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16 Commits

Author SHA1 Message Date
Florian Weimer
5a664d7ae8 nptl: Move elision implementations into libc 
The elision interfaces are closely aligned between the targets that
implement them, so declare them in the generic <lowlevellock.h>
file.

Empty .c stubs are provided, so that fewer makefile updates
under sysdeps are needed.  Also simplify initialization via
__libc_early_init.

The symbols __lll_clocklock_elision, __lll_lock_elision,
__lll_trylock_elision, __lll_unlock_elision, __pthread_force_elision
move into libc.  For the time being, non-hidden references are used
from libpthread to access them, but once that part of libpthread
is moved into libc, hidden symbols will be used again.  (Hidden
references seem desirable to reduce the likelihood of transactions
aborts.)
 2021-02-23 14:59:34 +01:00
Florian Weimer
2f4019de81 nptl: Move lowlevellock into libc [BZ #15648] 
And export __lll_lock_wait and __lll_lock_wait_private as
GLIBC_PRIVATE.  This should eliminate the need for the previous
riscv kludge.
 2021-02-22 18:30:52 +01:00
Paul Eggert
2b778ceb40 Update copyright dates with scripts/update-copyrights 
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master
 2021-01-02 12:17:34 -08:00
Adhemerval Zanella
878fe624d4 nptl: Replace lll_futex_{timed_}wait by futex-internal.h 
The idea is to make NPTL implementation to use on the functions
provided by futex-internal.h.

Checked on x86_64-linux-gnu and i686-linux-gnu.

Reviewed-by: Lukasz Majewski <lukma@denx.de>
 2020-11-25 10:43:18 -03:00
Joseph Myers
d614a75396 Update copyright dates with scripts/update-copyrights. 2020-01-01 00:14:33 +00:00
Paul Eggert
5a82c74822 Prefer https to http for gnu.org and fsf.org URLs 
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:

sed -ri '
  s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
  s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
  $(find $(git ls-files) -prune -type f \
      ! -name '*.po' \
      ! -name 'ChangeLog*' \
      ! -path COPYING ! -path COPYING.LIB \
      ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
      ! -path manual/texinfo.tex ! -path scripts/config.guess \
      ! -path scripts/config.sub ! -path scripts/install-sh \
      ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
      ! -path INSTALL ! -path  locale/programs/charmap-kw.h \
      ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
      ! '(' -name configure \
            -execdir test -f configure.ac -o -f configure.in ';' ')' \
      ! '(' -name preconfigure \
            -execdir test -f preconfigure.ac ';' ')' \
      -print)

and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:

  chmod a+x sysdeps/unix/sysv/linux/riscv/configure
  # Omit irrelevant whitespace and comment-only changes,
  # perhaps from a slightly-different Autoconf version.
  git checkout -f \
    sysdeps/csky/configure \
    sysdeps/hppa/configure \
    sysdeps/riscv/configure \
    sysdeps/unix/sysv/linux/csky/configure
  # Omit changes that caused a pre-commit check to fail like this:
  # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
  git checkout -f \
    sysdeps/powerpc/powerpc64/ppc-mcount.S \
    sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
  # Omit change that caused a pre-commit check to fail like this:
  # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
  git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
 2019-09-07 02:43:31 -07:00
Adhemerval Zanella
d7e4c642ef Small optimization for lowlevellock 
This patch optimizes both __lll_lock_wait_private and __lll_lock_wait
by issuing only one lll_futex_wait.  Since it is defined as an inlined
syscall and inlined syscalls are defined using inlined assembly the
compiler usually can not see both calls are equal and optimize
accordingly.

On aarch64 the resulting binary is change from:

0000000000000060 <__lll_lock_wait>:
  60:   2a0103e5        mov     w5, w1
  64:   b9400001        ldr     w1, [x0]
  68:   aa0003e4        mov     x4, x0
  6c:   7100083f        cmp     w1, #0x2
  70:   540000e1        b.ne    8c <__lll_lock_wait+0x2c>  // b.any
  74:   521900a1        eor     w1, w5, #0x80
  78:   d2800042        mov     x2, #0x2                        // #2
  7c:   93407c21        sxtw    x1, w1
  80:   d2800003        mov     x3, #0x0                        // #0
  84:   d2800c48        mov     x8, #0x62                       // #98
  88:   d4000001        svc     #0x0
  8c:   521900a5        eor     w5, w5, #0x80
  90:   52800046        mov     w6, #0x2                        // #2
  94:   93407ca5        sxtw    x5, w5
  98:   14000008        b       b8 <__lll_lock_wait+0x58>
  9c:   d503201f        nop
  a0:   aa0403e0        mov     x0, x4
  a4:   aa0503e1        mov     x1, x5
  a8:   d2800042        mov     x2, #0x2                        // #2
  ac:   d2800003        mov     x3, #0x0                        // #0
  b0:   d2800c48        mov     x8, #0x62                       // #98
  b4:   d4000001        svc     #0x0
  b8:   885ffc80        ldaxr   w0, [x4]
  bc:   88017c86        stxr    w1, w6, [x4]
  c0:   35ffffc1        cbnz    w1, b8 <__lll_lock_wait+0x58>
  c4:   35fffee0        cbnz    w0, a0 <__lll_lock_wait+0x40>
  c8:   d65f03c0        ret

To:

0000000000000048 <__lll_lock_wait>:
  48:   aa0003e4        mov     x4, x0
  4c:   2a0103e5        mov     w5, w1
  50:   b9400000        ldr     w0, [x0]
  54:   7100081f        cmp     w0, #0x2
  58:   540000c0        b.eq    70 <__lll_lock_wait+0x28>  // b.none
  5c:   52800041        mov     w1, #0x2                        // #2
  60:   885ffc80        ldaxr   w0, [x4]
  64:   88027c81        stxr    w2, w1, [x4]
  68:   35ffffc2        cbnz    w2, 60 <__lll_lock_wait+0x18>
  6c:   34000120        cbz     w0, 90 <__lll_lock_wait+0x48>
  70:   521900a1        eor     w1, w5, #0x80
  74:   aa0403e0        mov     x0, x4
  78:   93407c21        sxtw    x1, w1
  7c:   d2800042        mov     x2, #0x2                        // #2
  80:   d2800003        mov     x3, #0x0                        // #0
  84:   d2800c48        mov     x8, #0x62                       // #98
  88:   d4000001        svc     #0x0
  8c:   17fffff4        b       5c <__lll_lock_wait+0x14>
  90:   d65f03c0        ret

I see similar changes on powerpc and other architectures.  It also aligns
with x86_64 implementation by adding the systemtap probes.

Checker on aarch64-linux-gnu.

	* nptl/lowlevellock.c (__lll_lock_wait, __lll_lock_wait_private):
	Optimize futex call and add systemtap probe.
 2019-05-14 08:41:52 -03:00
Joseph Myers
04277e02d7 Update copyright dates with scripts/update-copyrights. 
* All files with FSF copyright notices: Update copyright dates
	using scripts/update-copyrights.
	* locale/programs/charmap-kw.h: Regenerated.
	* locale/programs/locfile-kw.h: Likewise.
 2019-01-01 00:11:28 +00:00
Joseph Myers
688903eb3e Update copyright dates with scripts/update-copyrights. 
* All files with FSF copyright notices: Update copyright dates
	using scripts/update-copyrights.
	* locale/programs/charmap-kw.h: Regenerated.
	* locale/programs/locfile-kw.h: Likewise.
 2018-01-01 00:32:25 +00:00
Joseph Myers
bfff8b1bec Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
Joseph Myers
f7a9f785e5 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
Roland McGrath
68c97aef62 Split timed-wait functions out of nptl/lowlevellock.c. 2015-05-26 14:49:13 -07:00
Joseph Myers
b168057aaa Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
Torvald Riegel
d52c62df3d Add comments for the generic lowlevellock implementation. 
Patch by Bernard Ogden <bernie.ogden@linaro.org>.
 2014-12-15 22:49:29 +01:00
Siddhesh Poyarekar
ce9f10f7f0 Remove IS_IN_libpthread 
Replace with IS_IN (libpthread).  Generated code unchanged on
x86_64.

	* nptl/lowlevellock.c: Use IS_IN instead of IS_IN_libpthread.
	* nptl/pthreadP.h: Likewise.
	* nptl_db/structs.def: Likewise.
	* sysdeps/arm/sysdep.h: Likewise.
	* sysdeps/nptl/bits/libc-lock.h: Likewise.
	* sysdeps/nptl/bits/libc-lockP.h: Likewise.
	* sysdeps/sparc/sparc32/lowlevellock.c: Likewise.
	* sysdeps/unix/alpha/sysdep.h: Likewise.
	* sysdeps/unix/sysv/linux/aarch64/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/aarch64/sysdep.h: Likewise.
	* sysdeps/unix/sysv/linux/alpha/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/arm/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/hppa/nptl/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/i386/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/i386/sysdep.h: Likewise.
	* sysdeps/unix/sysv/linux/ia64/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/ia64/sysdep.h: Likewise.
	* sysdeps/unix/sysv/linux/m68k/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/not-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/sh/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/tile/sysdep-cancel.h: Likewise.
	* sysdeps/unix/sysv/linux/tile/sysdep.h: Likewise.
	* sysdeps/unix/sysv/linux/tile/waitpid.S: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/cancellation.S: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/sysdep-cancel.h: Likewise.
 2014-11-24 11:41:46 +05:30
Roland McGrath
08192659bb Get rid of nptl/sysdeps/ entirely! 2014-07-07 09:28:38 -07:00