| | |
| | | #include <functional> |
| | | #include <stdint.h> |
| | | |
| | | class ShmSocket; |
| | | namespace bhome_msg |
| | | { |
| | | using namespace bhome_shm; |
| | |
| | | |
| | | class ShmMsg : private StaticDataRef<SharedMemory, ShmMsg> |
| | | { |
| | | private: |
| | | static inline SharedMemory &shm() { return GetData(); } |
| | | static ShmSocket &Sender(); |
| | | |
| | | // store ref count, msgs shareing the same data should also hold a pointer of the same RefCount object. |
| | | class RefCount : private boost::noncopyable |
| | | { |
| | |
| | | int Dec() { return --num_; } |
| | | int Get() { return num_.load(); } |
| | | }; |
| | | |
| | | typedef int64_t OffsetType; |
| | | static OffsetType Addr(void *ptr) { return reinterpret_cast<OffsetType>(ptr); } |
| | | static void *Ptr(const OffsetType offset) { return reinterpret_cast<void *>(offset); } |
| | |
| | | |
| | | static const uint32_t kMsgTag = 0xf1e2d3c4; |
| | | struct Meta { |
| | | static int64_t NewId() |
| | | { |
| | | static std::atomic<int64_t> id(0); |
| | | return ++id; |
| | | } |
| | | |
| | | RefCount count_; |
| | | const uint32_t tag_ = kMsgTag; |
| | | const uint32_t size_ = 0; |
| | | const int64_t id_ = 0; |
| | | std::atomic<int64_t> timestamp_; |
| | | Meta(uint32_t size) : |
| | | size_(size) {} |
| | | size_(size), id_(NewId()), timestamp_(NowSec()) {} |
| | | }; |
| | | OffsetType offset_; |
| | | void *Alloc(const size_t size) |
| | | static void *Alloc(const size_t size) |
| | | { |
| | | void *p = shm().Alloc(sizeof(Meta) + size); |
| | | if (p) { |
| | |
| | | } |
| | | return p; |
| | | } |
| | | void Free() |
| | | { |
| | | assert(valid()); |
| | | shm().Dealloc(meta()); |
| | | offset_ = 0; |
| | | assert(!valid()); |
| | | } |
| | | |
| | | private: |
| | | Meta *meta() const { return get<Meta>() - 1; } |
| | | |
| | | typedef std::function<void(void *p, int len)> ToArray; |
| | | void *Pack(const uint32_t head_len, const ToArray &headToArray, |
| | | const uint32_t body_len, const ToArray &bodyToArray) |
| | | |
| | | template <class Body> |
| | | void *Pack(const BHMsgHead &head, const uint32_t head_len, const Body &body, const uint32_t body_len) |
| | | { |
| | | void *addr = Alloc(sizeof(head_len) + head_len + sizeof(body_len) + body_len); |
| | | void *addr = get(); |
| | | if (addr) { |
| | | auto p = static_cast<char *>(addr); |
| | | auto Pack1 = [&p](auto len, auto &writer) { |
| | | auto Pack1 = [&p](auto len, auto &&writer) { |
| | | Put32(p, len); |
| | | p += sizeof(len); |
| | | writer(p, len); |
| | | p += len; |
| | | }; |
| | | Pack1(head_len, headToArray); |
| | | Pack1(body_len, bodyToArray); |
| | | Pack1(head_len, [&](void *p, int len) { head.SerializeToArray(p, len); }); |
| | | Pack1(body_len, [&](void *p, int len) { body.SerializeToArray(p, len); }); |
| | | } |
| | | return addr; |
| | | } |
| | | |
| | | template <class Body> |
| | | void *Pack(const BHMsgHead &head, const Body &body) |
| | | { |
| | | return Pack( |
| | | uint32_t(head.ByteSizeLong()), [&](void *p, int len) { head.SerializeToArray(p, len); }, |
| | | uint32_t(body.ByteSizeLong()), [&](void *p, int len) { body.SerializeToArray(p, len); }); |
| | | } |
| | | |
| | | void *Pack(const std::string &content) |
| | | { |
| | | void *addr = Alloc(content.size()); |
| | | void *addr = get(); |
| | | if (addr) { |
| | | memcpy(addr, content.data(), content.size()); |
| | | } |
| | |
| | | offset_(p ? (Addr(p) - BaseAddr()) : 0) {} |
| | | |
| | | template <class T = void> |
| | | T *get() const { return static_cast<T *>(Ptr(offset_ + BaseAddr())); } |
| | | T *get() const { return offset_ != 0 ? static_cast<T *>(Ptr(offset_ + BaseAddr())) : nullptr; } |
| | | |
| | | public: |
| | | static bool BindShm(SharedMemory &shm) { return SetData(shm); } |
| | | ShmMsg() : |
| | | ShmMsg(nullptr) {} |
| | | offset_(0) {} |
| | | explicit ShmMsg(const OffsetType offset) : |
| | | offset_(offset) {} |
| | | OffsetType Offset() const { return offset_; } |
| | | OffsetType &OffsetRef() { return offset_; } |
| | | void swap(ShmMsg &a) { std::swap(offset_, a.offset_); } |
| | | bool valid() const { return static_cast<bool>(offset_) && meta()->tag_ == kMsgTag; } |
| | | |
| | | int AddRef() const { return valid() ? meta()->count_.Inc() : 1; } |
| | | int Release() |
| | | { |
| | | if (!valid()) { |
| | | return 0; |
| | | } |
| | | auto n = meta()->count_.Dec(); |
| | | if (n == 0) { |
| | | Free(); |
| | | } |
| | | return n; |
| | | } |
| | | bool valid() const { return offset_ != 0 && meta()->tag_ == kMsgTag; } |
| | | int64_t id() const { return valid() ? meta()->id_ : 0; } |
| | | int64_t timestamp() const { return valid() ? meta()->timestamp_.load() : 0; } |
| | | size_t Size() const { return valid() ? meta()->size_ : 0; } |
| | | int Count() const { return valid() ? meta()->count_.Get() : 1; } |
| | | int AddRef() const { return valid() ? meta()->count_.Inc() : 1; } |
| | | int Release(); |
| | | void Free(); |
| | | |
| | | template <class Body> |
| | | inline bool Make(const BHMsgHead &head, const Body &body) { return Make(Pack(head, body)); } |
| | | inline bool Make(const std::string &content) { return Make(Pack(content)); } |
| | | inline bool Make(const BHMsgHead &head, const Body &body) |
| | | { |
| | | uint32_t head_len = head.ByteSizeLong(); |
| | | uint32_t body_len = body.ByteSizeLong(); |
| | | uint32_t size = sizeof(head_len) + head_len + sizeof(body_len) + body_len; |
| | | return Make(size) && Pack(head, head_len, body, body_len); |
| | | } |
| | | template <class Body> |
| | | inline bool Fill(const BHMsgHead &head, const Body &body) |
| | | { |
| | | uint32_t head_len = head.ByteSizeLong(); |
| | | uint32_t body_len = body.ByteSizeLong(); |
| | | uint32_t size = sizeof(head_len) + head_len + sizeof(body_len) + body_len; |
| | | return valid() && (meta()->size_ >= size) && Pack(head, head_len, body, body_len); |
| | | } |
| | | |
| | | inline bool Make(const std::string &content) { return Make(content.size()) && Pack(content); } |
| | | inline bool Fill(const std::string &content) { return valid() && (meta()->size_ >= content.size()) && Pack(content); } |
| | | |
| | | inline bool Make(const size_t size) { return Make(Alloc(size)); } |
| | | |
| | | template <class Body> |
| | | static inline std::string Serialize(const BHMsgHead &head, const Body &body) |
| | | { |
| | |
| | | |
| | | typedef ShmMsg MsgI; |
| | | |
| | | constexpr inline int EncodeCmd(int cmd) { return ((cmd & MaskBits(3)) << 1) | 1; } |
| | | constexpr inline int DecodeCmd(int64_t msg) { return (msg >> 1) & MaskBits(3); } |
| | | constexpr inline bool IsCmd(int64_t msg) { return (msg & 1) != 0; } |
| | | // int64_t pack format: cmd data ,3bit cmd, 1bit flag. |
| | | enum MsgCmd { |
| | | eCmdNodeInit = 0, // upto 59bit ssn id |
| | | eCmdNodeInitReply = 1, // 31bit proc index, |
| | | eCmdAllocRequest0 = 2, // 8bit size, 4bit socket index, 16bit proc index, 28bit id |
| | | eCmdAllocReply0 = 3, // 31bit ptr, 28bit id, |
| | | eCmdFree = 4, // upto 59bit msg id, |
| | | }; |
| | | |
| | | } // namespace bhome_msg |
| | | |
| | | #endif // end of include guard: MSG_5BILLZET |