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215078017f
To help y2038 work avoid duplicate all the logic of nanosleep on
non cancellable version, the patch replace it with a new futex
operation, lll_timedwait. The changes are:
- Add a expected value for __lll_clocklock_wait, so it can be used
to wait for generic values.
- Remove its internal atomic operation and move the logic to
__lll_clocklock. It makes __lll_clocklock_wait even more generic
and __lll_clocklock slight faster on fast-path (since it won't
require a function call anymore).
- Add lll_timedwait, which uses __lll_clocklock_wait, to replace both
__pause_nocancel and __nanosleep_nocancel.
It also allows remove the sparc32 __lll_clocklock_wait implementation
(since it is similar to the generic one).
Checked on x86_64-linux-gnu, sparcv9-linux-gnu, and i686-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
/* Timed low level locking for pthread library. Generic futex-using version.
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Copyright (C) 2003-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <atomic.h>
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#include <errno.h>
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#include <lowlevellock.h>
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#include <sys/time.h>
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#include <time.h>
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int
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__lll_clocklock_wait (int *futex, int val, clockid_t clockid,
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const struct timespec *abstime, int private)
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{
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struct timespec ts, *tsp = NULL;
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if (abstime != NULL)
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{
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/* Reject invalid timeouts. */
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if (! valid_nanoseconds (abstime->tv_nsec))
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return EINVAL;
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/* Get the current time. This can only fail if clockid is not valid. */
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if (__glibc_unlikely (__clock_gettime (clockid, &ts) != 0))
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return EINVAL;
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/* Compute relative timeout. */
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ts.tv_sec = abstime->tv_sec - ts.tv_sec;
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ts.tv_nsec = abstime->tv_nsec - ts.tv_nsec;
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if (ts.tv_nsec < 0)
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{
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ts.tv_nsec += 1000000000;
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--ts.tv_sec;
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}
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if (ts.tv_sec < 0)
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return ETIMEDOUT;
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tsp = &ts;
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}
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/* If *futex == val, wait until woken or timeout. */
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lll_futex_timed_wait (futex, val, tsp, private);
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return 0;
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}
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