Parallel Tasks

[Guluck]

Hi everybody,

I'm creating a program with Microsoft Visual Studio 2010, it's a console program. My computer is running on XP.

The program created can take pictures with 5 cameras.
But the cameras, one by one, take a picture so it's not simultaneous.

And I have to do a program which take five images of a same time, the five cameras take a photo at the same time.
So i would like program parallel tasks, but i really dont know how to do that.
Can you help me ? Show me examples ?
If you need more informations, ask me !

Thanks, and sorry for the mistakes my english is not really good.

[kbw]

#define _CRT_SECURE_NO_WARNINGS

#include <windows.h>
#include <process.h>
#include <stdio.h>

struct ThreadInfo
{
	ThreadInfo();
	~ThreadInfo();

	HANDLE	fire;
	HANDLE	stop;

private:
	ThreadInfo(const ThreadInfo &);
	ThreadInfo& operator=(const ThreadInfo &);
};

ThreadInfo::ThreadInfo()
{
	fire = CreateEvent(0, FALSE, FALSE, NULL);
	stop = CreateEvent(0, TRUE, FALSE, NULL);
}

ThreadInfo::~ThreadInfo()
{
	CloseHandle(stop);
	CloseHandle(fire);
}

unsigned __stdcall threadfunc(void* param)
{
	if (ThreadInfo* info = reinterpret_cast<ThreadInfo*>(param))
	{
		char buf[32];

		for (;;)
		{
			HANDLE h[2] = { info->fire, info->stop };
			DWORD ret = WaitForMultipleObjects(2, h, FALSE, INFINITE);
			if (ret == WAIT_OBJECT_0)
			{
				_snprintf(buf, sizeof(buf), "Thread %ld fired\n", GetCurrentThreadId());
				printf(buf);
			}
			else if (ret == WAIT_OBJECT_0+1)
			{
				_snprintf(buf, sizeof(buf), "Thread %ld clean shutdown\n", GetCurrentThreadId());
				printf(buf);
				break;
			}
			else
			{
				_snprintf(buf, sizeof(buf), "Thread %ld abnormal shutdown\n", GetCurrentThreadId());
				printf(buf);
				break;
			}
		}
	}
	return 0;
}

int main()
{
	const size_t N = 5;
	ThreadInfo info[N];
	HANDLE h[N];

	for (size_t i = 0; i != N; ++i)
	{
		unsigned threadid;
		h[i] = (HANDLE)_beginthreadex(0, 0, threadfunc, &info[i], 0, &threadid);
	}
	Sleep(5*1000);

	for (size_t i = 0; i != N; ++i)
		SetEvent(info[i].fire);
	Sleep(5*1000);

	for (size_t i = 0; i != N; ++i)
		SetEvent(info[i].stop);
	Sleep(5*1000);

	return 0;
}

[Guluck]

Thanks a lot !