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/* Iterate over a process's threads.
Copyright (C) 1999,2000,2001,2002,2003 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>
#include <alloca.h>
static int
handle_descr (const td_thragent_t *ta, td_thr_iter_f *callback,
void *cbdata_p, td_thr_state_e state, int ti_pri,
size_t cnt, pthread_descr descr)
{
struct _pthread_descr_struct pds;
size_t sizeof_descr = ta->sizeof_descr;
td_thrhandle_t th;
if (descr == NULL)
{
/* No descriptor (yet). */
if (cnt == 0)
{
/* This is the main thread. Create a fake descriptor. */
memset (&pds, '\0', sizeof (pds));
/* Empty thread descriptor the thread library would create. */
#if !defined __UCLIBC_HAS_TLS__ || !TLS_DTV_AT_TP
pds.p_header.data.self = &pds;
#endif
pds.p_nextlive = pds.p_prevlive = &pds;
pds.p_tid = PTHREAD_THREADS_MAX;
/* The init code also sets up p_lock, p_errnop, p_herrnop, and
p_userstack but this should not be necessary here. */
th.th_ta_p = (td_thragent_t *) ta;
th.th_unique = NULL;
if (callback (&th, cbdata_p) != 0)
return TD_DBERR;
/* All done successfully. */
return TD_OK;
}
else if (cnt == 1)
/* The manager is not yet started. No big deal. */
return TD_OK;
else
/* For every other thread this should not happen. */
return TD_ERR;
}
if (ps_pdread (ta->ph, descr, &pds, sizeof_descr) != PS_OK)
return TD_ERR; /* XXX Other error value? */
/* The manager thread must be handled special. The descriptor
exists but the thread only gets created when the first
`pthread_create' call is issued. A clear indication that this
happened is when the p_pid field is non-zero. */
if (cnt == 1 && pds.p_pid == 0)
return TD_OK;
/* Now test whether this thread matches the specified
conditions. */
/* Only if the priority level is as high or higher. */
if (pds.p_priority < ti_pri)
return TD_OK;
/* Test the state.
XXX This is incomplete. */
if (state != TD_THR_ANY_STATE)
return TD_OK;
/* XXX For now we ignore threads which are not running anymore.
The reason is that gdb tries to get the registers and fails.
In future we should have a special mode of the thread library
in which we keep the process around until the actual join
operation happened. */
if (pds.p_exited != 0)
return TD_OK;
/* Yep, it matches. Call the callback function. */
th.th_ta_p = (td_thragent_t *) ta;
th.th_unique = descr;
if (callback (&th, cbdata_p) != 0)
return TD_DBERR;
/* All done successfully. */
return TD_OK;
}
td_err_e
td_ta_thr_iter (const td_thragent_t *ta, td_thr_iter_f *callback,
void *cbdata_p, td_thr_state_e state, int ti_pri,
sigset_t *ti_sigmask_p, unsigned int ti_user_flags)
{
int pthread_threads_max;
struct pthread_handle_struct *phc;
td_err_e result = TD_OK;
int cnt;
#ifdef ALL_THREADS_STOPPED
int num;
#else
# define num 1
#endif
LOG ("td_ta_thr_iter");
/* Test whether the TA parameter is ok. */
if (! ta_ok (ta))
return TD_BADTA;
pthread_threads_max = ta->pthread_threads_max;
phc = (struct pthread_handle_struct *) alloca (sizeof (phc[0])
* pthread_threads_max);
/* First read only the main thread and manager thread information. */
if (ps_pdread (ta->ph, ta->handles, phc,
sizeof (struct pthread_handle_struct) * 2) != PS_OK)
return TD_ERR; /* XXX Other error value? */
/* Now handle these descriptors. */
result = handle_descr (ta, callback, cbdata_p, state, ti_pri, 0,
phc[0].h_descr);
if (result != TD_OK)
return result;
result = handle_descr (ta, callback, cbdata_p, state, ti_pri, 1,
phc[1].h_descr);
if (result != TD_OK)
return result;
/* Read all the descriptors. */
if (ps_pdread (ta->ph, ta->handles + 2, &phc[2],
(sizeof (struct pthread_handle_struct)
* (pthread_threads_max - 2))) != 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
/* Now get all descriptors, one after the other. */
for (cnt = 2; cnt < pthread_threads_max && num > 0; ++cnt)
if (phc[cnt].h_descr != NULL)
{
#ifdef ALL_THREADS_STOPPED
/* First count this active thread. */
--num;
#endif
result = handle_descr (ta, callback, cbdata_p, state, ti_pri, cnt,
phc[cnt].h_descr);
if (result != TD_OK)
break;
}
return result;
}
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