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Event.html
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Event.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
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<title>
Class: Concurrent::Event
— Concurrent Ruby
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<span class="title">Event</span>
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<div id="content"><h1>Class: Concurrent::Event
</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::Event</li>
</ul>
<a href="#" class="inheritanceTree">show all</a>
</dd>
</dl>
<dl>
<dt>Defined in:</dt>
<dd>lib/concurrent/atomic/event.rb</dd>
</dl>
</div>
<h2>Overview</h2><div class="docstring">
<div class="discussion">
<p>Old school kernel-style event reminiscent of Win32 programming in C++.</p>
<p>When an <code>Event</code> is created it is in the <code>unset</code> state. Threads can choose to
<code>#wait</code> on the event, blocking until released by another thread. When one
thread wants to alert all blocking threads it calls the <code>#set</code> method which
will then wake up all listeners. Once an <code>Event</code> has been set it remains set.
New threads calling <code>#wait</code> will return immediately. An <code>Event</code> may be
<code>#reset</code> at any time once it has been set.</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_event'>event</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'>Event</span><span class='period'>.</span><span class='id identifier rubyid_new'><span class='object_link'><a href="#initialize-instance_method" title="Concurrent::Event#initialize (method)">new</a></span></span>
<span class='id identifier rubyid_t1'>t1</span> <span class='op'>=</span> <span class='const'>Thread</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span> <span class='kw'>do</span>
<span class='id identifier rubyid_puts'>puts</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>t1 is waiting</span><span class='tstring_end'>"</span></span>
<span class='id identifier rubyid_event'>event</span><span class='period'>.</span><span class='id identifier rubyid_wait'>wait</span><span class='lparen'>(</span><span class='int'>1</span><span class='rparen'>)</span>
<span class='id identifier rubyid_puts'>puts</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>event ocurred</span><span class='tstring_end'>"</span></span>
<span class='kw'>end</span>
<span class='id identifier rubyid_t2'>t2</span> <span class='op'>=</span> <span class='const'>Thread</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span> <span class='kw'>do</span>
<span class='id identifier rubyid_puts'>puts</span> <span class='tstring'><span class='tstring_beg'>"</span><span class='tstring_content'>t2 calling set</span><span class='tstring_end'>"</span></span>
<span class='id identifier rubyid_event'>event</span><span class='period'>.</span><span class='id identifier rubyid_set'>set</span>
<span class='kw'>end</span>
<span class='lbracket'>[</span><span class='id identifier rubyid_t1'>t1</span><span class='comma'>,</span> <span class='id identifier rubyid_t2'>t2</span><span class='rbracket'>]</span><span class='period'>.</span><span class='id identifier rubyid_each'>each</span><span class='lparen'>(</span><span class='op'>&</span><span class='symbol'>:join</span><span class='rparen'>)</span>
<span class='comment'># prints:
</span><span class='comment'># t2 calling set
</span><span class='comment'># t1 is waiting
</span><span class='comment'># event occurred</span></code></pre>
</div>
<p class="tag_title">See Also:</p>
<ul class="see">
<li><a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms682655.aspx" target="_parent" title="http://msdn.microsoft.com/en-us/library/windows/desktop/ms682655.aspx">http://msdn.microsoft.com/en-us/library/windows/desktop/ms682655.aspx</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="#initialize-instance_method" title="#initialize (instance method)">#<strong>initialize</strong> ⇒ Event </a>
</span>
<span class="note title constructor">constructor</span>
<span class="summary_desc"><div class='inline'><p>Creates a new <code>Event</code> in the unset state.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#reset-instance_method" title="#reset (instance method)">#<strong>reset</strong> ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'><p>Reset a previously set event back to the <code>unset</code> state.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#set-instance_method" title="#set (instance method)">#<strong>set</strong> ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'><p>Trigger the event, setting the state to <code>set</code> and releasing all threads waiting on the event.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#set%3F-instance_method" title="#set? (instance method)">#<strong>set?</strong> ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'><p>Is the object in the set state?.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#try%3F-instance_method" title="#try? (instance method)">#<strong>try?</strong> ⇒ Boolean </a>
</span>
<span class="summary_desc"><div class='inline'></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>Wait a given number of seconds for the <code>Event</code> to be set by another thread.</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> ⇒ <tt><span class='object_link'><a href="" title="Concurrent::Event (class)">Event</a></span></tt>
</h3><div class="docstring">
<div class="discussion">
<p>Creates a new <code>Event</code> in the unset state. Threads calling <code>#wait</code> on the
<code>Event</code> will block.</p>
</div>
</div>
<div class="tags">
</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/event.rb', line 40</span>
<span class='kw'>def</span> <span class='id identifier rubyid_initialize'>initialize</span>
<span class='kw'>super</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='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="reset-instance_method">
#<strong>reset</strong> ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Reset a previously set event back to the <code>unset</code> state.
Has no effect if the <code>Event</code> has not yet been set.</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>should always return <code>true</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/event.rb', line 68</span>
<span class='kw'>def</span> <span class='id identifier rubyid_reset'>reset</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='kw'>do</span>
<span class='kw'>if</span> <span class='ivar'>@set</span>
<span class='ivar'>@set</span> <span class='op'>=</span> <span class='kw'>false</span>
<span class='ivar'>@iteration</span> <span class='op'>+=</span><span class='int'>1</span>
<span class='kw'>end</span>
<span class='kw'>true</span>
<span class='kw'>end</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="set-instance_method">
#<strong>set</strong> ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Trigger the event, setting the state to <code>set</code> and releasing all threads
waiting on the event. Has no effect if the <code>Event</code> has already been set.</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>should always return <code>true</code></p>
</div>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
56
57
58</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/event.rb', line 56</span>
<span class='kw'>def</span> <span class='id identifier rubyid_set'>set</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='id identifier rubyid_ns_set'>ns_set</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="set?-instance_method">
#<strong>set?</strong> ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
<p>Is the object in the set state?</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>indicating whether or not the <code>Event</code> has been set</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/event.rb', line 48</span>
<span class='kw'>def</span> <span class='id identifier rubyid_set?'>set?</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='ivar'>@set</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="try?-instance_method">
#<strong>try?</strong> ⇒ <tt>Boolean</tt>
</h3><div class="docstring">
<div class="discussion">
</div>
</div>
<div class="tags">
<p class="tag_title">Returns:</p>
<ul class="return">
<li>
<span class='type'>(<tt>Boolean</tt>)</span>
</li>
</ul>
</div><table class="source_code">
<tr>
<td>
<pre class="lines">
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62</pre>
</td>
<td>
<pre class="code"><span class="info file"># File 'lib/concurrent/atomic/event.rb', line 60</span>
<span class='kw'>def</span> <span class='id identifier rubyid_try?'>try?</span>
<span class='id identifier rubyid_synchronize'>synchronize</span> <span class='lbrace'>{</span> <span class='ivar'>@set</span> <span class='op'>?</span> <span class='kw'>false</span> <span class='op'>:</span> <span class='id identifier rubyid_ns_set'>ns_set</span> <span class='rbrace'>}</span>
<span class='kw'>end</span></pre>
</td>
</tr>
</table>
</div>
<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>Wait a given number of seconds for the <code>Event</code> to be set by another
thread. Will wait forever when no <code>timeout</code> value is given. Returns
immediately if the <code>Event</code> has already been set.</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 <code>Event</code> was set before timeout 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/event.rb', line 83</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'>unless</span> <span class='ivar'>@set</span>
<span class='id identifier rubyid_iteration'>iteration</span> <span class='op'>=</span> <span class='ivar'>@iteration</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_iteration'>iteration</span> <span class='op'><</span> <span class='ivar'>@iteration</span> <span class='op'>||</span> <span class='ivar'>@set</span> <span class='rbrace'>}</span>
<span class='kw'>else</span>
<span class='kw'>true</span>
<span class='kw'>end</span>
<span class='kw'>end</span>
<span class='kw'>end</span></pre>
</td>
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