| /* |
| * Copyright (c) 2008-2016 Apple Inc. All rights reserved. |
| * |
| * @APPLE_APACHE_LICENSE_HEADER_START@ |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| * @APPLE_APACHE_LICENSE_HEADER_END@ |
| */ |
| |
| /* |
| * IMPORTANT: This header file describes INTERNAL interfaces to libdispatch |
| * which are subject to change in future releases of Mac OS X. Any applications |
| * relying on these interfaces WILL break. |
| */ |
| |
| #ifndef __DISPATCH_SHIMS_ATOMIC__ |
| #define __DISPATCH_SHIMS_ATOMIC__ |
| |
| #if !__has_extension(c_atomic) || !__has_include(<stdatomic.h>) |
| #error libdispatch requires C11 with <stdatomic.h> |
| #endif |
| |
| #include <stdatomic.h> |
| |
| #define memory_order_ordered memory_order_seq_cst |
| #define memory_order_dependency memory_order_acquire |
| |
| #define os_atomic(type) type _Atomic |
| |
| #define _os_atomic_c11_atomic(p) \ |
| ((typeof(*(p)) _Atomic *)(p)) |
| |
| // This removes the _Atomic and volatile qualifiers on the type of *p |
| #define _os_atomic_basetypeof(p) \ |
| typeof(atomic_load_explicit(_os_atomic_c11_atomic(p), memory_order_relaxed)) |
| |
| #define os_atomic_load(p, m) \ |
| atomic_load_explicit(_os_atomic_c11_atomic(p), memory_order_##m) |
| #define os_atomic_store(p, v, m) \ |
| atomic_store_explicit(_os_atomic_c11_atomic(p), v, memory_order_##m) |
| #define os_atomic_xchg(p, v, m) \ |
| atomic_exchange_explicit(_os_atomic_c11_atomic(p), v, memory_order_##m) |
| #define os_atomic_cmpxchg(p, e, v, m) \ |
| ({ _os_atomic_basetypeof(p) _r = (e); \ |
| atomic_compare_exchange_strong_explicit(_os_atomic_c11_atomic(p), \ |
| &_r, v, memory_order_##m, memory_order_relaxed); }) |
| #define os_atomic_cmpxchgv(p, e, v, g, m) \ |
| ({ _os_atomic_basetypeof(p) _r = (e); _Bool _b = \ |
| atomic_compare_exchange_strong_explicit(_os_atomic_c11_atomic(p), \ |
| &_r, v, memory_order_##m, memory_order_relaxed); *(g) = _r; _b; }) |
| #define os_atomic_cmpxchgvw(p, e, v, g, m) \ |
| ({ _os_atomic_basetypeof(p) _r = (e); _Bool _b = \ |
| atomic_compare_exchange_weak_explicit(_os_atomic_c11_atomic(p), \ |
| &_r, v, memory_order_##m, memory_order_relaxed); *(g) = _r; _b; }) |
| |
| #define _os_atomic_c11_op(p, v, m, o, op) \ |
| ({ _os_atomic_basetypeof(p) _v = (v), _r = \ |
| atomic_fetch_##o##_explicit(_os_atomic_c11_atomic(p), _v, \ |
| memory_order_##m); (typeof(*(p)))(_r op _v); }) |
| #define _os_atomic_c11_op_orig(p, v, m, o, op) \ |
| atomic_fetch_##o##_explicit(_os_atomic_c11_atomic(p), v, \ |
| memory_order_##m) |
| #define os_atomic_add(p, v, m) \ |
| _os_atomic_c11_op((p), (v), m, add, +) |
| #define os_atomic_add_orig(p, v, m) \ |
| _os_atomic_c11_op_orig((p), (v), m, add, +) |
| #define os_atomic_sub(p, v, m) \ |
| _os_atomic_c11_op((p), (v), m, sub, -) |
| #define os_atomic_sub_orig(p, v, m) \ |
| _os_atomic_c11_op_orig((p), (v), m, sub, -) |
| #define os_atomic_and(p, v, m) \ |
| _os_atomic_c11_op((p), (v), m, and, &) |
| #define os_atomic_and_orig(p, v, m) \ |
| _os_atomic_c11_op_orig((p), (v), m, and, &) |
| #define os_atomic_or(p, v, m) \ |
| _os_atomic_c11_op((p), (v), m, or, |) |
| #define os_atomic_or_orig(p, v, m) \ |
| _os_atomic_c11_op_orig((p), (v), m, or, |) |
| #define os_atomic_xor(p, v, m) \ |
| _os_atomic_c11_op((p), (v), m, xor, ^) |
| #define os_atomic_xor_orig(p, v, m) \ |
| _os_atomic_c11_op_orig((p), (v), m, xor, ^) |
| |
| #define os_atomic_force_dependency_on(p, e) (p) |
| #define os_atomic_load_with_dependency_on(p, e) \ |
| os_atomic_load(os_atomic_force_dependency_on(p, e), relaxed) |
| #define os_atomic_load_with_dependency_on2o(p, f, e) \ |
| os_atomic_load_with_dependency_on(&(p)->f, e) |
| |
| #define os_atomic_thread_fence(m) atomic_thread_fence(memory_order_##m) |
| |
| #define os_atomic_load2o(p, f, m) \ |
| os_atomic_load(&(p)->f, m) |
| #define os_atomic_store2o(p, f, v, m) \ |
| os_atomic_store(&(p)->f, (v), m) |
| #define os_atomic_xchg2o(p, f, v, m) \ |
| os_atomic_xchg(&(p)->f, (v), m) |
| #define os_atomic_cmpxchg2o(p, f, e, v, m) \ |
| os_atomic_cmpxchg(&(p)->f, (e), (v), m) |
| #define os_atomic_cmpxchgv2o(p, f, e, v, g, m) \ |
| os_atomic_cmpxchgv(&(p)->f, (e), (v), (g), m) |
| #define os_atomic_cmpxchgvw2o(p, f, e, v, g, m) \ |
| os_atomic_cmpxchgvw(&(p)->f, (e), (v), (g), m) |
| #define os_atomic_add2o(p, f, v, m) \ |
| os_atomic_add(&(p)->f, (v), m) |
| #define os_atomic_add_orig2o(p, f, v, m) \ |
| os_atomic_add_orig(&(p)->f, (v), m) |
| #define os_atomic_sub2o(p, f, v, m) \ |
| os_atomic_sub(&(p)->f, (v), m) |
| #define os_atomic_sub_orig2o(p, f, v, m) \ |
| os_atomic_sub_orig(&(p)->f, (v), m) |
| #define os_atomic_and2o(p, f, v, m) \ |
| os_atomic_and(&(p)->f, (v), m) |
| #define os_atomic_and_orig2o(p, f, v, m) \ |
| os_atomic_and_orig(&(p)->f, (v), m) |
| #define os_atomic_or2o(p, f, v, m) \ |
| os_atomic_or(&(p)->f, (v), m) |
| #define os_atomic_or_orig2o(p, f, v, m) \ |
| os_atomic_or_orig(&(p)->f, (v), m) |
| #define os_atomic_xor2o(p, f, v, m) \ |
| os_atomic_xor(&(p)->f, (v), m) |
| #define os_atomic_xor_orig2o(p, f, v, m) \ |
| os_atomic_xor_orig(&(p)->f, (v), m) |
| |
| #define os_atomic_inc(p, m) \ |
| os_atomic_add((p), 1, m) |
| #define os_atomic_inc_orig(p, m) \ |
| os_atomic_add_orig((p), 1, m) |
| #define os_atomic_inc2o(p, f, m) \ |
| os_atomic_add2o(p, f, 1, m) |
| #define os_atomic_inc_orig2o(p, f, m) \ |
| os_atomic_add_orig2o(p, f, 1, m) |
| #define os_atomic_dec(p, m) \ |
| os_atomic_sub((p), 1, m) |
| #define os_atomic_dec_orig(p, m) \ |
| os_atomic_sub_orig((p), 1, m) |
| #define os_atomic_dec2o(p, f, m) \ |
| os_atomic_sub2o(p, f, 1, m) |
| #define os_atomic_dec_orig2o(p, f, m) \ |
| os_atomic_sub_orig2o(p, f, 1, m) |
| |
| #define os_atomic_rmw_loop(p, ov, nv, m, ...) ({ \ |
| bool _result = false; \ |
| typeof(p) _p = (p); \ |
| ov = os_atomic_load(_p, relaxed); \ |
| do { \ |
| __VA_ARGS__; \ |
| _result = os_atomic_cmpxchgvw(_p, ov, nv, &ov, m); \ |
| } while (os_unlikely(!_result)); \ |
| _result; \ |
| }) |
| #define os_atomic_rmw_loop2o(p, f, ov, nv, m, ...) \ |
| os_atomic_rmw_loop(&(p)->f, ov, nv, m, __VA_ARGS__) |
| #define os_atomic_rmw_loop_give_up_with_fence(m, expr) \ |
| ({ os_atomic_thread_fence(m); expr; __builtin_unreachable(); }) |
| #define os_atomic_rmw_loop_give_up(expr) \ |
| os_atomic_rmw_loop_give_up_with_fence(relaxed, expr) |
| |
| #endif // __DISPATCH_SHIMS_ATOMIC__ |