boost 线程安全队列

时间：2015-02-16 19:35:17 阅读：570 评论：0 收藏：0 [点我收藏+]

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thread null methods processing object signal

[cpp] view plain copy

// QueueImplementation.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <windows.h>
#include <iostream>
#include <queue>
#include <string>
#include <process.h>
using namespace std;
struct DataBlock
{
string m_szText; //sample data
};
class CDataQueue
{
private:
queue<DataBlock> m_oQueue; //contains the actual data
CRITICAL_SECTION m_csData; //to synchroize access to m_csData among multiple threads
HANDLE m_hEvent; //for signalling presence of absence of data
public:
//create a manual reset event initially signalled.
//This event will be signalled and shall remain so whenever there is data in the queue and
//it shall be reset as long as queue is empty
CDataQueue()
{
InitializeCriticalSection(&m_csData);
m_hEvent = CreateEvent(NULL,TRUE,FALSE,NULL);
};
//close the event handle
~CDataQueue()
{
DeleteCriticalSection(&m_csData);
CloseHandle(m_hEvent);
};
//public methods to Push data to queue
void Push(DataBlock& oNewData)
{
EnterCriticalSection(&m_csData);
//push new element to queue
m_oQueue.push(oNewData);
//now that there is atleast one element, set the event
SetEvent(m_hEvent);
LeaveCriticalSection(&m_csData);
};
//public methods to Pop data from queue
DataBlock Pop()
{
EnterCriticalSection(&m_csData);
//first get the topmost data block
DataBlock popData = m_oQueue.front();
//next remove it from queue
m_oQueue.pop();
//now, check for new size.. if no more elements in queue
//reset the event
if(!m_oQueue.size())
ResetEvent(m_hEvent);
LeaveCriticalSection(&m_csData);
return popData;
};
//helper method to get the event handle
HANDLE GetEvent(){return m_hEvent;};
};
CDataQueue g_oQueue;
HANDLE g_hExitEvent;
unsigned __stdcall ProcessData (void * )
{
HANDLE hEvents[] = { g_hExitEvent, g_oQueue.GetEvent()};
DWORD dwRet;
BOOL bContinue = TRUE;
while(bContinue)
{
dwRet = WaitForMultipleObjects(sizeof(hEvents)/sizeof(hEvents[0]),hEvents,FALSE,INFINITE);
switch(dwRet)
{
case WAIT_OBJECT_0 :
{
//exit signalled.. time to quit the thread
bContinue = FALSE;
}
break;
case WAIT_OBJECT_0 + 1:
{
//some data got..
DataBlock oData = g_oQueue.Pop();
//echo data to screen
cout << "Data typed in is .. " << oData.m_szText << "/n";
}
break;
default:break;
}
}
return 0;
}
int main(int argc, char* argv[])
{
DWORD dwThreadID = 0;
HANDLE hThread = NULL;
//create an event to signal worker thread to exit
g_hExitEvent = CreateEvent(NULL,TRUE,FALSE,NULL);//not signalled initially..
//spawn a thread for processing the input
hThread = (HANDLE)_beginthreadex(NULL,0,ProcessData,NULL,0,(unsigned int *)&dwThreadID);
if(hThread)
{
cout << "enter sentence to process /nOR /nenter /"exit/" to quit/n";
do
{
DataBlock oData;
cin >> oData.m_szText;
//if exit typed in.. quit
if(0 == oData.m_szText.compare("exit"))
break;
g_oQueue.Push(oData);
}
while(1);
//time to close ..set the exit event
SetEvent(g_hExitEvent);
//wait for worker thread to close
WaitForSingleObject(hThread,INFINITE);
//close the thread handle
CloseHandle(hThread);
}
CloseHandle(g_hExitEvent);
return 0;
}

[cpp] view plain copy

template<typename Data>
class concurrent_queue
{
private:
std::queue<Data> the_queue;
mutable boost::mutex the_mutex;
boost::condition_variable the_condition_variable;
public:
void push(Data const& data)
{
boost::mutex::scoped_lock lock(the_mutex);
the_queue.push(data);
lock.unlock();
the_condition_variable.notify_one();
}
bool empty() const
{
boost::mutex::scoped_lock lock(the_mutex);
return the_queue.empty();
}
bool try_pop(Data& popped_value)
{
boost::mutex::scoped_lock lock(the_mutex);
if(the_queue.empty())
{
return false;
}
popped_value=the_queue.front();
the_queue.pop();
return true;
}
void wait_and_pop(Data& popped_value)
{
boost::mutex::scoped_lock lock(the_mutex);
while(the_queue.empty())
{
the_condition_variable.wait(lock);
}
popped_value=the_queue.front();
the_queue.pop();
}
};

boost 线程安全队列

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原文地址：http://www.cnblogs.com/rainbowzc/p/4294452.html

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