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++ /****************************************************************************
++ **
++ ** Copyright (C) 2016 Intel Corporation.
++ **
++ ** Permission is hereby granted, free of charge, to any person obtaining a copy
++ ** of this software and associated documentation files (the "Software"), to deal
++ ** in the Software without restriction, including without limitation the rights
++ ** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
++ ** copies of the Software, and to permit persons to whom the Software is
++ ** furnished to do so, subject to the following conditions:
++ **
++ ** The above copyright notice and this permission notice shall be included in
++ ** all copies or substantial portions of the Software.
++ **
++ ** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
++ ** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
++ ** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
++ ** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
++ ** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
++ ** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
++ ** THE SOFTWARE.
++ **
++ ****************************************************************************/
++
++ #ifndef FFD_ATOMIC_GCC_H
++ #define FFD_ATOMIC_GCC_H
++
++ /* atomics */
++ /* we'll use the GCC 4.7 atomic builtins
++ * Or in texinfo: C Extensions > __atomic Builtins
++ */
++ typedef int ffd_atomic_int;
++ #define ffd_atomic_pointer(type) type*
++
++ #define FFD_ATOMIC_INIT(val) (val)
++
++ #define FFD_ATOMIC_RELAXED __ATOMIC_RELAXED
++ #define FFD_ATOMIC_ACQUIRE __ATOMIC_ACQUIRE
++ #define FFD_ATOMIC_RELEASE __ATOMIC_RELEASE
++ // acq_rel & cst not necessary
++
++ #if !defined(__GNUC__) || \
++ ((__GNUC__ - 0) * 100 + (__GNUC_MINOR__ - 0)) < 407 || \
++ (defined(__INTEL_COMPILER) && __INTEL_COMPILER-0 < 1310) || \
++ (defined(__clang__) && ((__clang_major__-0) * 100 + (__clang_minor-0)) < 303)
++ #define ffd_atomic_load_n(ptr,order) *(ptr)
++ #define ffd_atomic_store_n(ptr,val,order) (*(ptr) = (val), (void)0)
++ #define ffd_atomic_exchange_n(ptr,val,order) __sync_lock_test_and_set(ptr, val)
++ #define ffd_atomic_compare_exchange_n(ptr,expected,desired,weak,order1,order2) \
++ __sync_bool_compare_and_swap(ptr, *(expected), desired) ? 1 : \
++ (*(expected) = *(ptr), 0)
++ #define ffd_atomic_add_fetch(ptr,val,order) __sync_add_and_fetch(ptr, val)
++ #else
++ #define ffd_atomic_load(ptr,order) __atomic_load_n(ptr, order)
++ #define ffd_atomic_store(ptr,val,order) __atomic_store_n(ptr, val, order)
++ #define ffd_atomic_exchange(ptr,val,order) __atomic_exchange_n(ptr, val, order)
++ #define ffd_atomic_compare_exchange(ptr,expected,desired,order1,order2) \
++ __atomic_compare_exchange_n(ptr, expected, desired, 1, order1, order2)
++ #define ffd_atomic_add_fetch(ptr,val,order) __atomic_add_fetch(ptr, val, order)
++ #endif
++
++ #endif