr</span>) } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"l4re"</span>))]</span> <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">current</span>() <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Guard</span><span class="op">></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ret</span> <span class="op">=</span> <span class="prelude-val">None</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">attr</span>: <span class="ident">libc</span>::<span class="ident">pthread_attr_t</span> <span class="op">=</span> ::<span class="ident">mem</span>::<span class="ident">zeroed</span>(); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">libc</span>::<span class="ident">pthread_attr_init</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>), <span class="number">0</span>); <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>)]</span> <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_attr_get_np</span>(<span class="ident">libc</span>::<span class="ident">pthread_self</span>(), <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>); <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>))]</span> <span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_getattr_np</span>(<span class="ident">libc</span>::<span class="ident">pthread_self</span>(), <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>); <span class="kw">if</span> <span class="ident">e</span> <span class="op">==</span> <span class="number">0</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">guardsize</span> <span class="op">=</span> <span class="number">0</span>; <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">libc</span>::<span class="ident">pthread_attr_getguardsize</span>(<span class="kw-2">&</span><span class="ident">attr</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">guardsize</span>), <span class="number">0</span>); <span class="kw">if</span> <span class="ident">guardsize</span> <span class="op">==</span> <span class="number">0</span> { <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"there is no guard page"</span>); } <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">stackaddr</span> <span class="op">=</span> ::<span class="ident">ptr</span>::<span class="ident">null_mut</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">size</span> <span class="op">=</span> <span class="number">0</span>; <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">libc</span>::<span class="ident">pthread_attr_getstack</span>(<span class="kw-2">&</span><span class="ident">attr</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">stackaddr</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">size</span>), <span class="number">0</span>); <span class="kw">let</span> <span class="ident">stackaddr</span> <span class="op">=</span> <span class="ident">stackaddr</span> <span class="kw">as</span> <span class="ident">usize</span>; <span class="ident">ret</span> <span class="op">=</span> <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"freebsd"</span>) { <span class="comment">// FIXME does freebsd really fault *below* the guard addr?</span> <span class="kw">let</span> <span class="ident">guardaddr</span> <span class="op">=</span> <span class="ident">stackaddr</span> <span class="op">-</span> <span class="ident">guardsize</span>; <span class="prelude-val">Some</span>(<span class="ident">guardaddr</span> <span class="op">-</span> <span class="ident">PAGE_SIZE</span>..<span class="ident">guardaddr</span>) } <span class="kw">else</span> <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>) { <span class="prelude-val">Some</span>(<span class="ident">stackaddr</span> <span class="op">-</span> <span class="ident">guardsize</span>..<span class="ident">stackaddr</span>) } <span class="kw">else</span> <span class="kw">if</span> <span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">all</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>, <span class="ident">target_env</span> <span class="op">=</span> <span class="string">"gnu"</span>)) { <span class="comment">// glibc used to include the guard area within the stack, as noted in the BUGS</span> <span class="comment">// section of `man pthread_attr_getguardsize`. This has been corrected starting</span> <span class="comment">// with glibc 2.27, and in some distro backports, so the guard is now placed at the</span> <span class="comment">// end (below) the stack. There's no easy way for us to know which we have at</span> <span class="comment">// runtime, so we'll just match any fault in the range right above or below the</span> <span class="comment">// stack base to call that fault a stack overflow.</span> <span class="prelude-val">Some</span>(<span class="ident">stackaddr</span> <span class="op">-</span> <span class="ident">guardsize</span>..<span class="ident">stackaddr</span> <span class="op">+</span> <span class="ident">guardsize</span>) } <span class="kw">else</span> { <span class="prelude-val">Some</span>(<span class="ident">stackaddr</span>..<span class="ident">stackaddr</span> <span class="op">+</span> <span class="ident">guardsize</span>) }; } <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">libc</span>::<span class="ident">pthread_attr_destroy</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>), <span class="number">0</span>); <span class="ident">ret</span> } } <span class="comment">// glibc >= 2.15 has a __pthread_get_minstack() function that returns</span> <span class="comment">// PTHREAD_STACK_MIN plus however many bytes are needed for thread-local</span> <span class="comment">// storage. We need that information to avoid blowing up when a small stack</span> <span class="comment">// is created in an application with big thread-local storage requirements.</span> <span class="comment">// See #6233 for rationale and details.</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>)]</span> <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span> <span class="kw">fn</span> <span class="ident">min_stack_size</span>(<span class="ident">attr</span>: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">pthread_attr_t</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="macro">weak</span><span class="macro">!</span>(<span class="kw">fn</span> <span class="ident">__pthread_get_minstack</span>(<span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">pthread_attr_t</span>) <span class="op">-></span> <span class="ident">libc</span>::<span class="ident">size_t</span>); <span class="kw">match</span> <span class="ident">__pthread_get_minstack</span>.<span class="ident">get</span>() { <span class="prelude-val">None</span> <span class="op">=></span> <span class="ident">libc</span>::<span class="ident">PTHREAD_STACK_MIN</span>, <span class="prelude-val">Some</span>(<span class="ident">f</span>) <span class="op">=></span> <span class="kw">unsafe</span> { <span class="ident">f</span>(<span class="ident">attr</span>) }, } } <span class="comment">// No point in looking up __pthread_get_minstack() on non-glibc</span> <span class="comment">// platforms.</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"linux"</span>), <span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>)))]</span> <span class="kw">fn</span> <span class="ident">min_stack_size</span>(_: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">pthread_attr_t</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="ident">libc</span>::<span class="ident">PTHREAD_STACK_MIN</span> } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>)]</span> <span class="kw">fn</span> <span class="ident">min_stack_size</span>(_: <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">libc</span>::<span class="ident">pthread_attr_t</span>) <span class="op">-></span> <span class="ident">usize</span> { <span class="number">2048</span> <span class="comment">// just a guess</span> } </pre> </section> <section id='search' class="content hidden"></section> <section class="footer"></section> <aside id="help" class="hidden"> <div> <h1 class="hidden">Help</h1> <div class="shortcuts"> <h2>Keyboard Shortcuts</h2> <dl> <dt><kbd>?</kbd></dt> <dd>Show this help dialog</dd> <dt><kbd>S</kbd></dt> <dd>Focus the search field</dd> <dt><kbd>↑</kbd></dt> <dd>Move up in search results</dd> <dt><kbd>↓</kbd></dt> <dd>Move down in search results</dd> <dt><kbd>↹</kbd></dt> <dd>Switch tab</dd> <dt><kbd>⏎</kbd></dt> <dd>Go to active search result</dd> <dt><kbd>+</kbd></dt> <dd>Expand all sections</dd> <dt><kbd>-</kbd></dt> <dd>Collapse all sections</dd> </dl> </div> <div class="infos"> <h2>Search Tricks</h2> <p> Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type. </p> <p> Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>. </p> <p> Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>) </p> </div> </div> </aside> <script> window.rootPath = "../../../../"; window.currentCrate = "std"; </script> <script src="../../../../main.js"></script> <script defer src="../../../../search-index.js"></script> </body> </html>