/* Copyright (C) 2002, 2003, 2006 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 attribute_protected __pthread_key_create ( pthread_key_t *key, void (*destr) (void *)) { /* Find a slot in __pthread_kyes which is unused. */ size_t cnt; for (cnt = 0; cnt < PTHREAD_KEYS_MAX; ++cnt) { uintptr_t seq = __pthread_keys[cnt].seq; if (KEY_UNUSED (seq) && KEY_USABLE (seq) /* We found an unused slot. Try to allocate it. */ && ! atomic_compare_and_exchange_bool_acq (&__pthread_keys[cnt].seq, seq + 1, seq)) { /* Remember the destructor. */ __pthread_keys[cnt].destr = destr; /* Return the key to the caller. */ *key = cnt; /* The call succeeded. */ return 0; } } return EAGAIN; } strong_alias (__pthread_key_create, pthread_key_create) strong_alias (__pthread_key_create, __pthread_key_create_internal)