glib-atomic-operations.html

glid编写实例

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<div class="refsect2" lang="en">
<a name="id2844151"></a><h3>
<a name="g-atomic-int-compare-and-exchange"></a>g_atomic_int_compare_and_exchange ()</h3>
<a class="indexterm" name="id2844163"></a><pre class="programlisting"><a href="glib-Basic-Types.html#gboolean">gboolean</a>    g_atomic_int_compare_and_exchange
                                            (<a href="glib-Basic-Types.html#gint">gint</a> *atomic,
                                             <a href="glib-Basic-Types.html#gint">gint</a> oldval,
                                             <a href="glib-Basic-Types.html#gint">gint</a> newval);</pre>
<p>
Compares <em class="parameter"><code>oldval</code></em> with the integer pointed to by <em class="parameter"><code>atomic</code></em> and
if they are equal, atomically exchanges *<em class="parameter"><code>atomic</code></em> with <em class="parameter"><code>newval</code></em>.
Also acts as a memory barrier.
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<td>
<span class="term"><em class="parameter"><code>atomic</code></em>&#160;:</span></td>
<td>a pointer to an integer.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>oldval</code></em>&#160;:</span></td>
<td>the assumed old value of *<em class="parameter"><code>atomic</code></em>.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>newval</code></em>&#160;:</span></td>
<td>the new value of *<em class="parameter"><code>atomic</code></em>.
</td>
</tr>
<tr>
<td>
<span class="term"><span class="emphasis"><em>Returns</em></span>&#160;:</span></td>
<td>
<code class="literal">TRUE</code>, if *<em class="parameter"><code>atomic</code></em> was equal <em class="parameter"><code>oldval</code></em>. <code class="literal">FALSE</code> otherwise.
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<p>Since 2.4


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<a name="id2844328"></a><h3>
<a name="g-atomic-pointer-get"></a>g_atomic_pointer_get ()</h3>
<a class="indexterm" name="id2844339"></a><pre class="programlisting"><a href="glib-Basic-Types.html#gpointer">gpointer</a>    g_atomic_pointer_get            (<a href="glib-Basic-Types.html#gpointer">gpointer</a> *atomic);</pre>
<p>
Reads the value of the pointer pointed to by <em class="parameter"><code>atomic</code></em>. Also acts as
a memory barrier.
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<td>
<span class="term"><em class="parameter"><code>atomic</code></em>&#160;:</span></td>
<td>a pointer to a <a href="glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>.
</td>
</tr>
<tr>
<td>
<span class="term"><span class="emphasis"><em>Returns</em></span>&#160;:</span></td>
<td>the value to add to *<em class="parameter"><code>atomic</code></em>.
</td>
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<p>Since 2.4


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<div class="refsect2" lang="en">
<a name="id2844421"></a><h3>
<a name="g-atomic-pointer-compare-and-exchange"></a>g_atomic_pointer_compare_and_exchange ()</h3>
<a class="indexterm" name="id2844433"></a><pre class="programlisting"><a href="glib-Basic-Types.html#gboolean">gboolean</a>    g_atomic_pointer_compare_and_exchange
                                            (<a href="glib-Basic-Types.html#gpointer">gpointer</a> *atomic,
                                             <a href="glib-Basic-Types.html#gpointer">gpointer</a> oldval,
                                             <a href="glib-Basic-Types.html#gpointer">gpointer</a> newval);</pre>
<p>
Compares <em class="parameter"><code>oldval</code></em> with the pointer pointed to by <em class="parameter"><code>atomic</code></em> and
if they are equal, atomically exchanges *<em class="parameter"><code>atomic</code></em> with <em class="parameter"><code>newval</code></em>. 
Also acts as a memory barrier.
</p>
<div class="variablelist"><table border="0">
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<td>
<span class="term"><em class="parameter"><code>atomic</code></em>&#160;:</span></td>
<td>a pointer to a <a href="glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>.
</td>
</tr>
<tr>
<td>
<span class="term"><em class="parameter"><code>oldval</code></em>&#160;:</span></td>
<td>the assumed old value of *<em class="parameter"><code>atomic</code></em>.
</td>
</tr>
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<td>
<span class="term"><em class="parameter"><code>newval</code></em>&#160;:</span></td>
<td>the new value of *<em class="parameter"><code>atomic</code></em>.
</td>
</tr>
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<td>
<span class="term"><span class="emphasis"><em>Returns</em></span>&#160;:</span></td>
<td>
<code class="literal">TRUE</code>, if *<em class="parameter"><code>atomic</code></em> was equal <em class="parameter"><code>oldval</code></em>. <code class="literal">FALSE</code> otherwise.
</td>
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<p>Since 2.4


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<div class="refsect2" lang="en">
<a name="id2844606"></a><h3>
<a name="g-atomic-int-inc"></a>g_atomic_int_inc ()</h3>
<a class="indexterm" name="id2844617"></a><pre class="programlisting">void        g_atomic_int_inc                (<a href="glib-Basic-Types.html#gint">gint</a> *atomic);</pre>
<p>
Atomically increments the integer pointed to by <em class="parameter"><code>atomic</code></em> by 1.
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<span class="term"><em class="parameter"><code>atomic</code></em>&#160;:</span></td>
<td>a pointer to an integer.
</td>
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<p>Since 2.4


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<div class="refsect2" lang="en">
<a name="id2844674"></a><h3>
<a name="g-atomic-int-dec-and-test"></a>g_atomic_int_dec_and_test ()</h3>
<a class="indexterm" name="id2844686"></a><pre class="programlisting"><a href="glib-Basic-Types.html#gboolean">gboolean</a>    g_atomic_int_dec_and_test       (<a href="glib-Basic-Types.html#gint">gint</a> *atomic);</pre>
<p>
Atomically decrements the integer pointed to by <em class="parameter"><code>atomic</code></em> by 1.
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<div class="variablelist"><table border="0">
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<span class="term"><em class="parameter"><code>atomic</code></em>&#160;:</span></td>
<td>a pointer to an integer.
</td>
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<td>
<span class="term"><span class="emphasis"><em>Returns</em></span>&#160;:</span></td>
<td>
<code class="literal">TRUE</code>, if the integer pointed to by <em class="parameter"><code>atomic</code></em> is 0 after
decrementing it.
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<p>Since 2.4


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<div class="refsect1" lang="en">
<a name="id2844766"></a><h2>See Also</h2>
<p>
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<td>
<span class="term"><a href="glib-Threads.html#GMutex"><span class="type">GMutex</span></a></span></td>
<td><p>GLib mutual exclusions.</p></td>
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