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Diffstat (limited to 'include')
| -rw-r--r-- | include/atomic.h | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/include/atomic.h b/include/atomic.h new file mode 100644 index 0000000000..813fb80a03 --- /dev/null +++ b/include/atomic.h @@ -0,0 +1,141 @@ +/* Copyright (C) 2002, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#ifndef _ATOMIC_H +#define _ATOMIC_H 1 + +#include <stdlib.h> + +#include <bits/atomic.h> + + +#ifndef atomic_compare_and_exchange_acq +# define atomic_compare_and_exchange_acq(mem, newval, oldval) \ + ({ __typeof (__arch_compare_and_exchange_32_acq (mem, newval, oldval)) \ + __result; \ + if (sizeof (*mem) == 1) \ + __result = __arch_compare_and_exchange_8_acq (mem, newval, oldval); \ + else if (sizeof (*mem) == 2) \ + __result = __arch_compare_and_exchange_16_acq (mem, newval, oldval); \ + else if (sizeof (*mem) == 4) \ + __result = __arch_compare_and_exchange_32_acq (mem, newval, oldval); \ + else if (sizeof (*mem) == 8) \ + __result = __arch_compare_and_exchange_64_acq (mem, newval, oldval); \ + else \ + abort (); \ + __result; }) +#endif + + +#ifndef atomic_compare_and_exchange_rel +# define atomic_compare_and_exchange_rel(mem, oldval, newval) \ + atomic_compare_and_exchange_acq (mem, oldval, newval) +#endif + + +#ifndef atomic_exchange_and_add +# define atomic_exchange_and_add(mem, value) \ + ({ __typeof (*mem) __oldval; \ + __typeof (mem) __memp = (mem); \ + __typeof (*mem) __value = (value); \ + \ + do \ + __oldval = (*__memp); \ + while (atomic_compare_and_exchange_acq (__memp, __oldval + __value, \ + __oldval)); \ + \ + __oldval + __value; }) +#endif + + +#ifndef atomic_add +# define atomic_add(mem, value) (void) atomic_exchange_and_add (mem, value) +#endif + + +#ifndef atomic_increment +# define atomic_increment(mem) atomic_add (mem, 1) +#endif + + +#ifndef atomic_increment_and_test +# define atomic_increment_and_test(mem) \ + (atomic_exchange_and_add (mem, 1) == 0) +#endif + + +#ifndef atomic_decrement +# define atomic_decrement(mem) atomic_add (mem, -1) +#endif + + +#ifndef atomic_decrement_and_test +# define atomic_decrement_and_test(mem) \ + (atomic_exchange_and_add (mem, -1) == 0) +#endif + + +#ifndef atomic_add_negative +# define atomic_add_negative(mem, value) \ + (atomic_exchange_and_add (mem, value) < 0) +#endif + + +#ifndef atomic_add_zero +# define atomic_add_zero(mem, value) \ + (atomic_exchange_and_add (mem, value) == 0) +#endif + + +#ifndef atomic_bit_set +# define atomic_bit_set(mem, bit) \ + (void) atomic_bit_test_set(mem, bit) +#endif + + +#ifndef atomic_bit_test_set +# define atomic_bit_test_set(mem, bit) \ + ({ __typeof (*mem) __oldval; \ + __typeof (mem) __memp = (mem); \ + __typeof (*mem) __mask = (1 << (bit)); \ + \ + do \ + __oldval = (*__memp); \ + while (atomic_compare_and_exchange_acq (__memp, \ + __oldval | __mask, __oldval)); \ + \ + __oldval & __mask; }) +#endif + + +#ifndef atomic_full_barrier +# define atomic_full_barrier() __asm ("" ::: "memory") +#endif + + +#ifndef atomic_read_barrier +# define atomic_read_barrier() atomic_full_barrier() +#endif + + +#ifndef atomic_write_barrier +# define atomic_write_barrier() atomic_full_barrier() +#endif + +#endif /* atomic.h */ |