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glibc/linuxthreads_db/td_ta_map_id2thr.c
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/* Map thread ID to thread handle. | |
Copyright (C) 1999, 2001 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, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#include "thread_dbP.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) | |
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; | |
} |