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/*
*
* Copyright 2017, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef GRPC_CORE_LIB_SUPPORT_ATOMIC_WITH_ATM_H
#define GRPC_CORE_LIB_SUPPORT_ATOMIC_WITH_ATM_H
#include <grpc/support/atm.h>
namespace grpc_core {
enum MemoryOrderRelaxed { memory_order_relaxed };
template <class T>
class atomic;
template <>
class atomic<bool> {
public:
atomic() { gpr_atm_no_barrier_store(&x_, static_cast<gpr_atm>(false)); }
explicit atomic(bool x) {
gpr_atm_no_barrier_store(&x_, static_cast<gpr_atm>(x));
}
bool compare_exchange_strong(bool& expected, bool update, MemoryOrderRelaxed,
MemoryOrderRelaxed) {
if (!gpr_atm_no_barrier_cas(&x_, static_cast<gpr_atm>(expected),
static_cast<gpr_atm>(update))) {
expected = gpr_atm_no_barrier_load(&x_) != 0;
return false;
}
return true;
}
private:
gpr_atm x_;
};
} // namespace grpc_core
#endif /* GRPC_CORE_LIB_SUPPORT_ATOMIC_WITH_ATM_H */
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