lib/libc_r/uthread/uthread_detach.c

   1 /*
   2  * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
   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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by John Birrell.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/lib/libc_r/uthread/uthread_detach.c,v 1.11.2.4 2002/10/22 14:44:03 fjoe Exp $
  33  * $DragonFly: src/lib/libc_r/uthread/uthread_detach.c,v 1.3 2005/05/30 20:50:53 joerg Exp $
  34  */
  35 #include <errno.h>
  36 #include <pthread.h>
  37 #include "pthread_private.h"
  38
  39 int
  40 _pthread_detach(pthread_t pthread)
  41 {
  42         int             rval = 0;
  43
  44         /* Check for invalid calling parameters: */
  45         if (pthread == NULL || pthread->magic != PTHREAD_MAGIC)
  46                 /* Return an invalid argument error: */
  47                 rval = EINVAL;
  48
  49         /* Check if the thread has not been detached: */
  50         else if ((pthread->attr.flags & PTHREAD_DETACHED) == 0) {
  51                 /* Flag the thread as detached: */
  52                 pthread->attr.flags |= PTHREAD_DETACHED;
  53
  54                 /*
  55                  * Defer signals to protect the scheduling queues from
  56                  * access by the signal handler:
  57                  */
  58                 _thread_kern_sig_defer();
  59
  60                 /* Check if there is a joiner: */
  61                 if (pthread->joiner != NULL) {
  62                         struct pthread  *joiner = pthread->joiner;
  63
  64                         /* Make the thread runnable: */
  65                         PTHREAD_NEW_STATE(joiner, PS_RUNNING);
  66
  67                         /* Set the return value for the woken thread: */
  68                         joiner->join_status.error = ESRCH;
  69                         joiner->join_status.ret = NULL;
  70                         joiner->join_status.thread = NULL;
  71
  72                         /*
  73                          * Disconnect the joiner from the thread being detached:
  74                          */
  75                         pthread->joiner = NULL;
  76                 }
  77
  78                 /*
  79                  * Undefer and handle pending signals, yielding if a
  80                  * scheduling signal occurred while in the critical region.
  81                  */
  82                 _thread_kern_sig_undefer();
  83         } else
  84                 /* Return an error: */
  85                 rval = EINVAL;
  86
  87         /* Return the completion status: */
  88         return (rval);
  89 }
  90
  91 __strong_reference(_pthread_detach, pthread_detach);