listing_6.12.cpp

#include <map>
#include <vector>
#include <shared_mutex>
#include <mutex>

typedef int Key;
typedef int Value;

std::map<Key,Value> threadsafe_lookup_table::get_map() const
{
    std::vector<std::unique_lock<std::shared_mutex> > locks;
    for(unsigned i=0;i<buckets.size();++i)
    {
        locks.push_back(
            std::unique_lock<std::shared_mutex>(buckets[i].mutex));
    }
    std::map<Key,Value> res;
    for(unsigned i=0;i<buckets.size();++i)
    {
        for(bucket_iterator it=buckets[i].data.begin();
            it!=buckets[i].data.end();
            ++it)
        {
            res.insert(*it);
        }
    }
    return res;
}