linux-kernel - Re: [take24 0/6] kevent: Generic event handling mechanism.

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Date:	Tue, 21 Nov 2006 23:38:25 -0800
From:	Ulrich Drepper <drepper@...hat.com>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
CC:	David Miller <davem@...emloft.net>, Andrew Morton <akpm@...l.org>,
	netdev <netdev@...r.kernel.org>,
	Zach Brown <zach.brown@...cle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Chase Venters <chase.venters@...entec.com>,
	Johann Borck <johann.borck@...sedata.com>,
	linux-kernel@...r.kernel.org, Jeff Garzik <jeff@...zik.org>,
	Alexander Viro <aviro@...hat.com>
Subject: Re: [take24 0/6] kevent: Generic event handling mechanism.

Evgeniy Polyakov wrote:
> I've checked the code.
> Since it will be a union, it is impossible to use _sigev_thread and it
> 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;


For 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.

-- 
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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