PTHREAD_THREADID_NP(3)

NAME
pthread_threadid_np - get the calling thread's unique ID

SYNOPSIS
#include <pthread.h>
int
pthread_threadid_np(pthread_t thread, uint64_t *thread_id);

DESCRIPTION
The pthread_threadid_np() function stores the system-wide unique integral ID of thread in the location spedified by thread_id. If thread is NULL, the ID of the current thread is provided.

RETURN VALUES
If successful, the pthread_threadid_np() function will return zero. Otherwise an error number will be returned to indicate the error.

ERRORS
The pthread_threadid_np() function will fail if:

[EINVAL]
    NULL value for thread_id.

[ESRCH]
    Non-existent thread thread.

SEE ALSO
pthread_self(3)