thrd_{create,detach,exit,join}.
mtx_{init,destroy,lock,trylock,unlock,timeelock}.
cnd_{broadcast,destroy,init,signal,timewait,wait,destroy}
tss_{create,delete,get,set}. call_once.
Message-ID: <20251121191336.1224485-1-gfleury@disroot.org>

There is no new symbol version because of the compatibility symbol
status.

The support for lock elision was already deprecated with glibc 2.42:
commit 77438db8cfa6ee66b3906230156bdae11c49a195
"Mark support for lock elision as deprecated."
See also discussions:
https://sourceware.org/pipermail/libc-alpha/2025-July/168492.html

This patch removes the architecture specific support for lock elision
for x86, powerpc and s390 by removing the elision-conf.h, elision-conf.c,
elision-lock.c, elision-timed.c, elision-unlock.c, elide.h, htm.h/hle.h files.
Those generic files are also removed.

The architecture specific structures are adjusted and the elision fields are
marked as unused.  See struct_mutex.h files.
Furthermore in struct_rwlock.h, the leftover __rwelision was also removed.
Those were originally removed with commit 0377a7fde6dfcc078dda29a1225d7720a0931357
"nptl: Remove rwlock elision definitions"
and by chance reintroduced with commit 7df8af43ad1cd8ce527444de50bee6f35eebe071
"nptl: Add struct_rwlock.h"

The common code (e.g. the pthread_mutex-files) are changed back to the time
before lock elision was introduced with the x86-support:
- commit 1cdbe579482c07e9f4bb3baa4864da2d3e7eb837
"Add the low level infrastructure for pthreads lock elision with TSX"
- commit b023e4ca99f5e81f90d87d23cd267ef2abd2388c
"Add new internal mutex type flags for elision."
- commit 68cc29355f3334c7ad18f648ff9a6383a0916d23
"Add minimal test suite changes for elision enabled kernels"
- commit e8c659d74e011346785355eeef03b7fb6f533c61
"Add elision to pthread_mutex_{try,timed,un}lock"
- commit 49186d21ef2d87986bccaf0a7c45c48c91b265f3
"Disable elision for any pthread_mutexattr_settype call"
- commit 1717da59aed9612becd56aaa1249aac695af4c8a
"Add a configure option to enable lock elision and disable by default"

Elision is removed also from the tunables, the initialization part, the
pretty-printers and the manual.

Some extra handling in the testsuite is removed as well as the full tst-mutex10
testcase, which tested a race while enabling lock elision.

I've also searched the code for "elision", "elide", "transaction" and e.g.
cleaned some comments.

I've run the testsuite on x86_64 and s390x and run the build-many-glibcs.py
script.
Thanks to Sachin Monga, this patch is also tested on powerpc.

A NEWS entry also mentions the removal.
Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>

C23 adds once_flag, ONCE_FLAG_INIT and call_once to stdlib.h (in C11
they were only in threads.h, in C23 they are in both headers; this
change came from N2840).  Implement this change, with a
bits/types/once_flag.h header for the common type and initializer
definitions.

Note that there's an omnibus bug (bug 33001) that covers more than
just these missing definitions.

This doesn't seem a significant enough feature to be worth mentioning
in NEWS.

ISO C is not concerned with whether functions are in libc or
libpthread, but POSIX links this to what header they are declared in,
so functions declared in stdlib.h are supposed to be in libc.
However, the current edition of POSIX is based on C17; hopefully Hurd
glibc will have completed the merge of libpthread into libc (in
particular, moving call_once) well before a future edition of POSIX
based on C23 (or a later version of ISO C) is released.

Tested for x86_64 and x86.

Both NPTL and HTL support PTHREAD_PROCESS_SHARED, and since the removal of
the NaCL port there are no other pthread implementations.

Message-ID: <20250817104023.91919-8-gfleury@disroot.org>

Message-ID: <20250817104023.91919-5-gfleury@disroot.org>

Update tst-fopen-threaded.c to call support_create_temp_directory to
create a temporary directory and open "file" in the temporary directory,
instead of using /tmp/openclosetest and leaving it behind.

This partially fixes BZ #33182.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

And add extra checks to enable for binutils 2.45 and if the architecture
explicitly enables it.  When SFrame is disabled, all the related code
is also not enabled for backtrace() and _dl_find_object(), so SFrame
backtracking is not used even if the binary has the SFrame segment.

This patch also adds some other related fixes:

  * Fixed an issue with AC_CHECK_PROG_VER, where the READELF_SFRAME
    usage prevented specifying a different readelf through READELF
    environment variable at configure time.

  * Add an extra arch-specific internal definition,
    libc_cv_support_sframe, to disable --enable-sframe on architectures
    that have binutils but not glibc support (s390x).

  * Renamed the tests without the .sframe segment and move the
    tst-backtrace1 from pthread to debug.

  * Use the built compiler strip to remove the .sframe segment,
    instead of the system one (which might not support SFrame).

Checked on x86_64-linux-gnu and aarch64-linux-gnu.

Reviewed-by: Sam James <sam@gentoo.org>