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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_CORE_LIB_SUPPORT_SPINLOCK_H
#define GRPC_CORE_LIB_SUPPORT_SPINLOCK_H
#include <grpc/support/atm.h>
/* Simple spinlock. No backoff strategy, gpr_spinlock_lock is almost always
a concurrency code smell. */
typedef struct {
gpr_atm atm;
} gpr_spinlock;
#ifdef __cplusplus
#define GPR_SPINLOCK_INITIALIZER (gpr_spinlock{0})
#else
#define GPR_SPINLOCK_INITIALIZER ((gpr_spinlock){0})
#endif
#define GPR_SPINLOCK_STATIC_INITIALIZER \
{ 0 }
#define gpr_spinlock_trylock(lock) (gpr_atm_acq_cas(&(lock)->atm, 0, 1))
#define gpr_spinlock_unlock(lock) (gpr_atm_rel_store(&(lock)->atm, 0))
#define gpr_spinlock_lock(lock) \
do { \
} while (!gpr_spinlock_trylock((lock)))
#endif /* GRPC_CORE_LIB_SUPPORT_SPINLOCK_H */
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