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Diffstat (limited to 'open_issues/libpthread_addon.mdwn')
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diff --git a/open_issues/libpthread_addon.mdwn b/open_issues/libpthread_addon.mdwn deleted file mode 100644 index 3a10cbde..00000000 --- a/open_issues/libpthread_addon.mdwn +++ /dev/null @@ -1,135 +0,0 @@ -[[!meta copyright="Copyright © 2012, 2013 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]]."]]"""]] - -[[!meta title="libpthread as glibc addon"]] - -[[!tag open_issue_glibc open_issue_libpthread]] - -This page lists all the notes, issues, etc, only about compiling libpthread -as addon for glibc, *not* for general libpthread issues. - -# Building - -To build libpthread as glibc addon, copy libpthread inside the glibc tree, -and then tell glibc's configure to use it: - - $ cp /path/to/libpthread libpthread - $ ./configure [...] --enable-add-ons=[...],libpthread - -Currently, it is build like that in Debian since eglibc 2.13-31. - -# Issues and notes - -### `bits/` headers not used - -Recompiling glibc (e.g. on a Debian system) and running the -`check-local-headers` test, `check-local-headers.out` shows: - - *** $(common-objpfx)elf/tst-thrlock.o: uses /usr/include/i386-gnu/bits/pthread.h - *** $(common-objpfx)elf/tst-thrlock.o: uses /usr/include/i386-gnu/bits/thread-attr.h - *** $(common-objpfx)elf/tst-thrlock.o: uses /usr/include/i386-gnu/bits/mutex-attr.h - *** $(common-objpfx)elf/tst-thrlock.o: uses /usr/include/i386-gnu/bits/mutex.h - *** $(common-objpfx)elf/tst-thrlock.o: uses /usr/include/i386-gnu/bits/condition-attr.h - *** $(common-objpfx)elf/tst-thrlock.o: uses /usr/include/i386-gnu/bits/condition.h - *** $(common-objpfx)elf/tst-thrlock.o: uses /usr/include/i386-gnu/bits/rwlock-attr.h - *** $(common-objpfx)elf/tst-thrlock.o: uses /usr/include/i386-gnu/bits/rwlock.h - *** $(common-objpfx)elf/tst-thrlock.o: uses /usr/include/i386-gnu/bits/barrier-attr.h - *** $(common-objpfx)elf/tst-thrlock.o: uses /usr/include/i386-gnu/bits/barrier.h - *** $(common-objpfx)elf/tst-thrlock.o: uses /usr/include/i386-gnu/bits/thread-specific.h - *** $(common-objpfx)elf/tst-thrlock.o: uses /usr/include/i386-gnu/bits/once.h - *** $(common-objpfx)elf/tst-thrlock.o: uses /usr/include/i386-gnu/bits/cancelation.h - *** $(common-objpfx)elf/tst-thrlock.o: uses /usr/include/i386-gnu/bits/pthread-np.h - -This happens because these headers are in the `bits/` subdirectory in -`sysdeps/generic` -- a `generic` sysdep is used only for the top-level -`sysdeps` directory in glibc. - -### Use of hurd's libihash - -libpthread makes use of the ihash hurd library, as also glibc's -`check-local-headers` test shows: - - *** $(common-objpfx)libpthread/pt-alloc.o: uses /usr/include/hurd/ihash.h - -Possible alternatives: [[hurd/libihash]]. - -### Executable stack - -Running glibc's `check-execstack` test gives in `check-execstack.out`: - - $BUILDDIR/libpthread/libpthread.so.phdr: *** executable stack signaled - -### Extra PLT references - -Running glibc's `check-localplt` test gives in `check-localplt.out`: - - Extra PLT reference: libpthread.so: pthread_detach - Extra PLT reference: libpthread.so: pthread_mutex_lock - Extra PLT reference: libpthread.so: pthread_mutexattr_settype - Extra PLT reference: libpthread.so: pthread_rwlock_rdlock - Extra PLT reference: libpthread.so: _pthread_spin_lock - Extra PLT reference: libpthread.so: pthread_attr_setstacksize - Extra PLT reference: libpthread.so: pthread_attr_getstacksize - Extra PLT reference: libpthread.so: pthread_attr_getstackaddr - Extra PLT reference: libpthread.so: pthread_attr_setstackaddr - Extra PLT reference: libpthread.so: pthread_exit - Extra PLT reference: libpthread.so: pthread_getspecific - Extra PLT reference: libpthread.so: __mutex_lock_solid - Extra PLT reference: libpthread.so: pthread_mutex_unlock - Extra PLT reference: libpthread.so: pthread_setcanceltype - Extra PLT reference: libpthread.so: pthread_key_create - Extra PLT reference: libpthread.so: pthread_cond_wait - Extra PLT reference: libpthread.so: pthread_rwlock_wrlock - Extra PLT reference: libpthread.so: pthread_once - Extra PLT reference: libpthread.so: pthread_cond_broadcast - Extra PLT reference: libpthread.so: pthread_setspecific - Extra PLT reference: libpthread.so: __pthread_get_cleanup_stack - Extra PLT reference: libpthread.so: pthread_rwlock_unlock - Extra PLT reference: libpthread.so: pthread_create - Extra PLT reference: libpthread.so: pthread_mutex_init - Extra PLT reference: libpthread.so: pthread_mutexattr_init - Extra PLT reference: libpthread.so: __mutex_unlock_solid - Extra PLT reference: libpthread.so: pthread_mutexattr_destroy - Extra PLT reference: libpthread.so: pthread_setcancelstate - -### `bits/posix_opt.h` - -`bits/posix_opt.h` is the glibc header defining the various -supported/unsupported `_POSIX_*` defines (e.g. `_POSIX_THREADS`, etc). - -Currently, glibc's `sysdeps/mach/hurd/bits/posix_opt.h` is patched in Debian -to add all the defines advertizing thread-related support. -An idea to avoid this would be to follow what is done in NPTL, and do the -following: - - - in glibc: leave `sysdeps/mach/hurd/bits/posix_opt.h` with *no* -thread-related macros at all. - - - in libpthread: provide `sysdeps/mach/hurd/bits/posix_opt.h` which would -be a copy of glibc's `sysdeps/mach/hurd/bits/posix_opt.h` with also the thread -macros. - -This approach would have the drawback that changes in the glibc header must be -mirrored also in the libpthread version, but with the advantage that defines -according to supported features in libpthread can be added in libpthread's own -version (and glibc would pick it automatically). - -### Tests - -The (few) existing tests are not built (thus neither run) just like other tests -in glibc. - -### `gai_misc.h` - -A pthread version of `gai_misc.h` must be provided by libpthread (just like -NPTL provides one), either in `sysdeps/mach/hurd` or `sysdeps/pthread` -(better). - -Currently, it is provided in glibc itself in Debian. |