lib/libthread_xu/thread/thr_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  * $DragonFly: src/lib/libthread_xu/thread/thr_detach.c,v 1.4 2006/04/06 13:03:09 davidxu Exp $
  33  */
  34
  35 #include "namespace.h"
  36 #include <machine/tls.h>
  37
  38 #include <errno.h>
  39 #include <pthread.h>
  40 #include "un-namespace.h"
  41
  42 #include "thr_private.h"
  43
  44 int
  45 _pthread_detach(pthread_t pthread)
  46 {
  47         struct pthread *curthread = tls_get_curthread();
  48         int rval;
  49
  50         if (pthread == NULL)
  51                 return (EINVAL);
  52
  53         THREAD_LIST_LOCK(curthread);
  54         if ((rval = _thr_find_thread(curthread, pthread,
  55                         /*include dead*/1)) != 0) {
  56                 THREAD_LIST_UNLOCK(curthread);
  57                 return (rval);
  58         }
  59
  60         /* Check if the thread is already detached or has a joiner. */
  61         if ((pthread->tlflags & TLFLAGS_DETACHED) != 0 ||
  62             (pthread->joiner != NULL)) {
  63                 THREAD_LIST_UNLOCK(curthread);
  64                 return (EINVAL);
  65         }
  66
  67         /* Flag the thread as detached. */
  68         pthread->tlflags |= TLFLAGS_DETACHED;
  69         if (pthread->state == PS_DEAD)
  70                 THR_GCLIST_ADD(pthread);
  71         THREAD_LIST_UNLOCK(curthread);
  72
  73         return (0);
  74 }
  75
  76 __strong_reference(_pthread_detach, pthread_detach);