X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=docs%2Fusers_guide%2Fffi-chap.xml;h=b33e95abb6e67ee60164ad14d23f6f5832745eeb;hp=5ef50a65ae03ec68810d139ea99db4ff15204c85;hb=83d563cb9ede0ba792836e529b1e2929db926355;hpb=9fa96fc44a640014415e1588f50ab7689285e6cb;ds=sidebyside

diff --git a/docs/users_guide/ffi-chap.xml b/docs/users_guide/ffi-chap.xml
index 5ef50a6..b33e95a 100644
--- a/docs/users_guide/ffi-chap.xml
+++ b/docs/users_guide/ffi-chap.xml
@@ -476,6 +476,15 @@ int main(int argc, char *argv[])
           threads, but there may be an arbitrary number of foreign
           calls in progress at any one time, regardless of
           the <literal>+RTS -N</literal> value.</para>
+
+        <para>If a call is annotated as <literal>interruptible</literal>
+          and the program was multithreaded, the call may be
+          interrupted in the event that the Haskell thread receives an
+          exception.  The mechanism by which the interrupt occurs
+          is platform dependent, but is intended to cause blocking
+          system calls to return immediately with an interrupted error
+          code.  The underlying operating system thread is not to be
+          destroyed.</para>
       </sect3>
 
       <sect3 id="haskell-threads-and-os-threads">