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