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Linux 2.6 - man page for tgkill (linux section 2)

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TKILL(2)			    Linux Programmer's Manual				 TKILL(2)

       tkill, tgkill - send a signal to a thread

       int tkill(int tid, int sig);

       int tgkill(int tgid, int tid, int sig);

       Note: There are no glibc wrappers for these system calls; see NOTES.

       tgkill()  sends	the  signal  sig to the thread with the thread ID tid in the thread group
       tgid.  (By contrast, kill(2) can be used to send a signal only to a process (i.e.,  thread
       group)  as  a  whole,  and the signal will be delivered to an arbitrary thread within that

       tkill() is an obsolete predecessor to tgkill().	It allows only the target thread ID to be
       specified,  which may result in the wrong thread being signaled if a thread terminates and
       its thread ID is recycled.  Avoid using this system call.

       If tgid is specified as -1, tgkill() is equivalent to tkill().

       These are the raw system call interfaces, meant for internal thread library use.

       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

       EINVAL An invalid thread ID, thread group ID, or signal was specified.

       EPERM  Permission denied.  For the required permissions, see kill(2).

       ESRCH  No process with the specified thread ID (and thread group ID) exists.

       tkill() is supported since Linux 2.4.19 / 2.5.4.  tgkill() was added in Linux 2.5.75.

       tkill() and tgkill() are Linux-specific and should  not	be  used  in  programs	that  are
       intended to be portable.

       See the description of CLONE_THREAD in clone(2) for an explanation of thread groups.

       Glibc does not provide wrappers for these system calls; call them using syscall(2).

       clone(2), gettid(2), kill(2), rt_sigqueueinfo(2)

       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at

Linux					    2012-07-13					 TKILL(2)
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