Re: WaitForSingleObject

"Larry" <>
Thu, 28 Jan 2010 18:50:16 +0100
"Ulrich Eckhardt" <> ha scritto nel messaggio

Sorry, but both wraps are wrong. You have to initialise the critical
sections on startup and delete them when you don't need them any more
before main() returns). In between, you can use them, e.g. you have to
one (EnterCriticalSection) whenever you want to access (read or write) the
shared data it guards. Then, when you're done, you unlock it again
(LeaveCriticalSection), so other threads can access the data.

I tried that, but it is not working like I was expecting...I still get a run
time error when I disconnect from the server (I'm using telnet)

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#include <iostream>
#include <string>
#include <map>
#include <algorithm>
#include <process.h>
#include <cstdlib>
#include <ctime>
#include "socket.h"
#include <boost/circular_buffer.hpp>
using namespace std;
using namespace boost;

const string CRLF = "\r\n";
const int numbuff = 3;

unsigned int __stdcall Consumer(void* sock);
unsigned int __stdcall Producer(void*);

void getDateTime(char * szTime);

enum buffer_status

struct buffer
 unsigned char data[1024];
 int bytesRecorded;
 int flag;
 buffer(const unsigned char * data_, const int bytesRecorded_, const int
flag_) :
  bytesRecorded(bytesRecorded_), flag(flag_)
   copy(data_, data_ + bytesRecorded_, data);

struct circular
 circular_buffer<buffer> cb;

// Global maps

map<int, circular> users;
map<int, circular>::iterator uit;
map<int, HANDLE> eventi;
map<int, HANDLE>::iterator eit;

// Declare Procuder && Cosumer CS


int main()
 // Initialize the critical section

 // Launch Producer Thread
 unsigned int prodRet;
  cout << "Launched Producer Thread!" << endl;

 // Server.
 // Set up server (port: 8000, maxconn: 10)
 SocketServer sockIn(8000, 10);

  // ...wait for incoming connections...
  Socket* s = sockIn.Accept();

  // Initialize the critical section

  // Spawn a new Consumr Thread each
  // time a client connects.
  unsigned int sockRet;
   cout << "Spawned a new thread!" << endl;




// Consumer Thread
unsigned int __stdcall Consumer(void* sock)
 Socket* s = (Socket*) sock;

 s->SendBytes("Hello World!" + CRLF);

 int threadid = (int)GetCurrentThreadId();

 // Create Event && Push it in the event map
 HANDLE hevent = CreateEvent(NULL,FALSE,FALSE,NULL);


 // Prepare && Add circular buffer to the map
 circular c;

 for(int i = 0; i<numbuff; i++)

 users.insert(make_pair(threadid, c));

 // Read data from the buffer
 // and send it to the client
 // When using push_back the oldest
 // element in the circular buffer
 // will be in the index 0


   WaitForSingleObject(eventi[threadid], INFINITE);
  } else {
   return 0;

  if(users[threadid] == BUFF_DONE)
   string line = (char*)users[threadid];
   int ret = s->SendBytes(line + CRLF);
   if(SOCKET_ERROR == ret)

 // Close & remove event from event map


 // Remove buffer from the map

 // Say bye to the client
 s->SendBytes("Bye bye!" + CRLF);

 // Disconnect client
 cout << "Closing thread..." << endl;

 // Release resources used by the critical section object.
 delete s;
 return 0;

// Producer Thread
unsigned int __stdcall Producer(void*)
  char szTime[30]; getDateTime(szTime);

  // Request ownership of the critical section.

  for(uit=users.begin(); uit!=users.end(); ++uit)
   users[uit->first].cb.push_back(buffer((unsigned char*)szTime, 30,


   cout << "Producer is writing to: " << uit->first << endl;

  // Release ownership of the critical section.
 // Release resources used by the critical section object.
 return 0;

void getDateTime(char * szTime)
 time_t rawtime = time(NULL);
 struct tm timeinfo;
 gmtime_s(&timeinfo, &rawtime);
 strftime(szTime, 30, "%a, %d %b %Y %X GMT", &timeinfo);

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