/*
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* =====================================================================================
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*
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* Filename: shm_queue.h
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*
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* Description:
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*
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* Version: 1.0
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* Created: 2021年03月25日 10时35分09秒
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* Revision: none
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* Compiler: gcc
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*
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* Author: Li Chao (),
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* Organization:
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*
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* =====================================================================================
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*/
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#ifndef SHM_QUEUE_JE0OEUP3
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#define SHM_QUEUE_JE0OEUP3
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#include "shm.h"
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#include "msg.h"
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#include <boost/circular_buffer.hpp>
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#include <boost/date_time/posix_time/posix_time.hpp>
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namespace bhome_shm {
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template <class D> using Circular = boost::circular_buffer<D, Allocator<D> >;
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typedef boost::uuids::uuid MQId;
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template <class D>
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class SharedQueue : private Circular<D>
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{
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typedef Circular<D> Super;
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Mutex mutex_;
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Cond cond_read_;
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Cond cond_write_;
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Mutex & mutex() { return mutex_; }
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static boost::posix_time::ptime MSFromNow(const int ms)
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{
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using namespace boost::posix_time;
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ptime cur = boost::posix_time::microsec_clock::universal_time();
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return cur + millisec(ms);
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}
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public:
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SharedQueue(const uint32_t len, Allocator<D> const& alloc):Super(len, alloc) {}
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using Super::size;
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using Super::capacity;
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template <class Iter, class OnWrite>
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int Write(Iter begin, Iter end, const int timeout_ms, const OnWrite &onWrite) {
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int n = 0;
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if (begin != end) {
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auto endtime = MSFromNow(timeout_ms);
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Guard lock(mutex());
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while (cond_write_.timed_wait(lock, endtime, [&]() { return !this->full(); })) {
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onWrite(*begin);
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this->push_back(*begin);
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++n;
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cond_read_.notify_one();
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if (++begin == end) {
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break;
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}
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}
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}
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return n;
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}
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template <class OnWrite>
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bool Write(const D &buf, const int timeout_ms, const OnWrite &onWrite) {
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return Write(&buf, (&buf)+1, timeout_ms, onWrite);
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}
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bool Write(const D &buf, const int timeout_ms) { return Write(buf, timeout_ms, [](const D &buf){}); }
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template <class OnData>
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bool Read(const int timeout_ms, OnData onData){
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int n = 0;
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auto endtime = MSFromNow(timeout_ms);
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Guard lock(mutex());
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while (cond_read_.timed_wait(lock, endtime, [&]() { return !this->empty(); })) {
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const bool more = onData(this->front());
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this->pop_front();
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cond_write_.notify_one();
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++n;
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if (!more) {
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break;
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}
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}
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return n;
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}
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bool Read(D &buf, const int timeout_ms){
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auto read1 = [&](D &d) {
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using std::swap;
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swap(buf, d);
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return false;
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};
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return Read(timeout_ms, read1) == 1;
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}
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};
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using namespace bhome_msg;
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class ShmMsgQueue : private ShmObject<SharedQueue<Msg> >
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{
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typedef ShmObject<SharedQueue<Msg> > Super;
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typedef Super::Data Queue;
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bool Write(const Msg &buf, const int timeout_ms) { return data()->Write(buf, timeout_ms); }
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bool Read(Msg &buf, const int timeout_ms) { return data()->Read(buf, timeout_ms); }
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MQId id_;
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protected:
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ShmMsgQueue(const std::string &raw_name, ShmType &segment, const int len); // internal use.
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public:
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ShmMsgQueue(const MQId &id, ShmType &segment, const int len);
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ShmMsgQueue(ShmType &segment, const int len);
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~ShmMsgQueue();
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bool Send(const MQId &remote_id, const void *data, const size_t size, const int timeout_ms);
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bool Recv(MQId &source_id, void *&data, size_t &size, const int timeout_ms);
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const MQId &Id() const { return id_; }
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bool Send(const MQId &remote_id, const Msg &msg, const int timeout_ms);
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bool Recv(Msg &msg, const int timeout_ms) { return Read(msg, timeout_ms); }
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};
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} // namespace bhome_shm
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#endif // end of include guard: SHM_QUEUE_JE0OEUP3
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