glibc/nptl_db/td_ta_thr_iter.c
Siddhesh Poyarekar 30891f35fa Remove "Contributed by" lines
We stopped adding "Contributed by" or similar lines in sources in 2012
in favour of git logs and keeping the Contributors section of the
glibc manual up to date.  Removing these lines makes the license
header a bit more consistent across files and also removes the
possibility of error in attribution when license blocks or files are
copied across since the contributed-by lines don't actually reflect
reality in those cases.

Move all "Contributed by" and similar lines (Written by, Test by,
etc.) into a new file CONTRIBUTED-BY to retain record of these
contributions.  These contributors are also mentioned in
manual/contrib.texi, so we just maintain this additional record as a
courtesy to the earlier developers.

The following scripts were used to filter a list of files to edit in
place and to clean up the CONTRIBUTED-BY file respectively.  These
were not added to the glibc sources because they're not expected to be
of any use in future given that this is a one time task:

https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc
https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2021-09-03 22:06:44 +05:30

149 lines
4.6 KiB
C

/* Iterate over a process's threads.
Copyright (C) 1999-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://www.gnu.org/licenses/>. */
#include "thread_dbP.h"
static td_err_e
iterate_thread_list (td_thragent_t *ta, td_thr_iter_f *callback,
void *cbdata_p, td_thr_state_e state, int ti_pri,
psaddr_t head, bool fake_empty)
{
td_err_e err;
psaddr_t next, ofs;
void *copy;
/* Test the state.
XXX This is incomplete. Normally this test should be in the loop. */
if (state != TD_THR_ANY_STATE)
return TD_OK;
err = DB_GET_FIELD (next, ta, head, list_t, next, 0);
if (err != TD_OK)
return err;
if (next == 0 && fake_empty)
{
/* __pthread_initialize_minimal has not run. There is just the main
thread to return. We cannot rely on its thread register. They
sometimes contain garbage that would confuse us, left by the
kernel at exec. So if it looks like initialization is incomplete,
we only fake a special descriptor for the initial thread. */
td_thrhandle_t th = { ta, 0 };
return callback (&th, cbdata_p) != 0 ? TD_DBERR : TD_OK;
}
/* Cache the offset from struct pthread to its list_t member. */
err = DB_GET_FIELD_ADDRESS (ofs, ta, 0, pthread, list, 0);
if (err != TD_OK)
return err;
if (ta->ta_sizeof_pthread == 0)
{
err = _td_check_sizeof (ta, &ta->ta_sizeof_pthread, SYM_SIZEOF_pthread);
if (err != TD_OK)
return err;
}
copy = __alloca (ta->ta_sizeof_pthread);
while (next != head)
{
psaddr_t addr, schedpolicy, schedprio;
addr = next - (ofs - (psaddr_t) 0);
if (next == 0 || addr == 0) /* Sanity check. */
return TD_DBERR;
/* Copy the whole descriptor in once so we can access the several
fields locally. Excess copying in one go is much better than
multiple ps_pdread calls. */
if (ps_pdread (ta->ph, addr, copy, ta->ta_sizeof_pthread) != PS_OK)
return TD_ERR;
err = DB_GET_FIELD_LOCAL (schedpolicy, ta, copy, pthread,
schedpolicy, 0);
if (err != TD_OK)
break;
err = DB_GET_FIELD_LOCAL (schedprio, ta, copy, pthread,
schedparam_sched_priority, 0);
if (err != TD_OK)
break;
/* Now test whether this thread matches the specified conditions. */
/* Only if the priority level is as high or higher. */
int descr_pri = ((uintptr_t) schedpolicy == SCHED_OTHER
? 0 : (uintptr_t) schedprio);
if (descr_pri >= ti_pri)
{
/* Yep, it matches. Call the callback function. */
td_thrhandle_t th;
th.th_ta_p = (td_thragent_t *) ta;
th.th_unique = addr;
if (callback (&th, cbdata_p) != 0)
return TD_DBERR;
}
/* Get the pointer to the next element. */
err = DB_GET_FIELD_LOCAL (next, ta, copy + (ofs - (psaddr_t) 0), list_t,
next, 0);
if (err != TD_OK)
break;
}
return err;
}
td_err_e
td_ta_thr_iter (const td_thragent_t *ta_arg, 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)
{
td_thragent_t *const ta = (td_thragent_t *) ta_arg;
td_err_e err;
psaddr_t list = 0;
LOG ("td_ta_thr_iter");
/* Test whether the TA parameter is ok. */
if (! ta_ok (ta))
return TD_BADTA;
/* The thread library keeps two lists for the running threads. One
list contains the thread which are using user-provided stacks
(this includes the main thread) and the other includes the
threads for which the thread library allocated the stacks. We
have to iterate over both lists separately. We start with the
list of threads with user-defined stacks. */
err = __td_ta_stack_user (ta, &list);
if (err == TD_OK)
err = iterate_thread_list (ta, callback, cbdata_p, state, ti_pri,
list, true);
/* And the threads with stacks allocated by the implementation. */
if (err == TD_OK)
err = __td_ta_stack_used (ta, &list);
if (err == TD_OK)
err = iterate_thread_list (ta, callback, cbdata_p, state, ti_pri,
list, false);
return err;
}