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glibc  2.9
pthread_detach.c
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00001 /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include "pthreadP.h"
00022 #include <atomic.h>
00023 
00024 
00025 int
00026 pthread_detach (th)
00027      pthread_t th;
00028 {
00029   struct pthread *pd = (struct pthread *) th;
00030 
00031   /* Make sure the descriptor is valid.  */
00032   if (INVALID_NOT_TERMINATED_TD_P (pd))
00033     /* Not a valid thread handle.  */
00034     return ESRCH;
00035 
00036   int result = 0;
00037 
00038   /* Mark the thread as detached.  */
00039   if (atomic_compare_and_exchange_bool_acq (&pd->joinid, pd, NULL))
00040     {
00041       /* There are two possibilities here.  First, the thread might
00042         already be detached.  In this case we return EINVAL.
00043         Otherwise there might already be a waiter.  The standard does
00044         not mention what happens in this case.  */
00045       if (IS_DETACHED (pd))
00046        result = EINVAL;
00047     }
00048   else
00049     /* Check whether the thread terminated meanwhile.  In this case we
00050        will just free the TCB.  */
00051     if ((pd->cancelhandling & EXITING_BITMASK) != 0)
00052       /* Note that the code in __free_tcb makes sure each thread
00053         control block is freed only once.  */
00054       __free_tcb (pd);
00055 
00056   return result;
00057 }