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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>
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* low level locking for pthread library. SPARC 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 <errno.h>
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#include <sysdep.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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void
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__lll_lock_wait_private (int *futex)
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{
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do
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{
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int oldval = atomic_compare_and_exchange_val_24_acq (futex, 2, 1);
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if (oldval != 0)
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lll_futex_wait (futex, 2, LLL_PRIVATE);
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}
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while (atomic_compare_and_exchange_val_24_acq (futex, 2, 0) != 0);
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}
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/* These functions don't get included in libc.so */
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#if IS_IN (libpthread)
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void
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__lll_lock_wait (int *futex, int private)
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{
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do
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{
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int oldval = atomic_compare_and_exchange_val_24_acq (futex, 2, 1);
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if (oldval != 0)
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lll_futex_wait (futex, 2, private);
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}
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while (atomic_compare_and_exchange_val_24_acq (futex, 2, 0) != 0);
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}
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#endif
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