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authorhttps://me.yahoo.com/a/g3Ccalpj0NhN566pHbUl6i9QF0QEkrhlfPM-#b1c14 <diana@web>2015-02-16 20:08:03 +0100
committerGNU Hurd web pages engine <web-hurd@gnu.org>2015-02-16 20:08:03 +0100
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-[[!meta copyright="Copyright © 2010 Free Software Foundation, Inc."]]
-
-[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
-id="license" text="Permission is granted to copy, distribute and/or modify this
-document under the terms of the GNU Free Documentation License, Version 1.2 or
-any later version published by the Free Software Foundation; with no Invariant
-Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
-is included in the section entitled [[GNU Free Documentation
-License|/fdl]]."]]"""]]
-
-[[!tag open_issue_glibc open_issue_libpthread]]
-
-libpthread: glibc 44e2ad5ab8c21dbfed3e384ba2ed31d7a8fc4744
-998e5fc14595229101561d76282036839e5b66ab -- The robust mutex functions are in
-POSIX 2008.
-
----
-
-IRC, #hurd, unknown date.
-
- <youpi> neal: bad news: you remember the PTHREAD_RECURSIVE_MUTEX_INITIALIZER that points to a global __pthread_recursive_mutexattr?
- <youpi> that doesn't work
- <youpi> because some libraries like libstdc++ do not link against libpthread, while still using pthread_mutex_lock/unlock (counting on them being provided by either libc or libpthread-stubs)
- <CIA-1> sthibaul-guest * r626 pkg-hurd/hurd/trunk/debian/ (changelog patches/series):
- <CIA-1> * debian/patches/libpthread_rwlock_initializer.patch: Disable patch for now:
- <CIA-1> our initializer does not work when the application does not link against
- <CIA-1> libpthread.
-
- <CIA-1> sthibaul-guest * r629 pkg-hurd/hurd/trunk/debian/ (changelog patches/series): do not disable adding PTHREAD_RWLOCK_INITIALIZER, that's not the one that poses problems
- <CIA-1> sthibaul-guest * r630 pkg-hurd/hurd/trunk/debian/ (3 files in 2 dirs):
- <CIA-1> * debian/patches/libpthread_no_recursive_mutex_initializer.patch: New patch
- <CIA-1> to drop undefined references to __pthread_recursive_mutexattr.
-
- <youpi> I'm thinking about how to fix the PTHREAD_RECURSIVE_MUTEX_INITIALIZER
- <youpi> instead of a pointer to a static attribute variable, which posed problem
- <youpi> could we perhaps consider that page 0 is never mapped
- <youpi> and thus not only pointer 0 but also 1 2, etc. are invalid
- <neal> I think that is a good solution
- <youpi> and use them as special values
- <neal> alternatively, we could assume that -PAGESIZE is never valid
- <youpi> that makes us test it in all pthread_mutex_* functions, but it's not so bad
- <neal> I'm not sure which is better
- <youpi> why isn't it?
- <neal> because the kernel is mapped there normally
- <youpi> the kernel could be elsewhere
- <neal> true
- <youpi> in a 64bit adressing space for instance
- <neal> I think your solution is a good one
- <youpi> ok
-
- <CIA-1> sthibault * r633 pkg-hurd/hurd/trunk/debian/ (3 files in 2 dirs):
- <CIA-1> * debian/patches/libpthread_recursive_mutex_initializer.patch: New patch
- <CIA-1> to fix the recursive mutex initializers usage in libraries not linking
- <CIA-1> against libpthread.