NAME
pthread_kill —
send a signal to a thread
SYNOPSIS
int pthread_kill(pthread_t thread, int sig);
DESCRIPTION
The pthread_kill () function shall request
that a signal be delivered to the specified thread.
As in kill(3), if sig is zero, error checking shall be performed but no signal shall actually be sent.
RETURN VALUE
Upon successful completion, the function shall return a value of
zero. Otherwise, the function shall return an error number. If the
pthread_kill () function fails, no signal shall be
sent.
ERRORS
The pthread_kill () function shall fail
if:
- [EINVAL]
- The value of the sig argument is an invalid or unsupported signal number.
The pthread_kill () function shall not
return an error code of [EINTR].
EXAMPLES
None.
APPLICATION USAGE
The pthread_kill () function provides a
mechanism for asynchronously directing a signal at a thread in the calling
process. This could be used, for example, by one thread to affect broadcast
delivery of a signal to a set of threads.
Note that pthread_kill () only causes the
signal to be handled in the context of the given thread; the signal action
(termination or stopping) affects the process as a whole.
RATIONALE
If an implementation detects use of a thread ID after the end of its lifetime, it is recommended that the function should fail and report an [ESRCH] error.
FUTURE DIRECTIONS
None.
SEE ALSO
kill(3), pthread_self(3) , raise(3)
XBD <signal.h>
CHANGE HISTORY
First released in Issue 5. Included for alignment with the POSIX Threads Extension.
Issue 6
The pthread_kill () function is marked as
part of the Threads option.
The APPLICATION USAGE section is added.
Issue 7
The pthread_kill () function is moved from
the Threads option to the Base.
Austin Group Interpretation 1003.1-2001 #142 is applied, removing the [ESRCH] error condition.