Date: Wed, 15 Apr 2015 03:02:06 +0000 (UTC) From: Benjamin Kaduk <bjk@FreeBSD.org> To: doc-committers@freebsd.org, svn-doc-all@freebsd.org, svn-doc-head@freebsd.org Subject: svn commit: r46553 - head/en_US.ISO8859-1/htdocs/news/status Message-ID: <201504150302.t3F326d4075529@svn.freebsd.org>
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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>kib@FreeBSD.org</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>
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