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/*
*
* 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_INC_CAS_THEN(blah) blah
#define GPR_ATM_INC_ADD_THEN(blah) blah
#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 */
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