Is there any additional changes do I need to do for Linux platform for thread creation when using for both Windows and Linux platforms using C++?

I am creating a thread in the library for different platforms using #ifdef and calling it from the main application like as shown in the below code snippet:

When I compile the code it is working for windows platform. I also wrote the code to support for Linux platform as that will be useful when we run the code in the Linux platform.

But I wanted to know, is my syntax of "pthread_create" is correct?

And also can I pass the same thread function (mythread function I am passing to CreateThread function) as a parameter to "pthread_create" also?

Is there any additional changes do I need to do to use the thread creation for Linux platform also?

Library code (mydll):

MyDLL.h

#ifdef MYDLL_EXPORTS
#define THREADDLL_API __declspec(dllexport) 
#else
#define THREADDLL_API __declspec(dllimport) 
#endif

#include "stdafx.h"
#include <Windows.h>
#include <stdio.h>

    class ThreadClass
    {
    public: 
        static THREADDLL_API DWORD common_createthread();

    };

MyDLL.cpp

#include "MyDLL.h"

using namespace std;

DWORD WINAPI mythread(__in LPVOID lpParameter)
{
printf("Thread inside %d \n", GetCurrentThreadId());
return 0;
} 

    DWORD ThreadClass::common_createthread()
    {
HANDLE myhandle;
DWORD mythreadid;

#ifdef WIN32
myhandle = CreateThread(0, 0, mythread, 0, 0, &mythreadid);
#elif
pthread_t ptid; 
int err; 
err = pthread_create(&ptid, NULL, &mythread, NULL); 
#endif
return 0;
    }

Application (mainapplication)

mainapplicatin.cpp

#include "stdafx.h"
#include "MyDLL.h"

int _tmain(int argc, _TCHAR* argv[])
{
ThreadClass threadobj;
threadobj.common_createthread();
getchar();
return 0;
}