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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;
}
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