[PATCH v2 3/3] y2038: Convert thrd_sleep to support 64 bit time

[Alistair Francis]

On Tue, Nov 3, 2020 at 1:15 AM Lukasz Majewski <lukma@denx.de> wrote:
>
> The thrd_sleep 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
> clock_nanosleep() supporting 64 bit time.
>
> The thrd_sleep is a wrapper on POSIX threads to provide C11 standard
> threads interface. It directly calls __clock_nanosleep64().
>
> Build tests:
> ./src/scripts/build-many-glibcs.py glibcs

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

Alistair

> ---
>  sysdeps/pthread/thrd_priv.h          |  4 ++
>  sysdeps/unix/sysv/linux/thrd_sleep.c | 55 ++++++++++++++++++++++++++++
>  2 files changed, 59 insertions(+)
>  create mode 100644 sysdeps/unix/sysv/linux/thrd_sleep.c
>
> diff --git a/sysdeps/pthread/thrd_priv.h b/sysdeps/pthread/thrd_priv.h
> index efe453bdec..c53d47a02c 100644
> --- a/sysdeps/pthread/thrd_priv.h
> +++ b/sysdeps/pthread/thrd_priv.h
> @@ -27,6 +27,7 @@
>  #if __TIMESIZE == 64
>  # define __cnd_timedwait64 __cnd_timedwait
>  # define __mtx_timedlock64 __mtx_timedlock
> +# define __thrd_sleep64 __thrd_sleep
>  #else
>  extern int __cnd_timedwait64 (cnd_t *restrict cond, mtx_t *restrict mutex,
>                                const struct __timespec64* restrict time_point);
> @@ -34,6 +35,9 @@ libpthread_hidden_proto (__cnd_timedwait64)
>  extern int __mtx_timedlock64 (mtx_t *restrict mutex,
>                                const struct __timespec64 *restrict time_point);
>  libpthread_hidden_proto (__mtx_timedlock64)
> +extern int __thrd_sleep64 (const struct __timespec64* time_point,
> +                           struct __timespec64* remaining);
> +libpthread_hidden_proto (__thrd_sleep64)
>  #endif
>
>  static __always_inline int
> diff --git a/sysdeps/unix/sysv/linux/thrd_sleep.c b/sysdeps/unix/sysv/linux/thrd_sleep.c
> new file mode 100644
> index 0000000000..632527d26a
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/thrd_sleep.c
> @@ -0,0 +1,55 @@
> +/* C11 threads thread sleep 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 <sysdep-cancel.h>
> +
> +#include "thrd_priv.h"
> +
> +int
> +__thrd_sleep64 (const struct __timespec64* time_point,
> +                struct __timespec64* remaining)
> +{
> +  int ret = __clock_nanosleep_time64 (CLOCK_REALTIME, 0, time_point, remaining);
> +  /* C11 states thrd_sleep function returns -1 if it has been interrupted
> +     by a signal, or a negative value if it fails.  */
> +  switch (ret)
> +  {
> +     case 0:      return 0;
> +     case EINTR:  return -1;
> +     default:     return -2;
> +  }
> +}
> +
> +#if __TIMESIZE != 64
> +libpthread_hidden_def (__thrd_sleep64)
> +
> +int
> +__thrd_sleep (const struct timespec* time_point, struct timespec* remaining)
> +{
> +  const struct __timespec64 treq64 = valid_timespec_to_timespec64 (*time_point);
> +  struct __timespec64 trem64;
> +
> +  int ret = __thrd_sleep64 (&treq64, &trem64);
> +  if (ret == -1 && remaining != NULL)
> +    *remaining = valid_timespec64_to_timespec (trem64);
> +
> +  return ret;
> +}
> +#endif
> +weak_alias (__thrd_sleep, thrd_sleep)
> --
> 2.20.1
>