diff options
Diffstat (limited to 'libpthread/nptl/pthread_key_create.c')
| -rw-r--r-- | libpthread/nptl/pthread_key_create.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/libpthread/nptl/pthread_key_create.c b/libpthread/nptl/pthread_key_create.c new file mode 100644 index 000000000..3744c08ad --- /dev/null +++ b/libpthread/nptl/pthread_key_create.c @@ -0,0 +1,54 @@ +/* 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include "pthreadP.h" +#include <atomic.h> + + +int +__pthread_key_create ( + pthread_key_t *key, + void (*destr) (void *)) +{ + /* Find a slot in __pthread_kyes which is unused. */ + for (size_t 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) |