The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
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95 lines
3.3 KiB
95 lines
3.3 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_H |
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#define GRPC_IMPL_CODEGEN_ATM_H |
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/** This interface provides atomic operations and barriers. |
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It is internal to gpr support code and should not be used outside it. |
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If an operation with acquire semantics precedes another memory access by the |
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same thread, the operation will precede that other access as seen by other |
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threads. |
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If an operation with release semantics follows another memory access by the |
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same thread, the operation will follow that other access as seen by other |
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threads. |
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Routines with "acq" or "full" in the name have acquire semantics. Routines |
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with "rel" or "full" in the name have release semantics. Routines with |
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"no_barrier" in the name have neither acquire not release semantics. |
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The routines may be implemented as macros. |
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// Atomic operations act on an intergral_type gpr_atm that is guaranteed to |
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// be the same size as a pointer. |
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typedef intptr_t gpr_atm; |
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// A memory barrier, providing both acquire and release semantics, but not |
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// otherwise acting on memory. |
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void gpr_atm_full_barrier(void); |
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// Atomically return *p, with acquire semantics. |
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gpr_atm gpr_atm_acq_load(gpr_atm *p); |
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gpr_atm gpr_atm_no_barrier_load(gpr_atm *p); |
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// Atomically set *p = value, with release semantics. |
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void gpr_atm_rel_store(gpr_atm *p, gpr_atm value); |
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// Atomically add delta to *p, and return the old value of *p, with |
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// the barriers specified. |
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gpr_atm gpr_atm_no_barrier_fetch_add(gpr_atm *p, gpr_atm delta); |
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gpr_atm gpr_atm_full_fetch_add(gpr_atm *p, gpr_atm delta); |
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// Atomically, if *p==o, set *p=n and return non-zero otherwise return 0, |
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// with the barriers specified if the operation succeeds. |
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int gpr_atm_no_barrier_cas(gpr_atm *p, gpr_atm o, gpr_atm n); |
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int gpr_atm_acq_cas(gpr_atm *p, gpr_atm o, gpr_atm n); |
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int gpr_atm_rel_cas(gpr_atm *p, gpr_atm o, gpr_atm n); |
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int gpr_atm_full_cas(gpr_atm *p, gpr_atm o, gpr_atm n); |
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// Atomically, set *p=n and return the old value of *p |
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gpr_atm gpr_atm_full_xchg(gpr_atm *p, gpr_atm n); |
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*/ |
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#include <grpc/impl/codegen/port_platform.h> |
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#if defined(GPR_GCC_ATOMIC) |
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#include <grpc/impl/codegen/atm_gcc_atomic.h> |
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#elif defined(GPR_GCC_SYNC) |
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#include <grpc/impl/codegen/atm_gcc_sync.h> |
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#elif defined(GPR_WINDOWS_ATOMIC) |
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#include <grpc/impl/codegen/atm_windows.h> |
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#else |
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#error could not determine platform for atm |
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#endif |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/** Adds \a delta to \a *value, clamping the result to the range specified |
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by \a min and \a max. Returns the new value. */ |
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gpr_atm gpr_atm_no_barrier_clamped_add(gpr_atm* value, gpr_atm delta, |
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gpr_atm min, gpr_atm max); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* GRPC_IMPL_CODEGEN_ATM_H */
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