y2038: nptl: Convert sem_{clock|timed}wait to support 64 bit time

  The sem_clockwait and sem_timedwait have been converted to support 64 bit time.

This change reuses futex_abstimed_wait_cancelable64 function introduced earlier.
The sem_{clock|timed}wait only accepts absolute time. Moreover, there is no
need to check for NULL passed as *abstime pointer to the syscalls as both calls
have exported symbols marked with __nonull attribute for abstime.

For systems with __TIMESIZE != 64 && __WORDSIZE == 32:
- Conversion from 32 bit time to 64 bit struct __timespec64 was necessary
- Redirection to __sem_{clock|timed}wait64 will provide support for 64 bit
  time

Build tests:
./src/scripts/build-many-glibcs.py glibcs

Run-time tests:
- Run specific tests on ARM/x86 32bit systems (qemu):
  https://github.com/lmajewski/meta-y2038 and run tests:
  https://github.com/lmajewski/y2038-tests/commits/master

Above tests were performed with Y2038 redirection applied as well as without
to test the proper usage of both __sem_{clock|timed}wait64 and
__sem_{clock|timed}wait.
---
 nptl/sem_clockwait.c  | 20 +++++++++++++++++---
 nptl/sem_timedwait.c  | 20 +++++++++++++++++---
 nptl/sem_wait.c       |  5 +++--
 nptl/sem_waitcommon.c | 12 ++++++------
 nptl/semaphoreP.h     | 13 +++++++++++++
 5 files changed, 56 insertions(+), 14 deletions(-)
  

On 07/09/2020 18:41, Lukasz Majewski wrote:
> The sem_clockwait and sem_timedwait have been converted to support 64 bit time.
> 
> This change reuses futex_abstimed_wait_cancelable64 function introduced earlier.
> The sem_{clock|timed}wait only accepts absolute time. Moreover, there is no
> need to check for NULL passed as *abstime pointer to the syscalls as both calls
> have exported symbols marked with __nonull attribute for abstime.
> 
> For systems with __TIMESIZE != 64 && __WORDSIZE == 32:
> - Conversion from 32 bit time to 64 bit struct __timespec64 was necessary
> - Redirection to __sem_{clock|timed}wait64 will provide support for 64 bit
>   time
> 
> Build tests:
> ./src/scripts/build-many-glibcs.py glibcs
> 
> Run-time tests:
> - Run specific tests on ARM/x86 32bit systems (qemu):
>   https://github.com/lmajewski/meta-y2038 and run tests:
>   https://github.com/lmajewski/y2038-tests/commits/master
> 
> Above tests were performed with Y2038 redirection applied as well as without
> to test the proper usage of both __sem_{clock|timed}wait64 and
> __sem_{clock|timed}wait.

LGTM, thanks.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

> ---
>  nptl/sem_clockwait.c  | 20 +++++++++++++++++---
>  nptl/sem_timedwait.c  | 20 +++++++++++++++++---
>  nptl/sem_wait.c       |  5 +++--
>  nptl/sem_waitcommon.c | 12 ++++++------
>  nptl/semaphoreP.h     | 13 +++++++++++++
>  5 files changed, 56 insertions(+), 14 deletions(-)
> 
> diff --git a/nptl/sem_clockwait.c b/nptl/sem_clockwait.c
> index b9bae75183..1b93f00054 100644
> --- a/nptl/sem_clockwait.c
> +++ b/nptl/sem_clockwait.c
> @@ -19,11 +19,12 @@
>     <https://www.gnu.org/licenses/>.  */
>  
>  #include <time.h>
> +#include "semaphoreP.h"
>  #include "sem_waitcommon.c"
>  
>  int
> -sem_clockwait (sem_t *sem, clockid_t clockid,
> -	       const struct timespec *abstime)
> +__sem_clockwait64 (sem_t *sem, clockid_t clockid,
> +                   const struct __timespec64 *abstime)
>  {
>    /* Check that supplied clockid is one we support, even if we don't end up
>       waiting.  */
> @@ -42,5 +43,18 @@ sem_clockwait (sem_t *sem, clockid_t clockid,
>    if (__new_sem_wait_fast ((struct new_sem *) sem, 0) == 0)
>      return 0;
>    else
> -    return __new_sem_wait_slow ((struct new_sem *) sem, clockid, abstime);
> +    return __new_sem_wait_slow64 ((struct new_sem *) sem, clockid, abstime);
>  }
> +

Ok.

> +#if __TIMESIZE != 64
> +libpthread_hidden_def (__sem_clockwait64)
> +
> +int
> +__sem_clockwait (sem_t *sem, clockid_t clockid, const struct timespec *abstime)
> +{
> +  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*abstime);
> +
> +  return __sem_clockwait64 (sem, clockid, &ts64);
> +}
> +#endif
> +weak_alias (__sem_clockwait, sem_clockwait)

Ok.

> diff --git a/nptl/sem_timedwait.c b/nptl/sem_timedwait.c
> index 99c11bf20e..5d054c950d 100644
> --- a/nptl/sem_timedwait.c
> +++ b/nptl/sem_timedwait.c
> @@ -18,12 +18,13 @@
>     <https://www.gnu.org/licenses/>.  */
>  
>  #include <time.h>
> +#include "semaphoreP.h"
>  #include "sem_waitcommon.c"
>  
>  /* This is in a separate file because because sem_timedwait is only provided
>     if __USE_XOPEN2K is defined.  */
>  int
> -sem_timedwait (sem_t *sem, const struct timespec *abstime)
> +__sem_timedwait64 (sem_t *sem, const struct __timespec64 *abstime)
>  {
>    if (! valid_nanoseconds (abstime->tv_nsec))
>      {
> @@ -37,6 +38,19 @@ sem_timedwait (sem_t *sem, const struct timespec *abstime)
>    if (__new_sem_wait_fast ((struct new_sem *) sem, 0) == 0)
>      return 0;
>    else
> -    return __new_sem_wait_slow ((struct new_sem *) sem,
> -				CLOCK_REALTIME, abstime);
> +    return __new_sem_wait_slow64 ((struct new_sem *) sem,
> +				  CLOCK_REALTIME, abstime);
>  }
> +
> +#if __TIMESIZE != 64
> +libpthread_hidden_def (__sem_timedwait64)
> +
> +int
> +__sem_timedwait (sem_t *sem, const struct timespec *abstime)
> +{
> +  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*abstime);
> +
> +  return __sem_timedwait64 (sem, &ts64);
> +}
> +#endif
> +weak_alias (__sem_timedwait, sem_timedwait)

Ok.

> diff --git a/nptl/sem_wait.c b/nptl/sem_wait.c
> index 171716fdbc..9374e0aaf6 100644
> --- a/nptl/sem_wait.c
> +++ b/nptl/sem_wait.c
> @@ -18,6 +18,7 @@
>     <https://www.gnu.org/licenses/>.  */
>  
>  #include <lowlevellock.h>	/* lll_futex* used by the old code.  */
> +#include "semaphoreP.h"
>  #include "sem_waitcommon.c"
>  
>  int
> @@ -39,8 +40,8 @@ __new_sem_wait (sem_t *sem)
>    if (__new_sem_wait_fast ((struct new_sem *) sem, 0) == 0)
>      return 0;
>    else
> -    return __new_sem_wait_slow ((struct new_sem *) sem,
> -				CLOCK_REALTIME, NULL);
> +    return __new_sem_wait_slow64 ((struct new_sem *) sem,
> +				  CLOCK_REALTIME, NULL);
>  }
>  versioned_symbol (libpthread, __new_sem_wait, sem_wait, GLIBC_2_1);
>  

Ok.

> diff --git a/nptl/sem_waitcommon.c b/nptl/sem_waitcommon.c
> index 5a6d2643ee..6dd4eb97cb 100644
> --- a/nptl/sem_waitcommon.c
> +++ b/nptl/sem_waitcommon.c
> @@ -104,18 +104,18 @@ __sem_wait_cleanup (void *arg)
>  static int
>  __attribute__ ((noinline))
>  do_futex_wait (struct new_sem *sem, clockid_t clockid,
> -	       const struct timespec *abstime)
> +	       const struct __timespec64 *abstime)
>  {
>    int err;
>  
>  #if __HAVE_64B_ATOMICS
> -  err = futex_abstimed_wait_cancelable (
> +  err = __futex_abstimed_wait_cancelable64 (
>        (unsigned int *) &sem->data + SEM_VALUE_OFFSET, 0,
>        clockid, abstime,
>        sem->private);
>  #else
> -  err = futex_abstimed_wait_cancelable (&sem->value, SEM_NWAITERS_MASK,
> -					clockid, abstime, sem->private);
> +  err = __futex_abstimed_wait_cancelable64 (&sem->value, SEM_NWAITERS_MASK,
> +					    clockid, abstime, sem->private);
>  #endif
>  
>    return err;

Ok.

> @@ -162,8 +162,8 @@ __new_sem_wait_fast (struct new_sem *sem, int definitive_result)
>  /* Slow path that blocks.  */
>  static int
>  __attribute__ ((noinline))
> -__new_sem_wait_slow (struct new_sem *sem, clockid_t clockid,
> -		     const struct timespec *abstime)
> +__new_sem_wait_slow64 (struct new_sem *sem, clockid_t clockid,
> +		       const struct __timespec64 *abstime)
>  {
>    int err = 0;
>  

Ok.

> diff --git a/nptl/semaphoreP.h b/nptl/semaphoreP.h
> index e7e1c9763f..f25ba329d7 100644
> --- a/nptl/semaphoreP.h
> +++ b/nptl/semaphoreP.h
> @@ -52,3 +52,16 @@ extern int __new_sem_wait (sem_t *sem);
>  extern int __old_sem_wait (sem_t *sem);
>  extern int __new_sem_trywait (sem_t *sem);
>  extern int __new_sem_getvalue (sem_t *sem, int *sval);
> +
> +#if __TIMESIZE == 64
> +# define __sem_clockwait64 __sem_clockwait
> +# define __sem_timedwait64 __sem_timedwait
> +#else
> +extern int
> +__sem_clockwait64 (sem_t *sem, clockid_t clockid,
> +                   const struct __timespec64 *abstime);
> +libpthread_hidden_proto (__sem_clockwait64)
> +extern int
> +__sem_timedwait64 (sem_t *sem, const struct __timespec64 *abstime);
> +libpthread_hidden_proto (__sem_timedwait64)
> +#endif
> 

Ok.