/*
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* =====================================================================================
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*
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* Filename: shm.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22日 16时19分21秒
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* Revision: none
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* Compiler: gcc
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*
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* Author: LiChao (),
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* Organization:
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*
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* =====================================================================================
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*/
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#ifndef SHM_6CHO6D6C
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#define SHM_6CHO6D6C
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#include <boost/interprocess/managed_shared_memory.hpp>
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#include <boost/interprocess/sync/interprocess_condition.hpp>
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#include <boost/circular_buffer.hpp>
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#include <boost/noncopyable.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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using namespace boost::interprocess;
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typedef managed_shared_memory mshm_t;
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typedef interprocess_mutex Mutex;
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typedef scoped_lock<Mutex> Guard;
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typedef interprocess_condition Cond;
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class SharedMemory : public mshm_t
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{
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std::string name_;
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static permissions AllowAll() {
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permissions perm;
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perm.set_unrestricted();
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return perm;
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}
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public:
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static bool Remove(const std::string &name) {
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return shared_memory_object::remove(name.c_str());
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}
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SharedMemory(const std::string &name, const uint64_t size):
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mshm_t(open_or_create, name.c_str(), size, 0, AllowAll()),
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name_(name)
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{}
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std::string name() const { return name_; }
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bool Remove() { return Remove(name()); }
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template <class T, class ...Params> T * New(Params const&...params) { return construct<T, std::nothrow>(anonymous_instance)(params...); }
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template <class T> void Delete(T *p) { if (p) { destroy_ptr<T>(p); }; }
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template <class T> void Delete(offset_ptr<T> p) { Delete(p.get()); }
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};
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// ShmObject manages an object in shared memory, but ShmObject itself is not in shared memory.
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// works like a smart pointer of an object in shared memory.
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template <class T>
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class ShmObject : private boost::noncopyable {
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static std::string DataName(const std::string &name) { return "dat" + name; }
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protected:
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typedef T Data;
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typedef SharedMemory ShmType;
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private:
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ShmType &shm_;
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std::string name_;
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Data *pdata_ = nullptr;
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bool IsOk() const { return pdata_; }
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protected:
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ShmType &shm() { return shm_; }
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public:
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template <class...Params>
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ShmObject(ShmType &segment, const std::string &name, Params&&...t):
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shm_(segment), name_(name)
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{
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pdata_ = shm_.find_or_construct<Data>(DataName(name_).c_str())(t...);
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if (!IsOk()) {
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throw("shm error: " + name_);
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}
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}
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Data *find(const std::string &name) { return shm_.find<Data>(DataName(name).c_str()).first; }
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virtual ~ShmObject() {}
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std::string name() const { return name_; }
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Data* data() { return pdata_; }
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const Data* data() const { return pdata_; }
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Data* operator->() { return data(); }
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const Data* operator->() const { return data(); }
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virtual bool Remove() { return shm_.destroy<Data>(DataName(name_).c_str()); }
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};
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template <class D> using Allocator = allocator<D, mshm_t::segment_manager>;
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template <class D> using Circular = boost::circular_buffer<D, Allocator<D> >;
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typedef int MQId;
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template <class D>
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class SyncedQueue : 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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const MQId id_;
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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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template <class...T> SyncedQueue(MQId id, T&&...t):Super(t...), id_(id) {}
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using Super::size;
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using Super::capacity;
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MQId id() const { return id_; }
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bool Write(D buf, const int timeout_ms) {
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Guard lock(mutex());
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if (cond_write_.timed_wait(lock, MSFromNow(timeout_ms), [&]() { return !this->full(); })) {
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this->push_back(buf);
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cond_read_.notify_one();
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return true;
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} else {
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return false;
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}
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}
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bool Read(D &buf, const int timeout_ms){
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Guard lock(mutex());
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if (cond_read_.timed_wait(lock, MSFromNow(timeout_ms), [&]() { return !this->empty(); })) {
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buf = this->front();
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this->pop_front();
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cond_write_.notify_one();
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return true;
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} else {
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return false;
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}
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}
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};
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// safe to be stored in shared memory.
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struct Msg {
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MQId src_;
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offset_ptr<void> data_;
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size_t size_;
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};
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class ShmMsgQueue : private ShmObject<SyncedQueue<Msg> >
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{
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typedef ShmObject<SyncedQueue<Msg> > SharedQueue;
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typedef SharedQueue::Data Queue;
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ShmMsgQueue(MQId id, ShmType &segment, const std::string &name, const uint32_t len);
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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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public:
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ShmMsgQueue(MQId id, ShmType &segment, const uint32_t len);
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~ShmMsgQueue();
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bool Send(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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using SharedQueue::Remove;
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MQId id() const { return data()->id(); }
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};
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} // namespace bhome_shm
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#endif // end of include guard: SHM_6CHO6D6C
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