Question

我正在使用libcds，他们有Michael Hash Map和Split order list的实现。

根据我从文档中收集的信息，我是如何实现它们的：

包括：

#include <cds/map/michael_hash_map.h>
#include <cds/map/split_ordered_list.h>
using namespace cds;

代码：

  class TestDs {
public:
    virtual bool containsKey(int key)=0;
    virtual int get(int key)=0;
    virtual int put(int key, int value)=0;
    virtual int remove(int key)=0;

    virtual int size()=0;
    virtual const char* name()=0;
    virtual void print()=0;
    virtual void shutdown()=0;
};

代码：

class Michael: public TestDs{
private:

    cds::map::MichaelHashMap<int,int,cds::map::pair_traits <int, int>, cds::map::type_traits, CDS_DEFAULT_ALLOCATOR> _ds;
public:
        Michael(const Configuration& config) : _ds(config.initial_count,config.load_factor) {
        }

    bool containsKey(int key) {
        return (_ds.find(key)!=0);
    }

    int get(int key) {
        return _ds.find(key);
    }

    int put(int key, int value) {
        return _ds.insert(key,value);
    }

    int remove(int key) {
        return _ds.erase(key);
    }

    int size() {
        return _ds.size();
    }
    const char* name() {
        return "Micheal";
    }
    void print() {}
    void shutdown() {}

};

并且：

class CDSSplit: public TestDs{
private:
    cds::map::SplitOrderedList<int,int,cds::map::pair_traits<int,int> ,cds::map::split_list::type_traits,CDS_DEFAULT_ALLOCATOR> _ds;
public:
    CDSSplit(const Configuration& config) : _ds(config.initial_count, config.load_factor) {
    }

    bool containsKey(int key) {
        return (_ds.find(key)!=0);
    }

    int get(int key) {
        return _ds.find(key);
    }

    int put(int key, int value) {
        return _ds.insert(key,value);
    }

    int remove(int key) {
        return _ds.erase(key);
    }

    int size() {
        return _ds.size();
    }
    const char* name() {
        return "CDSSPlit";
    }
    void print() {}
    void shutdown() {}

};

我通过调用

来启动结构

TestDs* _gTestDs1 = new Michael(_gConfiguration);
TestDs* _gTestDs2 = new CDSSplit(_gConfiguration);

然而，当启动CDSSplit时，或者迈克尔执行了第一次插入时，我会出现分段错误。

图书馆安装得很好，没有任何警告，我使用其他哈希表我没有收到任何错误。

感谢您的帮助

（也张贴了，图书馆的讨论页面上的细节较少，但似乎没有太多的存在，如果在那里发布任何内容，将回发）

编译标志：-std=c++0x -O3 -msse2 -m32 -DNDEBUG -DINTEL -g -D_REENTRANT -lrt -pthread -fno-strict-aliasing -l cds -l tbb -lllalloc

GDB输出：

    Program received signal SIGSEGV, Segmentation fault.
cds::ordered_list::details::michael_list::implementation<cds::gc::hzp_gc, cds::ordered_list::details::michael_list::adapter<cds::gc::hzp_gc, int, int, cds::map::pair_traits<int, int>, cds::ordered_list::type_traits, std::allocator<int> >, std::allocator<int> >::insert (this=0xafd42028, refHead=..., pNode=0x8440060) at /usr/include/cds/ordered_list/details/michael_list_hpgen.h:457
457             position pos( gc_base_class::getGC() )  ;
(gdb) backtrace
#0  cds::ordered_list::details::michael_list::implementation<cds::gc::hzp_gc, cds::ordered_list::details::michael_list::adapter<cds::gc::hzp_gc, int, int, cds::map::pair_traits<int, int>, cds::ordered_list::type_traits, std::allocator<int> >, std::allocator<int> >::insert (this=0xafd42028, refHead=..., pNode=0x8440060) at /usr/include/cds/ordered_list/details/michael_list_hpgen.h:457
#1  0x0805323e in insert (this=0x8470070, key=2, value=2) at /usr/include/cds/ordered_list/details/michael_list_hpgen.h:430
#2  insert (this=0x8470070, key=2, value=2) at /usr/include/cds/ordered_list/details/michael_list_hpgen.h:195
#3  insert (this=0x8470070, key=2, value=2) at /usr/include/cds/map/michael_hash_map.h:487
#4  Michael::put (this=0x8470070, key=2, value=2) at ../test/main.cpp:450
#5  0x0804b129 in FillTable (table_size=5033165) at ../test/main.cpp:876
#6  0x0804c7b2 in RunBenchmark () at ../test/main.cpp:961
#7  0x0804e617 in main (argc=9, argv=0xbffff714) at ../test/main.cpp:846

Answer 1

根据the docs，您看起来像missing the initialization of CDS and the threading manager：

#include <cds/threading/model.h>    // threading manager
#include <cds/gc/hzp/hzp.h>         // Hazard Pointer GC

// ...

int main()
{
    // Initialize CDS library
    cds::Initialize() ;

    // Initialize Garbage collector(s) that you use 
    cds::gc::hzp::GarbageCollector::Construct() ;

    // attach this thread to CDS:
    cds::threading::Manager::attachThread() ;

    // Do some useful work 

    Configuration _gConfiguration;
    TestDs* _gTestDs1 = new Michael(_gConfiguration);
    TestDs* _gTestDs2 = new CDSSplit(_gConfiguration);

    // Terminate GCs 
    cds::gc::hzp::GarbageCollector::Destruct() ;

    // Terminate CDS library
    cds::Terminate()    ;

    return 0;
}

LibCds：Michael Hashmap和Split Order List

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