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/* Which thread is running on an lwp? 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_lwp2thr (const td_thragent_t *ta, lwpid_t lwpid, td_thrhandle_t *th) { int pthread_threads_max = ta->pthread_threads_max; size_t sizeof_descr = ta->sizeof_descr; struct pthread_handle_struct phc[pthread_threads_max]; size_t cnt; #ifdef ALL_THREADS_STOPPED int num; #else # define num 1 #endif LOG ("td_ta_map_lwp2thr"); /* Test whether the TA parameter is ok. */ if (! ta_ok (ta)) return TD_BADTA; /* Read all the descriptors. */ if (ps_pdread (ta->ph, ta->handles, phc, sizeof (struct pthread_handle_struct) * pthread_threads_max) != PS_OK) return TD_ERR; /* XXX Other error value? */ #ifdef ALL_THREADS_STOPPED /* Read the number of currently active threads. */ if (ps_pdread (ta->ph, ta->pthread_handles_num, &num, sizeof (int)) != PS_OK) return TD_ERR; /* XXX Other error value? */ #endif /* Get the entries one after the other and find out whether the ID matches. */ for (cnt = 0; cnt < pthread_threads_max && num > 0; ++cnt) if (phc[cnt].h_descr != NULL) { struct _pthread_descr_struct pds; #ifdef ALL_THREADS_STOPPED /* First count this active thread. */ --num; #endif if (ps_pdread (ta->ph, phc[cnt].h_descr, &pds, sizeof_descr) != PS_OK) return TD_ERR; /* XXX Other error value? */ if ((pds.p_pid ?: ps_getpid (ta->ph)) == lwpid) { /* Found it. Now fill in the `td_thrhandle_t' object. */ th->th_ta_p = (td_thragent_t *) ta; th->th_unique = phc[cnt].h_descr; return TD_OK; } } else if (cnt == 0) { /* The initial thread always exists. But it might not yet be initialized. Construct a value. */ th->th_ta_p = (td_thragent_t *) ta; th->th_unique = NULL; return TD_OK; } return TD_NOLWP; } |