extension.h

/*
 * Copyright (C) 2013 Philippe Gerum <rpm@xenomai.org>.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
#ifndef _COBALT_POSIX_EXTENSION_H
#define _COBALT_POSIX_EXTENSION_H

#include <linux/time.h>
#include <linux/list.h>

#ifdef CONFIG_XENO_OPT_COBALT_EXTENSION

#include <cobalt/kernel/thread.h>

struct cobalt_timer;
struct cobalt_sigpending;
struct cobalt_extref;
struct siginfo;
struct xnsched_class;
union xnsched_policy_param;

struct cobalt_extension {
        struct xnthread_personality core;
        struct {
                struct cobalt_thread *
                (*timer_init)(struct cobalt_extref *reftimer, /* nklocked, IRQs off. */
                              const struct sigevent *__restrict__ evp);
                int (*timer_settime)(struct cobalt_extref *reftimer, /* nklocked, IRQs off. */
                                     const struct itimerspec *__restrict__ value,
                                     int flags);
                int (*timer_gettime)(struct cobalt_extref *reftimer, /* nklocked, IRQs off. */
                                     struct itimerspec *__restrict__ value);
                int (*timer_delete)(struct cobalt_extref *reftimer); /* nklocked, IRQs off. */
                int (*timer_cleanup)(struct cobalt_extref *reftimer); /* nklocked, IRQs off. */
                int (*signal_deliver)(struct cobalt_extref *refthread,
                                      struct siginfo *si,
                                      struct cobalt_sigpending *sigp);
                int (*signal_queue)(struct cobalt_extref *refthread,
                                    struct cobalt_sigpending *sigp);
                int (*signal_copyinfo)(struct cobalt_extref *refthread,
                                       void __user *u_si,
                                       const struct siginfo *si,
                                       int overrun);
                int (*sched_yield)(struct cobalt_extref *curref);
                int (*thread_setsched)(struct cobalt_extref *refthread, /* nklocked, IRQs off. */
                                       struct xnsched_class *sched_class,
                                       union xnsched_policy_param *param);
        } ops;
};

struct cobalt_extref {
        struct cobalt_extension *extension;
        struct list_head next;
        void *private;
};

static inline void cobalt_set_extref(struct cobalt_extref *ref,
                                     struct cobalt_extension *ext,
                                     void *priv)
{
        ref->extension = ext;
        ref->private = priv;
}

#define cobalt_initcall_extension(__extfn, __extref, __owner, __ret, __args...) \
        ({                                                                      \
                int __val = 0;                                                  \
                if ((__owner) && (__owner)->extref.extension) {                 \
                        (__extref)->extension = (__owner)->extref.extension;    \
                        if ((__extref)->extension->ops.__extfn) {               \
                                (__ret) = (__extref)->extension->ops.           \
                                        __extfn(__extref, ##__args );           \
                                __val = 1;                                      \
                        }                                                       \
                } else                                                          \
                        (__extref)->extension = NULL;                           \
                __val;                                                          \
        })
                
#define cobalt_call_extension(__extfn, __extref, __ret, __args...)      \
        ({                                                              \
                int __val = 0;                                          \
                if ((__extref)->extension &&                            \
                    (__extref)->extension->ops.__extfn) {               \
                        (__ret) = (__extref)->extension->ops.           \
                                __extfn(__extref, ##__args );           \
                        __val = 1;                                      \
                }                                                       \
                __val;                                                  \
        })

#else /* !CONFIG_XENO_OPT_COBALT_EXTENSION */

struct cobalt_extension;

struct cobalt_extref {
};

static inline void cobalt_set_extref(struct cobalt_extref *ref,
                                     struct cobalt_extension *ext,
                                     void *priv)
{
}

#define cobalt_initcall_extension(__extfn, __extref, __owner, __ret, __args...) \
        ({ (void)(__owner); (void)(__ret); 0; })

#define cobalt_call_extension(__extfn, __extref, __ret, __args...)      \
        ({ (void)(__ret); 0; })

#endif /* !CONFIG_XENO_OPT_COBALT_EXTENSION */

#endif /* !_COBALT_POSIX_EXTENSION_H */