<!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/condvar.rs`."> <meta name="keywords" content="rust, rustlang, rust-lang"> <title>condvar.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 id="12"> 12</span> <span id="13"> 13</span> <span id="14"> 14</span> <span id="15"> 15</span> <span id="16"> 16</span> <span id="17"> 17</span> <span id="18"> 18</span> <span id="19"> 19</span> <span id="20"> 20</span> <span id="21"> 21</span> <span id="22"> 22</span> <span id="23"> 23</span> <span id="24"> 24</span> <span id="25"> 25</span> <span id="26"> 26</span> <span id="27"> 27</span> <span id="28"> 28</span> <span id="29"> 29</span> <span id="30"> 30</span> <span id="31"> 31</span> <span id="32"> 32</span> <span id="33"> 33</span> <span id="34"> 34</span> <span id="35"> 35</span> <span id="36"> 36</span> <span id="37"> 37</span> <span id="38"> 38</span> <span id="39"> 39</span> <span id="40"> 40</span> <span id="41"> 41</span> <span id="42"> 42</span> <span id="43"> 43</span> <span id="44"> 44</span> <span id="45"> 45</span> <span id="46"> 46</span> <span id="47"> 47</span> <span id="48"> 48</span> <span id="49"> 49</span> <span id="50"> 50</span> <span id="51"> 51</span> <span id="52"> 52</span> <span id="53"> 53</span> <span id="54"> 54</span> <span id="55"> 55</span> <span id="56"> 56</span> <span id="57"> 57</span> <span id="58"> 58</span> <span id="59"> 59</span> <span id="60"> 60</span> <span id="61"> 61</span> <span id="62"> 62</span> <span id="63"> 63</span> <span id="64"> 64</span> <span id="65"> 65</span> <span id="66"> 66</span> <span id="67"> 67</span> <span id="68"> 68</span> <span id="69"> 69</span> <span id="70"> 70</span> <span id="71"> 71</span> <span id="72"> 72</span> <span id="73"> 73</span> <span id="74"> 74</span> <span id="75"> 75</span> <span id="76"> 76</span> <span id="77"> 77</span> <span id="78"> 78</span> <span id="79"> 79</span> <span id="80"> 80</span> <span id="81"> 81</span> <span id="82"> 82</span> <span id="83"> 83</span> <span id="84"> 84</span> <span id="85"> 85</span> <span id="86"> 86</span> <span id="87"> 87</span> <span id="88"> 88</span> <span id="89"> 89</span> <span id="90"> 90</span> <span id="91"> 91</span> <span id="92"> 92</span> <span id="93"> 93</span> <span id="94"> 94</span> <span id="95"> 95</span> <span id="96"> 96</span> <span id="97"> 97</span> <span id="98"> 98</span> <span id="99"> 99</span> <span id="100">100</span> <span id="101">101</span> <span id="102">102</span> <span id="103">103</span> <span id="104">104</span> <span id="105">105</span> <span id="106">106</span> <span id="107">107</span> <span id="108">108</span> <span id="109">109</span> <span id="110">110</span> <span id="111">111</span> <span id="112">112</span> <span id="113">113</span> <span id="114">114</span> <span id="115">115</span> <span id="116">116</span> <span id="117">117</span> <span id="118">118</span> <span id="119">119</span> <span id="120">120</span> <span id="121">121</span> <span id="122">122</span> <span id="123">123</span> <span id="124">124</span> <span id="125">125</span> <span id="126">126</span> <span id="127">127</span> <span id="128">128</span> <span id="129">129</span> <span id="130">130</span> <span id="131">131</span> <span id="132">132</span> <span id="133">133</span> <span id="134">134</span> <span id="135">135</span> <span id="136">136</span> <span id="137">137</span> <span id="138">138</span> <span id="139">139</span> <span id="140">140</span> <span id="141">141</span> <span id="142">142</span> <span id="143">143</span> <span id="144">144</span> <span id="145">145</span> <span id="146">146</span> <span id="147">147</span> <span id="148">148</span> <span id="149">149</span> <span id="150">150</span> <span id="151">151</span> <span id="152">152</span> <span id="153">153</span> <span id="154">154</span> <span id="155">155</span> <span id="156">156</span> <span id="157">157</span> <span id="158">158</span> <span id="159">159</span> <span id="160">160</span> <span id="161">161</span> <span id="162">162</span> <span id="163">163</span> <span id="164">164</span> <span id="165">165</span> <span id="166">166</span> <span id="167">167</span> <span id="168">168</span> <span id="169">169</span> <span id="170">170</span> <span id="171">171</span> <span id="172">172</span> <span id="173">173</span> <span id="174">174</span> <span id="175">175</span> <span id="176">176</span> <span id="177">177</span> <span id="178">178</span> <span id="179">179</span> <span id="180">180</span> <span id="181">181</span> <span id="182">182</span> <span id="183">183</span> <span id="184">184</span> <span id="185">185</span> <span id="186">186</span> <span id="187">187</span> </pre><pre class="rust "> <span class="comment">// Copyright 2014 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">cell</span>::<span class="ident">UnsafeCell</span>; <span class="kw">use</span> <span class="ident">libc</span>; <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">mutex</span>::{<span class="self">self</span>, <span class="ident">Mutex</span>}; <span class="kw">use</span> <span class="ident">time</span>::<span class="ident">Duration</span>; <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Condvar</span> { <span class="ident">inner</span>: <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">libc</span>::<span class="ident">pthread_cond_t</span><span class="op">></span> } <span class="kw">unsafe</span> <span class="kw">impl</span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Condvar</span> {} <span class="kw">unsafe</span> <span class="kw">impl</span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Condvar</span> {} <span class="kw">const</span> <span class="ident">TIMESPEC_MAX</span>: <span class="ident">libc</span>::<span class="ident">timespec</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">timespec</span> { <span class="ident">tv_sec</span>: <span class="op"><</span><span class="ident">libc</span>::<span class="ident">time_t</span><span class="op">></span>::<span class="ident">max_value</span>(), <span class="ident">tv_nsec</span>: <span class="number">1_000_000_000</span> <span class="op">-</span> <span class="number">1</span>, }; <span class="kw">fn</span> <span class="ident">saturating_cast_to_time_t</span>(<span class="ident">value</span>: <span class="ident">u64</span>) <span class="op">-></span> <span class="ident">libc</span>::<span class="ident">time_t</span> { <span class="kw">if</span> <span class="ident">value</span> <span class="op">></span> <span class="op"><</span><span class="ident">libc</span>::<span class="ident">time_t</span><span class="op">></span>::<span class="ident">max_value</span>() <span class="kw">as</span> <span class="ident">u64</span> { <span class="op"><</span><span class="ident">libc</span>::<span class="ident">time_t</span><span class="op">></span>::<span class="ident">max_value</span>() } <span class="kw">else</span> { <span class="ident">value</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">time_t</span> } } <span class="kw">impl</span> <span class="ident">Condvar</span> { <span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-></span> <span class="ident">Condvar</span> { <span class="comment">// Might be moved and address is changing it is better to avoid</span> <span class="comment">// initialization of potentially opaque OS data before it landed</span> <span class="ident">Condvar</span> { <span class="ident">inner</span>: <span class="ident">UnsafeCell</span>::<span class="ident">new</span>(<span class="ident">libc</span>::<span class="ident">PTHREAD_COND_INITIALIZER</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 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">"android"</span>))]</span> <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">init</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {} <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</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 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">"android"</span>)))]</span> <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">init</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="kw">use</span> <span class="ident">mem</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_condattr_t</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">uninitialized</span>(); <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_condattr_init</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0</span>); <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_condattr_setclock</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>, <span class="ident">libc</span>::<span class="ident">CLOCK_MONOTONIC</span>); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0</span>); <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_cond_init</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">get</span>(), <span class="kw-2">&</span><span class="ident">attr</span>); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0</span>); <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_condattr_destroy</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">attr</span>); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0</span>); } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">notify_one</span>(<span class="kw-2">&</span><span class="self">self</span>) { <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_cond_signal</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">get</span>()); <span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0</span>); } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">notify_all</span>(<span class="kw-2">&</span><span class="self">self</span>) { <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_cond_broadcast</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">get</span>()); <span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0</span>); } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">wait</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">mutex</span>: <span class="kw-2">&</span><span class="ident">Mutex</span>) { <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_cond_wait</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">get</span>(), <span class="ident">mutex</span>::<span class="ident">raw</span>(<span class="ident">mutex</span>)); <span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0</span>); } <span class="comment">// This implementation is used on systems that support pthread_condattr_setclock</span> <span class="comment">// where we configure condition variable to use monotonic clock (instead of</span> <span class="comment">// default system clock). This approach avoids all problems that result</span> <span class="comment">// from changes made to the system time.</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</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 class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>)))]</span> <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">wait_timeout</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">mutex</span>: <span class="kw-2">&</span><span class="ident">Mutex</span>, <span class="ident">dur</span>: <span class="ident">Duration</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">use</span> <span class="ident">mem</span>; <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">now</span>: <span class="ident">libc</span>::<span class="ident">timespec</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">zeroed</span>(); <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">clock_gettime</span>(<span class="ident">libc</span>::<span class="ident">CLOCK_MONOTONIC</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">now</span>); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0</span>); <span class="comment">// Nanosecond calculations can't overflow because both values are below 1e9.</span> <span class="kw">let</span> <span class="ident">nsec</span> <span class="op">=</span> <span class="ident">dur</span>.<span class="ident">subsec_nanos</span>() <span class="op">+</span> <span class="ident">now</span>.<span class="ident">tv_nsec</span> <span class="kw">as</span> <span class="ident">u32</span>; <span class="kw">let</span> <span class="ident">sec</span> <span class="op">=</span> <span class="ident">saturating_cast_to_time_t</span>(<span class="ident">dur</span>.<span class="ident">as_secs</span>()) .<span class="ident">checked_add</span>((<span class="ident">nsec</span> <span class="op">/</span> <span class="number">1_000_000_000</span>) <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">time_t</span>) .<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">checked_add</span>(<span class="ident">now</span>.<span class="ident">tv_sec</span>)); <span class="kw">let</span> <span class="ident">nsec</span> <span class="op">=</span> <span class="ident">nsec</span> <span class="op">%</span> <span class="number">1_000_000_000</span>; <span class="kw">let</span> <span class="ident">timeout</span> <span class="op">=</span> <span class="ident">sec</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> { <span class="ident">libc</span>::<span class="ident">timespec</span> { <span class="ident">tv_sec</span>: <span class="ident">s</span>, <span class="ident">tv_nsec</span>: <span class="ident">nsec</span> <span class="kw">as</span> _} }).<span class="ident">unwrap_or</span>(<span class="ident">TIMESPEC_MAX</span>); <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_cond_timedwait</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">get</span>(), <span class="ident">mutex</span>::<span class="ident">raw</span>(<span class="ident">mutex</span>), <span class="kw-2">&</span><span class="ident">timeout</span>); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">r</span> <span class="op">==</span> <span class="ident">libc</span>::<span class="ident">ETIMEDOUT</span> <span class="op">||</span> <span class="ident">r</span> <span class="op">==</span> <span class="number">0</span>); <span class="ident">r</span> <span class="op">==</span> <span class="number">0</span> } <span class="comment">// This implementation is modeled after libcxx's condition_variable</span> <span class="comment">// https://github.com/llvm-mirror/libcxx/blob/release_35/src/condition_variable.cpp#L46</span> <span class="comment">// https://github.com/llvm-mirror/libcxx/blob/release_35/include/__mutex_base#L367</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 class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>))]</span> <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">wait_timeout</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">mutex</span>: <span class="kw-2">&</span><span class="ident">Mutex</span>, <span class="kw-2">mut</span> <span class="ident">dur</span>: <span class="ident">Duration</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">use</span> <span class="ident">ptr</span>; <span class="kw">use</span> <span class="ident">time</span>::<span class="ident">Instant</span>; <span class="comment">// 1000 years</span> <span class="kw">let</span> <span class="ident">max_dur</span> <span class="op">=</span> <span class="ident">Duration</span>::<span class="ident">from_secs</span>(<span class="number">1000</span> <span class="op">*</span> <span class="number">365</span> <span class="op">*</span> <span class="number">86400</span>); <span class="kw">if</span> <span class="ident">dur</span> <span class="op">></span> <span class="ident">max_dur</span> { <span class="comment">// OSX implementation of `pthread_cond_timedwait` is buggy</span> <span class="comment">// with super long durations. When duration is greater than</span> <span class="comment">// 0x100_0000_0000_0000 seconds, `pthread_cond_timedwait`</span> <span class="comment">// in macOS Sierra return error 316.</span> <span class="comment">//</span> <span class="comment">// This program demonstrates the issue:</span> <span class="comment">// https://gist.github.com/stepancheg/198db4623a20aad2ad7cddb8fda4a63c</span> <span class="comment">//</span> <span class="comment">// To work around this issue, and possible bugs of other OSes, timeout</span> <span class="comment">// is clamped to 1000 years, which is allowable per the API of `wait_timeout`</span> <span class="comment">// because of spurious wakeups.</span> <span class="ident">dur</span> <span class="op">=</span> <span class="ident">max_dur</span>; } <span class="comment">// First, figure out what time it currently is, in both system and</span> <span class="comment">// stable time. pthread_cond_timedwait uses system time, but we want to</span> <span class="comment">// report timeout based on stable time.</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sys_now</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">timeval</span> { <span class="ident">tv_sec</span>: <span class="number">0</span>, <span class="ident">tv_usec</span>: <span class="number">0</span> }; <span class="kw">let</span> <span class="ident">stable_now</span> <span class="op">=</span> <span class="ident">Instant</span>::<span class="ident">now</span>(); <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">gettimeofday</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">sys_now</span>, <span class="ident">ptr</span>::<span class="ident">null_mut</span>()); <span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0</span>); <span class="kw">let</span> <span class="ident">nsec</span> <span class="op">=</span> <span class="ident">dur</span>.<span class="ident">subsec_nanos</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_long</span> <span class="op">+</span> (<span class="ident">sys_now</span>.<span class="ident">tv_usec</span> <span class="op">*</span> <span class="number">1000</span>) <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_long</span>; <span class="kw">let</span> <span class="ident">extra</span> <span class="op">=</span> (<span class="ident">nsec</span> <span class="op">/</span> <span class="number">1_000_000_000</span>) <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">time_t</span>; <span class="kw">let</span> <span class="ident">nsec</span> <span class="op">=</span> <span class="ident">nsec</span> <span class="op">%</span> <span class="number">1_000_000_000</span>; <span class="kw">let</span> <span class="ident">seconds</span> <span class="op">=</span> <span class="ident">saturating_cast_to_time_t</span>(<span class="ident">dur</span>.<span class="ident">as_secs</span>()); <span class="kw">let</span> <span class="ident">timeout</span> <span class="op">=</span> <span class="ident">sys_now</span>.<span class="ident">tv_sec</span>.<span class="ident">checked_add</span>(<span class="ident">extra</span>).<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> { <span class="ident">s</span>.<span class="ident">checked_add</span>(<span class="ident">seconds</span>) }).<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> { <span class="ident">libc</span>::<span class="ident">timespec</span> { <span class="ident">tv_sec</span>: <span class="ident">s</span>, <span class="ident">tv_nsec</span>: <span class="ident">nsec</span> } }).<span class="ident">unwrap_or</span>(<span class="ident">TIMESPEC_MAX</span>); <span class="comment">// And wait!</span> <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_cond_timedwait</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">get</span>(), <span class="ident">mutex</span>::<span class="ident">raw</span>(<span class="ident">mutex</span>), <span class="kw-2">&</span><span class="ident">timeout</span>); <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">r</span> <span class="op">==</span> <span class="ident">libc</span>::<span class="ident">ETIMEDOUT</span> <span class="op">||</span> <span class="ident">r</span> <span class="op">==</span> <span class="number">0</span>); <span class="comment">// ETIMEDOUT is not a totally reliable method of determining timeout due</span> <span class="comment">// to clock shifts, so do the check ourselves</span> <span class="ident">stable_now</span>.<span class="ident">elapsed</span>() <span class="op"><</span> <span class="ident">dur</span> } <span class="attribute">#[<span class="ident">inline</span>]</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">"dragonfly"</span>))]</span> <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">destroy</span>(<span class="kw-2">&</span><span class="self">self</span>) { <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_cond_destroy</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">get</span>()); <span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>, <span class="number">0</span>); } <span class="attribute">#[<span class="ident">inline</span>]</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"dragonfly"</span>)]</span> <span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">destroy</span>(<span class="kw-2">&</span><span class="self">self</span>) { <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">libc</span>::<span class="ident">pthread_cond_destroy</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">get</span>()); <span class="comment">// On DragonFly pthread_cond_destroy() returns EINVAL if called on</span> <span class="comment">// a condvar that was just initialized with</span> <span class="comment">// libc::PTHREAD_COND_INITIALIZER. Once it is used or</span> <span class="comment">// pthread_cond_init() is called, this behaviour no longer occurs.</span> <span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">r</span> <span class="op">==</span> <span class="number">0</span> <span class="op">||</span> <span class="ident">r</span> <span class="op">==</span> <span class="ident">libc</span>::<span class="ident">EINVAL</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>