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glibc/linuxthreads_db/td_ta_thr_iter.c
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/* Iterate over a process's threads. | |
Copyright (C) 1999, 2000, 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" | |
#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 (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; | |
} |