| | |
| | | #ifndef SHM_QUEUE_JE0OEUP3 |
| | | #define SHM_QUEUE_JE0OEUP3 |
| | | |
| | | #include "msg.h" |
| | | #include "robust.h" |
| | | #include "shm.h" |
| | | #include <atomic> |
| | | #include <boost/circular_buffer.hpp> |
| | | #include <boost/date_time/posix_time/posix_time.hpp> |
| | | #include <chrono> |
| | | |
| | | namespace bhome_shm |
| | | { |
| | | |
| | | template <class D> |
| | | using Circular = boost::circular_buffer<D, Allocator<D>>; |
| | | |
| | | typedef boost::uuids::uuid MQId; |
| | | |
| | | template <class D> |
| | | class SharedQueue : private Circular<D> |
| | | // just wrap robust::AtomicQ63 |
| | | class SharedQ63 |
| | | { |
| | | typedef Circular<D> Super; |
| | | Mutex mutex_; |
| | | Cond cond_read_; |
| | | Cond cond_write_; |
| | | Mutex &mutex() { return mutex_; } |
| | | |
| | | static boost::posix_time::ptime MSFromNow(const int ms) |
| | | { |
| | | using namespace boost::posix_time; |
| | | ptime cur = boost::posix_time::microsec_clock::universal_time(); |
| | | return cur + millisec(ms); |
| | | } |
| | | |
| | | public: |
| | | SharedQueue(const uint32_t len, Allocator<D> const &alloc) : |
| | | Super(len, alloc) {} |
| | | using Super::capacity; |
| | | using Super::size; |
| | | template <class Iter, class OnWrite> |
| | | int Write(Iter begin, Iter end, const int timeout_ms, const OnWrite &onWrite) |
| | | { |
| | | int n = 0; |
| | | if (begin != end) { |
| | | auto endtime = MSFromNow(timeout_ms); |
| | | Guard lock(mutex()); |
| | | while (cond_write_.timed_wait(lock, endtime, [&]() { return !this->full(); })) { |
| | | onWrite(*begin); |
| | | this->push_back(*begin); |
| | | ++n; |
| | | cond_read_.notify_one(); |
| | | if (++begin == end) { |
| | | break; |
| | | } |
| | | } |
| | | } |
| | | return n; |
| | | } |
| | | template <class... T> |
| | | explicit SharedQ63(T &&...t) {} // easy testing |
| | | |
| | | template <class OnWrite> |
| | | bool Write(const D &buf, const int timeout_ms, const OnWrite &onWrite) |
| | | { |
| | | return Write(&buf, (&buf) + 1, timeout_ms, onWrite); |
| | | } |
| | | bool Write(const D &buf, const int timeout_ms) |
| | | { |
| | | return Write(buf, timeout_ms, [](const D &buf) {}); |
| | | } |
| | | typedef robust::AtomicQ63 AQ63; |
| | | typedef AQ63::Data Data; |
| | | bool TryRead(Data &d, const bool try_more = true) { return queue_.pop(d, try_more); } |
| | | bool TryWrite(const Data d, const bool try_more = true) { return queue_.push(d, try_more); } |
| | | |
| | | template <class OnData> |
| | | bool Read(const int timeout_ms, OnData onData) |
| | | { |
| | | int n = 0; |
| | | auto endtime = MSFromNow(timeout_ms); |
| | | Guard lock(mutex()); |
| | | while (cond_read_.timed_wait(lock, endtime, [&]() { return !this->empty(); })) { |
| | | const bool more = onData(this->front()); |
| | | this->pop_front(); |
| | | cond_write_.notify_one(); |
| | | ++n; |
| | | if (!more) { |
| | | break; |
| | | } |
| | | } |
| | | return n; |
| | | } |
| | | |
| | | bool Read(D &buf, const int timeout_ms) |
| | | { |
| | | auto read1 = [&](D &d) { |
| | | using std::swap; |
| | | swap(buf, d); |
| | | return false; |
| | | }; |
| | | return Read(timeout_ms, read1) == 1; |
| | | } |
| | | }; |
| | | |
| | | using namespace bhome_msg; |
| | | |
| | | class ShmMsgQueue : private ShmObject<SharedQueue<MsgI>> |
| | | { |
| | | typedef ShmObject<SharedQueue<MsgI>> Super; |
| | | typedef Super::Data Queue; |
| | | bool Write(const MsgI &buf, const int timeout_ms) { return data()->Write(buf, timeout_ms); } |
| | | bool Read(MsgI &buf, const int timeout_ms) { return data()->Read(buf, timeout_ms); } |
| | | MQId id_; |
| | | |
| | | protected: |
| | | ShmMsgQueue(const std::string &raw_name, ShmType &segment, const int len); // internal use. |
| | | public: |
| | | ShmMsgQueue(const MQId &id, ShmType &segment, const int len); |
| | | ShmMsgQueue(ShmType &segment, const int len); |
| | | ~ShmMsgQueue(); |
| | | const MQId &Id() const { return id_; } |
| | | |
| | | bool Recv(BHMsg &msg, const int timeout_ms); |
| | | bool Recv(MsgI &msg, const int timeout_ms) { return Read(msg, timeout_ms); } |
| | | bool Send(const MQId &remote_id, const BHMsg &msg, const int timeout_ms); |
| | | static bool Send(SharedMemory &shm, const MQId &remote_id, const MsgI &msg, const int timeout_ms); |
| | | bool Send(const MQId &remote_id, const MsgI &msg, const int timeout_ms) |
| | | { |
| | | return Send(shm(), remote_id, msg, timeout_ms); |
| | | } |
| | | size_t Pending() const { return data()->size(); } |
| | | private: |
| | | AQ63 queue_; |
| | | }; |
| | | |
| | | } // namespace bhome_shm |