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</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="doccomment">//! Platform-independent platform abstraction</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This is the platform-independent portion of the standard library's</span>
<span class="doccomment">//! platform abstraction layer, whereas `std::sys` is the</span>
<span class="doccomment">//! platform-specific portion.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The relationship between `std::sys_common`, `std::sys` and the</span>
<span class="doccomment">//! rest of `std` is complex, with dependencies going in all</span>
<span class="doccomment">//! directions: `std` depending on `sys_common`, `sys_common`</span>
<span class="doccomment">//! depending on `sys`, and `sys` depending on `sys_common` and `std`.</span>
<span class="doccomment">//! Ideally `sys_common` would be split into two and the dependencies</span>
<span class="doccomment">//! between them all would form a dag, facilitating the extraction of</span>
<span class="doccomment">//! `std::sys` from the standard library.</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">missing_docs</span>)]</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">missing_debug_implementations</span>)]</span>
<span class="kw">use</span> <span class="ident">sync</span>::<span class="ident">Once</span>;
<span class="kw">use</span> <span class="ident">sys</span>;
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">rtabort</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=></span> (::<span class="ident">sys_common</span>::<span class="ident">util</span>::<span class="ident">abort</span>(<span class="macro">format_args</span><span class="macro">!</span>($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)<span class="kw-2">*</span>)))
}
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">rtassert</span> {
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">expr</span>) <span class="op">=></span> (<span class="kw">if</span> <span class="op">!</span><span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span> {
<span class="macro">rtabort</span><span class="macro">!</span>(<span class="macro">concat</span><span class="macro">!</span>(<span class="string">"assertion failed: "</span>, <span class="macro">stringify</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>)));
})
}
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">at_exit_imp</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"backtrace"</span>)]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">backtrace</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">condvar</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">io</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">mutex</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">poison</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">remutex</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">rwlock</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">thread</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">thread_info</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">thread_local</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">util</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">wtf8</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">bytestring</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">process</span>;
<span class="macro">cfg_if</span><span class="macro">!</span> {
<span class="kw">if</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">"cloudabi"</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">"redox"</span>))]</span> {
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">net</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"wasm32"</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">pub</span> <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">net</span>;
} <span class="kw">else</span> {
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">net</span>;
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"backtrace"</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">all</span>(<span class="ident">unix</span>, <span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>)),
<span class="ident">all</span>(<span class="ident">windows</span>, <span class="ident">target_env</span> <span class="op">=</span> <span class="string">"gnu"</span>),
<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"redox"</span>))]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">gnu</span>;
<span class="comment">// common error constructors</span>
<span class="doccomment">/// A trait for viewing representations from std types</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">AsInner</span><span class="op"><</span><span class="ident">Inner</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">as_inner</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Inner</span>;
}
<span class="doccomment">/// A trait for viewing representations from std types</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">AsInnerMut</span><span class="op"><</span><span class="ident">Inner</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">as_inner_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Inner</span>;
}
<span class="doccomment">/// A trait for extracting representations from std types</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">IntoInner</span><span class="op"><</span><span class="ident">Inner</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Inner</span>;
}
<span class="doccomment">/// A trait for creating std types from internal representations</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">FromInner</span><span class="op"><</span><span class="ident">Inner</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from_inner</span>(<span class="ident">inner</span>: <span class="ident">Inner</span>) <span class="op">-></span> <span class="self">Self</span>;
}
<span class="doccomment">/// Enqueues a procedure to run when the main thread exits.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Currently these closures are only run once the main *Rust* thread exits.</span>
<span class="doccomment">/// Once the `at_exit` handlers begin running, more may be enqueued, but not</span>
<span class="doccomment">/// infinitely so. Eventually a handler registration will be forced to fail.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns `Ok` if the handler was successfully registered, meaning that the</span>
<span class="doccomment">/// closure will be run once the main thread exits. Returns `Err` to indicate</span>
<span class="doccomment">/// that the closure could not be registered, meaning that it is not scheduled</span>
<span class="doccomment">/// to be run.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">at_exit</span><span class="op"><</span><span class="ident">F</span>: <span class="ident">FnOnce</span>() <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">'static</span><span class="op">></span>(<span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), ()<span class="op">></span> {
<span class="kw">if</span> <span class="ident">at_exit_imp</span>::<span class="ident">push</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">f</span>)) {<span class="prelude-val">Ok</span>(())} <span class="kw">else</span> {<span class="prelude-val">Err</span>(())}
}
<span class="doccomment">/// One-time runtime cleanup.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cleanup</span>() {
<span class="kw">static</span> <span class="ident">CLEANUP</span>: <span class="ident">Once</span> <span class="op">=</span> <span class="ident">Once</span>::<span class="ident">new</span>();
<span class="ident">CLEANUP</span>.<span class="ident">call_once</span>(<span class="op">||</span> <span class="kw">unsafe</span> {
<span class="ident">sys</span>::<span class="ident">args</span>::<span class="ident">cleanup</span>();
<span class="ident">sys</span>::<span class="ident">stack_overflow</span>::<span class="ident">cleanup</span>();
<span class="ident">at_exit_imp</span>::<span class="ident">cleanup</span>();
});
}
<span class="comment">// Computes (value*numer)/denom without overflow, as long as both</span>
<span class="comment">// (numer*denom) and the overall result fit into i64 (which is the case</span>
<span class="comment">// for our time conversions).</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span> <span class="comment">// not used on all platforms</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">mul_div_u64</span>(<span class="ident">value</span>: <span class="ident">u64</span>, <span class="ident">numer</span>: <span class="ident">u64</span>, <span class="ident">denom</span>: <span class="ident">u64</span>) <span class="op">-></span> <span class="ident">u64</span> {
<span class="kw">let</span> <span class="ident">q</span> <span class="op">=</span> <span class="ident">value</span> <span class="op">/</span> <span class="ident">denom</span>;
<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">value</span> <span class="op">%</span> <span class="ident">denom</span>;
<span class="comment">// Decompose value as (value/denom*denom + value%denom),</span>
<span class="comment">// substitute into (value*numer)/denom and simplify.</span>
<span class="comment">// r < denom, so (denom*numer) is the upper bound of (r*numer)</span>
<span class="ident">q</span> <span class="op">*</span> <span class="ident">numer</span> <span class="op">+</span> <span class="ident">r</span> <span class="op">*</span> <span class="ident">numer</span> <span class="op">/</span> <span class="ident">denom</span>
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_muldiv</span>() {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">mul_div_u64</span>( <span class="number">1_000_000_000_001</span>, <span class="number">1_000_000_000</span>, <span class="number">1_000_000</span>),
<span class="number">1_000_000_000_001_000</span>);
}
</pre>
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