lib/libstdthreads/thrd.c

   1 /*-
   2  * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <pthread.h>
  33 #include <stdint.h>
  34 #include <stdlib.h>
  35
  36 #include "threads.h"
  37
  38 struct thrd_param {
  39         thrd_start_t     func;
  40         void            *arg;
  41 };
  42
  43 static void *
  44 thrd_entry(void *arg)
  45 {
  46         struct thrd_param tp;
  47
  48         tp = *(struct thrd_param *)arg;
  49         free(arg);
  50         return ((void *)(intptr_t)tp.func(tp.arg));
  51 }
  52
  53 int
  54 thrd_create(thrd_t *thr, thrd_start_t func, void *arg)
  55 {
  56         struct thrd_param *tp;
  57
  58         /*
  59          * Work around return type inconsistency.  Wrap execution using
  60          * a function conforming to pthread_create()'s start_routine.
  61          */
  62         tp = malloc(sizeof(*tp));
  63         if (tp == NULL)
  64                 return (thrd_nomem);
  65         tp->func = func;
  66         tp->arg = arg;
  67         if (pthread_create(thr, NULL, thrd_entry, tp) != 0) {
  68                 free(tp);
  69                 return (thrd_error);
  70         }
  71         return (thrd_success);
  72 }
  73
  74 thrd_t
  75 thrd_current(void)
  76 {
  77
  78         return (pthread_self());
  79 }
  80
  81 int
  82 thrd_detach(thrd_t thr)
  83 {
  84
  85         if (pthread_detach(thr) != 0)
  86                 return (thrd_error);
  87         return (thrd_success);
  88 }
  89
  90 int
  91 thrd_equal(thrd_t thr0, thrd_t thr1)
  92 {
  93
  94         return (pthread_equal(thr0, thr1));
  95 }
  96
  97 _Noreturn void
  98 thrd_exit(int res)
  99 {
 100
 101         pthread_exit((void *)(intptr_t)res);
 102 }
 103
 104 int
 105 thrd_join(thrd_t thr, int *res)
 106 {
 107         void *value_ptr;
 108
 109         if (pthread_join(thr, &value_ptr) != 0)
 110                 return (thrd_error);
 111         if (res != NULL)
 112                 *res = (intptr_t)value_ptr;
 113         return (thrd_success);
 114 }
 115
 116 int
 117 thrd_sleep(const struct timespec *duration, struct timespec *remaining)
 118 {
 119
 120         return (nanosleep(duration, remaining));
 121 }
 122
 123 void
 124 thrd_yield(void)
 125 {
 126
 127         pthread_yield();
 128 }