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-rw-r--r--nptl_db/structs.def3
-rw-r--r--nptl_db/td_ta_thr_iter.c65
-rw-r--r--nptl_db/td_thr_validate.c26
3 files changed, 70 insertions, 24 deletions
diff --git a/nptl_db/structs.def b/nptl_db/structs.def
index f5559ccb06..75da95a36e 100644
--- a/nptl_db/structs.def
+++ b/nptl_db/structs.def
@@ -1,5 +1,5 @@
/* List of types and symbols in libpthread examined by libthread_db.
- Copyright (C) 2003, 2006, 2007 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2006, 2007, 2008 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
@@ -27,6 +27,7 @@ DB_STRUCT (pthread)
DB_STRUCT_FIELD (pthread, list)
DB_STRUCT_FIELD (pthread, report_events)
DB_STRUCT_FIELD (pthread, tid)
+DB_STRUCT_FIELD (pthread, pid)
DB_STRUCT_FIELD (pthread, start_routine)
DB_STRUCT_FIELD (pthread, cancelhandling)
DB_STRUCT_FIELD (pthread, schedpolicy)
diff --git a/nptl_db/td_ta_thr_iter.c b/nptl_db/td_ta_thr_iter.c
index c82f39cb78..9a594ed1d8 100644
--- a/nptl_db/td_ta_thr_iter.c
+++ b/nptl_db/td_ta_thr_iter.c
@@ -1,5 +1,5 @@
/* Iterate over a process's threads.
- Copyright (C) 1999,2000,2001,2002,2003,2004,2007
+ Copyright (C) 1999,2000,2001,2002,2003,2004,2007,2008
Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
@@ -25,7 +25,7 @@
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)
+ psaddr_t head, bool fake_empty, pid_t match_pid)
{
td_err_e err;
psaddr_t next, ofs;
@@ -78,28 +78,48 @@ iterate_thread_list (td_thragent_t *ta, td_thr_iter_f *callback,
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);
+ /* Verify that this thread's pid field matches the child PID.
+ If its pid field is negative, it's about to do a fork or it
+ is the sole thread in a fork child. */
+ psaddr_t pid;
+ err = DB_GET_FIELD_LOCAL (pid, ta, copy, pthread, pid, 0);
+ if (err == TD_OK && (pid_t) (uintptr_t) pid < 0)
+ {
+ if (-(pid_t) (uintptr_t) pid == match_pid)
+ /* It is about to do a fork, but is really still the parent PID. */
+ pid = (psaddr_t) (uintptr_t) match_pid;
+ else
+ /* It must be a fork child, whose new PID is in the tid field. */
+ err = DB_GET_FIELD_LOCAL (pid, ta, copy, pthread, tid, 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)
+ if ((pid_t) (uintptr_t) pid == match_pid)
{
- /* 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;
+ 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. */
@@ -135,17 +155,18 @@ td_ta_thr_iter (const td_thragent_t *ta_arg, td_thr_iter_f *callback,
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);
+ 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);
+ list, false, pid);
return err;
}
diff --git a/nptl_db/td_thr_validate.c b/nptl_db/td_thr_validate.c
index 9a77250d48..adcde3c87e 100644
--- a/nptl_db/td_thr_validate.c
+++ b/nptl_db/td_thr_validate.c
@@ -1,5 +1,6 @@
/* Validate a thread handle.
- Copyright (C) 1999,2001,2002,2003,2004,2007 Free Software Foundation, Inc.
+ Copyright (C) 1999,2001,2002,2003,2004,2007,2008
+ Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
@@ -81,5 +82,28 @@ td_thr_validate (const td_thrhandle_t *th)
err = TD_OK;
}
+ if (err == TD_OK)
+ {
+ /* Verify that this is not a stale element in a fork child. */
+ pid_t match_pid = ps_getpid (th->th_ta_p->ph);
+ psaddr_t pid;
+ err = DB_GET_FIELD (pid, th->th_ta_p, th->th_unique, pthread, pid, 0);
+ if (err == TD_OK && (pid_t) (uintptr_t) pid < 0)
+ {
+ /* This was a thread that was about to fork, or it is the new sole
+ thread in a fork child. In the latter case, its tid was stored
+ via CLONE_CHILD_SETTID and so is already the proper child PID. */
+ if (-(pid_t) (uintptr_t) pid == match_pid)
+ /* It is about to do a fork, but is really still the parent PID. */
+ pid = (psaddr_t) (uintptr_t) match_pid;
+ else
+ /* It must be a fork child, whose new PID is in the tid field. */
+ err = DB_GET_FIELD (pid, th->th_ta_p, th->th_unique,
+ pthread, tid, 0);
+ }
+ if (err == TD_OK && (pid_t) (uintptr_t) pid != match_pid)
+ err = TD_NOTHR;
+ }
+
return err;
}
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