Provided by: systemtap-doc_2.3-1ubuntu1.4_all 

NAME
probe::signal.sys_tkill - Sending a kill signal to a thread
SYNOPSIS
signal.sys_tkill
VALUES
sig_pid
The PID of the process receiving the kill signal
pid_name
The name of the signal recipient
sig_name
A string representation of the signal
sig
The specific signal sent to the process
name
Name of the probe point
DESCRIPTION
The tkill call is analogous to kill(2), except that it also allows a process within a specific thread
group to be targeted. Such processes are targeted through their unique thread IDs (TID).
SystemTap Tapset Reference March 2016 PROBE::SIGNAL.SYS_(3stap)