i2pd/Queue.h
2014-04-23 12:49:02 -04:00

147 lines
2.6 KiB
C++

#ifndef QUEUE_H__
#define QUEUE_H__
#include <queue>
#include <mutex>
#include <thread>
#include <condition_variable>
#include <functional>
namespace i2p
{
namespace util
{
template<typename Element>
class Queue
{
public:
void Put (Element * e)
{
std::unique_lock<std::mutex> l(m_QueueMutex);
m_Queue.push (e);
m_NonEmpty.notify_one ();
}
Element * GetNext ()
{
std::unique_lock<std::mutex> l(m_QueueMutex);
Element * el = GetNonThreadSafe ();
if (!el)
{
m_NonEmpty.wait (l);
el = GetNonThreadSafe ();
}
return el;
}
Element * GetNextWithTimeout (int usec)
{
std::unique_lock<std::mutex> l(m_QueueMutex);
Element * el = GetNonThreadSafe ();
if (!el)
{
m_NonEmpty.wait_for (l, std::chrono::milliseconds (usec));
el = GetNonThreadSafe ();
}
return el;
}
void Wait ()
{
std::unique_lock<std::mutex> l(m_QueueMutex);
m_NonEmpty.wait (l);
}
bool Wait (int sec, int usec)
{
std::unique_lock<std::mutex> l(m_QueueMutex);
return m_NonEmpty.wait_for (l, std::chrono::seconds (sec) + std::chrono::milliseconds (usec)) != std::cv_status::timeout;
}
bool IsEmpty ()
{
std::unique_lock<std::mutex> l(m_QueueMutex);
return m_Queue.empty ();
}
void WakeUp () { m_NonEmpty.notify_one (); };
Element * Get ()
{
std::unique_lock<std::mutex> l(m_QueueMutex);
return GetNonThreadSafe ();
}
Element * Peek ()
{
std::unique_lock<std::mutex> l(m_QueueMutex);
return GetNonThreadSafe (true);
}
private:
Element * GetNonThreadSafe (bool peek = false)
{
if (!m_Queue.empty ())
{
Element * el = m_Queue.front ();
if (!peek)
m_Queue.pop ();
return el;
}
return nullptr;
}
private:
std::queue<Element *> m_Queue;
std::mutex m_QueueMutex;
std::condition_variable m_NonEmpty;
};
template<class Msg>
class MsgQueue: public Queue<Msg>
{
public:
typedef std::function<void()> OnEmpty;
MsgQueue (): m_IsRunning (true), m_Thread (std::bind (&MsgQueue<Msg>::Run, this)) {};
void Stop()
{
m_IsRunning = false;
Queue<Msg>::WakeUp ();
m_Thread.join();
}
void SetOnEmpty (OnEmpty const & e) { m_OnEmpty = e; };
private:
void Run ()
{
while (m_IsRunning)
{
while (Msg * msg = Queue<Msg>::Get ())
{
msg->Process ();
delete msg;
}
if (m_OnEmpty != nullptr)
m_OnEmpty ();
Queue<Msg>::Wait ();
}
}
private:
bool m_IsRunning;
std::thread m_Thread;
OnEmpty m_OnEmpty;
};
}
}
#endif