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Re: [PATCH] nptl: Add pthread_thread_number_np function


On Thu, Dec 14, 2017 at 10:56 AM, Florian Weimer <fweimer@redhat.com> wrote:
> The implementation is actually in libc.so.  With a full implementation
> of pthread_self in libc.so, pthread_thread_number_np is completely
> usable without libpthread.
>
> 2017-12-14  Florian Weimer  <fweimer@redhat.com>
>
>         nptl: Add pthread_thread_number_np function.
>         * csu/libc-tls.c (__libc_setup_tls): Call __dl_inittcb.
>         * elf/Makefile (dl-routines): Add dl-inittcb.
>         * elf/dl-inittcb.c: New file.
>         * elf/rtld.c (init_tls): Call __dl_inittcb.
>         * manual/threads.texi (Non-POSIX Extensions): Reference Non-POSIX
>         Extensions.
>         (Non-POSIX Extensions): New node.
>         * nptl/Makefile (routines): Add thread_number.
>         (tests): Add tst-thread_number-single, tst-thread_number-multi,
>         tst-thread_number-single-static, tst-thread_number-multi-static.
>         (tests-nolibpthread): Add tst-thread_number-single,
>         tst-thread_number-single-static.
>         (tests-static): Add tst-thread_number-single-static,
>         tst-thread_number-multi-static.
>         * nptl/Versions (GLIBC_2.27): Export pthread_thread_number_np.
>         * nptl/allocatestack.c (allocate_stack): Increment
>         global_thread_number under__default_pthread_attr_lock and use its
>         value to set the new thread number.
>         * nptl/descr.h (struct pthread): Add number member.
>         * nptl/thread_number.c: New file.
>         * nptl/tst-thread_number-multi.c: Likewise.
>         * nptl/tst-thread_number-single.c: Likewise.
>         * nptl/tst-thread_number-multi-static.c: Likewise.
>         * nptl/tst-thread_number-single-static.c: Likewise.
>         * sysdeps/nptl/pthread.h (pthread_thread_number_np): Declare.
>         * sysdeps/unix/sysv/linux/libc**.abilist: Update.
>
> diff --git a/csu/libc-tls.c b/csu/libc-tls.c
> index 00138eb43a..af81cba12c 100644
> --- a/csu/libc-tls.c
> +++ b/csu/libc-tls.c
> @@ -195,6 +195,7 @@ __libc_setup_tls (void)
>  #endif
>    if (__builtin_expect (lossage != NULL, 0))
>      _startup_fatal (lossage);
> +  __dl_inittcb ();
>
>    /* Update the executable's link map with enough information to make
>       the TLS routines happy.  */
> diff --git a/elf/Makefile b/elf/Makefile
> index 8563555079..66ce2953a4 100644
> --- a/elf/Makefile
> +++ b/elf/Makefile
> @@ -30,7 +30,7 @@ routines      = $(all-dl-routines) dl-support dl-iteratephdr \
>  # profiled libraries.
>  dl-routines    = $(addprefix dl-,load lookup object reloc deps hwcaps \
>                                   runtime init fini debug misc \
> -                                 version profile tls origin scope \
> +                                 version profile tls inittcb origin scope \
>                                   execstack caller open close trampoline \
>                                   exception sort-maps)
>  ifeq (yes,$(use-ldconfig))
> diff --git a/elf/dl-inittcb.c b/elf/dl-inittcb.c
> new file mode 100644
> index 0000000000..5a70e9775d
> --- /dev/null
> +++ b/elf/dl-inittcb.c
> @@ -0,0 +1,22 @@
> +/* Initialize TCB contents.  Generic version.
> +   Copyright (C) 2017 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +
> +void
> +__dl_inittcb (void)
> +{
> +}
> diff --git a/elf/rtld.c b/elf/rtld.c
> index cfd3729b8e..214e2312fa 100644
> --- a/elf/rtld.c
> +++ b/elf/rtld.c
> @@ -740,6 +740,7 @@ cannot allocate TLS data structures for initial thread\n");
>    const char *lossage = TLS_INIT_TP (tcbp);
>    if (__glibc_unlikely (lossage != NULL))
>      _dl_fatal_printf ("cannot set up thread-local storage: %s\n", lossage);
> +  __dl_inittcb ();
>    tls_init_tp_called = true;
>
>    return tcbp;
> diff --git a/manual/threads.texi b/manual/threads.texi
> index 769d974d50..6c62ff3da0 100644
> --- a/manual/threads.texi
> +++ b/manual/threads.texi
> @@ -80,6 +80,7 @@ the standard.
>  @menu
>  * Default Thread Attributes::             Setting default attributes for
>                                           threads in a process.
> +* Identifying Threads::                   Unique identifiers for threads.
>  @end menu
>
>  @node Default Thread Attributes
> @@ -124,6 +125,29 @@ The system does not have sufficient memory.
>  @end table
>  @end deftypefun
>
> +@node Identifying Threads
> +@subsection Unique identifiers for threads
> +
> +@Theglibc{} provides a non-standard function to obtain a unique thread
> +identifier.
> +
> +@deftypefun uint64_t pthread_thread_number_np (pthread_t @var{thread})
> +@standards{GNU, pthread.h}
> +@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
> +
> +This function returns a number that uniquely identifies @var{thread}
> +among all past, current, and future running threads.  This number does
> +not change during the life-time of the thread.  Once returned by this
> +function, a number will not be reused after the thread terminates.
> +
> +The returned number is only unique with regards to the current process.
> +It may be shared by subprocesses and other processes in the system.
> +
> +The initial (main) thread has number 1.  Thread numbers are not
> +necessarily assigned in a consecutive fashion.  They bear no
> +relationship to process IDs or thread IDs assigned by the kernel.
> +@end deftypefun
> +
>  @c FIXME these are undocumented:
>  @c pthread_atfork
>  @c pthread_attr_destroy
> diff --git a/nptl/Makefile b/nptl/Makefile
> index ae388d1112..087fb6a8b5 100644
> --- a/nptl/Makefile
> +++ b/nptl/Makefile
> @@ -30,7 +30,7 @@ install-lib-ldscripts := libpthread.so
>
>  routines = alloca_cutoff forward libc-lowlevellock libc-cancellation \
>            libc-cleanup libc_pthread_init libc_multiple_threads \
> -          register-atfork unregister-atfork pthread_self
> +          register-atfork unregister-atfork pthread_self thread_number
>  shared-only-routines = forward
>
>  # We need to provide certain routines for compatibility with existing
> @@ -302,7 +302,8 @@ tests = tst-attr1 tst-attr2 tst-attr3 tst-default-attr \
>                             c89 gnu89 c99 gnu99 c11 gnu11) \
>         tst-bad-schedattr \
>         tst-thread_local1 tst-mutex-errorcheck tst-robust10 \
> -       tst-robust-fork tst-create-detached tst-memstream
> +       tst-robust-fork tst-create-detached tst-memstream \
> +       tst-thread_number-single tst-thread_number-multi \
>
>  tests-internal := tst-rwlock19 tst-rwlock20 \
>                   tst-sem11 tst-sem12 tst-sem13 \
> @@ -318,7 +319,9 @@ test-srcs = tst-oddstacklimit
>  test-xfail-tst-once5 = yes
>
>  # Files which must not be linked with libpthread.
> -tests-nolibpthread = tst-unload
> +tests-nolibpthread = tst-unload \
> +  tst-thread_number-single \
> +  tst-thread_number-single-static \
>
>  gen-as-const-headers = pthread-errnos.sym \
>                        unwindbuf.sym \
> @@ -433,9 +436,13 @@ link-libc-static := $(common-objpfx)libc.a $(static-gnulib) \
>  tests-static += tst-locale1 tst-locale2 tst-stackguard1-static \
>                 tst-cancel21-static tst-cancel24-static tst-cond8-static \
>                 tst-mutex8-static tst-mutexpi8-static tst-sem11-static \
> -               tst-sem12-static
> +               tst-sem12-static tst-thread_number-single-static \
> +               tst-thread_number-multi-static \
> +
>  tests += tst-cancel21-static tst-cancel24-static \
> -        tst-cond8-static
> +  tst-cond8-static tst-thread_number-single-static \
> +  tst-thread_number-multi-static \
> +
>  tests-internal += tst-sem11-static tst-sem12-static tst-stackguard1-static
>  xtests-static += tst-setuid1-static
>
> diff --git a/nptl/Versions b/nptl/Versions
> index 0ae5def464..8b6c839408 100644
> --- a/nptl/Versions
> +++ b/nptl/Versions
> @@ -28,6 +28,9 @@ libc {
>      pthread_cond_wait; pthread_cond_signal;
>      pthread_cond_broadcast; pthread_cond_timedwait;
>    }
> +  GLBIC_2.27 {
> +    pthread_thread_number_np;
> +  }
>    GLIBC_PRIVATE {
>      __libc_alloca_cutoff;
>      # Internal libc interface to libpthread
> diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c
> index 1cc7893195..0e1cf3939e 100644
> --- a/nptl/allocatestack.c
> +++ b/nptl/allocatestack.c
> @@ -413,16 +413,21 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
>    assert (powerof2 (pagesize_m1 + 1));
>    assert (TCB_ALIGNMENT >= STACK_ALIGN);
>
> -  /* Get the stack size from the attribute if it is set.  Otherwise we
> -     use the default we determined at start time.  */
> -  if (attr->stacksize != 0)
> -    size = attr->stacksize;
> -  else
> -    {
> -      lll_lock (__default_pthread_attr_lock, LLL_PRIVATE);
> +  uint64_t thread_number;
> +  lll_lock (__default_pthread_attr_lock, LLL_PRIVATE);
> +  {
> +    /* Number 1 is reserved for the initial thread.  */
> +    static uint64_t global_thread_number = 1;
> +    thread_number = ++global_thread_number;
> +
> +    /* Get the stack size from the attribute if it is set.  Otherwise
> +       we use the default we determined at start time.  */
> +    if (attr->stacksize != 0)
> +      size = attr->stacksize;
> +    else
>        size = __default_pthread_attr.stacksize;
> -      lll_unlock (__default_pthread_attr_lock, LLL_PRIVATE);
> -    }
> +  }
> +  lll_unlock (__default_pthread_attr_lock, LLL_PRIVATE);


Why can't you just make global_thread_number  do an atomic addition
instead of the lock here?   It will be slightly faster.  But I notice
you don't handle the case where you create and destroy over 2^64-1
threads (that is an overflow of global_thread_number).  You don't even
mention this limitation any where.  I can think of (maybe bad)
examples where this could be the case.  Treating threads as cheap as
run pools.  Yes it is not a good idea to do that but people can do it.

Thanks,
Andrew

>
>    /* Get memory for the stack.  */
>    if (__glibc_unlikely (attr->flags & ATTR_FLAG_STACKADDR))
> @@ -758,6 +763,8 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
>  #endif
>    pd->robust_head.list = &pd->robust_head;
>
> +  pd->number = thread_number;
> +
>    /* We place the thread descriptor at the end of the stack.  */
>    *pdp = pd;
>
> diff --git a/nptl/descr.h b/nptl/descr.h
> index c83b17b674..49e266139e 100644
> --- a/nptl/descr.h
> +++ b/nptl/descr.h
> @@ -395,6 +395,9 @@ struct pthread
>    /* Resolver state.  */
>    struct __res_state res;
>
> +  /* Unique number assigned to this thread.  */
> +  uint64_t number;
> +
>    /* This member must be last.  */
>    char end_padding[];
>
> diff --git a/nptl/thread_number.c b/nptl/thread_number.c
> new file mode 100644
> index 0000000000..a9fdaa508b
> --- /dev/null
> +++ b/nptl/thread_number.c
> @@ -0,0 +1,26 @@
> +/* Unique numbers for threads.
> +   Copyright (C) 2017 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +
> +#include "pthreadP.h"
> +
> +__uint64_t
> +pthread_thread_number_np (pthread_t threadid)
> +{
> +  struct pthread *pd = (struct pthread *) threadid;
> +  return pd->number;
> +}
> diff --git a/nptl/tst-thread_number-multi-static.c b/nptl/tst-thread_number-multi-static.c
> new file mode 100644
> index 0000000000..658928cfd5
> --- /dev/null
> +++ b/nptl/tst-thread_number-multi-static.c
> @@ -0,0 +1,19 @@
> +/* Test unique numbers for threads, static multi-threaded version.
> +   Copyright (C) 2017 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +
> +#include "tst-thread_number-multi.c"
> diff --git a/nptl/tst-thread_number-multi.c b/nptl/tst-thread_number-multi.c
> new file mode 100644
> index 0000000000..e26f19e44a
> --- /dev/null
> +++ b/nptl/tst-thread_number-multi.c
> @@ -0,0 +1,99 @@
> +/* Test unique numbers for threads, non-static multi-threaded version.
> +   Copyright (C) 2017 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +
> +#include <pthread.h>
> +#include <stdbool.h>
> +#include <stdint.h>
> +#include <stdlib.h>
> +#include <support/check.h>
> +#include <support/namespace.h>
> +#include <support/xthread.h>
> +
> +static void
> +subprocess (void *closure)
> +{
> +  TEST_COMPARE (pthread_thread_number_np (pthread_self ()), 1U);
> +}
> +
> +static void *
> +subthread (void *closure)
> +{
> +  if (closure != NULL)
> +    xpthread_barrier_wait (closure);
> +  return NULL;
> +}
> +
> +static int
> +compare (const void *pleft, const void *pright)
> +{
> +  uint64_t left = *(const uint64_t *)pleft;
> +  uint64_t right = *(const uint64_t *)pright;
> +  if (left < right)
> +    return -1;
> +  if (left > right)
> +    return 1;
> +  return 0;
> +}
> +
> +static int
> +do_test (void)
> +{
> +  TEST_COMPARE (pthread_thread_number_np (pthread_self ()), 1U);
> +  support_isolate_in_subprocess (subprocess, NULL);
> +
> +  /* Create thread_count threads, half of which are joined
> +     immediately, have of which stay arround.  */
> +  enum { thread_count = 10 };
> +  pthread_barrier_t barrier;
> +  xpthread_barrier_init (&barrier, NULL, thread_count / 2 + 1);
> +  uint64_t ids[thread_count];
> +  pthread_t threads[thread_count]; /* Only even-numbered entries are valid.  */
> +  for (int i = 0; i < thread_count; ++i)
> +    {
> +      bool stay_around = (i % 2) == 0;
> +      threads[i] = xpthread_create (NULL, subthread,
> +                                    stay_around ? &barrier : NULL);
> +      ids[i] = pthread_thread_number_np (threads[i]);
> +      TEST_VERIFY (ids[i] != 1);
> +      if (!stay_around)
> +        xpthread_join (threads[i]);
> +    }
> +
> +  /* Check that the IDs are all distinct.  */
> +  qsort (ids, thread_count, sizeof (ids[0]), compare);
> +  for (int i = 1; i < thread_count; ++i)
> +    TEST_VERIFY (ids[i - 1] < ids[i]);
> +
> +  /* Main thread ID should remain at 1.  */
> +  TEST_COMPARE (pthread_thread_number_np (pthread_self ()), 1U);
> +  support_isolate_in_subprocess (subprocess, NULL);
> +
> +  /* Clean up.  */
> +  xpthread_barrier_wait (&barrier);
> +  for (int i = 0; i < thread_count; ++i)
> +    if ((i % 2) == 0)
> +      xpthread_join (threads[i]);
> +
> +  /* Main thread ID should still remain at 1.  */
> +  TEST_COMPARE (pthread_thread_number_np (pthread_self ()), 1U);
> +  support_isolate_in_subprocess (subprocess, NULL);
> +
> +  return 0;
> +}
> +
> +#include <support/test-driver.c>
> diff --git a/nptl/tst-thread_number-single-static.c b/nptl/tst-thread_number-single-static.c
> new file mode 100644
> index 0000000000..5c21063c36
> --- /dev/null
> +++ b/nptl/tst-thread_number-single-static.c
> @@ -0,0 +1,19 @@
> +/* Test unique numbers for threads, static single-threaded version.
> +   Copyright (C) 2017 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +
> +#include "tst-thread_number-single.c"
> diff --git a/nptl/tst-thread_number-single.c b/nptl/tst-thread_number-single.c
> new file mode 100644
> index 0000000000..43497205c7
> --- /dev/null
> +++ b/nptl/tst-thread_number-single.c
> @@ -0,0 +1,38 @@
> +/* Test unique numbers for threads, non-static single-threaded version.
> +   Copyright (C) 2017 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +
> +#include <pthread.h>
> +#include <support/check.h>
> +#include <support/namespace.h>
> +
> +static void
> +subprocess (void *closure)
> +{
> +  TEST_COMPARE (pthread_thread_number_np (pthread_self ()), 1U);
> +}
> +
> +static int
> +do_test (void)
> +{
> +  TEST_COMPARE (pthread_thread_number_np (pthread_self ()), 1U);
> +  support_isolate_in_subprocess (subprocess, NULL);
> +
> +  return 0;
> +}
> +
> +#include <support/test-driver.c>
> diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
> index 7a65dc641c..99f2e58875 100644
> --- a/sysdeps/generic/ldsodefs.h
> +++ b/sysdeps/generic/ldsodefs.h
> @@ -1056,6 +1056,10 @@ void __libc_setup_tls (void);
>  void __pthread_initialize_minimal (void) weak_function;
>  #endif
>
> +/* Initialize the already-existing TCB for the main thread.  Called
> +   during dynamic linker startup or from __libc_setup_tls.  */
> +void __dl_inittcb (void) attribute_hidden;
> +
>  /* Allocate memory for static TLS block (unless MEM is nonzero) and dtv.  */
>  extern void *_dl_allocate_tls (void *mem);
>  rtld_hidden_proto (_dl_allocate_tls)
> diff --git a/sysdeps/nptl/dl-inittcb.c b/sysdeps/nptl/dl-inittcb.c
> new file mode 100644
> index 0000000000..c25424dfa6
> --- /dev/null
> +++ b/sysdeps/nptl/dl-inittcb.c
> @@ -0,0 +1,27 @@
> +/* Initialize TCB contents.  NPTL version.
> +   Copyright (C) 2017 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +
> +#include <ldsodefs.h>
> +#include <tls.h>
> +
> +void
> +__dl_inittcb (void)
> +{
> +  /* The main thread has number 1.  */
> +  THREAD_SELF->number = 1;
> +}
> diff --git a/sysdeps/nptl/pthread.h b/sysdeps/nptl/pthread.h
> index 2b2b386ab3..e0714ed951 100644
> --- a/sysdeps/nptl/pthread.h
> +++ b/sysdeps/nptl/pthread.h
> @@ -1148,6 +1148,10 @@ extern int pthread_atfork (void (*__prepare) (void),
>                            void (*__child) (void)) __THROW;
>
>
> +/* Return a number uniquely identifying THREAD, even after its
> +   termination.  */
> +__uint64_t pthread_thread_number_np (pthread_t __thread_id) __THROW;
> +
>  #ifdef __USE_EXTERN_INLINES
>  /* Optimizations.  */
>  __extern_inline int
> diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> index ec0ead15dd..e206f77540 100644
> --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
> @@ -1,3 +1,5 @@
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.17 GLIBC_2.17 A
>  GLIBC_2.17 _Exit F
>  GLIBC_2.17 _IO_2_1_stderr_ D 0xe0
> diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> index 5355769974..92429a8d78 100644
> --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
> @@ -3,6 +3,8 @@ GCC_3.0 _Unwind_Find_FDE F
>  GCC_3.0 __deregister_frame_info_bases F
>  GCC_3.0 __register_frame_info_bases F
>  GCC_3.0 __register_frame_info_table_bases F
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.0 GLIBC_2.0 A
>  GLIBC_2.0 _IO_adjust_column F
>  GLIBC_2.0 _IO_default_doallocate F
> diff --git a/sysdeps/unix/sysv/linux/arm/libc.abilist b/sysdeps/unix/sysv/linux/arm/libc.abilist
> index 9bafe71b51..bcd54ecdf5 100644
> --- a/sysdeps/unix/sysv/linux/arm/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/arm/libc.abilist
> @@ -1,3 +1,5 @@
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.10 GLIBC_2.10 A
>  GLIBC_2.10 __cxa_at_quick_exit F
>  GLIBC_2.10 __posix_getopt F
> diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> index 90aa8d034f..84445a123e 100644
> --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
> @@ -1,3 +1,5 @@
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.10 GLIBC_2.10 A
>  GLIBC_2.10 __cxa_at_quick_exit F
>  GLIBC_2.10 __posix_getopt F
> diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
> index 4d44c30c64..caa8dff010 100644
> --- a/sysdeps/unix/sysv/linux/i386/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
> @@ -3,6 +3,8 @@ GCC_3.0 _Unwind_Find_FDE F
>  GCC_3.0 __deregister_frame_info_bases F
>  GCC_3.0 __register_frame_info_bases F
>  GCC_3.0 __register_frame_info_table_bases F
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.0 GLIBC_2.0 A
>  GLIBC_2.0 _IO_adjust_column F
>  GLIBC_2.0 _IO_default_doallocate F
> diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> index 112fc57634..02301da334 100644
> --- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
> @@ -1,3 +1,5 @@
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.10 GLIBC_2.10 A
>  GLIBC_2.10 __cxa_at_quick_exit F
>  GLIBC_2.10 __posix_getopt F
> diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> index 2e8b6a4586..a3fbcb831f 100644
> --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
> @@ -1,3 +1,5 @@
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.10 GLIBC_2.10 A
>  GLIBC_2.10 __cxa_at_quick_exit F
>  GLIBC_2.10 __posix_getopt F
> diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> index 3c33400f67..203a63aa27 100644
> --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
> @@ -3,6 +3,8 @@ GCC_3.0 _Unwind_Find_FDE F
>  GCC_3.0 __deregister_frame_info_bases F
>  GCC_3.0 __register_frame_info_bases F
>  GCC_3.0 __register_frame_info_table_bases F
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.0 GLIBC_2.0 A
>  GLIBC_2.0 _IO_adjust_column F
>  GLIBC_2.0 _IO_default_doallocate F
> diff --git a/sysdeps/unix/sysv/linux/microblaze/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
> index e1b1a579d2..a3be97ef65 100644
> --- a/sysdeps/unix/sysv/linux/microblaze/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
> @@ -1,3 +1,5 @@
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.18 GLIBC_2.18 A
>  GLIBC_2.18 _Exit F
>  GLIBC_2.18 _IO_2_1_stderr_ D 0x98
> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> index c1550323f3..94de2ef489 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
> @@ -3,6 +3,8 @@ GCC_3.0 _Unwind_Find_FDE F
>  GCC_3.0 __deregister_frame_info_bases F
>  GCC_3.0 __register_frame_info_bases F
>  GCC_3.0 __register_frame_info_table_bases F
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.0 GLIBC_2.0 A
>  GLIBC_2.0 _IO_adjust_column F
>  GLIBC_2.0 _IO_default_doallocate F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> index 3b3a172e4f..878bee4bb5 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
> @@ -3,6 +3,8 @@ GCC_3.0 _Unwind_Find_FDE F
>  GCC_3.0 __deregister_frame_info_bases F
>  GCC_3.0 __register_frame_info_bases F
>  GCC_3.0 __register_frame_info_table_bases F
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.0 GLIBC_2.0 A
>  GLIBC_2.0 _IO_adjust_column F
>  GLIBC_2.0 _IO_default_doallocate F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> index 101ca7a241..94706fccb4 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
> @@ -3,6 +3,8 @@ GCC_3.0 _Unwind_Find_FDE F
>  GCC_3.0 __deregister_frame_info_bases F
>  GCC_3.0 __register_frame_info_bases F
>  GCC_3.0 __register_frame_info_table_bases F
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.0 GLIBC_2.0 A
>  GLIBC_2.0 _IO_adjust_column F
>  GLIBC_2.0 _IO_default_doallocate F
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> index 2d129f7170..adc3de5c88 100644
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
> @@ -3,6 +3,8 @@ GCC_3.0 _Unwind_Find_FDE F
>  GCC_3.0 __deregister_frame_info_bases F
>  GCC_3.0 __register_frame_info_bases F
>  GCC_3.0 __register_frame_info_table_bases F
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.0 GLIBC_2.0 A
>  GLIBC_2.0 _IO_adjust_column F
>  GLIBC_2.0 _IO_default_doallocate F
> diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> index 8bc350aff8..f6198b3dbb 100644
> --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
> @@ -1,3 +1,5 @@
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.21 GLIBC_2.21 A
>  GLIBC_2.21 _Exit F
>  GLIBC_2.21 _IO_2_1_stderr_ D 0x98
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> index 127c426e1c..363a3a2e10 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
> @@ -3,6 +3,8 @@ GCC_3.0 _Unwind_Find_FDE F
>  GCC_3.0 __deregister_frame_info_bases F
>  GCC_3.0 __register_frame_info_bases F
>  GCC_3.0 __register_frame_info_table_bases F
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.0 GLIBC_2.0 A
>  GLIBC_2.0 _IO_adjust_column F
>  GLIBC_2.0 _IO_default_doallocate F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> index a9411318e2..dfa0463282 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
> @@ -3,6 +3,8 @@ GCC_3.0 _Unwind_Find_FDE F
>  GCC_3.0 __deregister_frame_info_bases F
>  GCC_3.0 __register_frame_info_bases F
>  GCC_3.0 __register_frame_info_table_bases F
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.0 GLIBC_2.0 A
>  GLIBC_2.0 _IO_adjust_column F
>  GLIBC_2.0 _IO_default_doallocate F
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
> index d7bf5db601..37a34eb833 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
> @@ -1,3 +1,5 @@
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.17 GLIBC_2.17 A
>  GLIBC_2.17 _Exit F
>  GLIBC_2.17 _IO_2_1_stderr_ D 0xe0
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
> index a3415a72ac..a0dbaf366a 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
> @@ -1,3 +1,5 @@
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.10 GLIBC_2.10 A
>  GLIBC_2.10 __cxa_at_quick_exit F
>  GLIBC_2.10 __posix_getopt F
> diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> index 414338f9a2..a30b304817 100644
> --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
> @@ -3,6 +3,8 @@ GCC_3.0 _Unwind_Find_FDE F
>  GCC_3.0 __deregister_frame_info_bases F
>  GCC_3.0 __register_frame_info_bases F
>  GCC_3.0 __register_frame_info_table_bases F
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.0 GLIBC_2.0 A
>  GLIBC_2.0 _IO_adjust_column F
>  GLIBC_2.0 _IO_default_doallocate F
> diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> index f0f7a69b64..a759aa9cf5 100644
> --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
> @@ -3,6 +3,8 @@ GCC_3.0 _Unwind_Find_FDE F
>  GCC_3.0 __deregister_frame_info_bases F
>  GCC_3.0 __register_frame_info_bases F
>  GCC_3.0 __register_frame_info_table_bases F
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.10 GLIBC_2.10 A
>  GLIBC_2.10 __cxa_at_quick_exit F
>  GLIBC_2.10 __posix_getopt F
> diff --git a/sysdeps/unix/sysv/linux/sh/libc.abilist b/sysdeps/unix/sysv/linux/sh/libc.abilist
> index 9f95aba898..133e0a55ef 100644
> --- a/sysdeps/unix/sysv/linux/sh/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sh/libc.abilist
> @@ -3,6 +3,8 @@ GCC_3.0 _Unwind_Find_FDE F
>  GCC_3.0 __deregister_frame_info_bases F
>  GCC_3.0 __register_frame_info_bases F
>  GCC_3.0 __register_frame_info_table_bases F
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.10 GLIBC_2.10 A
>  GLIBC_2.10 __cxa_at_quick_exit F
>  GLIBC_2.10 __posix_getopt F
> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> index 83fbdf2d7e..e525ed69d6 100644
> --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
> @@ -3,6 +3,8 @@ GCC_3.0 _Unwind_Find_FDE F
>  GCC_3.0 __deregister_frame_info_bases F
>  GCC_3.0 __register_frame_info_bases F
>  GCC_3.0 __register_frame_info_table_bases F
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.0 .div F
>  GLIBC_2.0 .mul F
>  GLIBC_2.0 .rem F
> diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> index ee84ad10bc..d4fb34eceb 100644
> --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
> @@ -3,6 +3,8 @@ GCC_3.0 _Unwind_Find_FDE F
>  GCC_3.0 __deregister_frame_info_bases F
>  GCC_3.0 __register_frame_info_bases F
>  GCC_3.0 __register_frame_info_table_bases F
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.10 GLIBC_2.10 A
>  GLIBC_2.10 __cxa_at_quick_exit F
>  GLIBC_2.10 __posix_getopt F
> diff --git a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
> index dcbfbc05ac..f598149374 100644
> --- a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx32/libc.abilist
> @@ -1,3 +1,5 @@
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.12 GLIBC_2.12 A
>  GLIBC_2.12 _Exit F
>  GLIBC_2.12 _IO_2_1_stderr_ D 0xa0
> diff --git a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
> index 53dc99c45a..cb0054f532 100644
> --- a/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/tile/tilegx/tilegx64/libc.abilist
> @@ -1,3 +1,5 @@
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.12 GLIBC_2.12 A
>  GLIBC_2.12 _Exit F
>  GLIBC_2.12 _IO_2_1_stderr_ D 0xe0
> diff --git a/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist b/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist
> index dcbfbc05ac..f598149374 100644
> --- a/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/tile/tilepro/libc.abilist
> @@ -1,3 +1,5 @@
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.12 GLIBC_2.12 A
>  GLIBC_2.12 _Exit F
>  GLIBC_2.12 _IO_2_1_stderr_ D 0xa0
> diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> index ae4dcaa47e..70a15fa003 100644
> --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
> @@ -1,3 +1,5 @@
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.10 GLIBC_2.10 A
>  GLIBC_2.10 __cxa_at_quick_exit F
>  GLIBC_2.10 __posix_getopt F
> diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> index 0dbda14796..afbdec65d5 100644
> --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
> @@ -1,3 +1,5 @@
> +GLBIC_2.27 GLBIC_2.27 A
> +GLBIC_2.27 pthread_thread_number_np F
>  GLIBC_2.16 GLIBC_2.16 A
>  GLIBC_2.16 _Exit F
>  GLIBC_2.16 _IO_2_1_stderr_ D 0xa0<div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br />
<table style="border-top: 1px solid #D3D4DE;">
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        <td style="width: 55px; padding-top: 13px;"><a
href="http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail";
target="_blank"><img
src="https://ipmcdn.avast.com/images/icons/icon-envelope-tick-green-avg-v1.png";
alt="" width="46" height="29" style="width: 46px; height: 29px;"
/></a></td>
		<td style="width: 470px; padding-top: 12px; color: #41424e;
font-size: 13px; font-family: Arial, Helvetica, sans-serif;
line-height: 18px;">Virus-free. <a
href="http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail";
target="_blank" style="color: #4453ea;">www.avg.com</a>
		</td>
	</tr>
</table><a href="#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1"
height="1"></a></div>


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