NAME
thr_kill —
send signal to thread
LIBRARY
library “libc”
SYNOPSIS
#include
<sys/thr.h>
int
thr_kill(long
id, int sig);
int
thr_kill2(pid_t
pid, long id,
int sig);
DESCRIPTION
Thethr_kill()
and
thr_kill2()
system calls allow sending a signal, specified by the
sig argument, to some threads in a process. For the
thr_kill() function, signalled threads are always
limited to the current process. For the thr_kill2()
function, the pid argument specifies the process with
threads to be signalled.
The id argument specifies which threads get the signal. If id is equal to -1, all threads in the specified process are signalled. Otherwise, only the thread with the thread identifier equal to the argument is signalled.
The sig argument defines the delivered signal. It must be a valid signal number or zero. In the latter case no signal is actually sent, and the call is used to verify the liveness of the thread.
The signal is delivered with siginfo
si_code set to SI_LWP.
RETURN VALUES
If successful, thr_kill() and
thr_kill2() will return zero, otherwise -1 is
returned, and errno is set to indicate the error.
ERRORS
The thr_kill() and
thr_kill2() operations return the following
errors:
- [
EINVAL] - The sig argument is not zero and does not specify valid signal.
- [
ESRCH] - The specified process or thread was not found.
Additionally, the thr_kill2() may return
the following errors:
- [
EPERM] - The current process does not have sufficient privilege to check existence or send a signal to the specified process.
SEE ALSO
kill(2), thr_exit(2), thr_new(2), thr_self(2), thr_set_name(2), _umtx_op(2), pthread_kill(3), signal(3)
STANDARDS
The thr_kill() and
thr_kill2() system calls are non-standard and are
used by the library “libthr” to
implement IEEE Std 1003.1-2001
(“POSIX.1”)
pthread(3) functionality.