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

[Ulrich Drepper <drepper@redhat.com>]

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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