glib-atomic-operations.html

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<td><p><span class="term"><em class="parameter"><code>val</code></em>&#160;:</span></p></td>
<td>the value to add to *<em class="parameter"><code>atomic</code></em>.
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span>&#160;:</span></p></td>
<td>the value of *<em class="parameter"><code>atomic</code></em> before the addition.
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<p class="since">Since 2.4


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<a name="id2851757"></a><h3>
<a name="g-atomic-int-compare-and-exchange"></a>g_atomic_int_compare_and_exchange ()</h3>
<a class="indexterm" name="id2851773"></a><pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean">gboolean</a>            g_atomic_int_compare_and_exchange   (volatile <a class="link" href="glib-Basic-Types.html#gint">gint</a> *atomic,
                                                         <a class="link" href="glib-Basic-Types.html#gint">gint</a> oldval,
                                                         <a class="link" 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><p><span class="term"><em class="parameter"><code>atomic</code></em>&#160;:</span></p></td>
<td>a pointer to an integer.
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<td><p><span class="term"><em class="parameter"><code>oldval</code></em>&#160;:</span></p></td>
<td>the assumed old value of *<em class="parameter"><code>atomic</code></em>.
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<td><p><span class="term"><em class="parameter"><code>newval</code></em>&#160;:</span></p></td>
<td>the new value of *<em class="parameter"><code>atomic</code></em>.
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span>&#160;:</span></p></td>
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<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, if *<em class="parameter"><code>atomic</code></em> was equal <em class="parameter"><code>oldval</code></em>. <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise.
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<p class="since">Since 2.4


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<a name="id2851949"></a><h3>
<a name="g-atomic-pointer-get"></a>g_atomic_pointer_get ()</h3>
<a class="indexterm" name="id2851964"></a><pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a>            g_atomic_pointer_get                (volatile <a class="link" 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><p><span class="term"><em class="parameter"><code>atomic</code></em>&#160;:</span></p></td>
<td>a pointer to a <a class="link" href="glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>.
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span>&#160;:</span></p></td>
<td>the value to add to *<em class="parameter"><code>atomic</code></em>.
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<p class="since">Since 2.4


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<a name="id2852049"></a><h3>
<a name="g-atomic-pointer-set"></a>g_atomic_pointer_set ()</h3>
<a class="indexterm" name="id2852065"></a><pre class="programlisting">void                g_atomic_pointer_set                (volatile <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> *atomic,
                                                         <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> newval);</pre>
<p>
Sets 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><p><span class="term"><em class="parameter"><code>atomic</code></em>&#160;:</span></p></td>
<td>a pointer to a <a class="link" href="glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>
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<td><p><span class="term"><em class="parameter"><code>newval</code></em>&#160;:</span></p></td>
<td>the new value
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<p class="since">Since 2.10


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<a name="id2852156"></a><h3>
<a name="g-atomic-pointer-compare-and-exchange"></a>g_atomic_pointer_compare_and_exchange ()</h3>
<a class="indexterm" name="id2852172"></a><pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean">gboolean</a>            g_atomic_pointer_compare_and_exchange
                                                        (volatile <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> *atomic,
                                                         <a class="link" href="glib-Basic-Types.html#gpointer">gpointer</a> oldval,
                                                         <a class="link" 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.
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<td><p><span class="term"><em class="parameter"><code>atomic</code></em>&#160;:</span></p></td>
<td>a pointer to a <a class="link" href="glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a>.
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<td><p><span class="term"><em class="parameter"><code>oldval</code></em>&#160;:</span></p></td>
<td>the assumed old value of *<em class="parameter"><code>atomic</code></em>.
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<td><p><span class="term"><em class="parameter"><code>newval</code></em>&#160;:</span></p></td>
<td>the new value of *<em class="parameter"><code>atomic</code></em>.
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span>&#160;:</span></p></td>
<td>
<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, if *<em class="parameter"><code>atomic</code></em> was equal <em class="parameter"><code>oldval</code></em>. <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise.
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<p class="since">Since 2.4


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<a name="id2852356"></a><h3>
<a name="g-atomic-int-inc"></a>g_atomic_int_inc ()</h3>
<a class="indexterm" name="id2852372"></a><pre class="programlisting">void                g_atomic_int_inc                    (<a class="link" 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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<td><p><span class="term"><em class="parameter"><code>atomic</code></em>&#160;:</span></p></td>
<td>a pointer to an integer.
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<p class="since">Since 2.4


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<a name="id2852432"></a><h3>
<a name="g-atomic-int-dec-and-test"></a>g_atomic_int_dec_and_test ()</h3>
<a class="indexterm" name="id2852448"></a><pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gboolean">gboolean</a>            g_atomic_int_dec_and_test           (<a class="link" 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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<td><p><span class="term"><em class="parameter"><code>atomic</code></em>&#160;:</span></p></td>
<td>a pointer to an integer.
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span>&#160;:</span></p></td>
<td>
<a class="link" href="glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, if the integer pointed to by <em class="parameter"><code>atomic</code></em> is 0 after
decrementing it.
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<p class="since">Since 2.4


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<div class="refsect1" lang="en">
<a name="id2852535"></a><h2>See Also</h2>
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<td><p><span class="term"><a class="link" href="glib-Threads.html#GMutex"><span class="type">GMutex</span></a></span></p></td>
<td><p>GLib mutual exclusions.</p></td>
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<a name="id2852565"></a><div class="refsect2" lang="en"><a name="id2852566"></a></div>
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<div class="refsect2" lang="en"><a name="id2852567"></a></div>
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