Manpage of TKILL
TKILLSection: Linux Programmer's Manual (2)
NAMEtkill, tgkill - send a signal to a thread
int tkill(int tid, int sig);int tgkill(int tgid, int tid, int sig);
DESCRIPTIONtgkill() sends the signal sigto the thread with the thread ID tidin 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 process.)
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.
RETURN VALUEOn success, zero is returned. On error, -1 is returned, and errnois set appropriately.
- An invalid thread ID, thread group ID, or signal was specified.
- Permission denied. For the required permissions, see kill(2).
- No process with the specified thread ID (and thread group ID) exists.
- The RLIMIT_SIGPENDINGresource limit was reached and sigis a real-time signal.
- Insufficient kernel memory was available and sigis a real-time signal.
VERSIONStkill() is supported since Linux 2.4.19 / 2.5.4. tgkill() was added in Linux 2.5.75.
CONFORMING TOtkill() and tgkill() are Linux-specific and should not be used in programs that are intended to be portable.
NOTESSee the description of CLONE_THREADin clone(2) for an explanation of thread groups.
Glibc does not provide wrappers for these system calls; call them using syscall(2).
SEE ALSOclone(2), gettid(2), kill(2), rt_sigqueueinfo(2)
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