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/* Map thread ID to thread handle. 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_ta_map_id2thr (const td_thragent_t *ta, pthread_t pt, td_thrhandle_t *th) { struct pthread_handle_struct phc; struct _pthread_descr_struct pds; int pthread_threads_max; LOG ("td_ta_map_id2thr"); /* Test whether the TA parameter is ok. */ if (! ta_ok (ta)) return TD_BADTA; /* Make the following expression a bit smaller. */ pthread_threads_max = ta->pthread_threads_max; /* We can compute the entry in the handle array we want. */ if (ps_pdread (ta->ph, ta->handles + pt % pthread_threads_max, &phc, sizeof (struct pthread_handle_struct)) != PS_OK) return TD_ERR; /* XXX Other error value? */ /* Test whether this entry is in use. */ if (phc.h_descr == NULL) { if (pt % pthread_threads_max == 0) { /* The initial thread always exists but the thread library might not yet be initialized. */ th->th_ta_p = (td_thragent_t *) ta; th->th_unique = NULL; return TD_OK; } return TD_BADTH; } /* Next test: get the descriptor to see whether this is not an old thread handle. */ if (ps_pdread (ta->ph, phc.h_descr, &pds, sizeof (struct _pthread_descr_struct)) != PS_OK) return TD_ERR; /* XXX Other error value? */ if (pds.p_tid != pt) return TD_BADTH; if (pds.p_terminated != 0) return TD_NOTHR; /* Create the `td_thrhandle_t' object. */ th->th_ta_p = (td_thragent_t *) ta; th->th_unique = phc.h_descr; return TD_OK; } |