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THR_KILL(2)		       System Calls Manual		     THR_KILL(2)

NAME
     thr_kill -- send signal to thread

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/thr.h>

     int
     thr_kill(long id, int sig);

     int
     thr_kill2(pid_t pid, long id, int sig);

DESCRIPTION
     The  thr_kill() and thr_kill2() system calls allow sending a signal, speci-
     fied 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
     _umtx_op(2),     kill(2),	   thr_exit(2),     thr_new(2),     thr_self(2),
     thr_set_name(2), pthread_kill(3), signal(3)

STANDARDS
     The  thr_kill()  and thr_kill2() system calls are non-standard and are used
     by the  1:1  Threading  Library  (libthr,	-lthr)	to  implement  IEEE  Std
     1003.1-2001 ("POSIX.1") pthread(3) functionality.

HISTORY
     The thr_kill() and thr_kill2() system calls first appeared in FreeBSD 5.2.

FreeBSD ports 15.quarterly	   May 5, 2020			     THR_KILL(2)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=thr_kill&sektion=2&manpath=FreeBSD+15.1-RELEASE+and+Ports.quarterly>

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