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36 .Nd return thread identifier for the calling thread
42 .Fn thr_self "long *id"
46 system call stores the system-wide thread identifier for the current
47 kernel-scheduled thread in the variable pointed by the argument
50 The thread identifier is an integer in the range from
54 The thread identifier is guaranteed to be unique at any given time,
55 for each running thread in the system.
56 After the thread exits, the identifier may be reused.
60 will return zero, otherwise \-1 is returned, and
62 is set to indicate the error.
66 operation may return the following errors:
69 The memory pointed to by the
71 argument is not valid.
80 .Xr pthread_getthreadid_np 3 ,
85 system call is non-standard and is used by