c - Creating a thread -

i know can create thread within program createthread() , need waitforsingleobject() finish before returning original program.

my question is, original program thread well? say, have variable a=3 in program, create thread. second thread, can access variable a?

when windows o/s starts process create first thread process.

so, "original program" wrong name. initial item executing progra m thread.

when variable scope allows access second thread can access it. if want pass access specific variable can use appropriate parameter createthread pass pointer it. beware: when execution of original thread goes out of scope of variable pointer gets invalid. recommend consider redesign.

edit requested, here example variable going out of scope. wrong implementation:

dword thethread(void*p) {     int *pcounter = (int*)p;     // pcounter }  handle makeitrun() {     int counter;     return createthread(0, 0, &thethread, &counter, 0, 0); } // scope of counter ends here  int main() {     handle h;     h = makeitrun();     waitforsingleobject(h, infinite); }