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PTHREAD_SET_NAME_NP(3) Library Functions Manual PTHREAD_SET_NAME_NP(3)

pthread_set_name_np
set the name of a thread

#include <pthread.h>
#include <pthread_np.h>
void
pthread_set_name_np(pthread_t thread, const char *name);

The pthread_set_name_np() function associates name with thread. This can be useful for debugging, as the name is displayed in the thread status as displayed when the process receives the SIGINFO signal.
The string pointed to by name is copied, and so need not be valid for the life of the thread.

pthreads(3)

The pthread_set_name_np() function is non-portable and may not be supported with the above semantics on other POSIX systems.
March 6, 2014 OpenBSD-current