svn commit: r46553 - head/en_US.ISO8859-1/htdocs/news/status
Benjamin Kaduk <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.cvs.doc |
|---|---|
| Message-ID | <[email protected]> |
Author: bjk
Date: Wed Apr 15 03:02:06 2015
New Revision: 46553
URL: https://svnweb.freebsd.org/changeset/doc/46553
Log:
Add report on loading libthr dynamically
Approved by: hrs (mentor, implicit)
Modified:
head/en_US.ISO8859-1/htdocs/news/status/report-2015-01-2015-03.xml
Modified: head/en_US.ISO8859-1/htdocs/news/status/report-2015-01-2015-03.xml
==============================================================================
--- head/en_US.ISO8859-1/htdocs/news/status/report-2015-01-2015-03.xml Wed Apr 15 02:23:52 2015 (r46552)
+++ head/en_US.ISO8859-1/htdocs/news/status/report-2015-01-2015-03.xml Wed Apr 15 03:02:06 2015 (r46553)
@@ -1802,4 +1802,53 @@ WITHOUT_FORTH=y</pre>
<sponsor>The &os; Foundation</sponsor>
</project>
+
+ <project cat='bin'>
+ <title>libthr improvements</title>
+
+ <contact>
+ <person>
+ <name>
+ <given>Konstantin</given>
+ <common>Belousov</common>
+ </name>
+ <email>[email protected]</email>
+ </person>
+ </contact>
+
+ <body>
+ <p>Historically, dynamic loading of the libthr.so thread
+ library into a single-threaded process did not work in &os;.
+ The longstanding recommendation to work-around the problem has
+ been to always link the main binary with -lpthread if there was
+ any chance of a need for threading functionality. This project
+ converted libthr.so into a plugin for libc, which fixed the
+ known issues preventing dynaic loading of libthr.so.</p>
+
+ <p>After the fix, linking the main binary with -lpthread is
+ no longer requred, but is not harmful. I recommend thoroughly
+ testing before removing libpthread from the libraries list in
+ favor of dynamic loading, though. Note that potential problems
+ will be subtle and their user-visible manifestations in the
+ affected program even more surprising.</p>
+
+ <p>The following issues were present in the old version of
+ libthr with respect to dynamic loading, but are fixed as
+ a result of this work:</p>
+
+ <ul>
+ <li>Invalid errno value seen after failed syscalls.</li>
+ <li>Broken libthr internal locks and critical sections ignored
+ by signals.</li>
+ <li>Hung attempts to lock mutexes.</li>
+ <li>Thread cancellation not occuring at guaranteed cancellation
+ points.</li>
+ </ul>
+
+ <p>The main change was committed as r276630 to HEAD, with many
+ follow ups. It was merged to stable/10 in r277317.</p>
+ </body>
+
+ <sponsor>The &os; Foundation</sponsor>
+ </project>
</report>
_______________________________________________
[email protected] mailing list
http://lists.freebsd.org/mailman/listinfo/svn-doc-all
To unsubscribe, send any mail to "[email protected]"