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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 <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">sys</span>::<span class="ident">mutex</span> <span class="kw">as</span> <span class="ident">imp</span>;
<span class="doccomment">/// An OS-based mutual exclusion lock.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is the thinnest cross-platform wrapper around OS mutexes. All usage of</span>
<span class="doccomment">/// this mutex is unsafe and it is recommended to instead use the safe wrapper</span>
<span class="doccomment">/// at the top level of the crate instead of this type.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Mutex</span>(<span class="ident">imp</span>::<span class="ident">Mutex</span>);
<span class="kw">unsafe</span> <span class="kw">impl</span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Mutex</span> {}
<span class="kw">impl</span> <span class="ident">Mutex</span> {
<span class="doccomment">/// Creates a new mutex for use.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Behavior is undefined if the mutex is moved after it is</span>
<span class="doccomment">/// first used with any of the functions below.</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">Mutex</span> { <span class="ident">Mutex</span>(<span class="ident">imp</span>::<span class="ident">Mutex</span>::<span class="ident">new</span>()) }
<span class="doccomment">/// Prepare the mutex for use.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This should be called once the mutex is at a stable memory address.</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">init</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">init</span>() }
<span class="doccomment">/// Locks the mutex blocking the current thread until it is available.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Behavior is undefined if the mutex has been moved between this and any</span>
<span class="doccomment">/// previous function call.</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">raw_lock</span>(<span class="kw-2">&</span><span class="self">self</span>) { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">lock</span>() }
<span class="doccomment">/// Calls raw_lock() and then returns an RAII guard to guarantee the mutex</span>
<span class="doccomment">/// will be unlocked.</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">lock</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">MutexGuard</span> {
<span class="self">self</span>.<span class="ident">raw_lock</span>();
<span class="ident">MutexGuard</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>)
}
<span class="doccomment">/// Attempts to lock the mutex without blocking, returning whether it was</span>
<span class="doccomment">/// successfully acquired or not.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Behavior is undefined if the mutex has been moved between this and any</span>
<span class="doccomment">/// previous function call.</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">try_lock</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">try_lock</span>() }
<span class="doccomment">/// Unlocks the mutex.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Behavior is undefined if the current thread does not actually hold the</span>
<span class="doccomment">/// mutex.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Consider switching from the pair of raw_lock() and raw_unlock() to</span>
<span class="doccomment">/// lock() whenever possible.</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">raw_unlock</span>(<span class="kw-2">&</span><span class="self">self</span>) { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">unlock</span>() }
<span class="doccomment">/// Deallocates all resources associated with this mutex.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Behavior is undefined if there are current or will be future users of</span>
<span class="doccomment">/// this mutex.</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">destroy</span>(<span class="kw-2">&</span><span class="self">self</span>) { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">destroy</span>() }
}
<span class="comment">// not meant to be exported to the outside world, just the containing module</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">raw</span>(<span class="ident">mutex</span>: <span class="kw-2">&</span><span class="ident">Mutex</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">imp</span>::<span class="ident">Mutex</span> { <span class="kw-2">&</span><span class="ident">mutex</span>.<span class="number">0</span> }
<span class="attribute">#[<span class="ident">must_use</span>]</span>
<span class="doccomment">/// A simple RAII utility for the above Mutex without the poisoning semantics.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">MutexGuard</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">imp</span>::<span class="ident">Mutex</span>);
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">MutexGuard</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</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">unsafe</span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">unlock</span>(); }
}
}
</pre>
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