Use pthread_attr_getscope(3T) to retrieve the thread scope, which indicates whether the thread is bound or unbound.
Prototype: int pthread_attr_getscope(pthread_attr_t *tattr, int *scope);
#include <pthread.h> pthread_attr_t tattr; int scope; int ret; /* get scope of thread */ ret = pthread_attr_getscope(&tattr, &scope);
pthread_attr_getscope() returns zero after completing successfully. Any other returned value indicates that an error occurred. If the following condition occurs, the function fails and returns the corresponding value.