From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ulrich Drepper <drepper@redhat.com>
Subject: Re: [take24 0/6] kevent: Generic event handling mechanism.
Date: Tue, 21 Nov 2006 23:38:25 -0800
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Cc: David Miller <davem@davemloft.net>, Andrew Morton <akpm@osdl.org>,
	netdev <netdev@vger.kernel.org>,
	Zach Brown <zach.brown@oracle.com>,
	Christoph Hellwig <hch@infradead.org>,
	Chase Venters <chase.venters@clientec.com>,
	Johann Borck <johann.borck@densedata.com>,
	linux-kernel@vger.kernel.org, Jeff Garzik <jeff@garzik.org>,
	Alexander Viro <aviro@redhat.com>
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To: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
In-Reply-To: <20061121184605.GA7787@2ka.mipt.ru>
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Evgeniy Polyakov wrote:
> I've checked the code.
> Since it will be a union, it is impossible to use _sigev_thread and i=
t
> becomes just SIGEV_SIGNAL case with different delivery mechanism.
> Is it what you want?

struct sigevent is defined like this:

typedef struct sigevent {
         sigval_t sigev_value;
         int sigev_signo;
         int sigev_notify;
         union {
                 int _pad[SIGEV_PAD_SIZE];
                  int _tid;

                 struct {
                         void (*_function)(sigval_t);
                         void *_attribute;       /* really pthread_attr=
_t */
                 } _sigev_thread;
         } _sigev_un;
} sigevent_t;


=46or the SIGEV_KEVENT case:

   sigev_notify is set to SIGEV_KEVENT (obviously)

   sigev_value can be used for the void* data passed along with the
   signal, just like in the case of a signal delivery

Now you need a way to specify the kevent descriptor.  Just add

   int _kevent;

inside the union and if you want

   #define sigev_kevent_descr _sigev_un._kevent

That should be all.

--=20
=E2=9E=A7 Ulrich Drepper =E2=9E=A7 Red Hat, Inc. =E2=9E=A7 444 Castro S=
t =E2=9E=A7 Mountain View, CA =E2=9D=96