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    CWG Issue 1173</TITLE>
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<P><EM>This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21
  Core Issues List revision 118b.
  See http://www.open-std.org/jtc1/sc22/wg21/ for the official
  list.</EM></P>
<P>2025-09-28</P>
<HR>
<A NAME="1173"></A><H4>1173.
  
Unclear specification of effects of signal handling
</H4>
<B>Section: </B>6.10.1&#160; [<A href="https://wg21.link/intro.execution">intro.execution</A>]
 &#160;&#160;&#160;

 <B>Status: </B>C++11
 &#160;&#160;&#160;

 <B>Submitter: </B>GB
 &#160;&#160;&#160;

 <B>Date: </B>2010-08-06<BR><BR>


<P>[Voted into the WP at the November, 2010 meeting.]</P>

<A href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3296.html#GB7">N3092 comment
  GB&#160;7<BR></A>

<P>The current wording of 6.10.1 [<A href="https://wg21.link/intro.execution#6">intro.execution</A>] paragraph 6 could
be read as saying that any signal would leave the program in an
unspecified state after completing.</P>

<P><B>Proposed resolution (August, 2010):</B></P>

<P>Change 6.10.1 [<A href="https://wg21.link/intro.execution#6">intro.execution</A>] paragraph 6 as follows:</P>

<BLOCKQUOTE>

<P>When the processing of the abstract machine is
interrupted by receipt of a signal, the values of objects
which are neither</P>

<UL>
<LI><P>of type <TT>volatile std::sig_atomic_t</TT> nor</P></LI>

<LI><P>lock-free atomic objects (32.5.5 [<A href="https://wg21.link/atomics.lockfree">atomics.lockfree</A>])</P></LI>

</UL>

<P>are unspecified <INS>during the execution of the signal
handler</INS>, and the value of any object not in either of
these two categories that is modified by the handler becomes
undefined.</P>

</BLOCKQUOTE>

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