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In <https://sourceware.org/ml/libc-alpha/2014-01/msg00196.html> I
noted it was necessary to add includes of Makeconfig early in various
subdirectory makefiles for the tests-special variable settings added
by that patch to be conditional on configuration information. No-one
commented on the general question there of whether Makeconfig should
always be included immediately after the definition of subdir.
This patch implements that early inclusion of Makeconfig in each
directory (which is a lot easier than consistent placement of includes
of Rules). Includes are added if needed, or moved up if already
present. Subdirectory "all:" targets are removed, since Makeconfig
provides one.
There is potential for further cleanups I haven't done. Rules and
Makerules have code such as
ifneq "$(findstring env,$(origin headers))" ""
headers :=
endif
to override to empty any value of various variables that came from the
environment. I think there is a case for Makeconfig setting all the
subdirectory variables (other than subdir) to empty to ensure no
outside value is going to take effect if a subdirectory fails to
define a variable. (A list of such variables, possibly out of date
and incomplete, is in manual/maint.texi.) Rules and Makerules would
give errors if Makeconfig hadn't already been included, instead of
including it themselves. The special code to override values coming
from the environment would then be obsolete and could be removed.
Tested x86_64, including that installed binaries are identical before
and after the patch.
* argp/Makefile: Include Makeconfig immediately after defining
subdir.
* assert/Makefile: Likewise.
* benchtests/Makefile: Likewise.
* catgets/Makefile: Likewise.
* conform/Makefile: Likewise.
* crypt/Makefile: Likewise.
* csu/Makefile: Likewise.
(all): Remove target.
* ctype/Makefile: Include Makeconfig immediately after defining
subdir.
* debug/Makefile: Likewise.
* dirent/Makefile: Likewise.
* dlfcn/Makefile: Likewise.
* gmon/Makefile: Likewise.
* gnulib/Makefile: Likewise.
* grp/Makefile: Likewise.
* gshadow/Makefile: Likewise.
* hesiod/Makefile: Likewise.
* hurd/Makefile: Likewise.
(all): Remove target.
* iconvdata/Makefile: Include Makeconfig immediately after
defining subdir.
* inet/Makefile: Likewise.
* intl/Makefile: Likewise.
* io/Makefile: Likewise.
* libio/Makefile: Likewise.
(all): Remove target.
* locale/Makefile: Include Makeconfig immediately after defining
subdir.
* login/Makefile: Likewise.
* mach/Makefile: Likewise.
(all): Remove target.
* malloc/Makefile: Include Makeconfig immediately after defining
subdir.
(all): Remove target.
* manual/Makefile: Include Makeconfig immediately after defining
subdir.
* math/Makefile: Likewise.
* misc/Makefile: Likewise.
* nis/Makefile: Likewise.
* nss/Makefile: Likewise.
* po/Makefile: Likewise.
(all): Remove target.
* posix/Makefile: Include Makeconfig immediately after defining
subdir.
* pwd/Makefile: Likewise.
* resolv/Makefile: Likewise.
* resource/Makefile: Likewise.
* rt/Makefile: Likewise.
* setjmp/Makefile: Likewise.
* shadow/Makefile: Likewise.
* signal/Makefile: Likewise.
* socket/Makefile: Likewise.
* soft-fp/Makefile: Likewise.
* stdio-common/Makefile: Likewise.
* stdlib/Makefile: Likewise.
* streams/Makefile: Likewise.
* string/Makefile: Likewise.
* sunrpc/Makefile: Likewise.
(all): Remove target.
* sysvipc/Makefile: Include Makeconfig immediately after defining
subdir.
* termios/Makefile: Likewise.
* time/Makefile: Likewise.
* timezone/Makefile: Likewise.
(all): Remove target.
* wcsmbs/Makefile: Include Makeconfig immediately after defining
subdir.
* wctype/Makefile: Likewise.
libidn/ChangeLog:
* Makefile: Include Makeconfig immediately after defining subdir.
localedata/ChangeLog:
* Makefile: Include Makeconfig immediately after defining subdir.
(all): Remove target.
nptl/ChangeLog:
* Makefile: Include Makeconfig immediately after defining subdir.
nptl_db/ChangeLog:
* Makefile: Include Makeconfig immediately after defining subdir.
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This patch, an updated version of
<https://sourceware.org/ml/libc-alpha/2014-01/msg00194.html> now
proposed for inclusion in glibc, extends the generation of PASS and
FAIL status in .test-result files for individual tests to cover tests
with their own custom makefile rules. This is just adding
$(evaluate-test) calls to all such rules, since tests with multiple
commands were previously split into separate tests.
Note that the tests the makefiles expect to fail (posix/annexc and
conformtest) currently get FAIL listed in the .test-result file,
rather than XFAIL; a subsequent patch will introduce a better XFAIL
mechanism.
Tested x86_64.
* Makefile ($(objpfx)c++-types-check.out): Use $(evaluate-test).
($(objpfx)check-local-headers.out): Likewise.
($(objpfx)begin-end-check.out): Likewise.
* Makerules (check-abi-%.out): Likewise.
* catgets/Makefile ($(objpfx)test1.cat): Likewise.
($(objpfx)test2.cat): Likewise.
($(objpfx)de/libc.cat): Likewise.
($(objpfx)test-gencat.out): Likewise.
* conform/Makefile ($(objpfx)run-conformtest.out): Likewise.
* elf/Makefile ($(objpfx)order-cmp.out): Likewise.
($(objpfx)noload-mem): Likewise.
($(objpfx)tst-pathopt.out): Likewise.
($(objpfx)tst-rtld-load-self.out): Likewise.
($(objpfx)tst-array1-cmp.out): Likewise.
($(objpfx)tst-array1-static-cmp.out): Likewise.
($(objpfx)tst-array2-cmp.out): Likewise.
($(objpfx)tst-array3-cmp.out): Likewise.
($(objpfx)tst-array4-cmp.out): Likewise.
($(objpfx)tst-array5-cmp.out): Likewise.
($(objpfx)tst-array5-static-cmp.out): Likewise.
($(objpfx)check-textrel.out): Likewise.
($(objpfx)check-execstack.out): Likewise.
($(objpfx)check-localplt.out): Likewise.
($(objpfx)order2-cmp.out): Likewise.
($(objpfx)tst-leaks1-mem): Likewise.
($(objpfx)tst-leaks1-static-mem): Likewise.
($(objpfx)tst-initorder-cmp.out): Likewise.
($(objpfx)tst-initorder2-cmp.out): Likewise.
($(objpfx)tst-unused-dep.out): Likewise.
($(objpfx)tst-unused-dep-cmp.out): Likewise.
* grp/Makefile ($(objpfx)tst_fgetgrent.out): Likewise.
* iconv/Makefile (test-iconvconfig): Likewise.
* iconvdata/Makefile ($(objpfx)mtrace-tst-loading): Likewise.
($(objpfx)iconv-test.out): Likewise.
($(objpfx)tst-tables.out): Likewise.
* intl/Makefile ($(objpfx)mtrace-tst-gettext): Likewise.
($(objpfx)tst-gettext.out): Likewise.
($(objpfx)tst-translit.out): Likewise.
($(objpfx)tst-gettext2.out): Likewise.
($(objpfx)tst-gettext4.out): Likewise.
($(objpfx)tst-gettext6.out): Likewise.
* io/Makefile ($(objpfx)ftwtest.out): Likewise.
* libio/Makefile ($(objpfx)test-freopen.out): Likewise.
($(objpfx)tst-fopenloc-cmp.out): Likewise.
($(objpfx)tst-fopenloc-mem.out): Likewise.
* malloc/Makefile ($(objpfx)tst-mtrace.out): Likewise.
* misc/Makefile ($(objpfx)tst-error1-mem): Likewise.
* posix/Makefile ($(objpfx)globtest.out): Likewise.
($(objpfx)wordexp-tst.out): Likewise.
($(objpfx)annexc.out): Likewise.
($(objpfx)tst-fnmatch-mem): Likewise.
($(objpfx)bug-regex2-mem): Likewise.
($(objpfx)bug-regex14-mem): Likewise.
($(objpfx)bug-regex21-mem): Likewise.
($(objpfx)bug-regex31-mem): Likewise.
($(objpfx)tst-vfork3-mem): Likewise.
($(objpfx)tst-rxspencer-no-utf8-mem): Likewise.
($(objpfx)tst-pcre-mem): Likewise.
($(objpfx)tst-boost-mem): Likewise.
($(objpfx)tst-getconf.out): Likewise.
($(objpfx)bug-ga2-mem): Likewise.
($(objpfx)bug-glob2-mem): Likewise.
* resolv/Makefile ($(objpfx)mtrace-tst-leaks): Likewise.
($(objpfx)mtrace-tst-leaks2): Likewise.
* stdio-common/Makefile ($(objpfx)tst-unbputc.out): Likewise.
($(objpfx)tst-printf.out): Likewise.
($(objpfx)tst-setvbuf1.out): Likewise.
($(objpfx)tst-setvbuf1-cmp.out): Likewise.
* stdlib/Makefile ($(objpfx)isomac.out): Likewise.
($(objpfx)tst-fmtmsg.out): Likewise.
* string/Makefile ($(objpfx)tst-svc-cmp.out): Likewise.
* sysdeps/x86/Makefile ($(objpfx)tst-xmmymm.out): Likewise.
localedata:
* Makefile ($(objpfx)sort-test.out): Use $(evaluate-test).
($(objpfx)tst-fmon.out): Likewise.
($(objpfx)tst-numeric.out): Likewise.
($(objpfx)tst-locale.out): Likewise.
($(objpfx)tst-rpmatch.out): Likewise.
($(objpfx)tst-trans.out): Likewise.
($(objpfx)tst-mbswcs.out): Likewise.
($(objpfx)tst-ctype.out): Likewise.
($(objpfx)tst-wctype.out): Likewise.
($(objpfx)tst-langinfo.out): Likewise.
($(objpfx)mtrace-tst-leaks): Likewise.
nptl:
* Makefile ($(objpfx)tst-stack3-mem): Use $(evaluate-test).
($(objpfx)tst-tls6.out): Likewise.
($(objpfx)tst-cleanup0.out): Likewise.
($(objpfx)tst-cleanup0-cmp.out): Likewise.
($(objpfx)tst-cancel-wrappers.out): Likewise.
($(objpfx)tst-oddstacklimit.out): Likewise.
nptl_db:
* Makefile ($(objpfx)db-symbols.out): Use
$(evaluate-test).
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This patch splits makefile rules that generate a file then run cmp to
check the contents of that file into separate rules to generate and
compare the file. This simplifies making those tests generate PASS /
FAIL results, by removing the need to insert && between commands in
the test so that a $(evaluate-test) call is reached. It also avoids
the oddity of the .out file being an intermediate file rather than the
final result generated, as noted for some of these tests in
<https://sourceware.org/ml/libc-alpha/2012-10/msg00894.html>.
In many cases, the rule to run the program was no longer needed
because the default rules for running test programs on the host to
generate a .out file sufficed. (I'm not asserting the commands run
after this patch are *exactly* the same as before, simply that the
rules did nothing special that appeared deliberate or relevant to
anything about what the tests were testing. In cases where the rules
redirected stderr as well as stdout, I left the existing rule's
redirection in place to avoid changing what gets compared with the
expected results.)
It's clear there is a lot in common between the various -cmp.out rules
and it might be possible in future to refactor them into more generic
support for the case of comparing test output against a baseline.
(Some baselines are *.exp, some *.expect, some directly embedded in
the makefiles, and nptl/tst-cleanupx0.expect appears unused.)
Tested x86_64.
* elf/Makefile ($(objpfx)order.out): Remove rule.
[$(run-built-tests) = yes] (tests): Depend on
$(objpfx)order-cmp.out.
($(objpfx)order-cmp.out): New rule.
[$(run-built-tests) = yes] (tests): Depend on
$(objpfx)tst-array1-cmp.out, $(objpfx)tst-array1-static-cmp.out,
$(objpfx)tst-array2-cmp.out, $(objpfx)tst-array3-cmp.out,
$(objpfx)tst-array4-cmp.out, $(objpfx)tst-array5-cmp.out and
$(objpfx)tst-array5-static-cmp.out.
($(objpfx)tst-array1.out): Remove rule.
($(objpfx)tst-array1-cmp.out): New rule.
($(objpfx)tst-array1-static.out): Remove rule.
($(objpfx)tst-array1-static-cmp.out): New rule.
($(objpfx)tst-array2.out): Remove rule.
($(objpfx)tst-array2-cmp.out): New rule.
($(objpfx)tst-array3.out): Remove rule.
($(objpfx)tst-array3-cmp.out): New rule.
($(objpfx)tst-array4.out): Remove rule.
($(objpfx)tst-array4-cmp.out): New rule.
($(objpfx)tst-array5.out): Remove rule.
($(objpfx)tst-array5-cmp.out): New rule.
($(objpfx)tst-array5-static.out): Remove rule.
($(objpfx)tst-array5-static-cmp.out): New rule.
[$(run-built-tests) = yes] (tests): Depend on
$(objpfx)order2-cmp.out.
($(objpfx)order2.out): Remove rule.
($(objpfx)order2-cmp.out): New rule.
($(objpfx)tst-initorder.out): Remove rule.
[$(run-built-tests) = yes] (tests): Depend on
$(objpfx)tst-initorder-cmp.out.
($(objpfx)tst-initorder-cmp.out): New rule.
($(objpfx)tst-initorder2.out): Remove rule.
[$(run-built-tests) = yes] (tests): Depend on
$(objpfx)tst-initorder2-cmp.out.
($(objpfx)tst-initorder2-cmp.out): New rule.
[$(run-built-tests) = yes] (tests): Depend on
$(objpfx)tst-unused-dep-cmp.out.
($(objpfx)tst-unused-dep-cmp.out): Do not run cmp.
($(objpfx)tst-unused-dep-cmp.out): New rule.
* stdio-common/Makefile [$(run-built-tests) = yes] (tests): Depend
on $(objpfx)tst-setvbuf1-cmp.out.
($(objpfx)tst-setvbuf1.out): Do not run cmp.
($(objpfx)tst-setvbuf1-cmp.out): New rule.
* string/Makefile [$(run-built-tests) = yes] (tests): Depend
$(objpfx)tst-svc-cmp.out instead of $(objpfx)tst-svc.out.
($(objpfx)tst-svc.out): Remove rule.
($(objpfx)tst-svc-cmp.out): New rule.
nptl:
* Makefile ($(objpfx)tst-cleanup0.out): Do not run cmp.
[$(run-built-tests) = yes] (tests): Depend on
$(objpfx)tst-cleanup0-cmp.out.
($(objpfx)tst-cleanup0-cmp.out): New rule.
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A ramfs mount supports the same requirements as a tmpfs, so accept that
as a magic type too.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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This reverts commit 7f507ee17aee720fa423fa38502bc3caa0dd03d7.
Conflicts:
ChangeLog
nptl/tst-tls7.c
nptl/tst-tls7mod.c
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Support for /proc/self/task/$tid/comm as added in Linux 2.6.33,
therefore since the test tst-setgetname relies on this functionality
to operate we must skip the test in kernels < 2.6.33. We wrap the
checks with __ASSUME_PROC_PID_TASK_COMM such that in the future when
we move arch_minimum_kernel to 2.6.33 we can remove this code.
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TLS in a dlopened object works fine when accessed from a signal
handler. The default kernel scheduling parameters prevents the
testcase to finish within the 4 seconds.
Tested the bigger timeout on s390 and s390x.
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Since asynchronous cancellation was removed from system by
commit c4dd57c300aa05ab2f957d571c321237a58d0368
Author: Ondřej Bílka <neleai@seznam.cz>
Date: Tue Jan 14 16:07:50 2014 +0100
Do not enable asynchronous cancellation in system. Fixes bug 14782.
We needlessly enabled thread cancellation before it was necessary.
As
only call that needs to be guarded is waitpid which is cancellation
point we could remove cancellation altogether.
we shouldn't check asynchronous cancellation on system.
[BZ #14782]
* tst-cancel-wrappers.sh: Remove system.
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ChangeLog:
2014-01-03 Andrew Hunter <ahh@google.com>
* elf/dl-open.c (): New comment.
* elf/dl-reloc.c (_dl_try_allocate_static_tls): Use
atomic_compare_and_exchange_bool_acq
(_dl_allocate_static_tls): Block signals.
* elf/dl-tls.c (allocate_and_init): Return void.
(_dl_update_slotinfo): Block signals, use atomic update.
nptl/ChangeLog:
2014-01-03 Andrew Hunter <ahh@google.com>
* nptl/Makefile (tst-tls7): New test.
* nptl/tst-tls7.c: New file.
* nptl/tst-tls7mod.c: New file.
* nptl/allocatestack.c (init_one_static_tls): Use atomic barrier.
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This commit adds a testcase for pthread_setname_np
and pthread_getname_np. The testcase itself has
four tests to validate that these functions work
as expected. The test is only enabled for Linux
since it requires access to an alternate method
for validating the functions work.
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This updates glibc for the changes in the ELFv2 relating to the
stack frame layout. These are described in more detail here:
http://gcc.gnu.org/ml/gcc-patches/2013-11/msg01149.html
http://gcc.gnu.org/ml/gcc-patches/2013-11/msg01146.html
Specifically, the "compiler and linker doublewords" were removed,
which has the effect that the save slot for the TOC register is
now at offset 24 rather than 40 to the stack pointer.
In addition, a function may now no longer necessarily assume that
its caller has set up a 64-byte register save area its use.
To address the first change, the patch goes through all assembler
files and replaces immediate offsets in instructions accessing the
ABI-defined stack slots by symbolic offsets. Those already were
defined in ucontext_i.sym and used in some of the context routines,
but that doesn't really seem like the right place for those defines.
The patch instead defines those symbolic offsets in sysdeps.h,
in two variants for the old and new ABI, and uses them systematically
in all assembler files, not just the context routines.
The second change only affected a few assembler files that used
the save area to temporarily store some registers. In those
cases where this happens within a leaf function, this patch
changes the code to store those registers to the "red zone"
below the stack pointer. Otherwise, the functions already allocate
a stack frame, and the patch changes them to add extra space in
these frames as temporary space for the ELFv2 ABI.
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2013-11-25 Paul Pluzhnikov <ppluzhnikov@google.com>
[BZ #11214]
* Makefile (tst-getpid2-ENV): New variable.
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gcc (GCC) 4.9.0 20131114 (experimental)
2013-11-20 Paul Pluzhnikov <ppluzhnikov@google.com
* Makefile (tst-cleanup2, tst-cleanupx2): Add -fno-builtin
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Autoconf has been deprecating configure.in for quite a long time.
Rename all our configure.in and preconfigure.in files to .ac.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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Fixes BZ #15988.
The check had a typo - it checked for PTHREAD_MUTEX_ROBUST_NP instead
of PTHREAD_MUTEX_ROBUST_NORMAL_NP. It has now been replaced by the
already existing convenience macro USE_REQUEUE_PI.
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Resolves #15921
The test case nptl/tst-cleanup2 fails on s390x and power6 due to
instruction sheduling in gcc. This was reported in gcc:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58034
but it was concluded that gcc is allowed to assume that the first
argument to sprintf is a character array - NULL not being a valid
character array.
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* tst-cancel4.c (WRITE_BUFFER_SIZE): Adjust comment.
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* tst-cancel4.c (WRITE_BUFFER_SIZE): Increase to 16384.
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Signed-off-by: Carlos O'Donell <carlos@redhat.com>
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Signed-off-by: Carlos O'Donell <carlos@redhat.com>
---
nptl/
2013-07-19 Dominik Vogt <vogt@de.ibm.com>
* sysdeps/unix/sysv/linux/x86/elision-conf.c:
Remove __rwlock_rtm_enabled and __rwlock_rtm_read_retries.
(elision_init): Don't set __rwlock_rtm_enabled.
* sysdeps/unix/sysv/linux/x86/elision-conf.h:
Remove __rwlock_rtm_enabled.
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Can be enabled with --enable-lock-elision=yes at configure time.
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PTHREAD_MUTEX_NORMAL requires deadlock for nesting, DEFAULT
does not. Since glibc uses the same value (0) disable elision
for any call to pthread_mutexattr_settype() with a 0 value.
This implies that a program can disable elision by doing
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_NORMAL)
Based on a original proposal by Rich Felker.
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Add elision paths to the basic mutex locks.
The normal path has a check for RTM and upgrades the lock
to RTM when available. Trylocks cannot automatically upgrade,
so they check for elision every time.
We use a 4 byte value in the mutex to store the lock
elision adaptation state. This is separate from the adaptive
spin state and uses a separate field.
Condition variables currently do not support elision.
Recursive mutexes and condition variables may be supported at some point,
but are not in the current implementation. Also "trylock" will
not automatically enable elision unless some other lock call
has been already called on the lock.
This version does not use IFUNC, so it means every lock has one
additional check for elision. Benchmarking showed the overhead
to be negligible.
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tst-mutex5 and 8 test some behaviour not required by POSIX,
that elision changes. This changes these tests to not check
this when elision is enabled at configure time.
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Add Enable/disable flags used internally
Extend the mutex initializers to have the fields needed for
elision. The layout stays the same, and this is not visible
to programs.
These changes are not exposed outside pthread
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Lock elision using TSX is a technique to optimize lock scaling
It allows to run locks in parallel using hardware support for
a transactional execution mode in 4th generation Intel Core CPUs.
See http://www.intel.com/software/tsx for more Information.
This patch implements a simple adaptive lock elision algorithm based
on RTM. It enables elision for the pthread mutexes and rwlocks.
The algorithm keeps track whether a mutex successfully elides or not,
and stops eliding for some time when it is not.
When the CPU supports RTM the elision path is automatically tried,
otherwise any elision is disabled.
The adaptation algorithm and its tuning is currently preliminary.
The code adds some checks to the lock fast paths. Micro-benchmarks
show little to no difference without RTM.
This patch implements the low level "lll_" code for lock elision.
Followon patches hook this into the pthread implementation
Changes with the RTM mutexes:
-----------------------------
Lock elision in pthreads is generally compatible with existing programs.
There are some obscure exceptions, which are expected to be uncommon.
See the manual for more details.
- A broken program that unlocks a free lock will crash.
There are ways around this with some tradeoffs (more code in hot paths)
I'm still undecided on what approach to take here; have to wait for testing reports.
- pthread_mutex_destroy of a lock mutex will not return EBUSY but 0.
- There's also a similar situation with trylock outside the mutex,
"knowing" that the mutex must be held due to some other condition.
In this case an assert failure cannot be recovered. This situation is
usually an existing bug in the program.
- Same applies to the rwlocks. Some of the return values changes
(for example there is no EDEADLK for an elided lock, unless it aborts.
However when elided it will also never deadlock of course)
- Timing changes, so broken programs that make assumptions about specific timing
may expose already existing latent problems. Note that these broken programs will
break in other situations too (loaded system, new faster hardware, compiler
optimizations etc.)
- Programs with non recursive mutexes that take them recursively in a thread and
which would always deadlock without elision may not always see a deadlock.
The deadlock will only happen on an early or delayed abort (which typically
happens at some point)
This only happens for mutexes not explicitely set to PTHREAD_MUTEX_NORMAL
or PTHREAD_MUTEX_ADAPTIVE_NP. PTHREAD_MUTEX_NORMAL mutexes do not elide.
The elision default can be set at configure time.
This patch implements the basic infrastructure for elision.
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Static applications that call pthread_exit on the main
thread segfault. This is because after a thread terminates
__libc_start_main decrements __nptl_nthreads which is only
defined in pthread_create. Therefore the right solution is
to add a requirement to pthread_create from pthread_exit.
~~~
nptl/
2013-06-24 Vladimir Nikulichev <v.nikulichev@gmail.com>
[BZ #12310]
* pthread_exit.c: Add reference to pthread_create.
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This patch introduces two new convenience functions to set the default
thread attributes used for creating threads. This allows a programmer
to set the default thread attributes just once in a process and then
run pthread_create without additional attributes.
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Resolves BZ #15618.
pthread_attr_getaffinity_np may write beyond bounds of the input
cpuset buffer if the size of the input buffer is smaller than the
buffer present in the input pthread attributes. Fix is to copy to the
extent of the minimum of the source and the destination.
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It is very very possible that the futex syscall returns an
error and that the caller of lll_futex_wake may want to
look at that error and propagate the failure.
This patch allows a caller to see the syscall error.
There are no users of the syscall error at present, but
future cleanups are now be able to check for the error.
--
nplt/
2013-06-10 Carlos O'Donell <carlos@redhat.com>
* sysdeps/unix/sysv/linux/i386/lowlevellock.h
(lll_futex_wake): Return syscall error.
* sysdeps/unix/sysv/linux/x86_64/lowlevellock.h
(lll_futex_wake): Return syscall error.
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