Question

I dont know how can I make threads in C, i saw a review about pthread.h library but then i heard that its only for Linux OS, i have a function that its a timer, i want to created a thread with that function but i dont know either the library i need to use and syntax’s to write the code, if someone could provide me a simple code with threads, or tell me what things i need to put and the parameter of the functions.

Here its the function i create that countdown the specific time the user apply:
i need to make a thread with that function.

Function (Countdown):

#include <stdio.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>

void countdown(int second)
{
    int secs = 1;
    time_t unix;
    struct tm * timeinfo;
    time(&unix);
    timeinfo = localtime(&unix);
    int t1 = timeinfo->tm_sec;
    int t2 = timeinfo->tm_sec;
    int i = 0;

    while(1 == 1)
    {
       time(&unix);
       timeinfo = localtime(&unix);
       if((t1 + i)  == timeinfo->tm_sec)
       {
              system("cls");
              printf("Time left %d\n", timeinfo->tm_sec - t2 - second);
              i++;
       }
       if(timeinfo->tm_sec >= (t1 + second))
       {
           system("cls");
           puts("Your time its done");
           break;
       }

    }
}

int main()
{
    int limit;
    printf("How much time would you like (In secs): ");
    scanf("%d", &limit);
    countdown(limit);

    system("PAUSE");
    return 0;
}

Answer 1

Here is a simple guide to WinAPI threads:
http://www.cs.rpi.edu/academics/courses/netprog/WindowsThreads.html (Archived)

That being said, C is a minimalistic language, does not have built-in threading like Java (nor the enormous extra libraries). It was meant as a general language to build on top of it.

On Unix-like systems, there are system-wide standard C libraries beyond the ANSI/ISO standard, which are part of the POSIX standard, the pthreads are POSIX-threads.

Windows C libraries are MS makes things their own way. You can use frameworks that provide multi-OS support like GLib or Qt (Windows, Linux, other *nix). There are also ports and compatibility layers to use POSIX facilities inside windows. Cigwin gives you a full POSIX environment besides the libraries, The MinGW compiler allows you to use ports of POSIX functions on top of Win32 layers.

Frameworks like GLib and Qt are best to keep your code multi-platform, they hide the OS specifics, allowing a more general approach.

GLib is part of the GTK libraries for GUI development, and Qt is also a GUI development framework but in C++.