multithreading - Run a specific set of lines within a function in a different thread in C -

i have huge function (length>4000) lines. in function, have more 100 variables declared in beginning. now, want run specific block of lines in different thread. example, want run lines 2000-3000 in different thread. how do this?

to scale down example, have:

int functiona() {     .....variables declared......     .....variables declared......     printf("hello");     printf("this");     printf("is in another");     printf("thread"); } 

i want run 4 printf functions in thread.

to this, i've done:

int functiona() {     .....variables declared......     .....variables declared......     void functionb()     {        printf("hello");        printf("this");        printf("is in another");        printf("thread");     }     pthread_create(&tid, null, functionb, null);     pthread_join(tid, null); } 

i know terrible way this. however, there many variables pass in case want make functionb new independent function.

please let me know how proceed.

what in case is: create struct containing needed variables. create new function pointer struct parameter. can create new thread using function , have pass struct. struct creation coded fast, have put

struct nameforstruct {     //declare vars here, e.g.:     int somevar; } 

around , change access vars copy-pasting structname-> in front of it.

function may like:

void threadingstuff(struct nametostruct * myvars) {     if (myvars->somevar == 1) {         // stuff     } } 

that in opinion fastest way achieve want (and way lessest work). consider refactoring better approach...