[PATCH 05/13] linux: nptl: Consolidate __futex_abstimed_wait_{cancelable}64
Lukasz Majewski
lukma@denx.de
Tue Nov 24 18:19:09 GMT 2020
Hi Adhemerval,
> The only different is how to issue the syscall.
>
> Checked on x86_64-linux-gnu and i686-linux-gnu.
> ---
> sysdeps/nptl/futex-internal.c | 111
> +++++++++++----------------------- 1 file changed, 35 insertions(+),
> 76 deletions(-)
>
> diff --git a/sysdeps/nptl/futex-internal.c
> b/sysdeps/nptl/futex-internal.c index e4a14b477c..f9a2e28ee6 100644
> --- a/sysdeps/nptl/futex-internal.c
> +++ b/sysdeps/nptl/futex-internal.c
> @@ -24,10 +24,10 @@
>
> #ifndef __ASSUME_TIME64_SYSCALLS
> static int
> -__futex_abstimed_wait_cancelable32 (unsigned int* futex_word,
> - unsigned int expected, int op,
> - const struct __timespec64*
> abstime,
> - int private)
> +__futex_abstimed_wait_common32 (unsigned int* futex_word,
> + unsigned int expected, int op,
> + const struct __timespec64* abstime,
> + int private, bool cancel)
> {
> struct timespec ts32, *pts32 = NULL;
> if (abstime != NULL)
> @@ -39,34 +39,16 @@ __futex_abstimed_wait_cancelable32 (unsigned int*
> futex_word, pts32 = &ts32;
> }
>
> - return INTERNAL_SYSCALL_CANCEL (futex, futex_word, op, expected,
> + if (cancel)
> + return INTERNAL_SYSCALL_CANCEL (futex, futex_word, op, expected,
> + pts32, NULL /* Unused. */,
> + FUTEX_BITSET_MATCH_ANY);
> + else
> + return INTERNAL_SYSCALL_CALL (futex, futex_word, op, expected,
> pts32, NULL /* Unused. */,
> FUTEX_BITSET_MATCH_ANY);
> }
>
> -static int
> -__futex_abstimed_wait32 (unsigned int* futex_word,
> - unsigned int expected, clockid_t clockid,
> - const struct __timespec64* abstime,
> - int private)
> -{
> - struct timespec ts32;
> -
> - if (abstime != NULL && ! in_time_t_range (abstime->tv_sec))
> - return -EOVERFLOW;
> -
> - unsigned int clockbit = (clockid == CLOCK_REALTIME) ?
> - FUTEX_CLOCK_REALTIME : 0;
> - int op = __lll_private_flag (FUTEX_WAIT_BITSET | clockbit,
> private); -
> - if (abstime != NULL)
> - ts32 = valid_timespec64_to_timespec (*abstime);
> -
> - return INTERNAL_SYSCALL_CALL (futex, futex_word, op, expected,
> - abstime != NULL ? &ts32 : NULL,
> - NULL /* Unused. */,
> FUTEX_BITSET_MATCH_ANY); -}
> -
> static int
> __futex_clock_wait_bitset32 (int *futexp, int val, clockid_t clockid,
> const struct __timespec64 *abstime, int
> private) @@ -89,11 +71,11 @@ __futex_clock_wait_bitset32 (int
> *futexp, int val, clockid_t clockid, }
> #endif /* ! __ASSUME_TIME64_SYSCALLS */
>
> -int
> -__futex_abstimed_wait_cancelable64 (unsigned int* futex_word,
> - unsigned int expected, clockid_t
> clockid,
> - const struct __timespec64*
> abstime,
> - int private)
> +static int
> +__futex_abstimed_wait_common64 (unsigned int* futex_word,
> + unsigned int expected, clockid_t
> clockid,
> + const struct __timespec64* abstime,
> + int private, bool cancel)
> {
> unsigned int clockbit;
> int err;
> @@ -109,13 +91,18 @@ __futex_abstimed_wait_cancelable64 (unsigned
> int* futex_word, clockbit = (clockid == CLOCK_REALTIME) ?
> FUTEX_CLOCK_REALTIME : 0; int op = __lll_private_flag
> (FUTEX_WAIT_BITSET | clockbit, private);
> - err = INTERNAL_SYSCALL_CANCEL (futex_time64, futex_word, op,
> expected,
> - abstime, NULL /* Unused. */,
> + if (cancel)
> + err = INTERNAL_SYSCALL_CANCEL (futex_time64, futex_word, op,
> expected,
> + abstime, NULL /* Unused. */,
> + FUTEX_BITSET_MATCH_ANY);
> + else
> + err = INTERNAL_SYSCALL_CALL (futex_time64, futex_word, op,
> expected,
> + abstime, NULL /* Ununsed. */,
> FUTEX_BITSET_MATCH_ANY);
> #ifndef __ASSUME_TIME64_SYSCALLS
> if (err == -ENOSYS)
> - err = __futex_abstimed_wait_cancelable32 (futex_word, expected,
> - op, abstime, private);
> + err = __futex_abstimed_wait_common32 (futex_word, expected, op,
> abstime,
> + private, cancel);
> #endif
>
> switch (err)
> @@ -145,46 +132,18 @@ __futex_abstimed_wait64 (unsigned int*
> futex_word, unsigned int expected, clockid_t clockid,
> const struct __timespec64* abstime, int
> private) {
> - unsigned int clockbit;
> - int err;
> -
> - /* Work around the fact that the kernel rejects negative timeout
> values
> - despite them being valid. */
> - if (__glibc_unlikely ((abstime != NULL) && (abstime->tv_sec < 0)))
> - return ETIMEDOUT;
> -
> - if (! lll_futex_supported_clockid (clockid))
> - return EINVAL;
> -
> - clockbit = (clockid == CLOCK_REALTIME) ? FUTEX_CLOCK_REALTIME : 0;
> - int op = __lll_private_flag (FUTEX_WAIT_BITSET | clockbit,
> private); -
> - err = INTERNAL_SYSCALL_CALL (futex_time64, futex_word, op,
> expected,
> - abstime, NULL /* Unused. */,
> - FUTEX_BITSET_MATCH_ANY);
> -#ifndef __ASSUME_TIME64_SYSCALLS
> - if (err == -ENOSYS)
> - err = __futex_abstimed_wait32 (futex_word, expected,
> - clockid, abstime, private);
> -#endif
> - switch (err)
> - {
> - case 0:
> - case -EAGAIN:
> - case -EINTR:
> - case -ETIMEDOUT:
> - return -err;
> + return __futex_abstimed_wait_common64 (futex_word, expected,
> clockid,
> + abstime, private, false);
> +}
>
> - case -EFAULT: /* Must have been caused by a glibc or application
> bug. */
> - case -EINVAL: /* Either due to wrong alignment, unsupported
> - clockid or due to the timeout not being
> - normalized. Must have been caused by a glibc or
> - application bug. */
> - case -ENOSYS: /* Must have been caused by a glibc bug. */
> - /* No other errors are documented at this time. */
> - default:
> - futex_fatal_error ();
> - }
> +int
> +__futex_abstimed_wait_cancelable64 (unsigned int* futex_word,
> + unsigned int expected, clockid_t
> clockid,
> + const struct __timespec64*
> abstime,
> + int private)
> +{
> + return __futex_abstimed_wait_common64 (futex_word, expected,
> clockid,
> + abstime, private, true);
> }
>
> int
Thanks for making this consolidation. Indeed there is now only
difference in issuing the syscall.
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Best regards,
Lukasz Majewski
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de
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