84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
/*
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*
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* Copyright 2015 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#ifndef GRPC_IMPL_CODEGEN_ATM_GCC_SYNC_H
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#define GRPC_IMPL_CODEGEN_ATM_GCC_SYNC_H
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/* variant of atm_platform.h for gcc and gcc-like compiers with __sync_*
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interface */
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#include <grpc/impl/codegen/port_platform.h>
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typedef intptr_t gpr_atm;
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#define GPR_ATM_MAX INTPTR_MAX
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#define GPR_ATM_MIN INTPTR_MIN
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#define GPR_ATM_COMPILE_BARRIER_() __asm__ __volatile__("" : : : "memory")
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#if defined(__i386) || defined(__x86_64__)
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/* All loads are acquire loads and all stores are release stores. */
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#define GPR_ATM_LS_BARRIER_() GPR_ATM_COMPILE_BARRIER_()
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#else
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#define GPR_ATM_LS_BARRIER_() gpr_atm_full_barrier()
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#endif
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#define gpr_atm_full_barrier() (__sync_synchronize())
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static __inline gpr_atm gpr_atm_acq_load(const gpr_atm* p) {
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gpr_atm value = *p;
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GPR_ATM_LS_BARRIER_();
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return value;
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}
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static __inline gpr_atm gpr_atm_no_barrier_load(const gpr_atm* p) {
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gpr_atm value = *p;
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GPR_ATM_COMPILE_BARRIER_();
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return value;
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}
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static __inline void gpr_atm_rel_store(gpr_atm* p, gpr_atm value) {
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GPR_ATM_LS_BARRIER_();
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*p = value;
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}
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static __inline void gpr_atm_no_barrier_store(gpr_atm* p, gpr_atm value) {
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GPR_ATM_COMPILE_BARRIER_();
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*p = value;
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}
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#undef GPR_ATM_LS_BARRIER_
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#undef GPR_ATM_COMPILE_BARRIER_
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#define gpr_atm_no_barrier_fetch_add(p, delta) \
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gpr_atm_full_fetch_add((p), (delta))
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#define gpr_atm_full_fetch_add(p, delta) (__sync_fetch_and_add((p), (delta)))
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#define gpr_atm_no_barrier_cas(p, o, n) gpr_atm_acq_cas((p), (o), (n))
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#define gpr_atm_acq_cas(p, o, n) (__sync_bool_compare_and_swap((p), (o), (n)))
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#define gpr_atm_rel_cas(p, o, n) gpr_atm_acq_cas((p), (o), (n))
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#define gpr_atm_full_cas(p, o, n) gpr_atm_acq_cas((p), (o), (n))
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static __inline gpr_atm gpr_atm_full_xchg(gpr_atm* p, gpr_atm n) {
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gpr_atm cur;
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do {
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cur = gpr_atm_acq_load(p);
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} while (!gpr_atm_rel_cas(p, cur, n));
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return cur;
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}
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#endif /* GRPC_IMPL_CODEGEN_ATM_GCC_SYNC_H */
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