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UTS so that it can tell what thread is being signalled, and so that threads actually get signalled. This is basically a requirement for signals to KSE threads to be meaningful, rather than indeterministic and lossy exceptions. Approved by: mini
195 lines
5.5 KiB
Text
195 lines
5.5 KiB
Text
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" [
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<!ENTITY base CDATA "..">
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<!ENTITY date "$FreeBSD: www/en/kse/index.sgml,v 1.2 2002/11/04 02:05:12 mini Exp $">
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<!ENTITY title "FreeBSD KSE Project">
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<!ENTITY email 'mini'>
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<!ENTITY % includes SYSTEM "../includes.sgml"> %includes;
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<!-- Status levels -->
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<!ENTITY status.done "<font color=green>Done</font>">
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<!ENTITY status.wip "<font color=blue>In progress</font>">
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<!ENTITY status.stalled "<font color=purple>Stalled</font>">
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<!ENTITY status.new "<font color=red>Not Started</font>">
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<!ENTITY status.resolved "<font color=green>Resolved</font>">
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<!ENTITY status.unresolved "<font color=red>Unresolved</font>">
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<!-- The list of contributors was moved to a seperate file so that it can
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be used by other documents in the FreeBSD web site. -->
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<!ENTITY % developers SYSTEM "../developers.sgml"> %developers;
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]>
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<html>
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&header;
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<h2>Contents</h2>
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<ul>
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<li><a href="#overview">Project Overview</a></li>
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<li><a href="#using">Using KSE</a></li>
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<li><a href="#status.kernel">Project Status</a></li>
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</ul>
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<a name="plan"></a>
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<h2>Overview</h2>
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<p>Kernel Scheduler Entities (KSE), is a kernel-supported threading
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system similar in design to Scheduler Activations [Anderson, et. al.]. It
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strikes a balance between user-level (1:N) and kernel-level (1:1)
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threading models, giving most of the advantages of both, and
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few of the disadvantages of either.</p>
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<p>There are two halves of this project: kernel support and user
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support. The kernel support consists of modifications to the
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FreeBSD scheduler; The user half is a POSIX threads implementation
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which takes advantage of the extra facilities the kernel provides.</p>
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<p>The goal is to replace the current user threading system provided by
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the libc_r library, and the -pthread gcc option.
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<a name="using"></a>
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<h2>Using KSE</h2>
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<p>All KSE development is being done in 5.0-CURRENT. No special
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kernel configuration options are required to build a kernel with
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the KSE-related changes (the changes are inextricable from the
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FreeBSD scheduler).
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<p>In order to use KSE in an application, you need to link it against
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libpthreads, which is not built by default. To build and install it
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on your system, either run <tt>make install</tt> from
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<span class="filename">/usr/src/lib/libpthread</span> (if you have
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sources installed on your system), or check out the
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<span class="filename">libpthread</span> module from cvs.</p>
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<p>Linking an application against libpthread is straighforward. In its
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makefiles, change the <tt>-pthread</tt> option to <tt>-lpthread</tt>
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and relink. Alternatively, you can copy libpthread.so on top of
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libc_r.so, but this is not recommended until libpthread.so becomes a
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bit more stable.
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<a name="status"></a>
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<h2>Project Status</h2>
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<p>Following is an incomplete general list of tasks:</p>
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<table border=3>
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<tr>
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<th> Module </th>
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<th> Task </th>
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<th> Responsible </th>
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<th> Last updated </th>
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<th> Status </th>
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</tr>
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<tr>
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<td> libpthread </td>
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<td> Repo-copy the libpthread library from libc_r. </td>
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<td> cvs meister </td>
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<td> 16 September 2002 </td>
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<td> &status.done; </td>
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</tr>
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<tr>
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<td> libpthread </td>
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<td> Use KSE to schedule processes. </td>
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<td> &a.mini; </td>
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<td> 30 October 2002 </td>
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<td> &status.done; </td>
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</tr>
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<tr>
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<td> libpthread </td>
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<td> Schedule an idle context when appropriate. </td>
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<td> &a.mini; </td>
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<td> 2 November 2002 </td>
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<td> &status.wip; </td>
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</tr>
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<tr>
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<td> kernel </td>
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<td> Implement POSIX-style reliable and informative signals. </td>
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<td> &a.jmallett; </td>
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<td> 3 November 2002 </td>
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<td> &status.wip; </td>
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</tr>
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<tr>
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<td> libpthread </td>
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<td> Deliver signals to threads. </td>
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<td> </td>
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<td> 2 November 2002 </td>
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<td> &status.new; </td>
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</tr>
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<tr>
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<td> libpthread </td>
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<td> Locking for SMP. </td>
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<td> </td>
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<td> 2 November 2002 </td>
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<td> &status.new; </td>
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</tr>
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<tr>
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<td> kernel </td>
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<td> Locking for SMP. </td>
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<td> </td>
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<td> 2 November 2002 </td>
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<td> &status.new; </td>
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</tr>
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<tr>
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<td> libpthread </td>
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<td> Launch multiple KSEs (one per CPU). </td>
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<td> </td>
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<td> 2 November 2002 </td>
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<td> &status.new; </td>
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</tr>
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<tr>
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<td> libpthread </td>
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<td> Implement machine-dependant functions for non-x86 platforms. </td>
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<td> </td>
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<td> 2 November 2002 </td>
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<td> &status.new; </td>
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</tr>
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<tr>
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<td> kernel </td>
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<td> Implement machine-dependant functions for non-x86 platforms. </td>
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<td> </td>
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<td> 2 November 2002 </td>
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<td> &status.new; </td>
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</tr>
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<tr>
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<td> </td>
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<td> Port NetBSD's liblwp to FreeBSD/KSE. </td>
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<td> </td>
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<td> 2 November 2002 </td>
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<td> &status.new; </td>
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</tr>
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<tr>
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<td> kernel </td>
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<td> Signal the UTS with information about which thread it's for. </td>
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<td> </td>
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<td> 3 November 2002 </td>
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<td> &status.new; </td>
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</tr>
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<!--
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<tr>
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<td> </td>
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<td> </td>
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<td> </td>
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<td> D M 2002 </td>
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<td> &status.new; </td>
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</tr>
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-->
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</table>
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&footer;
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</body>
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</html>
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