Add a --supported-languages flag

[ghc-hetmet.git] / docs / users_guide / runtime_control.xml

diff --git a/docs/users_guide/runtime_control.xml b/docs/users_guide/runtime_control.xml
index 7b60167..95365ba 100644 (file)
--- a/docs/users_guide/runtime_control.xml
+++ b/docs/users_guide/runtime_control.xml
@@ -97,7 +97,7 @@
          <para>Sets the interval that the RTS clock ticks at.  The
          runtime uses a single timer signal to count ticks; this timer
          signal is used to control the context switch timer (<xref
-         linkend="sec-using-concurrent" />) and the heap profiling
+         linkend="using-concurrent" />) and the heap profiling
          timer <xref linkend="rts-options-heap-prof" />.  Also, the
          time profiler uses the RTS timer signal directly to record
          time profiling samples.</para>
@@ -108,6 +108,26 @@
          the <option>-C</option> or <option>-i</option> options.
          However, setting <option>-V</option> is required in order to
          increase the resolution of the time profiler.</para>
+
+         <para>Using a value of zero disables the RTS clock
+         completetly, and has the effect of disabling timers that
+         depend on it: the context switch timer and the heap profiling
+         timer.  Context switches will still happen, but
+         deterministically and at a rate much faster than normal.
+         Disabling the interval timer is useful for debugging, because
+         it eliminates a source of non-determinism at runtime.</para>
+       </listitem>
+     </varlistentry>
+
+     <varlistentry>
+       <term><option>--install-signal-handlers=<replaceable>yes|no</replaceable></option>
+       <indexterm><primary><option>--install-signal-handlers</option></primary><secondary>RTS
+       option</secondary></indexterm></term>
+       <listitem>
+         <para>If yes (the default), the RTS installs signal handlers to catch
+         things like ctrl-C. This option is primarily useful for when
+         you are using the Haskell code as a DLL, and want to set your
+         own signal handlers.</para>
        </listitem>
      </varlistentry>
     </variablelist>
@@ -430,7 +450,7 @@
 
     <para>The RTS options related to profiling are described in <xref
     linkend="rts-options-heap-prof"/>, those for concurrency in
-      <xref linkend="sec-using-concurrent" />, and those for parallelism in
+      <xref linkend="using-concurrent" />, and those for parallelism in
       <xref linkend="parallel-options"/>.</para>
   </sect2>