tkill, tgkill - send a signal to a thread
int tkill(int tid, int sig);
int tgkill(int tgid, int tid, int sig);
Note
: There is no glibc wrapper for tkill(); 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 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.
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.
The RLIMIT_SIGPENDING resource limit was reached and sig
is a real-time signal.
Insufficient kernel memory was available and sig
is a real-time signal.
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.
clone(2), gettid(2), kill(2), rt_sigqueueinfo(2)
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