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Re: Updated patch for Bug 13217 - thread apply all detach throws a SEGFAULT
- From: ali_anwar <ali_anwar at codesourcery dot com>
- To: Tom Tromey <tromey at redhat dot com>
- Cc: <gdb-patches at sourceware dot org>
- Date: Tue, 11 Dec 2012 20:36:57 +0500
- Subject: Re: Updated patch for Bug 13217 - thread apply all detach throws a SEGFAULT
- References: <5062EA9B.1060505@codesourcery.com> <871uhnwkf3.fsf@fleche.redhat.com> <50C62BBB.6010404@codesourcery.com> <87hantek1p.fsf@fleche.redhat.com>
On 12/11/2012 01:20 AM, Tom Tromey wrote:
"Ali" == ali anwar <ali_anwar@codesourcery.com> writes:
Ali> + if (thread_count ())
Ali> + {
Ali> + struct thread_info tp_array [thread_count ()];
You can't use variable-length arrays in gdb.
Probably xmalloc and a cleanup is your best option here.
Removed the array, now using xmalloc and xfree.
Ali> + for(k = 0; k != i; k++)
Space between 'for' and '('.
Added a space.
Ali> + switch_to_thread ((&tp_array [k])->ptid);
No space before '['. This occurs in a couple places.
Removed a space.
Tom
Thanks for the review. PFA the modified patch.
Regards,
-Ali
Index: ChangeLog
===================================================================
RCS file: /cvs/src/src/gdb/ChangeLog,v
retrieving revision 1.14894
diff -u -r1.14894 ChangeLog
--- ChangeLog 9 Dec 2012 18:39:57 -0000 1.14894
+++ ChangeLog 11 Dec 2012 15:26:11 -0000
@@ -1,3 +1,9 @@
+2012-12-10 Ali Anwar <ali_anwar@codesourcery.com>
+
+ PR threads/13217
+ * thread.c (thread_apply_all_command): Check for valid threads
+ and thread count.
+
2012-12-09 Jan Kratochvil <jan.kratochvil@redhat.com>
* configure.ac (CC_HAS_LONG_LONG): Replace by AC_MSG_ERROR.
Index: thread.c
===================================================================
RCS file: /cvs/src/src/gdb/thread.c,v
retrieving revision 1.149
diff -u -r1.149 thread.c
--- thread.c 27 Jul 2012 00:52:36 -0000 1.149
+++ thread.c 11 Dec 2012 15:31:52 -0000
@@ -1178,7 +1178,6 @@
static void
thread_apply_all_command (char *cmd, int from_tty)
{
- struct thread_info *tp;
struct cleanup *old_chain;
char *saved_cmd;
@@ -1193,18 +1192,32 @@
execute_command. */
saved_cmd = xstrdup (cmd);
make_cleanup (xfree, saved_cmd);
- for (tp = thread_list; tp; tp = tp->next)
- if (thread_alive (tp))
- {
- switch_to_thread (tp->ptid);
-
- printf_filtered (_("\nThread %d (%s):\n"),
- tp->num, target_pid_to_str (inferior_ptid));
- execute_command (cmd, from_tty);
- strcpy (cmd, saved_cmd); /* Restore exact command used
- previously. */
- }
+ if (thread_count ())
+ {
+ struct thread_info *tp_array;
+ struct thread_info *tp;
+ int i, k;
+
+ /* Save a copy of the thread_list in case we execute detach
+ command. */
+ tp_array = xmalloc (sizeof (struct thread_info) * thread_count ());
+ for (i = 0, tp = thread_list; tp; i++, tp = tp->next)
+ tp_array[i] = *tp;
+
+ for (k = 0; k != i; k++)
+ if (thread_alive (&tp_array[k]))
+ {
+ switch_to_thread ((&tp_array[k])->ptid);
+
+ printf_filtered (_("\nThread %d (%s):\n"),
+ (&tp_array[k])->num, target_pid_to_str (inferior_ptid));
+ execute_command (cmd, from_tty);
+ strcpy (cmd, saved_cmd); /* Restore exact command used
+ previously. */
+ }
+ xfree (tp_array);
+ }
do_cleanups (old_chain);
}
Index: testsuite/gdb.threads/threadapply.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.threads/threadapply.exp,v
retrieving revision 1.15
diff -u -r1.15 threadapply.exp
--- testsuite/gdb.threads/threadapply.exp 26 Jun 2012 19:23:20 -0000 1.15
+++ testsuite/gdb.threads/threadapply.exp 11 Dec 2012 15:26:20 -0000
@@ -63,3 +63,4 @@
gdb_test "up" ".*in main.*" "go up in the stack frame"
gdb_test "thread apply all print 1" "Thread ..*\\\$\[0-9]+ = 1.*Thread ..*\\\$\[0-9]+ = 1.*Thread ..*\\\$\[0-9]+ = 1.*Thread ..*\\\$\[0-9]+ = 1.*Thread ..*\\\$\[0-9]+ = 1.*Thread ..*\\\$\[0-9]+ = 1" "run a simple print command on all threads"
gdb_test "down" "#0.*thread_function.*" "go down and check selected frame"
+gdb_test "thread apply all detach" "Detaching from.*" "detach all threads"