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AtomicFixnum.html
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AtomicFixnum.html
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<!DOCTYPE html>
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Class: Concurrent::AtomicFixnum
— Concurrent Ruby
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<div id="content"><h1>Class: Concurrent::AtomicFixnum
</h1>
<div class="box_info">
<dl>
<dt>Inherits:</dt>
<dd>
<span class="inheritName"><span class='object_link'>AtomicFixnumImplementation</span></span>
<ul class="fullTree">
<li>Object</li>
<li class="next">Concurrent::AtomicFixnum</li>
</ul>
<a href="#" class="inheritanceTree">show all</a>
</dd>
</dl>
<dl>
<dt>Defined in:</dt>
<dd>lib/concurrent/atomic/atomic_fixnum.rb</dd>
</dl>
</div>
<h2>Overview</h2><div class="docstring">
<div class="discussion">
<p>A numeric value that can be updated atomically. Reads and writes to an atomic
fixnum and thread-safe and guaranteed to succeed. Reads and writes may block
briefly but no explicit locking is required.</p>
<h2>Thread-safe Variable Classes</h2>
<p>Each of the thread-safe variable classes is designed to solve a different
problem. In general:</p>
<ul>
<li><em><span class='object_link'><a href="Agent.html" title="Concurrent::Agent (class)">Agent</a></span>:</em> Shared, mutable variable providing independent,
uncoordinated, <em>asynchronous</em> change of individual values. Best used when
the value will undergo frequent, complex updates. Suitable when the result
of an update does not need to be known immediately.</li>
<li><em><span class='object_link'><a href="Atom.html" title="Concurrent::Atom (class)">Atom</a></span>:</em> Shared, mutable variable providing independent,
uncoordinated, <em>synchronous</em> change of individual values. Best used when
the value will undergo frequent reads but only occasional, though complex,
updates. Suitable when the result of an update must be known immediately.</li>
<li><em><span class='object_link'><a href="AtomicReference.html" title="Concurrent::AtomicReference (class)">AtomicReference</a></span>:</em> A simple object reference that can be
atomically. Updates are synchronous but fast. Best used when updates a
simple set operations. Not suitable when updates are complex.
<span class='object_link'><a href="AtomicBoolean.html" title="Concurrent::AtomicBoolean (class)">AtomicBoolean</a></span> and <span class='object_link'><a href="" title="Concurrent::AtomicFixnum (class)">AtomicFixnum</a></span> are similar
but optimized for the given data type.</li>
<li><em><span class='object_link'><a href="Exchanger.html" title="Concurrent::Exchanger (class)">Exchanger</a></span>:</em> Shared, stateless synchronization point. Used
when two or more threads need to exchange data. The threads will pair then
block on each other until the exchange is complete.</li>
<li><em><span class='object_link'><a href="MVar.html" title="Concurrent::MVar (class)">MVar</a></span>:</em> Shared synchronization point. Used when one thread
must give a value to another, which must take the value. The threads will
block on each other until the exchange is complete.</li>
<li><em><span class='object_link'><a href="ThreadLocalVar.html" title="Concurrent::ThreadLocalVar (class)">ThreadLocalVar</a></span>:</em> Shared, mutable, isolated variable which
holds a different value for each thread which has access. Often used as
an instance variable in objects which must maintain different state
for different threads.</li>
<li><em><span class='object_link'><a href="TVar.html" title="Concurrent::TVar (class)">TVar</a></span>:</em> Shared, mutable variables which provide
<em>coordinated</em>, <em>synchronous</em>, change of <em>many</em> stated. Used when multiple
value must change together, in an all-or-nothing transaction.
Performance:</li>
</ul>
<pre class="code ruby"><code class="ruby">Testing with ruby 2.1.2
Testing with Concurrent::MutexAtomicFixnum...
3.130000 0.000000 3.130000 ( 3.136505)
Testing with Concurrent::CAtomicFixnum...
0.790000 0.000000 0.790000 ( 0.785550)
Testing with jruby 1.9.3
Testing with Concurrent::MutexAtomicFixnum...
5.460000 2.460000 7.920000 ( 3.715000)
Testing with Concurrent::JavaAtomicFixnum...
4.520000 0.030000 4.550000 ( 1.187000)
</code></pre>
</div>
</div>
<div class="tags">
<p class="tag_title">See Also:</p>
<ul class="see">
<li><a href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/atomic/AtomicLong.html" target="_parent" title="java.util.concurrent.atomic.AtomicLong">java.util.concurrent.atomic.AtomicLong</a></li>
</ul>
</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="#compare_and_set-instance_method" title="#compare_and_set (instance method)">#<strong>compare_and_set</strong>(expect, update) ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'><p>Atomically sets the value to the given updated value if the current value == the expected value.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#decrement-instance_method" title="#decrement (instance method)">#<strong>decrement</strong>(delta) ⇒ Fixnum </a>
</span>
<span class="summary_desc"><div class='inline'><p>Decreases the current value by the given amount (defaults to 1).</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#increment-instance_method" title="#increment (instance method)">#<strong>increment</strong>(delta) ⇒ Fixnum </a>
</span>
<span class="summary_desc"><div class='inline'><p>Increases the current value by the given amount (defaults to 1).</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#initialize-instance_method" title="#initialize (instance method)">#<strong>initialize</strong>(initial = 0) ⇒ undocumented </a>
</span>
<span class="note title constructor">constructor</span>
<span class="summary_desc"><div class='inline'><p>Creates a new <code>AtomicFixnum</code> with the given initial value.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#to_s-instance_method" title="#to_s (instance method)">#<strong>to_s</strong> ⇒ String </a>
(also: #inspect)
</span>
<span class="summary_desc"><div class='inline'><p>Short string representation.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#update-instance_method" title="#update (instance method)">#<strong>update</strong> {|Object| ... } ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'><p>Pass the current value to the given block, replacing it with the block's result.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#value-instance_method" title="#value (instance method)">#<strong>value</strong> ⇒ Fixnum </a>
</span>
<span class="summary_desc"><div class='inline'><p>Retrieves the current <code>Fixnum</code> value.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#value=-instance_method" title="#value= (instance method)">#<strong>value=</strong>(value) ⇒ Fixnum </a>
</span>
<span class="summary_desc"><div class='inline'><p>Explicitly sets the value.</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>(initial = 0) ⇒ <tt>undocumented</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Creates a new <code>AtomicFixnum</code> with the given initial value.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>initial</span>
<span class='type'>(<tt>Fixnum</tt>)</span>
<em class="default">(defaults to: <tt>0</tt>)</em>
—
<div class='inline'><p>the initial value</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 the initial value is not a <code>Fixnum</code></p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
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</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/atomic_fixnum.rb', line 135</span>
<span class='kw'>class</span> <span class='const'><span class='object_link'><a href="" title="Concurrent::AtomicFixnum (class)">AtomicFixnum</a></span></span> <span class='op'><</span> <span class='const'>AtomicFixnumImplementation</span>
<span class='comment'># @return [String] Short string representation.
</span> <span class='kw'>def</span> <span class='id identifier rubyid_to_s'>to_s</span>
<span class='id identifier rubyid_format'>format</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>%s value:%s></span><span class='tstring_end'>'</span></span><span class='comma'>,</span> <span class='kw'>super</span><span class='lbracket'>[</span><span class='int'>0</span><span class='op'>..</span><span class='op'>-</span><span class='int'>2</span><span class='rbracket'>]</span><span class='comma'>,</span> <span class='id identifier rubyid_value'>value</span>
<span class='kw'>end</span>
<span class='id identifier rubyid_alias_method'>alias_method</span> <span class='symbol'>:inspect</span><span class='comma'>,</span> <span class='symbol'>:to_s</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="compare_and_set-instance_method">
#<strong>compare_and_set</strong>(expect, update) ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Atomically sets the value to the given updated value if the current
value == the expected value.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>expect</span>
<span class='type'>(<tt>Fixnum</tt>)</span>
—
<div class='inline'><p>the expected value</p>
</div>
</li>
<li>
<span class='name'>update</span>
<span class='type'>(<tt>Fixnum</tt>)</span>
—
<div class='inline'><p>the new value</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>true if the value was updated else false</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
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</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/atomic_fixnum.rb', line 135</span>
<span class='kw'>class</span> <span class='const'><span class='object_link'><a href="" title="Concurrent::AtomicFixnum (class)">AtomicFixnum</a></span></span> <span class='op'><</span> <span class='const'>AtomicFixnumImplementation</span>
<span class='comment'># @return [String] Short string representation.
</span> <span class='kw'>def</span> <span class='id identifier rubyid_to_s'>to_s</span>
<span class='id identifier rubyid_format'>format</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>%s value:%s></span><span class='tstring_end'>'</span></span><span class='comma'>,</span> <span class='kw'>super</span><span class='lbracket'>[</span><span class='int'>0</span><span class='op'>..</span><span class='op'>-</span><span class='int'>2</span><span class='rbracket'>]</span><span class='comma'>,</span> <span class='id identifier rubyid_value'>value</span>
<span class='kw'>end</span>
<span class='id identifier rubyid_alias_method'>alias_method</span> <span class='symbol'>:inspect</span><span class='comma'>,</span> <span class='symbol'>:to_s</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="decrement-instance_method">
#<strong>decrement</strong>(delta) ⇒ <tt>Fixnum</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Decreases the current value by the given amount (defaults to 1).</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>delta</span>
<span class='type'>(<tt>Fixnum</tt>)</span>
—
<div class='inline'><p>the amount by which to decrease the current value</p>
</div>
</li>
</ul>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Fixnum</tt>)</span>
—
<div class='inline'><p>the current value after decrementation</p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
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</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/atomic_fixnum.rb', line 135</span>
<span class='kw'>class</span> <span class='const'><span class='object_link'><a href="" title="Concurrent::AtomicFixnum (class)">AtomicFixnum</a></span></span> <span class='op'><</span> <span class='const'>AtomicFixnumImplementation</span>
<span class='comment'># @return [String] Short string representation.
</span> <span class='kw'>def</span> <span class='id identifier rubyid_to_s'>to_s</span>
<span class='id identifier rubyid_format'>format</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>%s value:%s></span><span class='tstring_end'>'</span></span><span class='comma'>,</span> <span class='kw'>super</span><span class='lbracket'>[</span><span class='int'>0</span><span class='op'>..</span><span class='op'>-</span><span class='int'>2</span><span class='rbracket'>]</span><span class='comma'>,</span> <span class='id identifier rubyid_value'>value</span>
<span class='kw'>end</span>
<span class='id identifier rubyid_alias_method'>alias_method</span> <span class='symbol'>:inspect</span><span class='comma'>,</span> <span class='symbol'>:to_s</span>
<span class='kw'>end</span></pre>
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</table>
</div>
<div class="method_details ">
<h3 class="signature " id="increment-instance_method">
#<strong>increment</strong>(delta) ⇒ <tt>Fixnum</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Increases the current value by the given amount (defaults to 1).</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">
<li>
<span class='name'>delta</span>
<span class='type'>(<tt>Fixnum</tt>)</span>
—
<div class='inline'><p>the amount by which to increase the current value</p>
</div>
</li>
</ul>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Fixnum</tt>)</span>
—
<div class='inline'><p>the current value after incrementation</p>
</div>
</li>
</ul>
</div><table class="source_code">
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<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/atomic_fixnum.rb', line 135</span>
<span class='kw'>class</span> <span class='const'><span class='object_link'><a href="" title="Concurrent::AtomicFixnum (class)">AtomicFixnum</a></span></span> <span class='op'><</span> <span class='const'>AtomicFixnumImplementation</span>
<span class='comment'># @return [String] Short string representation.
</span> <span class='kw'>def</span> <span class='id identifier rubyid_to_s'>to_s</span>
<span class='id identifier rubyid_format'>format</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>%s value:%s></span><span class='tstring_end'>'</span></span><span class='comma'>,</span> <span class='kw'>super</span><span class='lbracket'>[</span><span class='int'>0</span><span class='op'>..</span><span class='op'>-</span><span class='int'>2</span><span class='rbracket'>]</span><span class='comma'>,</span> <span class='id identifier rubyid_value'>value</span>
<span class='kw'>end</span>
<span class='id identifier rubyid_alias_method'>alias_method</span> <span class='symbol'>:inspect</span><span class='comma'>,</span> <span class='symbol'>:to_s</span>
<span class='kw'>end</span></pre>
</td>
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</table>
</div>
<div class="method_details ">
<h3 class="signature " id="to_s-instance_method">
#<strong>to_s</strong> ⇒ <tt>String</tt>
<span class="aliases">Also known as:
<span class="names"><span id='inspect-instance_method'>inspect</span></span>
</span>
</h3><div class="docstring">
<div class="discussion">
<p>Returns Short string representation.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>String</tt>)</span>
—
<div class='inline'><p>Short string representation.</p>
</div>
</li>
</ul>
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<tr>
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<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/atomic_fixnum.rb', line 137</span>
<span class='kw'>def</span> <span class='id identifier rubyid_to_s'>to_s</span>
<span class='id identifier rubyid_format'>format</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>%s value:%s></span><span class='tstring_end'>'</span></span><span class='comma'>,</span> <span class='kw'>super</span><span class='lbracket'>[</span><span class='int'>0</span><span class='op'>..</span><span class='op'>-</span><span class='int'>2</span><span class='rbracket'>]</span><span class='comma'>,</span> <span class='id identifier rubyid_value'>value</span>
<span class='kw'>end</span></pre>
</td>
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</table>
</div>
<div class="method_details ">
<h3 class="signature " id="update-instance_method">
#<strong>update</strong> {|Object| ... } ⇒ <tt>Object</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Pass the current value to the given block, replacing it
with the block's result. May retry if the value changes
during the block's execution.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Yields:</p>
<ul class="yield">
<li>
<span class='type'>(<tt>Object</tt>)</span>
—
<div class='inline'><p>Calculate a new value for the atomic reference using
given (old) value</p>
</div>
</li>
</ul>
<p class="tag_title">Yield Parameters:</p>
<ul class="yieldparam">
<li>
<span class='name'>old_value</span>
<span class='type'>(<tt>Object</tt>)</span>
—
<div class='inline'><p>the starting value of the atomic reference</p>
</div>
</li>
</ul>
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Object</tt>)</span>
—
<div class='inline'><p>the new value</p>
</div>
</li>
</ul>
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<tr>
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<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/atomic_fixnum.rb', line 135</span>
<span class='kw'>class</span> <span class='const'><span class='object_link'><a href="" title="Concurrent::AtomicFixnum (class)">AtomicFixnum</a></span></span> <span class='op'><</span> <span class='const'>AtomicFixnumImplementation</span>
<span class='comment'># @return [String] Short string representation.
</span> <span class='kw'>def</span> <span class='id identifier rubyid_to_s'>to_s</span>
<span class='id identifier rubyid_format'>format</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>%s value:%s></span><span class='tstring_end'>'</span></span><span class='comma'>,</span> <span class='kw'>super</span><span class='lbracket'>[</span><span class='int'>0</span><span class='op'>..</span><span class='op'>-</span><span class='int'>2</span><span class='rbracket'>]</span><span class='comma'>,</span> <span class='id identifier rubyid_value'>value</span>
<span class='kw'>end</span>
<span class='id identifier rubyid_alias_method'>alias_method</span> <span class='symbol'>:inspect</span><span class='comma'>,</span> <span class='symbol'>:to_s</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="value-instance_method">
#<strong>value</strong> ⇒ <tt>Fixnum</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Retrieves the current <code>Fixnum</code> value.</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 current value</p>
</div>
</li>
</ul>
</div><table class="source_code">
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<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/atomic_fixnum.rb', line 135</span>
<span class='kw'>class</span> <span class='const'><span class='object_link'><a href="" title="Concurrent::AtomicFixnum (class)">AtomicFixnum</a></span></span> <span class='op'><</span> <span class='const'>AtomicFixnumImplementation</span>
<span class='comment'># @return [String] Short string representation.
</span> <span class='kw'>def</span> <span class='id identifier rubyid_to_s'>to_s</span>
<span class='id identifier rubyid_format'>format</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>%s value:%s></span><span class='tstring_end'>'</span></span><span class='comma'>,</span> <span class='kw'>super</span><span class='lbracket'>[</span><span class='int'>0</span><span class='op'>..</span><span class='op'>-</span><span class='int'>2</span><span class='rbracket'>]</span><span class='comma'>,</span> <span class='id identifier rubyid_value'>value</span>
<span class='kw'>end</span>
<span class='id identifier rubyid_alias_method'>alias_method</span> <span class='symbol'>:inspect</span><span class='comma'>,</span> <span class='symbol'>:to_s</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="value=-instance_method">
#<strong>value=</strong>(value) ⇒ <tt>Fixnum</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Explicitly sets the value.</p>
</div>
</div>
<div class="tags">
<p class="tag_title">Parameters:</p>
<ul class="param">