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<a name="Groups-of-signals"></a>
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<p>
Next: <a href="The-deferral-mechanism.html#The-deferral-mechanism" accesskey="n" rel="next">The deferral mechanism</a>, Up: <a href="Signal-handling.html#Signal-handling" accesskey="u" rel="up">Signal handling</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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<a name="Groups-of-signals-1"></a>
<h3 class="section">7.1 Groups of signals</h3>

<p>There are two distinct groups of signals.
</p>
<a name="Synchronous-signals"></a>
<h4 class="subsection">7.1.1 Synchronous signals</h4>

<p>This group consists of signals that are raised on illegal instruction,
hitting a protected page, or on a trap. Examples from this group are:
<code>SIGBUS</code>/<code>SIGSEGV</code>, <code>SIGTRAP</code>, <code>SIGILL</code> and
<code>SIGEMT</code>. The exact meaning and function of these signals varies
by platform and OS. Understandably, because these signals are raised
in a controllable manner they are never blocked or deferred.
</p>
<a name="Asynchronous-or-blockable-signals"></a>
<h4 class="subsection">7.1.2 Asynchronous or blockable signals</h4>

<p>The other group is of blockable signals. Typically, signal handlers
block them to protect against being interrupted at all. For example
<code>SIGHUP</code>, <code>SIGINT</code>, <code>SIGQUIT</code> belong to this group.
</p>
<p>With the exception of <code>SIG_STOP_FOR_GC</code> all blockable signals are
deferrable.
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