multithreading - C thread not behaving correctly - simple code -

i creating new thread in c using _beginthreadex. have written following code. same code written in 2 versions, first version working second 1 not working.

working code

main.c

#include <windows.h> #include <stdio.h>  extern void func(unsigned (__stdcall *secondthreadfunc)( void* ));  int main() {      func(null); } 

second.c

#include<windows.h>  //when thread start routine declared in same file new thread running fine... //but if routine moved main.c , passed parameter func new thread not working unsigned __stdcall secondthreadfunc( void* parguments ) {     printf( "in second thread...\n ");     return 0; }    void func(unsigned (__stdcall *secondthreadfunc)( void* )) {     handle hthread;     printf( "creating second thread...\n" );      // create second thread.     hthread = (handle)_beginthreadex( null, 0, &secondthreadfunc, null, 0, null );      // wait until second thread terminates.     waitforsingleobject( hthread, infinite ); } 

not working code(below)

main.c

#include <windows.h> #include <stdio.h> #include <process.h>   extern void func(unsigned (__stdcall *secondthreadfunc)( void* ));  unsigned __stdcall secondthreadfunc( void* parguments ) {     printf( "in second thread...\n ");     return 0; }   int main() {      func(secondthreadfunc); } 

second.c

#include<windows.h>  void func(unsigned (__stdcall *secondthreadfunc)( void* )) {     handle hthread;     printf( "creating second thread...\n" );      // create second thread.     hthread = (handle)_beginthreadex( null, 0, &secondthreadfunc, null, 0, null );      // wait until second thread terminates.     waitforsingleobject( hthread, infinite ); } 

i getting access violation inside _beginthreadex while calling secondthreadfunc. can me out. in advance.

in not working code should have (pay attention &s):

hthread = (handle)_beginthreadex( null, 0, secondthreadfunc, null, 0, null );