/*      $NetBSD: thrd.c,v 1.4 2019/09/10 22:34:19 kamil Exp $   */

/*-
* Copyright (c) 2016 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Kamil Rytarowski.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <sys/cdefs.h>
__RCSID("$NetBSD: thrd.c,v 1.4 2019/09/10 22:34:19 kamil Exp $");

#include <assert.h>
#include <errno.h>
#include <pthread.h>
#include <sched.h>
#include <stdlib.h>
#include <time.h>
#include <threads.h>

struct __thrd_tramp_data {
       thrd_start_t func;
       void *arg;
};

static void *
__thrd_create_tramp(void *arg)
{
       struct __thrd_tramp_data *cookie;
       int ret;

       _DIAGASSERT(arg != NULL);

       cookie = (struct __thrd_tramp_data *)arg;

       ret = (cookie->func)(cookie->arg);

       free(cookie);

       return (void *)(intptr_t)ret;
}

int
thrd_create(thrd_t *thr, thrd_start_t func, void *arg)
{
       struct __thrd_tramp_data *cookie;
       int error;

       _DIAGASSERT(thr != NULL);
       _DIAGASSERT(func != NULL);

       cookie = malloc(sizeof(*cookie));
       if (cookie == NULL)
               return thrd_nomem;

       cookie->func = func;
       cookie->arg = arg;

       switch(pthread_create(thr, NULL, __thrd_create_tramp, cookie)) {
       case 0:
               return thrd_success;
       case ENOMEM:
               error = thrd_nomem;
               break;
       default:
               error = thrd_error;
       }

       free(cookie);

       return error;
}

thrd_t
thrd_current(void)
{

       return pthread_self();
}

int
thrd_detach(thrd_t thr)
{

       _DIAGASSERT(thr != NULL);

       if (pthread_detach(thr) == 0)
               return thrd_success;

       return thrd_error;
}

int
thrd_equal(thrd_t t1, thrd_t t2)
{

       _DIAGASSERT(t1 != NULL);
       _DIAGASSERT(t2 != NULL);

       return pthread_equal(t1, t2);
}

__dead void
thrd_exit(int res)
{

       pthread_exit((void *)(intptr_t)res);
}

int
thrd_join(thrd_t thrd, int *res)
{
       void *ptr;

       _DIAGASSERT(thrd != NULL);

       if (pthread_join(thrd, &ptr) == 0) {
               if (res)
                       *res = (int)(intptr_t)ptr;

               return thrd_success;
       }

       return thrd_error;
}

int
thrd_sleep(const struct timespec *duration, struct timespec *remaining)
{

       _DIAGASSERT(duration != NULL);

       /* Use clock_nanosleep(3) to skip handling errno */

       switch (clock_nanosleep(CLOCK_MONOTONIC, TIMER_RELTIME, duration,
           remaining)) {
       case 0:
               return 0;
       case EINTR:
               return -1;
       default:
               /* Negative value different than -1 */
               return -2;
       }
}

void
thrd_yield(void)
{

       sched_yield();
}