| /* |
| * |
| * Copyright 2015 gRPC authors. |
| * |
| * 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. |
| * |
| */ |
| |
| #ifndef GRPC_IMPL_CODEGEN_ATM_GCC_SYNC_H |
| #define GRPC_IMPL_CODEGEN_ATM_GCC_SYNC_H |
| |
| /* variant of atm_platform.h for gcc and gcc-like compiers with __sync_* |
| interface */ |
| #include <grpc/impl/codegen/port_platform.h> |
| |
| typedef intptr_t gpr_atm; |
| #define GPR_ATM_MAX INTPTR_MAX |
| #define GPR_ATM_MIN INTPTR_MIN |
| |
| #define GPR_ATM_COMPILE_BARRIER_() __asm__ __volatile__("" : : : "memory") |
| |
| #if defined(__i386) || defined(__x86_64__) |
| /* All loads are acquire loads and all stores are release stores. */ |
| #define GPR_ATM_LS_BARRIER_() GPR_ATM_COMPILE_BARRIER_() |
| #else |
| #define GPR_ATM_LS_BARRIER_() gpr_atm_full_barrier() |
| #endif |
| |
| #define gpr_atm_full_barrier() (__sync_synchronize()) |
| |
| static __inline gpr_atm gpr_atm_acq_load(const gpr_atm *p) { |
| gpr_atm value = *p; |
| GPR_ATM_LS_BARRIER_(); |
| return value; |
| } |
| |
| static __inline gpr_atm gpr_atm_no_barrier_load(const gpr_atm *p) { |
| gpr_atm value = *p; |
| GPR_ATM_COMPILE_BARRIER_(); |
| return value; |
| } |
| |
| static __inline void gpr_atm_rel_store(gpr_atm *p, gpr_atm value) { |
| GPR_ATM_LS_BARRIER_(); |
| *p = value; |
| } |
| |
| static __inline void gpr_atm_no_barrier_store(gpr_atm *p, gpr_atm value) { |
| GPR_ATM_COMPILE_BARRIER_(); |
| *p = value; |
| } |
| |
| #undef GPR_ATM_LS_BARRIER_ |
| #undef GPR_ATM_COMPILE_BARRIER_ |
| |
| #define gpr_atm_no_barrier_fetch_add(p, delta) \ |
| gpr_atm_full_fetch_add((p), (delta)) |
| #define gpr_atm_full_fetch_add(p, delta) (__sync_fetch_and_add((p), (delta))) |
| |
| #define gpr_atm_no_barrier_cas(p, o, n) gpr_atm_acq_cas((p), (o), (n)) |
| #define gpr_atm_acq_cas(p, o, n) (__sync_bool_compare_and_swap((p), (o), (n))) |
| #define gpr_atm_rel_cas(p, o, n) gpr_atm_acq_cas((p), (o), (n)) |
| #define gpr_atm_full_cas(p, o, n) gpr_atm_acq_cas((p), (o), (n)) |
| |
| static __inline gpr_atm gpr_atm_full_xchg(gpr_atm *p, gpr_atm n) { |
| gpr_atm cur; |
| do { |
| cur = gpr_atm_acq_load(p); |
| } while (!gpr_atm_rel_cas(p, cur, n)); |
| return cur; |
| } |
| |
| #endif /* GRPC_IMPL_CODEGEN_ATM_GCC_SYNC_H */ |