| | |
| | | #define SHM_6CHO6D6C |
| | | |
| | | #include <boost/interprocess/managed_shared_memory.hpp> |
| | | #include <boost/interprocess/sync/interprocess_condition.hpp> |
| | | #include <boost/interprocess/sync/interprocess_mutex.hpp> |
| | | #include <boost/interprocess/sync/scoped_lock.hpp> |
| | | #include <boost/noncopyable.hpp> |
| | | #include <boost/uuid/uuid.hpp> |
| | | #include <string> |
| | | |
| | | namespace bhome_shm |
| | | { |
| | |
| | | typedef managed_shared_memory mshm_t; |
| | | typedef interprocess_mutex Mutex; |
| | | typedef scoped_lock<Mutex> Guard; |
| | | typedef interprocess_condition Cond; |
| | | |
| | | class SharedMemory : public mshm_t |
| | | { |
| | | std::string name_; |
| | | Mutex *pmutex_ = 0; |
| | | |
| | | static permissions AllowAll() |
| | | { |
| | |
| | | ~SharedMemory(); |
| | | std::string name() const { return name_; } |
| | | bool Remove() { return Remove(name()); } |
| | | template <class T, class... Params> |
| | | T *FindOrCreate(const std::string &name, Params &&...params) |
| | | { |
| | | return find_or_construct<T>(name.c_str(), std::nothrow)(std::forward<decltype(params)>(params)...); |
| | | } |
| | | template <class T, class... Params> |
| | | T *Create(const std::string &name, Params &&...params) |
| | | { |
| | | return construct<T>(name.c_str(), std::nothrow)(std::forward<decltype(params)>(params)...); |
| | | } |
| | | template <class T> |
| | | bool Destroy(const std::string &name) { return destroy<T>(name.c_str()); } |
| | | |
| | | void *Alloc(const size_t size) { return allocate(size, std::nothrow); } |
| | | void *Alloc(const size_t size) |
| | | { |
| | | Guard lock(*pmutex_); |
| | | return allocate(size, std::nothrow); |
| | | } |
| | | void Dealloc(void *p) |
| | | { |
| | | Guard lock(*pmutex_); |
| | | if (p) { deallocate(p); } |
| | | } |
| | | template <class T> |
| | | void Dealloc(offset_ptr<T> ptr) { return Dealloc(ptr.get()); } |
| | | |
| | | template <class T, class... Params> |
| | | T *New(Params const &...params) { return construct<T>(anonymous_instance, std::nothrow)(params...); } |
| | | template <class T> |
| | | void Delete(T *p) |
| | | { |
| | | if (p) { destroy_ptr<T>(p); }; |
| | | } |
| | | template <class T> |
| | | void Delete(offset_ptr<T> p) { Delete(p.get()); } |
| | | template <class T> |
| | | T *Find(const std::string &name) { return find<T>(name.c_str()).first; } |
| | | }; |
| | | |
| | | template <class D> |
| | | using Allocator = allocator<D, SharedMemory::segment_manager>; |
| | | template <class D> |
| | | using Deleter = deleter<D, SharedMemory::segment_manager>; |
| | | template <class D> |
| | | using SharedPtr = shared_ptr<D, Allocator<void>, Deleter<D>>; |
| | | enum Mode { |
| | | eOpen = 0, |
| | | eCreate = 1, |
| | | eOpenOrCreate = 2 |
| | | }; |
| | | |
| | | // ShmObject manages an object in shared memory, but ShmObject itself is not in shared memory. |
| | | // NamedShmObject manages an object in shared memory, but NamedShmObject itself is not in shared memory. |
| | | template <class T> |
| | | class ShmObject : private boost::noncopyable |
| | | class NamedShmObject : private boost::noncopyable |
| | | { |
| | | static std::string ObjName(const std::string &name) { return "obj" + name; } |
| | | |
| | | protected: |
| | | public: |
| | | typedef T Data; |
| | | typedef SharedMemory ShmType; |
| | | ShmType &shm() const { return shm_; } |
| | | |
| | | private: |
| | | ShmType &shm_; |
| | | std::string name_; |
| | | Data *pdata_ = nullptr; |
| | | template <class... Params> |
| | | NamedShmObject(ShmType &segment, const std::string &name, Mode mode, Params &&...t) : |
| | | shm_(segment), name_(name) |
| | | { |
| | | switch (mode) { |
| | | case eOpen: |
| | | pdata_ = shm_.Find<Data>(ObjName(name_)); |
| | | break; |
| | | case eCreate: |
| | | pdata_ = shm_.Create<Data>(ObjName(name_), std::forward<decltype(t)>(t)...); |
| | | break; |
| | | case eOpenOrCreate: |
| | | pdata_ = shm_.FindOrCreate<Data>(ObjName(name_), std::forward<decltype(t)>(t)...); |
| | | break; |
| | | default: break; |
| | | } |
| | | if (!IsOk()) { |
| | | throw std::runtime_error("Error: shm can not create/open \"" + name_ + "\""); |
| | | } |
| | | } |
| | | |
| | | NamedShmObject(const int64_t offset, ShmType &segment, const std::string &name) : |
| | | shm_(segment), name_(name) |
| | | { |
| | | pdata_ = reinterpret_cast<Data *>(Addr(shm_.get_address()) + offset); |
| | | } |
| | | |
| | | bool IsOk() const { return pdata_; } |
| | | |
| | | protected: |
| | | ShmType &shm() const { return shm_; } |
| | | |
| | | public: |
| | | template <class... Params> |
| | | ShmObject(ShmType &segment, const std::string &name, Params &&...t) : |
| | | shm_(segment), name_(name) |
| | | { |
| | | pdata_ = shm_.find_or_construct<Data>(ObjName(name_).c_str(), std::nothrow)(t...); |
| | | if (!IsOk()) { |
| | | throw("Error: Not enough memory, can not allocate \"" + name_ + "\""); |
| | | } |
| | | } |
| | | static bool Remove(SharedMemory &shm, const std::string &name) { return shm.Destroy<Data>(ObjName(name)); } |
| | | static Data *Find(SharedMemory &shm, const std::string &name) { return shm.Find<Data>(ObjName(name)); } |
| | | Data *Find(const std::string &name) { return Find(shm_, ObjName(name)); } |
| | | virtual ~ShmObject() {} |
| | | virtual ~NamedShmObject() {} |
| | | std::string name() const { return name_; } |
| | | Data *data() { return pdata_; } |
| | | const Data *data() const { return pdata_; } |
| | | int64_t offset() const { return Addr(pdata_) - Addr(shm_.get_address()); } |
| | | Data *operator->() { return data(); } |
| | | const Data *operator->() const { return data(); } |
| | | bool Remove() { return shm_.destroy<Data>(ObjName(name_).c_str()); } |
| | | bool Remove() { return Remove(shm_, name_); } |
| | | |
| | | private: |
| | | static int64_t Addr(const void *p) { return reinterpret_cast<int64_t>(p); } |
| | | ShmType &shm_; |
| | | std::string name_; |
| | | Data *pdata_ = nullptr; |
| | | }; |
| | | |
| | | } // namespace bhome_shm |