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Diffstat (limited to 'REORG.TODO/sysdeps/m68k/coldfire/atomic-machine.h')
| -rw-r--r-- | REORG.TODO/sysdeps/m68k/coldfire/atomic-machine.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/m68k/coldfire/atomic-machine.h b/REORG.TODO/sysdeps/m68k/coldfire/atomic-machine.h new file mode 100644 index 0000000000..d2e4a1f15d --- /dev/null +++ b/REORG.TODO/sysdeps/m68k/coldfire/atomic-machine.h @@ -0,0 +1,75 @@ +/* Copyright (C) 2003-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _ATOMIC_MACHINE_H +#define _ATOMIC_MACHINE_H 1 + +#include <stdint.h> + +/* Coldfire has no atomic compare-and-exchange operation, and the + kernel provides no userspace atomicity operations. Here we just + use generic non-atomic implementations instead. */ + +typedef int8_t atomic8_t; +typedef uint8_t uatomic8_t; +typedef int_fast8_t atomic_fast8_t; +typedef uint_fast8_t uatomic_fast8_t; + +typedef int16_t atomic16_t; +typedef uint16_t uatomic16_t; +typedef int_fast16_t atomic_fast16_t; +typedef uint_fast16_t uatomic_fast16_t; + +typedef int32_t atomic32_t; +typedef uint32_t uatomic32_t; +typedef int_fast32_t atomic_fast32_t; +typedef uint_fast32_t uatomic_fast32_t; + +typedef int64_t atomic64_t; +typedef uint64_t uatomic64_t; +typedef int_fast64_t atomic_fast64_t; +typedef uint_fast64_t uatomic_fast64_t; + +typedef intptr_t atomicptr_t; +typedef uintptr_t uatomicptr_t; +typedef intmax_t atomic_max_t; +typedef uintmax_t uatomic_max_t; + +/* If we have just non-atomic operations, we can as well make them wide. */ +#define __HAVE_64B_ATOMICS 1 +#define USE_ATOMIC_COMPILER_BUILTINS 0 + +/* XXX Is this actually correct? */ +#define ATOMIC_EXCHANGE_USES_CAS 1 + +/* The only basic operation needed is compare and exchange. */ +#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ + ({ __typeof (mem) __gmemp = (mem); \ + __typeof (*mem) __gret = *__gmemp; \ + __typeof (*mem) __gnewval = (newval); \ + \ + if (__gret == (oldval)) \ + *__gmemp = __gnewval; \ + __gret; }) + +#define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \ + ({ __typeof (mem) __gmemp = (mem); \ + __typeof (*mem) __gnewval = (newval); \ + \ + *__gmemp == (oldval) ? (*__gmemp = __gnewval, 0) : 1; }) + +#endif |