#include <windows.h>
#include <stdio.h>
DWORD Sum; /* data is shared by the thread(s) */
/* the thread runs in this separate function */
DWORD WINAPI Summation (LPVOID Param)
{DWORD Upper = *(DWORD*)Param;
for (DWORD i = 0; i <= Upper; i++)
Sum += i;
return 0;
}
int main(int argc, char *argv[])
{DWORD ThreadId;
HANDLE ThreadHandle;
int Param;
if (argc != 2) {
fprintf(stderr, "An integer parameter is required\n");
return -1;
}
Param = atoi(argv[1]);
if (Param < 0) {
fprintf(stderr, "An integer >= 0 is required\n");
return -1;
}
/* create the thread */
ThreadHandle = CreateThread(
NULL, /* default security attributes */
0, /* default stack size */
Summation, /* thread function */
&Param, /* parameter to thread function */
0, /* default creation flags */
&ThreadId); /* returns the thread identifier */
if (ThreadHandle != NULL) /* now wait for the thread to finish */ {
WaitForSingleObject(ThreadHandle, INFINITE);
/* close the thread handle */
CloseHandle(ThreadHandle);
printf("sum = %d\n",Sum);
}
}
* Using system call "CreateThread ()" to create three threads:
1. Calculate the summation of n integers.
2. Calculate the multiplicative product of n integers.
3. Find all the primes within 1 to n.
N is a parameter input from the keyboard.
