map.h

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#include "detail/slab_node.h"
#include "detail/traverse.h"
#include "device_allocator.h"
#include <thrust/device_vector.h>
#include <cuda.h>
#include <cuda/std/utility>
#include "hash.h"
#include "detail/map_kernels.h"
 
#pragma once
 
namespace lslab {
 
template<typename K, typename V, typename Allocator = device_allocator<detail::slab_node<K, V>>, typename Hash = hash<K>>
class map {
public:
 
    using this_t = map<K, V, Allocator, Hash>;
 
    LSLAB_HOST map() : map(10) {
        
    }
 
    LSLAB_HOST map(unsigned n_log_2) : number_of_buckets_log_2(n_log_2) {
        size_t size = 1 << n_log_2;
        cudaMalloc(&lock_table, sizeof(warp_mutex) * size);
 
        cudaMemset(lock_table, 0, sizeof(warp_mutex) * size);
 
        cudaMalloc(&buckets_array, sizeof(detail::slab_node<K, V>) * size);
        
        cudaMemset(buckets_array, 0, sizeof(detail::slab_node<K, V>) * size);
    }
 
    LSLAB_HOST map(unsigned n_log_2, Allocator&& a) : number_of_buckets_log_2(n_log_2), alloc(a) {
        size_t size = 1 << n_log_2;
        cudaMalloc(&lock_table, sizeof(warp_mutex) * size);
 
        cudaMemset(lock_table, 0, sizeof(warp_mutex) * size);
 
        cudaMalloc(&buckets_array, sizeof(detail::slab_node<K, V>) * size);
        
        cudaMemset(buckets_array, 0, sizeof(detail::slab_node<K, V>) * size);
    }
 
    LSLAB_HOST_DEVICE map(warp_mutex* lt, detail::slab_node<K, V>* s, unsigned n_log_2) : lock_table(lt), buckets_array(s), number_of_buckets_log_2(n_log_2) {
 
    }
 
    LSLAB_DEVICE map(warp_mutex* lt, detail::slab_node<K, V>* s, unsigned n_log_2, Allocator&& a) : lock_table(lt), buckets_array(s), number_of_buckets_log_2(n_log_2), alloc(a) {
 
    }
 
    LSLAB_HOST_DEVICE ~map() {
    } 
 
    template<typename Fn>
    LSLAB_DEVICE void find_function(const K& key, Fn&& fn, bool thread_mask = true) {
 
        size_t hash = Hash{}(key);
        hash &= ((1 << number_of_buckets_log_2) - 1);
 
        detail::traverse<Allocator, detail::OPERATION_TYPE::FIND>{}(lock_table, buckets_array, key, fn, alloc, hash, thread_mask); 
    }
 
    LSLAB_DEVICE bool get(const K& key, V& value, bool thread_mask = true) {
        struct Fn {
            LSLAB_DEVICE void operator()(const V& val) {
                value = val;
                found = true;
            }
            bool found;
            V& value;
        };
 
        Fn fn{false, value};
 
        find_function(key, fn, thread_mask);
        return fn.found;
    }
 
    template<typename Fn>
    LSLAB_DEVICE void insert_function(const K& key, Fn&& fn, bool thread_mask = true) {
        using traverse_t = detail::traverse<Allocator, detail::OPERATION_TYPE::INSERT>;
        traverse_t t;
        size_t hash = Hash{}(key) & ((1 << number_of_buckets_log_2) - 1);
        t.template operator()<K, V, Fn>(lock_table, buckets_array, key, std::forward<Fn>(fn), alloc, hash, thread_mask); 
    }
 
    LSLAB_DEVICE V put(const K& key, const V& value, bool thread_mask = true) {
        
        struct Fn_put {
 
            LSLAB_DEVICE void operator()(V& val) {
                tmp = val;
                val = value;
            }
            const V& value;
            V tmp;
        };
 
        Fn_put fn{value};
 
        insert_function(key, fn, thread_mask);
        return fn.tmp;
    }
 
    template<typename Fn>
    LSLAB_DEVICE bool update_function(const K& key, Fn&& fn, bool thread_mask = true) {
        detail::traverse<Allocator, detail::OPERATION_TYPE::UPDATE>{}(lock_table, buckets_array, key, fn, alloc, Hash{}(key) & ((1 << number_of_buckets_log_2) - 1), thread_mask); 
    }
 
    LSLAB_DEVICE cuda::std::pair<bool, V> update(const K& key, const V& value, bool thread_mask = true) {
        struct Fn {
            LSLAB_DEVICE void operator()(V& val) {
                tmp = value;
                val = value;
                found = true;
            }
            bool found;
            const V& value;
            V tmp;
        };
 
        Fn fn{false, value};
 
        update_function(key, fn, thread_mask);
        return {fn.found, fn.tmp};
    }
 
    template<int block_size = 256>
    LSLAB_HOST void put(cuda::std::pair<K, V>* operations, V* output, size_t size, cudaStream_t stream = 0x0) {
        map_kernels::put_<block_size, this_t, K, V><<<(size + block_size - 1) / block_size, block_size, 0, stream>>>(*this, operations, output, size);
    }
 
    template<int block_size = 256>
    LSLAB_HOST void put(K* operations_keys, V* operations_values, V* output, size_t size, cudaStream_t stream = 0x0) {
        map_kernels::put_<block_size, this_t, K, V><<<(size + block_size - 1) / block_size, block_size, 0, stream>>>(*this, operations_keys, operations_values, output, size);
    }
 
 
    template<int block_size = 256>
    LSLAB_HOST void get(K* operations, cuda::std::pair<bool, V>* output, size_t size, cudaStream_t stream = 0x0) {
        map_kernels::get_<block_size, this_t, K, V><<<(size + block_size - 1) / block_size, block_size, 0, stream>>>(*this, operations, output, size);
    }
 
    template<int block_size = 256>
    LSLAB_HOST void update(cuda::std::pair<K, V>* operations, cuda::std::pair<bool, V>* output, size_t size, cudaStream_t stream = 0x0) {
        map_kernels::update_<block_size, this_t, K, V><<<(size + block_size - 1) / block_size, block_size, 0, stream>>>(*this, operations, output, size);
    }
 
    LSLAB_HOST_DEVICE unsigned buckets() {
        return 1 << number_of_buckets_log_2;
    }
 
private:
    warp_mutex* lock_table;
    detail::slab_node<K, V>* buckets_array;
    unsigned number_of_buckets_log_2;
    Allocator alloc;
};
 
}