[Bug 53061] New: pthread_kill() should describe it may cause SEGV when target thread doesn't exist

[Bug 53061] New: pthread_kill() should describe it may cause SEGV when target thread doesn't exist

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=53061

           Summary: pthread_kill() should describe it may cause SEGV when
                    target thread doesn't exist
           Product: Documentation
           Version: unspecified
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: man-pages
        AssignedTo: documentation_man-pages-ztI5WcYan/vQLgFONoPN62D2FQJk+8+b@public.gmane.org
        ReportedBy: kosaki.motohiro-+CUm20s59erQFUHtdCDX3A@public.gmane.org
        Regression: No


Now, pthrad_kill() man page have following explanation.

http://man7.org/linux/man-pages/man3/pthread_kill.3.html

>ERRORS         
>
>       EINVAL An invalid signal was specified.
>
>       ESRCH  No thread with the ID thread could be found.


But it is misleading. Current implementation cause SEGV when no thread ID exist
highly likely.

As suggested Rich on libc-alpha
(http://permalink.gmane.org/gmane.comp.lib.glibc.alpha/28919). 
it would be nice if the man page point to following POSIX sentence.


POSIX XSH 2.9.2:

"The lifetime of a thread ID ends after the thread terminates if it
was created with the detachstate attribute set to
PTHREAD_CREATE_DETACHED or if pthread_detach() or pthread_join() has
been called for that thread. A conforming implementation is free to
reuse a thread ID after its lifetime has ended. If an application
attempts to use a thread ID whose lifetime has ended, the behavior is
undefined."

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[Bug 53061] pthread_kill() should describe it may cause SEGV when target thread doesn't exist

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=53061

Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
         Resolution|---                         |CODE_FIX

--- Comment #1 from Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
The pthreads(7) page now carries this text:

[[
The system may reuse a thread ID after a terminated thread has been joined,
or a detached thread has terminated.
POSIX says: "If an application attempts to use a thread ID whose
lifetime has ended, the behavior is undefined."
]]

I think that more or less satisfies your request, so I'm closing this bug.

Thanks for the report.

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