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CyclicBarrier.html
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CyclicBarrier.html
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<!DOCTYPE html>
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Class: Concurrent::CyclicBarrier
— Concurrent Ruby
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<div id="content"><h1>Class: Concurrent::CyclicBarrier
</h1>
<div class="box_info">
<dl>
<dt>Inherits:</dt>
<dd>
<span class="inheritName"><span class='object_link'>Synchronization::LockableObject</span></span>
<ul class="fullTree">
<li>Object</li>
<li class="next"><span class='object_link'>Synchronization::LockableObject</span></li>
<li class="next">Concurrent::CyclicBarrier</li>
</ul>
<a href="#" class="inheritanceTree">show all</a>
</dd>
</dl>
<dl>
<dt>Defined in:</dt>
<dd>lib/concurrent/atomic/cyclic_barrier.rb</dd>
</dl>
</div>
<h2>Overview</h2><div class="docstring">
<div class="discussion">
<p>A synchronization aid that allows a set of threads to all wait for each
other to reach a common barrier point.</p>
</div>
</div>
<div class="tags">
<div class="examples">
<p class="tag_title">Examples:</p>
<pre class="example code"><code><span class='id identifier rubyid_barrier'>barrier</span> <span class='op'>=</span> <span class='const'><span class='object_link'><a href="../Concurrent.html" title="Concurrent (module)">Concurrent</a></span></span><span class='op'>::</span><span class='const'>CyclicBarrier</span><span class='period'>.</span><span class='id identifier rubyid_new'><span class='object_link'><a href="#initialize-instance_method" title="Concurrent::CyclicBarrier#initialize (method)">new</a></span></span><span class='lparen'>(</span><span class='int'>3</span><span class='rparen'>)</span>
<span class='id identifier rubyid_jobs'>jobs</span> <span class='op'>=</span> <span class='const'><span class='object_link'><a href="Array.html" title="Concurrent::Array (class)">Array</a></span></span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span><span class='lparen'>(</span><span class='int'>3</span><span class='rparen'>)</span> <span class='lbrace'>{</span> <span class='op'>|</span><span class='id identifier rubyid_i'>i</span><span class='op'>|</span> <span class='tlambda'>-></span> <span class='tlambeg'>{</span> <span class='id identifier rubyid_sleep'>sleep</span> <span class='id identifier rubyid_i'>i</span><span class='semicolon'>;</span> <span class='id identifier rubyid_p'>p</span> <span class='label'>done:</span> <span class='id identifier rubyid_i'>i</span> <span class='rbrace'>}</span> <span class='rbrace'>}</span>
<span class='id identifier rubyid_process'>process</span> <span class='op'>=</span> <span class='tlambda'>-></span> <span class='lparen'>(</span><span class='id identifier rubyid_i'>i</span><span class='rparen'>)</span> <span class='kw'>do</span>
<span class='comment'># waiting to start at the same time
</span> <span class='id identifier rubyid_barrier'>barrier</span><span class='period'>.</span><span class='id identifier rubyid_wait'>wait</span>
<span class='comment'># execute job
</span> <span class='id identifier rubyid_jobs'>jobs</span><span class='lbracket'>[</span><span class='id identifier rubyid_i'>i</span><span class='rbracket'>]</span><span class='period'>.</span><span class='id identifier rubyid_call'>call</span>
<span class='comment'># wait for others to finish
</span> <span class='id identifier rubyid_barrier'>barrier</span><span class='period'>.</span><span class='id identifier rubyid_wait'>wait</span>
<span class='kw'>end</span>
<span class='id identifier rubyid_threads'>threads</span> <span class='op'>=</span> <span class='int'>2</span><span class='period'>.</span><span class='id identifier rubyid_times'>times</span><span class='period'>.</span><span class='id identifier rubyid_map'>map</span> <span class='kw'>do</span> <span class='op'>|</span><span class='id identifier rubyid_i'>i</span><span class='op'>|</span>
<span class='const'>Thread</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span><span class='lparen'>(</span><span class='id identifier rubyid_i'>i</span><span class='comma'>,</span> <span class='op'>&</span><span class='id identifier rubyid_process'>process</span><span class='rparen'>)</span>
<span class='kw'>end</span>
<span class='comment'># use main as well
</span><span class='id identifier rubyid_process'>process</span><span class='period'>.</span><span class='id identifier rubyid_call'>call</span> <span class='int'>2</span>
<span class='comment'># here we can be sure that all jobs are processed</span></code></pre>
</div>
</div>
<h2>
Instance Method Summary
<small><a href="#" class="summary_toggle">collapse</a></small>
</h2>
<ul class="summary">
<li class="public ">
<span class="summary_signature">
<a href="#broken%3F-instance_method" title="#broken? (instance method)">#<strong>broken?</strong> ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'><p>A barrier can be broken when: - a thread called the <code>reset</code> method while at least one other thread was waiting - at least one thread timed out on <code>wait</code> method.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#initialize-instance_method" title="#initialize (instance method)">#<strong>initialize</strong>(parties) { ... } ⇒ CyclicBarrier </a>
</span>
<span class="note title constructor">constructor</span>
<span class="summary_desc"><div class='inline'><p>Create a new <code>CyclicBarrier</code> that waits for <code>parties</code> threads.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#number_waiting-instance_method" title="#number_waiting (instance method)">#<strong>number_waiting</strong> ⇒ Fixnum </a>
</span>
<span class="summary_desc"><div class='inline'><p>The number of threads currently waiting on the barrier.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#parties-instance_method" title="#parties (instance method)">#<strong>parties</strong> ⇒ Fixnum </a>
</span>
<span class="summary_desc"><div class='inline'><p>The number of threads needed to pass the barrier.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#reset-instance_method" title="#reset (instance method)">#<strong>reset</strong> ⇒ nil </a>
</span>
<span class="summary_desc"><div class='inline'><p>resets the barrier to its initial state If there is at least one waiting thread, it will be woken up, the <code>wait</code> method will return false and the barrier will be broken If the barrier is broken, this method restores it to the original state.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#wait-instance_method" title="#wait (instance method)">#<strong>wait</strong>(timeout = nil) ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'><p>Blocks on the barrier until the number of waiting threads is equal to <code>parties</code> or until <code>timeout</code> is reached or <code>reset</code> is called If a block has been passed to the constructor, it will be executed once by the last arrived thread before releasing the others.</p>
</div></span>
</li>
</ul>
<div id="constructor_details" class="method_details_list">
<h2>Constructor Details</h2>
<div class="method_details first">
<h3 class="signature first" id="initialize-instance_method">
#<strong>initialize</strong>(parties) { ... } ⇒ <tt><span class='object_link'><a href="" title="Concurrent::CyclicBarrier (class)">CyclicBarrier</a></span></tt>
</h3><div class="docstring">
<div class="discussion">
<p>Create a new <code>CyclicBarrier</code> that waits for <code>parties</code> threads</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>parties</span>
<span class='type'>(<tt>Fixnum</tt>)</span>
—
<div class='inline'><p>the number of parties</p>
</div>
</li>
</ul>
<p class="tag_title">Yields:</p>
<ul class="yield">
<li>
<span class='type'></span>
<div class='inline'><p>an optional block that will be executed that will be executed after
the last thread arrives and before the others are released</p>
</div>
</li>
</ul>
<p class="tag_title">Raises:</p>
<ul class="raise">
<li>
<span class='type'>(<tt>ArgumentError</tt>)</span>
—
<div class='inline'><p>if <code>parties</code> is not an integer or is less than zero</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
40
41
42
43
44
45
46</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/cyclic_barrier.rb', line 40</span>
<span class='kw'>def</span> <span class='id identifier rubyid_initialize'>initialize</span><span class='lparen'>(</span><span class='id identifier rubyid_parties'>parties</span><span class='comma'>,</span> <span class='op'>&</span><span class='id identifier rubyid_block'>block</span><span class='rparen'>)</span>
<span class='const'><span class='object_link'><a href="Utility.html" title="Concurrent::Utility (module)">Utility</a></span></span><span class='op'>::</span><span class='const'>NativeInteger</span><span class='period'>.</span><span class='id identifier rubyid_ensure_integer_and_bounds'>ensure_integer_and_bounds</span> <span class='id identifier rubyid_parties'>parties</span>
<span class='const'><span class='object_link'><a href="Utility.html" title="Concurrent::Utility (module)">Utility</a></span></span><span class='op'>::</span><span class='const'>NativeInteger</span><span class='period'>.</span><span class='id identifier rubyid_ensure_positive_and_no_zero'>ensure_positive_and_no_zero</span> <span class='id identifier rubyid_parties'>parties</span>
<span class='kw'>super</span><span class='lparen'>(</span><span class='op'>&</span><span class='kw'>nil</span><span class='rparen'>)</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='id identifier rubyid_ns_initialize'>ns_initialize</span> <span class='id identifier rubyid_parties'>parties</span><span class='comma'>,</span> <span class='op'>&</span><span class='id identifier rubyid_block'>block</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
</div>
<div id="instance_method_details" class="method_details_list">
<h2>Instance Method Details</h2>
<div class="method_details first">
<h3 class="signature first" id="broken?-instance_method">
#<strong>broken?</strong> ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
<p>A barrier can be broken when:</p>
<ul>
<li>a thread called the <code>reset</code> method while at least one other thread was waiting</li>
<li>at least one thread timed out on <code>wait</code> method</li>
</ul>
<p>A broken barrier can be restored using <code>reset</code> it's safer to create a new one</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Boolean</tt>)</span>
—
<div class='inline'><p>true if the barrier is broken otherwise false</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
105
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107</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/cyclic_barrier.rb', line 105</span>
<span class='kw'>def</span> <span class='id identifier rubyid_broken?'>broken?</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='ivar'>@generation</span><span class='period'>.</span><span class='id identifier rubyid_status'>status</span> <span class='op'>!=</span> <span class='symbol'>:waiting</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="number_waiting-instance_method">
#<strong>number_waiting</strong> ⇒ <tt>Fixnum</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Returns the number of threads currently waiting on the barrier</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Fixnum</tt>)</span>
—
<div class='inline'><p>the number of threads currently waiting on the barrier</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
54
55
56</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/cyclic_barrier.rb', line 54</span>
<span class='kw'>def</span> <span class='id identifier rubyid_number_waiting'>number_waiting</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='ivar'>@number_waiting</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="parties-instance_method">
#<strong>parties</strong> ⇒ <tt>Fixnum</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Returns the number of threads needed to pass the barrier</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Fixnum</tt>)</span>
—
<div class='inline'><p>the number of threads needed to pass the barrier</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
49
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51</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/cyclic_barrier.rb', line 49</span>
<span class='kw'>def</span> <span class='id identifier rubyid_parties'>parties</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='ivar'>@parties</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="reset-instance_method">
#<strong>reset</strong> ⇒ <tt>nil</tt>
</h3><div class="docstring">
<div class="discussion">
<p>resets the barrier to its initial state
If there is at least one waiting thread, it will be woken up, the <code>wait</code>
method will return false and the barrier will be broken
If the barrier is broken, this method restores it to the original state</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>nil</tt>)</span>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
95
96
97</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/cyclic_barrier.rb', line 95</span>
<span class='kw'>def</span> <span class='id identifier rubyid_reset'>reset</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='id identifier rubyid_ns_generation_done'>ns_generation_done</span> <span class='ivar'>@generation</span><span class='comma'>,</span> <span class='symbol'>:reset</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
</td>
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<div class="method_details ">
<h3 class="signature " id="wait-instance_method">
#<strong>wait</strong>(timeout = nil) ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Blocks on the barrier until the number of waiting threads is equal to
<code>parties</code> or until <code>timeout</code> is reached or <code>reset</code> is called
If a block has been passed to the constructor, it will be executed once by
the last arrived thread before releasing the others</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>timeout</span>
<span class='type'>(<tt>Fixnum</tt>)</span>
<em class="default">(defaults to: <tt>nil</tt>)</em>
—
<div class='inline'><p>the number of seconds to wait for the counter or
<code>nil</code> to block indefinitely</p>
</div>
</li>
</ul>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Boolean</tt>)</span>
—
<div class='inline'><p><code>true</code> if the <code>count</code> reaches zero else false on
<code>timeout</code> or on <code>reset</code> or if the barrier is broken</p>
</div>
</li>
</ul>
</div><table class="source_code">
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<td>
<pre class="lines">
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87</pre>
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<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/cyclic_barrier.rb', line 66</span>
<span class='kw'>def</span> <span class='id identifier rubyid_wait'>wait</span><span class='lparen'>(</span><span class='id identifier rubyid_timeout'>timeout</span> <span class='op'>=</span> <span class='kw'>nil</span><span class='rparen'>)</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='kw'>do</span>
<span class='kw'>return</span> <span class='kw'>false</span> <span class='kw'>unless</span> <span class='ivar'>@generation</span><span class='period'>.</span><span class='id identifier rubyid_status'>status</span> <span class='op'>==</span> <span class='symbol'>:waiting</span>
<span class='ivar'>@number_waiting</span> <span class='op'>+=</span> <span class='int'>1</span>
<span class='kw'>if</span> <span class='ivar'>@number_waiting</span> <span class='op'>==</span> <span class='ivar'>@parties</span>
<span class='ivar'>@action</span><span class='period'>.</span><span class='id identifier rubyid_call'>call</span> <span class='kw'>if</span> <span class='ivar'>@action</span>
<span class='id identifier rubyid_ns_generation_done'>ns_generation_done</span> <span class='ivar'>@generation</span><span class='comma'>,</span> <span class='symbol'>:fulfilled</span>
<span class='kw'>true</span>
<span class='kw'>else</span>
<span class='id identifier rubyid_generation'>generation</span> <span class='op'>=</span> <span class='ivar'>@generation</span>
<span class='kw'>if</span> <span class='id identifier rubyid_ns_wait_until'>ns_wait_until</span><span class='lparen'>(</span><span class='id identifier rubyid_timeout'>timeout</span><span class='rparen'>)</span> <span class='lbrace'>{</span> <span class='id identifier rubyid_generation'>generation</span><span class='period'>.</span><span class='id identifier rubyid_status'>status</span> <span class='op'>!=</span> <span class='symbol'>:waiting</span> <span class='rbrace'>}</span>
<span class='id identifier rubyid_generation'>generation</span><span class='period'>.</span><span class='id identifier rubyid_status'>status</span> <span class='op'>==</span> <span class='symbol'>:fulfilled</span>
<span class='kw'>else</span>
<span class='id identifier rubyid_ns_generation_done'>ns_generation_done</span> <span class='id identifier rubyid_generation'>generation</span><span class='comma'>,</span> <span class='symbol'>:broken</span><span class='comma'>,</span> <span class='kw'>false</span>
<span class='kw'>false</span>
<span class='kw'>end</span>
<span class='kw'>end</span>
<span class='kw'>end</span>
<span class='kw'>end</span></pre>
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