diff options
Diffstat (limited to 'REORG.TODO/nptl_db/td_ta_thr_iter.c')
| -rw-r--r-- | REORG.TODO/nptl_db/td_ta_thr_iter.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/REORG.TODO/nptl_db/td_ta_thr_iter.c b/REORG.TODO/nptl_db/td_ta_thr_iter.c new file mode 100644 index 0000000000..cc3d1e7611 --- /dev/null +++ b/REORG.TODO/nptl_db/td_ta_thr_iter.c @@ -0,0 +1,150 @@ +/* Iterate over a process's threads. + Copyright (C) 1999-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.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" + + +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, pid_t match_pid) +{ + 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. */ + + pid_t pid = ps_getpid (ta->ph); + err = DB_GET_SYMBOL (list, ta, __stack_user); + if (err == TD_OK) + err = iterate_thread_list (ta, callback, cbdata_p, state, ti_pri, + list, true, pid); + + /* And the threads with stacks allocated by the implementation. */ + if (err == TD_OK) + err = DB_GET_SYMBOL (list, ta, stack_used); + if (err == TD_OK) + err = iterate_thread_list (ta, callback, cbdata_p, state, ti_pri, + list, false, pid); + + return err; +} |