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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;
}
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