1: /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3:    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
    4: 
    5:    The GNU C Library is free software; you can redistribute it and/or
    6:    modify it under the terms of the GNU Lesser General Public
    7:    License as published by the Free Software Foundation; either
    8:    version 2.1 of the License, or (at your option) any later version.
    9: 
   10:    The GNU C Library is distributed in the hope that it will be useful,
   11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:    Lesser General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU Lesser General Public
   16:    License along with the GNU C Library; if not, write to the Free
   17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   18:    02111-1307 USA.  */
   19: 
   20: #include <errno.h>
   21: #include "pthreadP.h"
   22: #include <atomic.h>
   23: 
   24: 
   25: int
   26: pthread_detach (th)
   27:      pthread_t th;
   28: {
   29:   struct pthread *pd = (struct pthread *) th;
   30: 
   31:   /* Make sure the descriptor is valid.  */
   32:   if (INVALID_NOT_TERMINATED_TD_P (pd))
   33:     /* Not a valid thread handle.  */
   34:     return ESRCH;
   35: 
   36:   int result = 0;
   37: 
   38:   /* Mark the thread as detached.  */
   39:   if (atomic_compare_and_exchange_bool_acq (&pd->joinid, pd, NULL))
   40:     {
   41:       /* There are two possibilities here.  First, the thread might
   42:          already be detached.  In this case we return EINVAL.
   43:          Otherwise there might already be a waiter.  The standard does
   44:          not mention what happens in this case.  */
   45:       if (IS_DETACHED (pd))
   46:         result = EINVAL;
   47:     }
   48:   else
   49:     /* Check whether the thread terminated meanwhile.  In this case we
   50:        will just free the TCB.  */
   51:     if ((pd->cancelhandling & EXITING_BITMASK) != 0)
   52:       /* Note that the code in __free_tcb makes sure each thread
   53:          control block is freed only once.  */
   54:       __free_tcb (pd);
   55: 
   56:   return result;
   57: }