/*
|
* =====================================================================================
|
*
|
* Filename: shm_queue.h
|
*
|
* Description:
|
*
|
* Version: 1.0
|
* Created: 2021年03月25日 10时35分09秒
|
* Revision: none
|
* Compiler: gcc
|
*
|
* Author: Li Chao (),
|
* Organization:
|
*
|
* =====================================================================================
|
*/
|
|
#ifndef SHM_QUEUE_JE0OEUP3
|
#define SHM_QUEUE_JE0OEUP3
|
|
#include "shm.h"
|
#include <atomic>
|
#include <boost/circular_buffer.hpp>
|
#include <boost/date_time/posix_time/posix_time.hpp>
|
|
namespace bhome_shm
|
{
|
|
template <class D>
|
using Circular = boost::circular_buffer<D, Allocator<D>>;
|
|
template <class D>
|
class SharedQueue : private Circular<D>
|
{
|
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);
|
}
|
|
auto TimedReadPred(const int timeout_ms)
|
{
|
auto endtime = MSFromNow(timeout_ms);
|
return [this, endtime](Guard &lock) {
|
return (cond_read_.timed_wait(lock, endtime, [&]() { return !this->empty(); }));
|
};
|
}
|
auto TryReadPred()
|
{
|
return [this](Guard &lock) { return !this->empty(); };
|
}
|
|
template <class Pred>
|
bool ReadOnCond(D &buf, Pred const &pred)
|
{
|
auto Read = [&]() {
|
Guard lock(this->mutex());
|
if (pred(lock)) {
|
using std::swap;
|
swap(buf, Super::front());
|
Super::pop_front();
|
return true;
|
} else {
|
return false;
|
}
|
};
|
return Read() ? (this->cond_write_.notify_one(), true) : false;
|
}
|
|
template <class Iter, class Pred, class OnWrite>
|
int WriteAllOnCond(Iter begin, Iter end, Pred const &pred, OnWrite const &onWrite)
|
{
|
if (begin == end) { return 0; }
|
|
int n = 0;
|
Guard lock(mutex());
|
while (pred(lock)) {
|
onWrite(*begin);
|
Super::push_back(*begin);
|
++n;
|
cond_read_.notify_one();
|
if (++begin == end) {
|
break;
|
}
|
}
|
return n;
|
}
|
|
public:
|
SharedQueue(const uint32_t len, Allocator<D> const &alloc) :
|
Super(len, alloc) {}
|
|
template <class Iter, class OnWrite>
|
int TryWrite(Iter begin, Iter end, const OnWrite &onWrite)
|
{
|
auto tryWritePred = [this](Guard &lock) { return !this->full(); };
|
return WriteAllOnCond(begin, end, tryWritePred, onWrite);
|
}
|
|
template <class OnWrite>
|
bool TryWrite(const D &buf, const OnWrite &onWrite) { return TryWrite(&buf, (&buf) + 1, onWrite); }
|
|
bool TryWrite(const D &buf)
|
{
|
return TryWrite(buf, [](const D &buf) {});
|
}
|
|
template <class OnData>
|
int ReadAll(const int timeout_ms, OnData const &onData) { return ReadAllOnCond(TimedReadPred(timeout_ms), onData); }
|
template <class OnData>
|
int TryReadAll(OnData const &onData) { return ReadAllOnCond(TryReadPred(), onData); }
|
|
bool Read(D &buf, const int timeout_ms) { return ReadOnCond(buf, TimedReadPred(timeout_ms)); }
|
bool TryRead(D &buf) { return ReadOnCond(buf, TryReadPred()); }
|
};
|
|
} // namespace bhome_shm
|
|
#endif // end of include guard: SHM_QUEUE_JE0OEUP3
|
