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THR_SELF(2)		      System Calls Manual		   THR_SELF(2)

NAME
       thr_self	-- return thread identifier for	the calling thread

LIBRARY
       Standard	C Library (libc, -lc)

SYNOPSIS
       #include	<sys/thr.h>

       int
       thr_self(long *id);

DESCRIPTION
       The thr_self() system call stores the system-wide thread	identifier for
       the  current kernel-scheduled thread in the variable pointed by the ar-
       gument id.

       The thread identifier is	an integer in  the  range  from	 PID_MAX  +  2
       (100001)	 to INT_MAX.  The thread identifier is guaranteed to be	unique
       at any given time, for each running thread in the  system.   After  the
       thread exits, the identifier may	be reused.

RETURN VALUES
       If  successful,	thr_self() will	return zero, otherwise -1 is returned,
       and errno is set	to indicate the	error.

ERRORS
       The thr_self() operation	may return the following errors:

       [EFAULT]		  The memory pointed to	by  the	 id  argument  is  not
			  valid.

SEE ALSO
       _umtx_op(2),   thr_exit(2),   thr_kill(2),   thr_kill2(2),  thr_new(2),
       thr_set_name(2),	pthread_getthreadid_np(3), pthread_self(3)

STANDARDS
       The thr_self() system call is non-standard and is used by 1:1 Threading
       Library (libthr,	-lthr) to implement IEEE Std  1003.1-2001  ("POSIX.1")
       pthread(3) functionality.

HISTORY
       The thr_self() system call first	appeared in FreeBSD 5.2.

FreeBSD	13.2			  May 5, 2020			   THR_SELF(2)

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | STANDARDS | HISTORY

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