8158 Want named threads API
9857 proc manpages should have LIBRARY section

*** 23,33 ****
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  /*
!  * Copyright 2017 Joyent, Inc.
   * Copyright (c) 2013 by Delphix. All rights reserved.
   */
  
  #ifndef _SYS_DTRACE_H
  #define _SYS_DTRACE_H
--- 23,33 ----
   * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   */
  
  /*
!  * Copyright 2018 Joyent, Inc.
   * Copyright (c) 2013 by Delphix. All rights reserved.
   */
  
  #ifndef _SYS_DTRACE_H
  #define _SYS_DTRACE_H
*** 240,249 ****
--- 240,250 ----
  #define DIF_VAR_UCALLER         0x011c  /* user-level caller */
  #define DIF_VAR_PPID            0x011d  /* parent process ID */
  #define DIF_VAR_UID             0x011e  /* process user ID */
  #define DIF_VAR_GID             0x011f  /* process group ID */
  #define DIF_VAR_ERRNO           0x0120  /* thread errno */
+ #define DIF_VAR_THREADNAME      0x0121  /* thread name */
  
  #define DIF_SUBR_RAND                   0
  #define DIF_SUBR_MUTEX_OWNED            1
  #define DIF_SUBR_MUTEX_OWNER            2
  #define DIF_SUBR_MUTEX_TYPE_ADAPTIVE    3