shmdata.h

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#ifndef VISTLE_SHMDATA_H
#define VISTLE_SHMDATA_H
 
#include <atomic>
#include <string>
#include <cassert>
 
#include "shmname.h"
 
namespace vistle {
 
struct ShmData {
    enum ShmType {
        INVALID,
        OBJECT,
        ARRAY,
    };
 
    explicit ShmData(ShmType t, const std::string &name = std::string()): name(name), m_refcount(0), shmtype(t) {}
 
    ~ShmData() { assert(m_refcount == 0); }
 
    int ref() const
    {
        assert(m_refcount >= 0);
        return ++m_refcount;
    }
 
    int unref() const
    {
        assert(m_refcount > 0);
        return --m_refcount;
    }
 
    int refcount() const
    {
        assert(m_refcount >= 0);
        return m_refcount;
    }
 
    const shm_name_t name;
    mutable std::atomic<int> m_refcount;
    const ShmType shmtype = INVALID;
};
 
} // namespace vistle
#endif