/* Get a thread-specific data pointer for a thread. Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999. 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 "thread_dbP.h" #include <linuxthreads/internals.h> td_err_e td_thr_tsd (const td_thrhandle_t *th, const thread_key_t tk, void **data) { struct _pthread_descr_struct pds; struct pthread_key_struct *keys = th->th_ta_p->keys; struct pthread_key_struct key; int pthread_keys_max = th->th_ta_p->pthread_keys_max; int pthread_key_2ndlevel_size = th->th_ta_p->pthread_key_2ndlevel_size; unsigned int idx1st; unsigned int idx2nd; void *p; LOG ("td_thr_tsd"); /* If there is no thread descriptor there cannot be any thread specific data. */ if (th->th_unique == NULL) return TD_BADKEY; /* Get the thread descriptor. */ if (ps_pdread (th->th_ta_p->ph, th->th_unique, &pds, sizeof (struct _pthread_descr_struct)) != PS_OK) return TD_ERR; /* XXX Other error value? */ /* Check correct value of key. */ if (tk >= pthread_keys_max) return TD_BADKEY; /* Get the key entry. */ if (ps_pdread (th->th_ta_p->ph, &keys[tk], &key, sizeof (struct pthread_key_struct)) != PS_OK) return TD_ERR; /* XXX Other error value? */ /* Fail if this key is not at all used. */ if (! key.in_use) return TD_BADKEY; /* Compute the indeces. */ idx1st = tk / pthread_key_2ndlevel_size; idx2nd = tk % pthread_key_2ndlevel_size; /* Check the pointer to the second level array. */ if (pds.p_specific[idx1st] == NULL) return TD_NOTSD; /* Now get the real key. XXX I don't know whether it's correct but there is currently no easy way to determine whether a key was never set or the value is NULL. We return an error whenever the value is NULL. */ if (ps_pdread (th->th_ta_p->ph, &pds.p_specific[idx1st][idx2nd], &p, sizeof (void *)) != PS_OK) return TD_ERR; if (p != NULL) *data = p; return p != NULL ? TD_OK : TD_NOTSD; }