https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/Multithreading/CreatingThreads/CreatingThreads.html

#include 
        

#include 
        

void* PosixThreadMainRoutine(void* data)

{

// Do some work here.

return NULL;

}

void LaunchThread()

{

// Create the thread using POSIX routines.

pthread_attr_t  attr;

pthread_t       posixThreadID;

int             returnVal;

returnVal = pthread_attr_init(&attr);

assert(!returnVal);

returnVal = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);

assert(!returnVal);

int     threadError = pthread_create(&posixThreadID, &attr, &PosixThreadMainRoutine, NULL);

returnVal = pthread_attr_destroy(&attr);

assert(!returnVal);

if (threadError != 0)

{

// Report an error.

}

}