The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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100 lines
4.1 KiB
100 lines
4.1 KiB
/* |
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* |
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* Copyright 2015, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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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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// 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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// 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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/** 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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#endif /* GRPC_IMPL_CODEGEN_ATM_H */
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