| /* |
| * |
| * 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_ATOMIC_H |
| #define GRPC_IMPL_CODEGEN_ATM_GCC_ATOMIC_H |
| |
| /* atm_platform.h for gcc and gcc-like compilers with the |
| __atomic_* interface. */ |
| #include <grpc/impl/codegen/port_platform.h> |
| |
| typedef intptr_t gpr_atm; |
| #define GPR_ATM_MAX INTPTR_MAX |
| |
| #ifdef GPR_LOW_LEVEL_COUNTERS |
| extern gpr_atm gpr_counter_atm_cas; |
| extern gpr_atm gpr_counter_atm_add; |
| #define GPR_ATM_INC_COUNTER(counter) \ |
| __atomic_fetch_add(&counter, 1, __ATOMIC_RELAXED) |
| #define GPR_ATM_INC_CAS_THEN(blah) \ |
| (GPR_ATM_INC_COUNTER(gpr_counter_atm_cas), blah) |
| #define GPR_ATM_INC_ADD_THEN(blah) \ |
| (GPR_ATM_INC_COUNTER(gpr_counter_atm_add), blah) |
| #else |
| #define GPR_ATM_INC_CAS_THEN(blah) blah |
| #define GPR_ATM_INC_ADD_THEN(blah) blah |
| #endif |
| |
| #define gpr_atm_full_barrier() (__atomic_thread_fence(__ATOMIC_SEQ_CST)) |
| |
| #define gpr_atm_acq_load(p) (__atomic_load_n((p), __ATOMIC_ACQUIRE)) |
| #define gpr_atm_no_barrier_load(p) (__atomic_load_n((p), __ATOMIC_RELAXED)) |
| #define gpr_atm_rel_store(p, value) \ |
| (__atomic_store_n((p), (intptr_t)(value), __ATOMIC_RELEASE)) |
| #define gpr_atm_no_barrier_store(p, value) \ |
| (__atomic_store_n((p), (intptr_t)(value), __ATOMIC_RELAXED)) |
| |
| #define gpr_atm_no_barrier_fetch_add(p, delta) \ |
| GPR_ATM_INC_ADD_THEN( \ |
| __atomic_fetch_add((p), (intptr_t)(delta), __ATOMIC_RELAXED)) |
| #define gpr_atm_full_fetch_add(p, delta) \ |
| GPR_ATM_INC_ADD_THEN( \ |
| __atomic_fetch_add((p), (intptr_t)(delta), __ATOMIC_ACQ_REL)) |
| |
| static __inline int gpr_atm_no_barrier_cas(gpr_atm *p, gpr_atm o, gpr_atm n) { |
| return GPR_ATM_INC_CAS_THEN(__atomic_compare_exchange_n( |
| p, &o, n, 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED)); |
| } |
| |
| static __inline int gpr_atm_acq_cas(gpr_atm *p, gpr_atm o, gpr_atm n) { |
| return GPR_ATM_INC_CAS_THEN(__atomic_compare_exchange_n( |
| p, &o, n, 0, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED)); |
| } |
| |
| static __inline int gpr_atm_rel_cas(gpr_atm *p, gpr_atm o, gpr_atm n) { |
| return GPR_ATM_INC_CAS_THEN(__atomic_compare_exchange_n( |
| p, &o, n, 0, __ATOMIC_RELEASE, __ATOMIC_RELAXED)); |
| } |
| |
| static __inline int gpr_atm_full_cas(gpr_atm *p, gpr_atm o, gpr_atm n) { |
| return GPR_ATM_INC_CAS_THEN(__atomic_compare_exchange_n( |
| p, &o, n, 0, __ATOMIC_ACQ_REL, __ATOMIC_RELAXED)); |
| } |
| |
| #define gpr_atm_full_xchg(p, n) \ |
| GPR_ATM_INC_CAS_THEN(__atomic_exchange_n((p), (n), __ATOMIC_ACQ_REL)) |
| |
| #endif /* GRPC_IMPL_CODEGEN_ATM_GCC_ATOMIC_H */ |