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| </pre><div class="example-wrap"><pre class="rust "> |
| <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">mod</span> <span class="ident">eventfd</span> { |
| <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">sys</span>::<span class="ident">Selector</span>; |
| <span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">Interest</span>, <span class="ident">Token</span>}; |
| |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="self">self</span>, <span class="ident">Read</span>, <span class="ident">Write</span>}; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">os</span>::<span class="ident">unix</span>::<span class="ident">io</span>::<span class="ident">FromRawFd</span>; |
| |
| <span class="doccomment">/// Waker backed by `eventfd`.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// `eventfd` is effectively an 64 bit counter. All writes must be of 8</span> |
| <span class="doccomment">/// bytes (64 bits) and are converted (native endian) into an 64 bit</span> |
| <span class="doccomment">/// unsigned integer and added to the count. Reads must also be 8 bytes and</span> |
| <span class="doccomment">/// reset the count to 0, returning the count.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Waker</span> { |
| <span class="ident">fd</span>: <span class="ident">File</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Waker</span> { |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">selector</span>: <span class="kw-2">&</span><span class="ident">Selector</span>, <span class="ident">token</span>: <span class="ident">Token</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">Waker</span><span class="op">></span> { |
| <span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">eventfd</span>(<span class="number">0</span>, <span class="ident">libc</span>::<span class="ident">EFD_CLOEXEC</span> <span class="op">|</span> <span class="ident">libc</span>::<span class="ident">EFD_NONBLOCK</span>)).<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">fd</span><span class="op">|</span> { |
| <span class="comment">// Turn the file descriptor into a file first so we're ensured</span> |
| <span class="comment">// it's closed when dropped, e.g. when register below fails.</span> |
| <span class="kw">let</span> <span class="ident">file</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">File</span>::<span class="ident">from_raw_fd</span>(<span class="ident">fd</span>) }; |
| <span class="ident">selector</span> |
| .<span class="ident">register</span>(<span class="ident">fd</span>, <span class="ident">token</span>, <span class="ident">Interest</span>::<span class="ident">READABLE</span>) |
| .<span class="ident">map</span>(<span class="op">|</span>()<span class="op">|</span> <span class="ident">Waker</span> { <span class="ident">fd</span>: <span class="ident">file</span> }) |
| }) |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wake</span>(<span class="kw-2">&</span><span class="self">self</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="op">></span> { |
| <span class="kw">let</span> <span class="ident">buf</span>: [<span class="ident">u8</span>; <span class="number">8</span>] <span class="op">=</span> <span class="number">1u64</span>.<span class="ident">to_ne_bytes</span>(); |
| <span class="kw">match</span> (<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">fd</span>).<span class="ident">write</span>(<span class="kw-2">&</span><span class="ident">buf</span>) { |
| <span class="prelude-val">Ok</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(()), |
| <span class="prelude-val">Err</span>(<span class="kw-2">ref</span> <span class="ident">err</span>) <span class="kw">if</span> <span class="ident">err</span>.<span class="ident">kind</span>() <span class="op">=</span><span class="op">=</span> <span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">WouldBlock</span> <span class="op">=</span><span class="op">></span> { |
| <span class="comment">// Writing only blocks if the counter is going to overflow.</span> |
| <span class="comment">// So we'll reset the counter to 0 and wake it again.</span> |
| <span class="self">self</span>.<span class="ident">reset</span>()<span class="question-mark">?</span>; |
| <span class="self">self</span>.<span class="ident">wake</span>() |
| } |
| <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">err</span>), |
| } |
| } |
| |
| <span class="doccomment">/// Reset the eventfd object, only need to call this if `wake` fails.</span> |
| <span class="kw">fn</span> <span class="ident">reset</span>(<span class="kw-2">&</span><span class="self">self</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="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span>: [<span class="ident">u8</span>; <span class="number">8</span>] <span class="op">=</span> <span class="number">0u64</span>.<span class="ident">to_ne_bytes</span>(); |
| <span class="kw">match</span> (<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">fd</span>).<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>) { |
| <span class="prelude-val">Ok</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(()), |
| <span class="comment">// If the `Waker` hasn't been awoken yet this will return a</span> |
| <span class="comment">// `WouldBlock` error which we can safely ignore.</span> |
| <span class="prelude-val">Err</span>(<span class="kw-2">ref</span> <span class="ident">err</span>) <span class="kw">if</span> <span class="ident">err</span>.<span class="ident">kind</span>() <span class="op">=</span><span class="op">=</span> <span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">WouldBlock</span> <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(()), |
| <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">err</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">use</span> <span class="self">self</span>::<span class="ident">eventfd</span>::<span class="ident">Waker</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">"ios"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>))]</span> |
| <span class="kw">mod</span> <span class="ident">kqueue</span> { |
| <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">sys</span>::<span class="ident">Selector</span>; |
| <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">Token</span>; |
| |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>; |
| |
| <span class="doccomment">/// Waker backed by kqueue user space notifications (`EVFILT_USER`).</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The implementation is fairly simple, first the kqueue must be setup to</span> |
| <span class="doccomment">/// receive waker events this done by calling `Selector.setup_waker`. Next</span> |
| <span class="doccomment">/// we need access to kqueue, thus we need to duplicate the file descriptor.</span> |
| <span class="doccomment">/// Now waking is as simple as adding an event to the kqueue.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Waker</span> { |
| <span class="ident">selector</span>: <span class="ident">Selector</span>, |
| <span class="ident">token</span>: <span class="ident">Token</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Waker</span> { |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">selector</span>: <span class="kw-2">&</span><span class="ident">Selector</span>, <span class="ident">token</span>: <span class="ident">Token</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">Waker</span><span class="op">></span> { |
| <span class="ident">selector</span>.<span class="ident">try_clone</span>().<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">selector</span><span class="op">|</span> { |
| <span class="ident">selector</span> |
| .<span class="ident">setup_waker</span>(<span class="ident">token</span>) |
| .<span class="ident">map</span>(<span class="op">|</span>()<span class="op">|</span> <span class="ident">Waker</span> { <span class="ident">selector</span>, <span class="ident">token</span> }) |
| }) |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wake</span>(<span class="kw-2">&</span><span class="self">self</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="op">></span> { |
| <span class="self">self</span>.<span class="ident">selector</span>.<span class="ident">wake</span>(<span class="self">self</span>.<span class="ident">token</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">"ios"</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>))]</span> |
| <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">kqueue</span>::<span class="ident">Waker</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">"dragonfly"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"illumos"</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">"openbsd"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"solaris"</span> |
| ))]</span> |
| <span class="kw">mod</span> <span class="ident">pipe</span> { |
| <span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">sys</span>::<span class="ident">unix</span>::<span class="ident">Selector</span>; |
| <span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">Interest</span>, <span class="ident">Token</span>}; |
| |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fs</span>::<span class="ident">File</span>; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="self">self</span>, <span class="ident">Read</span>, <span class="ident">Write</span>}; |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">os</span>::<span class="ident">unix</span>::<span class="ident">io</span>::<span class="ident">FromRawFd</span>; |
| |
| <span class="doccomment">/// Waker backed by a unix pipe.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Waker controls both the sending and receiving ends and empties the pipe</span> |
| <span class="doccomment">/// if writing to it (waking) fails.</span> |
| <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Waker</span> { |
| <span class="ident">sender</span>: <span class="ident">File</span>, |
| <span class="ident">receiver</span>: <span class="ident">File</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">Waker</span> { |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">selector</span>: <span class="kw-2">&</span><span class="ident">Selector</span>, <span class="ident">token</span>: <span class="ident">Token</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">Waker</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">fds</span> <span class="op">=</span> [<span class="op">-</span><span class="number">1</span>; <span class="number">2</span>]; |
| <span class="macro">syscall</span><span class="macro">!</span>(<span class="ident">pipe2</span>(<span class="ident">fds</span>.<span class="ident">as_mut_ptr</span>(), <span class="ident">libc</span>::<span class="ident">O_NONBLOCK</span> <span class="op">|</span> <span class="ident">libc</span>::<span class="ident">O_CLOEXEC</span>))<span class="question-mark">?</span>; |
| <span class="comment">// Turn the file descriptors into files first so we're ensured</span> |
| <span class="comment">// they're closed when dropped, e.g. when register below fails.</span> |
| <span class="kw">let</span> <span class="ident">sender</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">File</span>::<span class="ident">from_raw_fd</span>(<span class="ident">fds</span>[<span class="number">1</span>]) }; |
| <span class="kw">let</span> <span class="ident">receiver</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">File</span>::<span class="ident">from_raw_fd</span>(<span class="ident">fds</span>[<span class="number">0</span>]) }; |
| <span class="ident">selector</span> |
| .<span class="ident">register</span>(<span class="ident">fds</span>[<span class="number">0</span>], <span class="ident">token</span>, <span class="ident">Interest</span>::<span class="ident">READABLE</span>) |
| .<span class="ident">map</span>(<span class="op">|</span>()<span class="op">|</span> <span class="ident">Waker</span> { <span class="ident">sender</span>, <span class="ident">receiver</span> }) |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wake</span>(<span class="kw-2">&</span><span class="self">self</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="op">></span> { |
| <span class="comment">// The epoll emulation on some illumos systems currently requires</span> |
| <span class="comment">// the pipe buffer to be completely empty for an edge-triggered</span> |
| <span class="comment">// wakeup on the pipe read side.</span> |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"illumos"</span>)]</span> |
| <span class="self">self</span>.<span class="ident">empty</span>(); |
| |
| <span class="kw">match</span> (<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">sender</span>).<span class="ident">write</span>(<span class="kw-2">&</span>[<span class="number">1</span>]) { |
| <span class="prelude-val">Ok</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Ok</span>(()), |
| <span class="prelude-val">Err</span>(<span class="kw-2">ref</span> <span class="ident">err</span>) <span class="kw">if</span> <span class="ident">err</span>.<span class="ident">kind</span>() <span class="op">=</span><span class="op">=</span> <span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">WouldBlock</span> <span class="op">=</span><span class="op">></span> { |
| <span class="comment">// The reading end is full so we'll empty the buffer and try</span> |
| <span class="comment">// again.</span> |
| <span class="self">self</span>.<span class="ident">empty</span>(); |
| <span class="self">self</span>.<span class="ident">wake</span>() |
| } |
| <span class="prelude-val">Err</span>(<span class="kw-2">ref</span> <span class="ident">err</span>) <span class="kw">if</span> <span class="ident">err</span>.<span class="ident">kind</span>() <span class="op">=</span><span class="op">=</span> <span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Interrupted</span> <span class="op">=</span><span class="op">></span> <span class="self">self</span>.<span class="ident">wake</span>(), |
| <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">Err</span>(<span class="ident">err</span>), |
| } |
| } |
| |
| <span class="doccomment">/// Empty the pipe's buffer, only need to call this if `wake` fails.</span> |
| <span class="doccomment">/// This ignores any errors.</span> |
| <span class="kw">fn</span> <span class="ident">empty</span>(<span class="kw-2">&</span><span class="self">self</span>) { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0</span>; <span class="number">4096</span>]; |
| <span class="kw">loop</span> { |
| <span class="kw">match</span> (<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">receiver</span>).<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>) { |
| <span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="kw">if</span> <span class="ident">n</span> <span class="op">></span> <span class="number">0</span> <span class="op">=</span><span class="op">></span> <span class="kw">continue</span>, |
| <span class="kw">_</span> <span class="op">=</span><span class="op">></span> <span class="kw">return</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">"dragonfly"</span>, |
| <span class="ident">target_os</span> <span class="op">=</span> <span class="string">"illumos"</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">"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">use</span> <span class="self">self</span>::<span class="ident">pipe</span>::<span class="ident">Waker</span>; |
| </pre></div> |
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