diff options
Diffstat (limited to 'nptl/pthread_setspecific.c')
| -rw-r--r-- | nptl/pthread_setspecific.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/nptl/pthread_setspecific.c b/nptl/pthread_setspecific.c new file mode 100644 index 0000000000..5af6cae83e --- /dev/null +++ b/nptl/pthread_setspecific.c @@ -0,0 +1,91 @@ +/* Copyright (C) 2002 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 <stdlib.h> +#include "pthreadP.h" + + +int +__pthread_setspecific (key, value) + pthread_key_t key; + const void *value; +{ + struct pthread *self; + unsigned int idx1st; + unsigned int idx2nd; + struct pthread_key_data *level2; + unsigned int seq; + + self = THREAD_SELF; + + /* Special case access to the first 2nd-level block. This is the + usual case. */ + if (__builtin_expect (key < PTHREAD_KEY_2NDLEVEL_SIZE, 1)) + { + /* Verify the key is sane. */ + if (KEY_UNUSED ((seq = __pthread_keys[key].seq))) + /* Not valid. */ + return EINVAL; + + level2 = &self->specific_1stblock[key]; + } + else + { + if (KEY_UNUSED ((seq = __pthread_keys[key].seq)) + || key >= PTHREAD_KEYS_MAX) + /* Not valid. */ + return EINVAL; + + idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE; + idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE; + + /* This is the second level array. Allocate it if necessary. */ + level2 = THREAD_GETMEM_NC (self, specific[idx1st]); + if (level2 == NULL) + { + if (value == NULL) + /* We don't have to do anything. The value would in any case + be NULL. We can save the memory allocation. */ + return 0; + + level2 + = (struct pthread_key_data *) calloc (PTHREAD_KEY_2NDLEVEL_SIZE, + sizeof (*level2)); + if (level2 == NULL) + return ENOMEM; + + THREAD_SETMEM_NC (self, specific[idx1st], level2); + } + + /* Pointer to the right array element. */ + level2 = &level2[idx2nd]; + } + + /* Store the data and the sequence number so that we can recognize + stale data. */ + level2->seq = seq; + level2->data = (void *) value; + + /* Remember that we stored at least one set of data. */ + THREAD_SETMEM (self, specific_used, true); + + return 0; +} +strong_alias (__pthread_setspecific, pthread_setspecific) |