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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="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">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">"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">"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="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_long</span> <span class="op">+</span> <span class="ident">now</span>.<span class="ident">tv_nsec</span> <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">c_long</span>;
<span class="comment">// FIXME: Casting u64 into time_t could truncate the value.</span>
<span class="kw">let</span> <span class="ident">sec</span> <span class="op">=</span> (<span class="ident">dur</span>.<span class="ident">as_secs</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">time_t</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="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="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">// 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">dur</span>.<span class="ident">as_secs</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">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>
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