winsup/cygwin/libc/thrd.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD$
  29  */
  30
  31 #ifdef __CYGWIN__
  32 #include <errno.h>
  33 #endif
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <pthread.h>
  39 #include <stdint.h>
  40 #include <stdlib.h>
  41
  42 #include "threads.h"
  43
  44 struct thrd_param {
  45         thrd_start_t     func;
  46         void            *arg;
  47 };
  48
  49 static void *
  50 thrd_entry(void *arg)
  51 {
  52         struct thrd_param tp;
  53
  54         tp = *(struct thrd_param *)arg;
  55         free(arg);
  56         return ((void *)(intptr_t)tp.func(tp.arg));
  57 }
  58
  59 int
  60 thrd_create(thrd_t *thr, thrd_start_t func, void *arg)
  61 {
  62         struct thrd_param *tp;
  63
  64         /*
  65          * Work around return type inconsistency.  Wrap execution using
  66          * a function conforming to pthread_create()'s start_routine.
  67          */
  68         tp = malloc(sizeof(*tp));
  69         if (tp == NULL)
  70                 return (thrd_nomem);
  71         tp->func = func;
  72         tp->arg = arg;
  73         if (pthread_create(thr, NULL, thrd_entry, tp) != 0) {
  74                 free(tp);
  75                 return (thrd_error);
  76         }
  77         return (thrd_success);
  78 }
  79
  80 thrd_t
  81 thrd_current(void)
  82 {
  83
  84         return (pthread_self());
  85 }
  86
  87 int
  88 thrd_detach(thrd_t thr)
  89 {
  90
  91         if (pthread_detach(thr) != 0)
  92                 return (thrd_error);
  93         return (thrd_success);
  94 }
  95
  96 int
  97 thrd_equal(thrd_t thr0, thrd_t thr1)
  98 {
  99
 100         return (pthread_equal(thr0, thr1));
 101 }
 102
 103 _Noreturn void
 104 thrd_exit(int res)
 105 {
 106
 107         pthread_exit((void *)(intptr_t)res);
 108 }
 109
 110 int
 111 thrd_join(thrd_t thr, int *res)
 112 {
 113         void *value_ptr;
 114
 115         if (pthread_join(thr, &value_ptr) != 0)
 116                 return (thrd_error);
 117         if (res != NULL)
 118                 *res = (intptr_t)value_ptr;
 119         return (thrd_success);
 120 }
 121
 122 int
 123 thrd_sleep(const struct timespec *duration, struct timespec *remaining)
 124 {
 125 #ifdef __CYGWIN__
 126         /* Return value per POSIX:
 127             0 on successful sleep,
 128            -1 if a signal occurred,
 129            other negative value if an error occurred. */
 130         int ret = clock_nanosleep(CLOCK_REALTIME, 0, duration, remaining);
 131         switch (ret) {
 132         case 0:
 133                 return 0;
 134         case EINTR:
 135                 return -1;
 136         default:
 137                 return -ret;    /* EPERM isn't generated by clock_nanosleep
 138                                    so this is safe. */
 139         }
 140 #else
 141         int ret = nanosleep(duration, remaining);
 142 #endif
 143 }
 144
 145 void
 146 thrd_yield(void)
 147 {
 148
 149         pthread_yield();
 150 }