spinlock.h

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/*
 * Copyright 2025 NVIDIA Corporation
 * SPDX-License-Identifier: Apache-2.0
 *
 * 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 SPINLOCK_H
#define SPINLOCK_H
 
#include <pthread.h>
 
namespace Realm {
  namespace UCP {
 
    class SpinLock {
    public:
      SpinLock()
      {
        int ret = pthread_spin_init(&pth_spinlock, PTHREAD_PROCESS_PRIVATE);
        assert(ret == 0);
      }
 
      ~SpinLock()
      {
        int ret = pthread_spin_destroy(&pth_spinlock);
        assert(ret == 0);
      }
 
      int lock() { return pthread_spin_lock(&pth_spinlock); }
 
      int unlock() { return pthread_spin_unlock(&pth_spinlock); }
 
      int trylock()
      {
        if(pthread_spin_trylock(&pth_spinlock) == 0)
          return 1;
        return 0;
      }
 
    private:
      pthread_spinlock_t pth_spinlock;
    };
 
  }; // namespace UCP
 
}; // namespace Realm
 
#endif