[PATCH 2/2] y2038: Convert gai_suspend to support 64 bit time
Adhemerval Zanella
adhemerval.zanella@linaro.org
Tue Dec 1 12:32:29 GMT 2020
On 01/12/2020 06:44, Lukasz Majewski wrote:
> This change uses (in gai_misc.h):
> - __futex_abstimed_wait64 (instead of futex_reltimed_wait)
> - __futex_abstimed_wait_cancellable64
> (instead of futex_reltimed_wait_cancellable)
> from ./sysdeps/nptl/futex-helpers.h
>
> The gai_suspend() accepts relative timeout, which then is converted to
> absolute one.
>
> The i686-gnu port (HURD) do not define DONT_NEED_GAI_MISC_COND and as it
> doesn't (yet) support 64 bit time it uses not converted
> pthread_cond_timedwait().
>
> The __gai_suspend() is supposed to be run on ports with __TIMESIZE !=64 and
> __WORDSIZE==32. It internally utilizes __gai_suspend_time64() and hence the
> conversion from 32 bit struct timespec to 64 bit one is required.
>
> For ports supporting 64 bit time the __gai_suspend_time64() will be used
> either via alias (to __gai_suspend when __TIMESIZE==64) or redirection
> (when -D_TIME_BITS=64 is passed).
>
> Build tests:
> ./src/scripts/build-many-glibcs.py glibcs
LGTM, thanks.
As a side note we can now remove futex_reltimed_wait{_cancelable} and make
the __futex_abstimed_wait{_cancelable64} the futex block function.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
> ---
> include/netdb.h | 7 +++++
> resolv/gai_suspend.c | 61 ++++++++++++++++++++++++-----------------
> sysdeps/nptl/gai_misc.h | 11 +++++---
> 3 files changed, 50 insertions(+), 29 deletions(-)
>
> diff --git a/include/netdb.h b/include/netdb.h
> index 49d63c1338..645b85dc62 100644
> --- a/include/netdb.h
> +++ b/include/netdb.h
> @@ -194,6 +194,13 @@ extern int ruserpass (const char *host, const char **aname,
> const char **apass);
> libc_hidden_proto (ruserpass)
>
> +# if __TIMESIZE == 64
> +# define __gai_suspend_time64 __gai_suspend
> +# else
> +extern int __gai_suspend_time64 (const struct gaicb *const list[], int ent,
> + const struct __timespec64 *timeout);
> +libanl_hidden_proto (__gai_suspend_time64)
> +# endif
>
> /* The following definition has been removed from the public header
> since we don't want people to use them. */
Ok.
> diff --git a/resolv/gai_suspend.c b/resolv/gai_suspend.c
> index 734f9b4500..d75abeb7e3 100644
> --- a/resolv/gai_suspend.c
> +++ b/resolv/gai_suspend.c
> @@ -24,10 +24,9 @@
>
> #include <gai_misc.h>
>
> -
> int
> -gai_suspend (const struct gaicb *const list[], int ent,
> - const struct timespec *timeout)
> +__gai_suspend_time64 (const struct gaicb *const list[], int ent,
> + const struct __timespec64 *timeout)
> {
> struct waitlist waitlist[ent];
> struct requestlist *requestlist[ent];
> @@ -63,6 +62,19 @@ gai_suspend (const struct gaicb *const list[], int ent,
> }
> }
>
> + struct __timespec64 ts;
> + if (timeout != NULL)
> + {
> + __clock_gettime64 (CLOCK_MONOTONIC, &ts);
> + ts.tv_sec += timeout->tv_sec;
> + ts.tv_nsec += timeout->tv_nsec;
> + if (ts.tv_nsec >= 1000000000)
> + {
> + ts.tv_nsec -= 1000000000;
> + ts.tv_sec++;
> + }
> + }
> +
> if (none)
> {
> if (cnt < ent)
> @@ -83,29 +95,11 @@ gai_suspend (const struct gaicb *const list[], int ent,
>
> #ifdef DONT_NEED_GAI_MISC_COND
> result = 0;
> - GAI_MISC_WAIT (result, cntr, timeout, 1);
> + GAI_MISC_WAIT (result, cntr, timeout == NULL ? NULL : &ts, 1);
> #else
> - if (timeout == NULL)
> - result = pthread_cond_wait (&cond, &__gai_requests_mutex);
> - else
> - {
> - /* We have to convert the relative timeout value into an
> - absolute time value with pthread_cond_timedwait expects. */
> - struct timespec now;
> - struct timespec abstime;
> -
> - __clock_gettime (CLOCK_REALTIME, &now);
> - abstime.tv_nsec = timeout->tv_nsec + now.tv_nsec;
> - abstime.tv_sec = timeout->tv_sec + now.tv_sec;
> - if (abstime.tv_nsec >= 1000000000)
> - {
> - abstime.tv_nsec -= 1000000000;
> - abstime.tv_sec += 1;
> - }
> -
> - result = pthread_cond_timedwait (&cond, &__gai_requests_mutex,
> - &abstime);
> - }
> + struct timespec ts32 = valid_timespec64_to_timespec (ts);
> + result = pthread_cond_timedwait (&cond, &__gai_requests_mutex,
> + timeout == NULL ? NULL : &ts32);
> #endif
>
> /* Now remove the entry in the waiting list for all requests
Ok.
> @@ -155,3 +149,20 @@ gai_suspend (const struct gaicb *const list[], int ent,
>
> return result;
> }
> +
> +#if __TIMESIZE != 64
> +libanl_hidden_def (__gai_suspend_time64)
> +
> +int
> +__gai_suspend (const struct gaicb *const list[], int ent,
> + const struct timespec *timeout)
> +{
> + struct __timespec64 ts64;
> +
> + if (timeout != NULL)
> + ts64 = valid_timespec_to_timespec64 (*timeout);
> +
> + return __gai_suspend_time64 (list, ent, timeout != NULL ? &ts64 : NULL);
> +}
> +#endif
> +weak_alias (__gai_suspend, gai_suspend)
Ok.
> diff --git a/sysdeps/nptl/gai_misc.h b/sysdeps/nptl/gai_misc.h
> index c1d5e2e6f0..c72a863974 100644
> --- a/sysdeps/nptl/gai_misc.h
> +++ b/sysdeps/nptl/gai_misc.h
> @@ -46,11 +46,12 @@
> do \
> { \
> if (cancel) \
> - status = futex_reltimed_wait_cancelable ( \
> - (unsigned int *) futexaddr, oldval, timeout, FUTEX_PRIVATE); \
> + status = __futex_abstimed_wait_cancelable64 ( \
> + (unsigned int *) futexaddr, oldval, CLOCK_MONOTONIC, timeout, \
> + FUTEX_PRIVATE); \
> else \
> - status = futex_reltimed_wait ((unsigned int *) futexaddr, \
> - oldval, timeout, FUTEX_PRIVATE); \
> + status = __futex_abstimed_wait64 ((unsigned int *) futexaddr, \
> + oldval, CLOCK_REALTIME, timeout, FUTEX_PRIVATE); \
> if (status != EAGAIN) \
> break; \
> \
> @@ -62,6 +63,8 @@
> result = EINTR; \
> else if (status == ETIMEDOUT) \
> result = EAGAIN; \
> + else if (status == EOVERFLOW) \
> + result = EOVERFLOW; \
> else \
> assert (status == 0 || status == EAGAIN); \
> \
>
Ok.
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