diff --git a/ch3/os/task/struct.TASK_MANAGER.html b/ch3/os/task/struct.TASK_MANAGER.html
index 8920c66b..776017e0 100644
--- a/ch3/os/task/struct.TASK_MANAGER.html
+++ b/ch3/os/task/struct.TASK_MANAGER.html
@@ -10,7 +10,7 @@ But in ch3, we load apps statically, so the first task is a real app.</p>
 <p>In this case, we only return the first <code>Ready</code> task in task list.</p>
 </div></details><details class="toggle method-toggle" open><summary><section id="method.run_next_task" class="method"><a class="src rightside" href="../../src/os/task/mod.rs.html#122-140">source</a><h4 class="code-header">fn <a href="#method.run_next_task" class="fn">run_next_task</a>(&amp;self)</h4></section></summary><div class="docblock"><p>Switch current <code>Running</code> task to the task we have found,
 or there is no <code>Ready</code> task and we can exit with all applications completed</p>
-</div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-__Deref-for-TASK_MANAGER" class="impl"><a class="src rightside" href="../../src/os/task/mod.rs.html#52-74">source</a><a href="#impl-__Deref-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Target" class="associatedtype trait-impl"><a href="#associatedtype.Target" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#associatedtype.Target" class="associatedtype">Target</a> = <a class="struct" href="struct.TaskManager.html" title="struct os::task::TaskManager">TaskManager</a></h4></section></summary><div class='docblock'>The resulting type after dereferencing.</div></details><details class="toggle method-toggle" open><summary><section id="method.deref" class="method trait-impl"><a class="src rightside" href="../../src/os/task/mod.rs.html#52-74">source</a><a href="#method.deref" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#tymethod.deref" class="fn">deref</a>(&amp;self) -&gt; &amp;<a class="struct" href="struct.TaskManager.html" title="struct os::task::TaskManager">TaskManager</a></h4></section></summary><div class='docblock'>Dereferences the value.</div></details></div></details><section id="impl-LazyStatic-for-TASK_MANAGER" class="impl"><a class="src rightside" href="../../src/os/task/mod.rs.html#52-74">source</a><a href="#impl-LazyStatic-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://docs.rs/lazy_static/1.4.0/lazy_static/trait.LazyStatic.html" title="trait lazy_static::LazyStatic">LazyStatic</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-TASK_MANAGER" class="impl"><a href="#impl-Freeze-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section><section id="impl-RefUnwindSafe-for-TASK_MANAGER" class="impl"><a href="#impl-RefUnwindSafe-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section><section id="impl-Send-for-TASK_MANAGER" class="impl"><a href="#impl-Send-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section><section id="impl-Sync-for-TASK_MANAGER" class="impl"><a href="#impl-Sync-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section><section id="impl-Unpin-for-TASK_MANAGER" class="impl"><a href="#impl-Unpin-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section><section id="impl-UnwindSafe-for-TASK_MANAGER" class="impl"><a href="#impl-UnwindSafe-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#140">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
+</div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-__Deref-for-TASK_MANAGER" class="impl"><a class="src rightside" href="../../src/os/task/mod.rs.html#52-74">source</a><a href="#impl-__Deref-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Target" class="associatedtype trait-impl"><a href="#associatedtype.Target" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#associatedtype.Target" class="associatedtype">Target</a> = <a class="struct" href="struct.TaskManager.html" title="struct os::task::TaskManager">TaskManager</a></h4></section></summary><div class='docblock'>The resulting type after dereferencing.</div></details><details class="toggle method-toggle" open><summary><section id="method.deref" class="method trait-impl"><a class="src rightside" href="../../src/os/task/mod.rs.html#52-74">source</a><a href="#method.deref" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#tymethod.deref" class="fn">deref</a>(&amp;self) -&gt; &amp;<a class="struct" href="struct.TaskManager.html" title="struct os::task::TaskManager">TaskManager</a></h4></section></summary><div class='docblock'>Dereferences the value.</div></details></div></details><section id="impl-LazyStatic-for-TASK_MANAGER" class="impl"><a class="src rightside" href="../../src/os/task/mod.rs.html#52-74">source</a><a href="#impl-LazyStatic-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://docs.rs/lazy_static/1.5.0/lazy_static/trait.LazyStatic.html" title="trait lazy_static::LazyStatic">LazyStatic</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-TASK_MANAGER" class="impl"><a href="#impl-Freeze-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section><section id="impl-RefUnwindSafe-for-TASK_MANAGER" class="impl"><a href="#impl-RefUnwindSafe-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section><section id="impl-Send-for-TASK_MANAGER" class="impl"><a href="#impl-Send-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section><section id="impl-Sync-for-TASK_MANAGER" class="impl"><a href="#impl-Sync-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section><section id="impl-Unpin-for-TASK_MANAGER" class="impl"><a href="#impl-Unpin-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section><section id="impl-UnwindSafe-for-TASK_MANAGER" class="impl"><a href="#impl-UnwindSafe-for-TASK_MANAGER" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.TASK_MANAGER.html" title="struct os::task::TASK_MANAGER">TASK_MANAGER</a></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#140">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
     T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#141">source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#208">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T<div class="where">where
     T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#210">source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/core/primitive.reference.html">&amp;T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#216">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T<div class="where">where
     T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#217">source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/core/primitive.reference.html">&amp;mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#765">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#768">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -&gt; T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
diff --git a/ch3/trait.impl/lazy_static/trait.LazyStatic.js b/ch3/trait.impl/lazy_static/trait.LazyStatic.js
index abeb8610..f8d864a5 100644
--- a/ch3/trait.impl/lazy_static/trait.LazyStatic.js
+++ b/ch3/trait.impl/lazy_static/trait.LazyStatic.js
@@ -1,3 +1,3 @@
 (function() {var implementors = {
-"os":[["impl <a class=\"trait\" href=\"https://docs.rs/lazy_static/1.4.0/lazy_static/trait.LazyStatic.html\" title=\"trait lazy_static::LazyStatic\">LazyStatic</a> for <a class=\"struct\" href=\"os/task/struct.TASK_MANAGER.html\" title=\"struct os::task::TASK_MANAGER\">TASK_MANAGER</a>"]]
+"os":[["impl <a class=\"trait\" href=\"https://docs.rs/lazy_static/1.5.0/lazy_static/trait.LazyStatic.html\" title=\"trait lazy_static::LazyStatic\">LazyStatic</a> for <a class=\"struct\" href=\"os/task/struct.TASK_MANAGER.html\" title=\"struct os::task::TASK_MANAGER\">TASK_MANAGER</a>"]]
 };if (window.register_implementors) {window.register_implementors(implementors);} else {window.pending_implementors = implementors;}})()
\ No newline at end of file