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  17     "><link rel="home" href="../index.html" title="The GNU C++ Library"><link rel="up" href="parallel_mode.html" title="Chapter 18. Parallel Mode"><link rel="prev" href="parallel_mode.html" title="Chapter 18. Parallel Mode"><link rel="next" href="bk01pt03ch18s03.html" title="Using"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Semantics</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="parallel_mode.html">Prev</a> </td><th width="60%" align="center">Chapter 18. Parallel Mode</th><td width="20%" align="right"> <a accesskey="n" href="bk01pt03ch18s03.html">Next</a></td></tr></table><hr></div><div class="section" title="Semantics"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="manual.ext.parallel_mode.semantics"></a>Semantics</h2></div></div></div><p> The parallel mode STL algorithms are currently not exception-safe,
  18 i.e. user-defined functors must not throw exceptions.
  19 Also, the order of execution is not guaranteed for some functions, of course.
  20 Therefore, user-defined functors should not have any concurrent side effects.
  21 </p><p> Since the current GCC OpenMP implementation does not support
  22 OpenMP parallel regions in concurrent threads,
  23 it is not possible to call parallel STL algorithm in
  24 concurrent threads, either.
  25 It might work with other compilers, though.</p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="parallel_mode.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="parallel_mode.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="bk01pt03ch18s03.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 18. Parallel Mode </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Using</td></tr></table></div></body></html>