// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you 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 BTHREAD_PRIME_OFFSET_H

#define BTHREAD_PRIME_OFFSET_H

#include "butil/fast_rand.h"

#include "butil/macros.h"

namespace bthread {

// Prime number offset for hash function.

inline size_t prime_offset(size_t seed) {

    uint32_t offsets[] = {

        #include "bthread/offset_inl.list"

    };

    return offsets[seed % ARRAY_SIZE(offsets)];

}

inline size_t prime_offset() {

    return prime_offset(butil::fast_rand());

}

}

#endif // BTHREAD_PRIME_OFFSET_H