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cf31a2c799
Way back in 2005 the atomic_exchange_and_add function was cleaned up to avoid the explicit size checking and instead let gcc handle things itself. Unfortunately that change ended up leaving beyond a cast to int, even when the incoming value was a long. This has flown under the radar for a long time due to the function not being heavily used in the tree (especially as a full 64bit field), but a recent change to semaphores made some nptl tests fail reliably. This is due to the code packing two 32bit values into one 64bit variable (where the high 32bits contained the number of waiters), and then the whole variable being atomically updated between threads. On ia64, that meant we never atomically updated the count, so sometimes the sem_post would not wake up the waiters.
120 lines
4.0 KiB
C
120 lines
4.0 KiB
C
/* Copyright (C) 2003-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<http://www.gnu.org/licenses/>. */
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#include <stdint.h>
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#include <ia64intrin.h>
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typedef int8_t atomic8_t;
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typedef uint8_t uatomic8_t;
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typedef int_fast8_t atomic_fast8_t;
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typedef uint_fast8_t uatomic_fast8_t;
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typedef int16_t atomic16_t;
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typedef uint16_t uatomic16_t;
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typedef int_fast16_t atomic_fast16_t;
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typedef uint_fast16_t uatomic_fast16_t;
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typedef int32_t atomic32_t;
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typedef uint32_t uatomic32_t;
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typedef int_fast32_t atomic_fast32_t;
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typedef uint_fast32_t uatomic_fast32_t;
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typedef int64_t atomic64_t;
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typedef uint64_t uatomic64_t;
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typedef int_fast64_t atomic_fast64_t;
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typedef uint_fast64_t uatomic_fast64_t;
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typedef intptr_t atomicptr_t;
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typedef uintptr_t uatomicptr_t;
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typedef intmax_t atomic_max_t;
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typedef uintmax_t uatomic_max_t;
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#define __HAVE_64B_ATOMICS 1
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#define USE_ATOMIC_COMPILER_BUILTINS 0
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#define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \
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(abort (), 0)
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#define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \
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(abort (), 0)
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#define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval) \
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(!__sync_bool_compare_and_swap ((mem), (int) (long) (oldval), \
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(int) (long) (newval)))
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#define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval) \
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(!__sync_bool_compare_and_swap ((mem), (long) (oldval), \
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(long) (newval)))
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#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
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(abort (), (__typeof (*mem)) 0)
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#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
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(abort (), (__typeof (*mem)) 0)
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#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
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__sync_val_compare_and_swap ((mem), (int) (long) (oldval), \
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(int) (long) (newval))
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#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
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__sync_val_compare_and_swap ((mem), (long) (oldval), (long) (newval))
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/* Atomically store newval and return the old value. */
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#define atomic_exchange_acq(mem, value) \
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__sync_lock_test_and_set (mem, value)
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#define atomic_exchange_rel(mem, value) \
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(__sync_synchronize (), __sync_lock_test_and_set (mem, value))
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#define atomic_exchange_and_add(mem, value) \
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__sync_fetch_and_add ((mem), (value))
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#define atomic_decrement_if_positive(mem) \
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({ __typeof (*mem) __oldval, __val; \
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__typeof (mem) __memp = (mem); \
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\
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__val = (*__memp); \
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do \
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{ \
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__oldval = __val; \
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if (__builtin_expect (__val <= 0, 0)) \
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break; \
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__val = atomic_compare_and_exchange_val_acq (__memp, __oldval - 1, \
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__oldval); \
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} \
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while (__builtin_expect (__val != __oldval, 0)); \
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__oldval; })
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#define atomic_bit_test_set(mem, bit) \
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({ __typeof (*mem) __oldval, __val; \
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__typeof (mem) __memp = (mem); \
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__typeof (*mem) __mask = ((__typeof (*mem)) 1 << (bit)); \
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\
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__val = (*__memp); \
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do \
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{ \
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__oldval = __val; \
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__val = atomic_compare_and_exchange_val_acq (__memp, \
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__oldval | __mask, \
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__oldval); \
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} \
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while (__builtin_expect (__val != __oldval, 0)); \
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__oldval & __mask; })
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#define atomic_full_barrier() __sync_synchronize ()
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