source: rtems-libbsd/rtemsbsd/src/rtems-bsd-thread.c @ b41a358

/**
 * @file
 *
 * @ingroup rtems_bsd_rtems
 *
 * @brief TODO.
 */

/*
 * Copyright (c) 2009, 2010 embedded brains GmbH.  All rights reserved.
 *
 *  embedded brains GmbH
 *  Obere Lagerstr. 30
 *  82178 Puchheim
 *  Germany
 *  <rtems@embedded-brains.de>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <freebsd/machine/rtems-bsd-config.h>

#include <freebsd/sys/param.h>
#include <freebsd/sys/types.h>
#include <freebsd/sys/systm.h>
#include <freebsd/sys/proc.h>
#include <freebsd/sys/kthread.h>
#include <freebsd/sys/malloc.h>

RTEMS_CHAIN_DEFINE_EMPTY(rtems_bsd_thread_chain);

/* FIXME: What to do with the credentials? */
static struct ucred FIXME_ucred = {
  .cr_ref = 1
};

static int
rtems_bsd_thread_start(struct thread **td_ptr, void (*func)(void *), void *arg, int flags, int pages, const char *fmt, va_list ap)
{
        struct thread *td = malloc(sizeof(struct thread), M_TEMP, M_WAITOK | M_ZERO);

        if (td != NULL) {
                rtems_status_code sc = RTEMS_SUCCESSFUL;
                rtems_id id = RTEMS_ID_NONE;
                unsigned index = 0;
                char name [5] = "_???";

                BSD_ASSERT(pages >= 0);

                sc = rtems_task_create(
                        rtems_build_name('_', 'T', 'S', 'K'),
                        BSD_TASK_PRIORITY_NORMAL,
                        BSD_MINIMUM_TASK_STACK_SIZE + (size_t) pages * PAGE_SIZE,
                        RTEMS_DEFAULT_ATTRIBUTES,
                        RTEMS_DEFAULT_ATTRIBUTES,
                        &id
                );
                if (sc != RTEMS_SUCCESSFUL) {
                        free(td, M_TEMP);

                        return ENOMEM;
                }

    sc = rtems_task_set_note( id, RTEMS_NOTEPAD_0, ( uint32_t )td );
    if (sc != RTEMS_SUCCESSFUL) {
      free(td, M_TEMP);

      return ENOMEM;
    }

                index = rtems_object_id_get_index(id);
                snprintf(name + 1, sizeof(name) - 1, "%03u", index);
                sc = rtems_object_set_name(id, name);
                if (sc != RTEMS_SUCCESSFUL) {
                        rtems_task_delete(id);
                        free(td, M_TEMP);

                        return ENOMEM;
                }

                sc = rtems_task_start(id, (rtems_task_entry) func, (rtems_task_argument) arg);
                if (sc != RTEMS_SUCCESSFUL) {
                        rtems_task_delete(id);
                        free(td, M_TEMP);

                        return ENOMEM;
                }

                td->td_id = id;
                vsnprintf(td->td_name, sizeof(td->td_name), fmt, ap);
                td->td_ucred = crhold(&FIXME_ucred);

                rtems_chain_append(&rtems_bsd_thread_chain, &td->td_node);

                if (td_ptr != NULL) {
                        *td_ptr = td;
                }

                return 0;
        }

        return ENOMEM;
}

static void rtems_bsd_thread_delete(void) __dead2;

static void
rtems_bsd_thread_delete(void)
{
        rtems_chain_control *chain = &rtems_bsd_thread_chain;
        rtems_chain_node *node = rtems_chain_first(chain);
        rtems_id id = rtems_task_self();
        struct thread *td = NULL;

        while (!rtems_chain_is_tail(chain, node)) {
                struct thread *cur = (struct thread *) node;

                if (cur->td_id == id) {
                        td = cur;
                        break;
                }

                node = rtems_chain_next(node);
        }

        if (td != NULL) {
                rtems_chain_extract(&td->td_node);

                free(td, M_TEMP);
        } else {
                BSD_PANIC("cannot find task entry");
        }

        rtems_task_delete(RTEMS_SELF);

        while (true) {
                /* Do nothing */
        }
}

void
kproc_start(const void *udata)
{
        const struct kproc_desc *pd = udata;
        int eno = kproc_create((void (*)(void *))pd->func, NULL, pd->global_procpp, 0, 0, "%s", pd->arg0);

        BSD_ASSERT(eno == 0);
}

int
kproc_create(void (*func)(void *), void *arg, struct proc **newpp, int flags, int pages, const char *fmt, ...)
{
        int eno = 0;
        va_list ap;

        va_start(ap, fmt);
        eno = rtems_bsd_thread_start(newpp, func, arg, flags, pages, fmt, ap);
        va_end(ap);

        return eno;
}

void
kproc_exit(int ecode)
{
        rtems_bsd_thread_delete();
}

void
kthread_start(const void *udata)
{
        const struct kthread_desc *td = udata;
        int eno = kthread_add((void (*)(void *)) td->func, NULL, NULL, td->global_threadpp, 0, 0, "%s", td->arg0);

        BSD_ASSERT(eno == 0);
}

int
kthread_add(void (*func)(void *), void *arg, struct proc *p, struct thread **newtdp, int flags, int pages, const char *fmt, ...)
{
        int eno = 0;
        va_list ap;

        va_start(ap, fmt);
        eno = rtems_bsd_thread_start(newtdp, func, arg, flags, pages, fmt, ap);
        va_end(ap);

        return eno;
}

void
kthread_exit(void)
{
        rtems_bsd_thread_delete();
}

int
kproc_kthread_add(void (*func)(void *), void *arg, struct proc **procptr, struct thread **tdptr, int flags, int pages, const char * procname, const char *fmt, ...)
{
        int eno = 0;
        va_list ap;

        va_start(ap, fmt);
        eno = rtems_bsd_thread_start(tdptr, func, arg, flags, pages, fmt, ap);
        va_end(ap);

        return eno;
}