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<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 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, 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">//! Generic support for building blocking abstractions.</span>

<span class="kw">use</span> <span class="ident">thread</span>::{<span class="self">self</span>, <span class="ident">Thread</span>};
<span class="kw">use</span> <span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicBool</span>, <span class="ident">Ordering</span>};
<span class="kw">use</span> <span class="ident">sync</span>::<span class="ident">Arc</span>;
<span class="kw">use</span> <span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">time</span>::<span class="ident">Instant</span>;

<span class="kw">struct</span> <span class="ident">Inner</span> {
    <span class="ident">thread</span>: <span class="ident">Thread</span>,
    <span class="ident">woken</span>: <span class="ident">AtomicBool</span>,
}

<span class="kw">unsafe</span> <span class="kw">impl</span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Inner</span> {}
<span class="kw">unsafe</span> <span class="kw">impl</span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Inner</span> {}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SignalToken</span> {
    <span class="ident">inner</span>: <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">Inner</span><span class="op">&gt;</span>,
}

<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">WaitToken</span> {
    <span class="ident">inner</span>: <span class="ident">Arc</span><span class="op">&lt;</span><span class="ident">Inner</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span> <span class="op">!</span><span class="ident">Send</span> <span class="kw">for</span> <span class="ident">WaitToken</span> {}

<span class="kw">impl</span> <span class="op">!</span><span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">WaitToken</span> {}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">tokens</span>() <span class="op">-&gt;</span> (<span class="ident">WaitToken</span>, <span class="ident">SignalToken</span>) {
    <span class="kw">let</span> <span class="ident">inner</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Inner</span> {
        <span class="ident">thread</span>: <span class="ident">thread</span>::<span class="ident">current</span>(),
        <span class="ident">woken</span>: <span class="ident">AtomicBool</span>::<span class="ident">new</span>(<span class="bool-val">false</span>),
    });
    <span class="kw">let</span> <span class="ident">wait_token</span> <span class="op">=</span> <span class="ident">WaitToken</span> {
        <span class="ident">inner</span>: <span class="ident">inner</span>.<span class="ident">clone</span>(),
    };
    <span class="kw">let</span> <span class="ident">signal_token</span> <span class="op">=</span> <span class="ident">SignalToken</span> {
        <span class="ident">inner</span>,
    };
    (<span class="ident">wait_token</span>, <span class="ident">signal_token</span>)
}

<span class="kw">impl</span> <span class="ident">SignalToken</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">signal</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">let</span> <span class="ident">wake</span> <span class="op">=</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">woken</span>.<span class="ident">compare_and_swap</span>(<span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
        <span class="kw">if</span> <span class="ident">wake</span> {
            <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">thread</span>.<span class="ident">unpark</span>();
        }
        <span class="ident">wake</span>
    }

    <span class="doccomment">/// Convert to an unsafe usize value. Useful for storing in a pipe&#39;s state</span>
    <span class="doccomment">/// flag.</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">cast_to_usize</span>(<span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="self">self</span>.<span class="ident">inner</span>)
    }

    <span class="doccomment">/// Convert from an unsafe usize value. Useful for retrieving a pipe&#39;s state</span>
    <span class="doccomment">/// flag.</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">cast_from_usize</span>(<span class="ident">signal_ptr</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">SignalToken</span> {
        <span class="ident">SignalToken</span> { <span class="ident">inner</span>: <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">signal_ptr</span>) }
    }
}

<span class="kw">impl</span> <span class="ident">WaitToken</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wait</span>(<span class="self">self</span>) {
        <span class="kw">while</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">woken</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>) {
            <span class="ident">thread</span>::<span class="ident">park</span>()
        }
    }

    <span class="doccomment">/// Returns true if we wake up normally, false otherwise.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wait_max_until</span>(<span class="self">self</span>, <span class="ident">end</span>: <span class="ident">Instant</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        <span class="kw">while</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">woken</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>) {
            <span class="kw">let</span> <span class="ident">now</span> <span class="op">=</span> <span class="ident">Instant</span>::<span class="ident">now</span>();
            <span class="kw">if</span> <span class="ident">now</span> <span class="op">&gt;=</span> <span class="ident">end</span> {
                <span class="kw">return</span> <span class="bool-val">false</span>;
            }
            <span class="ident">thread</span>::<span class="ident">park_timeout</span>(<span class="ident">end</span> <span class="op">-</span> <span class="ident">now</span>)
        }
        <span class="bool-val">true</span>
    }
}
</pre>
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