/* Copyright (C) 2002, 2003 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #include <errno.h> #include "pthreadP.h" #include <atomic.h> int pthread_detach (pthread_t th) { struct pthread *pd = (struct pthread *) th; /* Make sure the descriptor is valid. */ if (INVALID_NOT_TERMINATED_TD_P (pd)) /* Not a valid thread handle. */ return ESRCH; int result = 0; /* Mark the thread as detached. */ if (atomic_compare_and_exchange_bool_acq (&pd->joinid, pd, NULL)) { /* There are two possibilities here. First, the thread might already be detached. In this case we return EINVAL. Otherwise there might already be a waiter. The standard does not mention what happens in this case. */ if (IS_DETACHED (pd)) result = EINVAL; } else /* Check whether the thread terminated meanwhile. In this case we will just free the TCB. */ if ((pd->cancelhandling & EXITING_BITMASK) != 0) /* Note that the code in __free_tcb makes sure each thread control block is freed only once. */ __free_tcb (pd); return result; }