cc -mt [ flag... ] file... [ library... ] #include <thread.h>
The thr_main() function returns one of the following:
1 if the calling thread is the main thread
0 if the calling thread is not the main thread
-1 if libthread is not linked in or thread initialization has not completed
/lib/libthread
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| MT-Level | MT-Safe |
thr_self(3C), attributes(5)