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127 lines
4.1 KiB
127 lines
4.1 KiB
/*
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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_WINDOWS_H
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#define GRPC_IMPL_CODEGEN_ATM_WINDOWS_H
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/** Win32 variant of atm_platform.h */
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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_full_barrier MemoryBarrier
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static __inline gpr_atm gpr_atm_acq_load(const gpr_atm* p) {
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gpr_atm result = *p;
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gpr_atm_full_barrier();
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return result;
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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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/* TODO(dklempner): Can we implement something better here? */
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return gpr_atm_acq_load(p);
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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_full_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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/* TODO(ctiller): Can we implement something better here? */
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gpr_atm_rel_store(p, value);
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}
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static __inline int gpr_atm_no_barrier_cas(gpr_atm* p, gpr_atm o, gpr_atm n) {
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/** InterlockedCompareExchangePointerNoFence() not available on vista or
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windows7 */
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#ifdef GPR_ARCH_64
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return o == (gpr_atm)InterlockedCompareExchangeAcquire64(
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(volatile LONGLONG*)p, (LONGLONG)n, (LONGLONG)o);
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#else
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return o == (gpr_atm)InterlockedCompareExchangeAcquire((volatile LONG*)p,
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(LONG)n, (LONG)o);
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#endif
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}
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static __inline int gpr_atm_acq_cas(gpr_atm* p, gpr_atm o, gpr_atm n) {
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#ifdef GPR_ARCH_64
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return o == (gpr_atm)InterlockedCompareExchangeAcquire64(
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(volatile LONGLONG*)p, (LONGLONG)n, (LONGLONG)o);
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#else
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return o == (gpr_atm)InterlockedCompareExchangeAcquire((volatile LONG*)p,
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(LONG)n, (LONG)o);
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#endif
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}
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static __inline int gpr_atm_rel_cas(gpr_atm* p, gpr_atm o, gpr_atm n) {
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#ifdef GPR_ARCH_64
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return o == (gpr_atm)InterlockedCompareExchangeRelease64(
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(volatile LONGLONG*)p, (LONGLONG)n, (LONGLONG)o);
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#else
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return o == (gpr_atm)InterlockedCompareExchangeRelease((volatile LONG*)p,
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(LONG)n, (LONG)o);
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#endif
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}
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static __inline int gpr_atm_full_cas(gpr_atm* p, gpr_atm o, gpr_atm n) {
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#ifdef GPR_ARCH_64
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return o == (gpr_atm)InterlockedCompareExchange64((volatile LONGLONG*)p,
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(LONGLONG)n, (LONGLONG)o);
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#else
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return o == (gpr_atm)InterlockedCompareExchange((volatile LONG*)p, (LONG)n,
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(LONG)o);
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#endif
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}
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static __inline gpr_atm gpr_atm_no_barrier_fetch_add(gpr_atm* p,
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gpr_atm delta) {
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/** Use the CAS operation to get pointer-sized fetch and add */
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gpr_atm old;
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do {
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old = *p;
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} while (!gpr_atm_no_barrier_cas(p, old, old + delta));
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return old;
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}
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static __inline gpr_atm gpr_atm_full_fetch_add(gpr_atm* p, gpr_atm delta) {
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/** Use a CAS operation to get pointer-sized fetch and add */
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gpr_atm old;
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#ifdef GPR_ARCH_64
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do {
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old = *p;
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} while (old != (gpr_atm)InterlockedCompareExchange64((volatile LONGLONG*)p,
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(LONGLONG)old + delta,
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(LONGLONG)old));
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#else
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do {
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old = *p;
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} while (old != (gpr_atm)InterlockedCompareExchange(
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(volatile LONG*)p, (LONG)old + delta, (LONG)old));
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#endif
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return old;
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}
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static __inline gpr_atm gpr_atm_full_xchg(gpr_atm* p, gpr_atm n) {
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return (gpr_atm)InterlockedExchangePointer((PVOID*)p, (PVOID)n);
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}
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#endif /* GRPC_IMPL_CODEGEN_ATM_WINDOWS_H */
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