[v2,1/3] y2038: Convert cnd_timedwait to support 64 bit time

  The cnd_timedwait function has been converted to support 64 bit time.
It was also necessary to provide Linux specific copy of it to avoid
problems on i686-gnu (i.e. HURD) port, which is not providing
pthread_cond_timedwait() supporting 64 bit time.

The cnd_timedwait is a wrapper on POSIX threads to provide C11 standard
threads interface. It directly calls __pthread_cond_timedwait64().

Build tests:
./src/scripts/build-many-glibcs.py glibcs
---
 sysdeps/pthread/thrd_priv.h             |  8 +++++
 sysdeps/unix/sysv/linux/cnd_timedwait.c | 44 +++++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/cnd_timedwait.c
  

On Tue, Nov 3, 2020 at 1:15 AM Lukasz Majewski <lukma@denx.de> wrote:
>
> The cnd_timedwait function has been converted to support 64 bit time.
> It was also necessary to provide Linux specific copy of it to avoid
> problems on i686-gnu (i.e. HURD) port, which is not providing
> pthread_cond_timedwait() supporting 64 bit time.
>
> The cnd_timedwait is a wrapper on POSIX threads to provide C11 standard
> threads interface. It directly calls __pthread_cond_timedwait64().
>
> Build tests:
> ./src/scripts/build-many-glibcs.py glibcs

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  sysdeps/pthread/thrd_priv.h             |  8 +++++
>  sysdeps/unix/sysv/linux/cnd_timedwait.c | 44 +++++++++++++++++++++++++
>  2 files changed, 52 insertions(+)
>  create mode 100644 sysdeps/unix/sysv/linux/cnd_timedwait.c
>
> diff --git a/sysdeps/pthread/thrd_priv.h b/sysdeps/pthread/thrd_priv.h
> index d22ad6f632..dbfec0df7a 100644
> --- a/sysdeps/pthread/thrd_priv.h
> +++ b/sysdeps/pthread/thrd_priv.h
> @@ -24,6 +24,14 @@
>  #include <errno.h>
>  #include "pthreadP.h"  /* For pthread_{mutex,cond}_t definitions.  */
>
> +#if __TIMESIZE == 64
> +# define __cnd_timedwait64 __cnd_timedwait
> +#else
> +extern int __cnd_timedwait64 (cnd_t *restrict cond, mtx_t *restrict mutex,
> +                              const struct __timespec64* restrict time_point);
> +libpthread_hidden_proto (__cnd_timedwait64)
> +#endif
> +
>  static __always_inline int
>  thrd_err_map (int err_code)
>  {
> diff --git a/sysdeps/unix/sysv/linux/cnd_timedwait.c b/sysdeps/unix/sysv/linux/cnd_timedwait.c
> new file mode 100644
> index 0000000000..5bf5a2d968
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/cnd_timedwait.c
> @@ -0,0 +1,44 @@
> +/* C11 threads conditional timed wait implementation - Linux variant.
> +   Copyright (C) 2020 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
> +   <https://www.gnu.org/licenses/>.  */
> +
> +#include <time.h>
> +#include "thrd_priv.h"
> +
> +int
> +__cnd_timedwait64 (cnd_t *restrict cond, mtx_t *restrict mutex,
> +                   const struct __timespec64* restrict time_point)
> +{
> +  int err_code = __pthread_cond_timedwait64 ((pthread_cond_t *) cond,
> +                                             (pthread_mutex_t *) mutex,
> +                                             time_point);
> +  return thrd_err_map (err_code);
> +}
> +
> +#if __TIMESIZE != 64
> +libpthread_hidden_def (__cnd_timedwait64)
> +
> +int
> +__cnd_timedwait (cnd_t *restrict cond, mtx_t *restrict mutex,
> +                 const struct timespec* restrict time_point)
> +{
> +  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*time_point);
> +
> +  return __cnd_timedwait64(cond, mutex, &ts64);
> +}
> +#endif
> +weak_alias (__cnd_timedwait, cnd_timedwait)
> --
> 2.20.1
>
  

On 03/11/2020 06:14, Lukasz Majewski wrote:
> The cnd_timedwait function has been converted to support 64 bit time.
> It was also necessary to provide Linux specific copy of it to avoid
> problems on i686-gnu (i.e. HURD) port, which is not providing
> pthread_cond_timedwait() supporting 64 bit time.
> 
> The cnd_timedwait is a wrapper on POSIX threads to provide C11 standard
> threads interface. It directly calls __pthread_cond_timedwait64().
> 
> Build tests:
> ./src/scripts/build-many-glibcs.py glibcs
> ---
>  sysdeps/pthread/thrd_priv.h             |  8 +++++
>  sysdeps/unix/sysv/linux/cnd_timedwait.c | 44 +++++++++++++++++++++++++
>  2 files changed, 52 insertions(+)
>  create mode 100644 sysdeps/unix/sysv/linux/cnd_timedwait.c
> 
> diff --git a/sysdeps/pthread/thrd_priv.h b/sysdeps/pthread/thrd_priv.h
> index d22ad6f632..dbfec0df7a 100644
> --- a/sysdeps/pthread/thrd_priv.h
> +++ b/sysdeps/pthread/thrd_priv.h
> @@ -24,6 +24,14 @@
>  #include <errno.h>
>  #include "pthreadP.h"	/* For pthread_{mutex,cond}_t definitions.  */
>  
> +#if __TIMESIZE == 64
> +# define __cnd_timedwait64 __cnd_timedwait
> +#else
> +extern int __cnd_timedwait64 (cnd_t *restrict cond, mtx_t *restrict mutex,
> +                              const struct __timespec64* restrict time_point);
> +libpthread_hidden_proto (__cnd_timedwait64)
> +#endif
> +
>  static __always_inline int
>  thrd_err_map (int err_code)
>  {

Although not really incorrect, since you we pushing a Linux only cnd_timedwait;
I think __cnd_timedwait64 should be made Linux only as well (to avoid Hurd
having a dangling __cnd_timewait64 definition).  The usual way is to add
a threads.h internal headers similar to the one for Linux sys/msg.h
(sysdeps/unix/sysv/linux/include/sys/msg.h).

> diff --git a/sysdeps/unix/sysv/linux/cnd_timedwait.c b/sysdeps/unix/sysv/linux/cnd_timedwait.c
> new file mode 100644
> index 0000000000..5bf5a2d968
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/cnd_timedwait.c
> @@ -0,0 +1,44 @@
> +/* C11 threads conditional timed wait implementation - Linux variant.
> +   Copyright (C) 2020 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
> +   <https://www.gnu.org/licenses/>.  */
> +
> +#include <time.h>
> +#include "thrd_priv.h"
> +
> +int
> +__cnd_timedwait64 (cnd_t *restrict cond, mtx_t *restrict mutex,
> +                   const struct __timespec64* restrict time_point)
> +{
> +  int err_code = __pthread_cond_timedwait64 ((pthread_cond_t *) cond,
> +                                             (pthread_mutex_t *) mutex,
> +                                             time_point);
> +  return thrd_err_map (err_code);
> +}
> +
> +#if __TIMESIZE != 64
> +libpthread_hidden_def (__cnd_timedwait64)
> +
> +int
> +__cnd_timedwait (cnd_t *restrict cond, mtx_t *restrict mutex,
> +                 const struct timespec* restrict time_point)
> +{
> +  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*time_point);
> +
> +  return __cnd_timedwait64(cond, mutex, &ts64);
> +}
> +#endif
> +weak_alias (__cnd_timedwait, cnd_timedwait)
> 

Ok.