Re: [PATCH with testcase] Bug 11568 - delete thread-specific breakpoint on the thread exit

Muhammad Waqas
2013-07-30T10:34:08Z

On 07/29/2013 07:17 PM, Yao Qi wrote:
> On 07/29/2013 07:42 PM, Muhammad Waqas wrote:
>
> Please have a look at
> http://sourceware.org/gdb/wiki/ContributionChecklist , it is very
> helpful for you to avoid some issues in your patch.
>
>> 2013-07-24 Muhammad Waqas<mwaqas@codesourcery.com>
> ^^^ Two spaces.
>
>>
>> PR gdb/11568
>> * breakpoint.c (breakpoint_auto_delete): add new condition
>> Remove thread related breakpoints if threads are exited.
> ^^^^^^^ Tab instead of spaces.
>
> The changelog entry is like this:
>
> PR gdb/11568
> * breakpoint.c (breakpoint_auto_delete): Remove thread related
> breakpoints if threads are exited.
>
>>
>>
>>
>> Index: ./gdb/breakpoint.c
>> ===================================================================
>> RCS file: /cvs/src/src/gdb/breakpoint.c,v
>> retrieving revision 1.772
>> diff -u -p -r1.772 breakpoint.c
>> --- ./gdb/breakpoint.c 6 Jul 2013 07:14:54 -0000 1.772
>> +++ ./gdb/breakpoint.c 29 Jul 2013 11:22:05 -0000
>> @@ -11910,6 +11910,15 @@ breakpoint_auto_delete (bpstat bs)
>> {
>> if (b->disposition == disp_del_at_next_stop)
>> delete_breakpoint (b);
>> + else if (b->thread > 0) /* If breakpoint relates to user created
>> + thread Check if it's not alive then
>> + delete it*/
>
> Please move the comments into the brackets below. Period is missing
> in your comment, and we need two spaces after period at the end of
> comment.
>
>> + {
>> + struct thread_info * tp = find_thread_id (b->thread) ;
>
> A blank line is needed here. Indentation looks wrong here.
>
>> + if (tp != NULL && (tp->state == THREAD_EXITED
>> + || !target_thread_alive (tp->ptid)))
>> + delete_breakpoint (b);
>
> and here.
>
>> + }
>> }
>> }
>>
>
> I run thread-specific-bp.exp in async/non-stop mode, and I get a fail.
> I am afraid your patch only works in all-stop mode.
>
>>
>> testsuite/Changlog
>>
>> 2013-07-29 Muhammad Waqas<mwaqas@codesourcery.com>
>> Jan Kratochvil<jan.kratochvil@redhat.com>
> ^^^^^^^^^^
> Need a tab instead of spaces. Please reference existing entries in
> ChangeLog to see how to list two authors.
>
>>
>> * gdb.threads/thread-specific-bp.c: New file.
>> * gdb.threads/thread-specific-bp.exp: New file.
>
> Please include these new added files into your patch, so that people
> can review them. Here is an example
> (http://sourceware.org/ml/gdb-patches/2013-07/msg00671.html) I include
> new added file in the patch. I use git, but you can get the similar
> patch in cvs.
>
>> # Copyright (C) 1996-2013 Free Software Foundation, Inc.
>
> It should be 2013 only.
>
>> gdb_test_multiple "info breakpoint" "get info" {
>> -re "(\[0-9\]+)(\[^\n\r\]*breakpoint\[^\n\r\]*main.*thread
>> $thre)" {
>
> I don't really understand this pattern. Probably, we only want to
> match "thread $thre"
>
> ".*$gdb_prompt $" is missing at the end of the pattern. Please add it.
>
>> fail "threaded breakpoint not deleted"
>> }
>> -re "(\[0-9\]+)(\[^\n\r\]*breakpoint\[^\n\r\]*main.*\n)" {
>> pass "threaded breakpoint deleted"
>
> fail/pass should be the same.
>
>> }
>> }
>
> Something like this:
>
> set test "thread-specific breakpoint is deleted"
> gdb_test_multiple "info breakpoint" $test {
> -re "thread $thre.*$gdb_prompt $" {
> fail $test
> }
> -re "$gdb_prompt $" {
> pass $test
> }
> }
>
> There are some trailing spaces in the test. Please remove them.
>
Index: ChangeLog
===================================================================
RCS file: /cvs/src/src/ChangeLog,v
retrieving revision 1.1075
diff -u -p -r1.1075 ChangeLog
--- ChangeLog 22 Jul 2013 15:17:20 -0000 1.1075
+++ ChangeLog 30 Jul 2013 10:20:09 -0000
@@ -1,3 +1,9 @@
+2013-07-24 Muhammad Waqas <mwaqas@codesourcery.com>
+
+ PR gdb/11568
+ * breakpoint.c (breakpoint_auto_delete): Remove thread related
+ breakpoints if threads are exited.
+
2013-07-22 Joel Brobecker <brobecker@adacore.com>

* src-release (VER): Use $(TOOL)/common/create-version.sh
Index: gdb/breakpoint.c
===================================================================
RCS file: /cvs/src/src/gdb/breakpoint.c,v
retrieving revision 1.773
diff -u -p -r1.773 breakpoint.c
--- gdb/breakpoint.c 24 Jul 2013 19:50:32 -0000 1.773
+++ gdb/breakpoint.c 30 Jul 2013 10:20:49 -0000
@@ -11941,6 +11941,17 @@ breakpoint_auto_delete (bpstat bs)
{
if (b->disposition == disp_del_at_next_stop)
delete_breakpoint (b);
+ else if (b->thread > 0)
+ {
+ /* If breakpoint relates to user created thread Check if it's
+ not alive then delete it. */
+ struct thread_info *tp = find_thread_id (b->thread);
+
+ if ( tp != NULL && (tp->state == THREAD_EXITED
+ || !target_thread_alive (tp->ptid)))
+ delete_breakpoint(b);
+
+ }
}
}

Problem was with my test case, now It works with async/non-stop mode.

Index: gdb/testsuite/ChangeLog
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/ChangeLog,v
retrieving revision 1.3748
diff -u -p -r1.3748 ChangeLog
--- gdb/testsuite/ChangeLog 26 Jul 2013 18:15:06 -0000 1.3748
+++ gdb/testsuite/ChangeLog 30 Jul 2013 10:21:11 -0000
@@ -1,3 +1,9 @@
+2013-07-24 Muhammad Waqas <mwaqas@codesourccery.com>
+ Jan Kratochvil <jan.kartochvil@redhat.com>
+
+ *gdb.thread/thread-specific-bp.c: Newfile.
+ *gdb.thread/thread-specific-bp.exp: Newfile.
+
2013-07-26 Keith Seitz <keiths@redhat.com>

* gdb.mi/mi-var-child-f.exp: Pass f90 to gdb_compile instead
Index: gdb/testsuite/gdb.threads/thread-specific-bp.exp
===================================================================
RCS file: gdb/testsuite/gdb.threads/thread-specific-bp.exp
diff -N gdb/testsuite/gdb.threads/thread-specific-bp.exp
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ gdb/testsuite/gdb.threads/thread-specific-bp.exp 30 Jul 2013 10:21:24 -0000
@@ -0,0 +1,54 @@
+# Copyright (C) 2013 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# This file was written by Muhammad Waqas <mwaqas@codesourcery.com>
+#
+#This test verfiy that Breakpoint on a spacific thread is deleted
+
+standard_testfile
+
+if {[gdb_compile_pthreads \
+ "${srcdir}/${subdir}/${srcfile}" \
+ "${binfile}" executable {debug} ] != "" } {
+ return -1
+}
+
+clean_restart ${binfile}
+if [runto main] then {
+
+ gdb_breakpoint "start"
+ gdb_continue_to_breakpoint "start"
+ gdb_test_multiple "info threads" "get thread 1 id" {
+ -re "(\[0-9\]+)(\[^\n\r\]*Thread\[^\n\r\]*start.*)($gdb_prompt $)" {
+ pass "thread created"
+ }
+ }
+ # get the id of thread
+ set thre $expect_out(1,string)
+ gdb_breakpoint [gdb_get_line_number "line # 13"]
+ gdb_breakpoint "main thread $thre"
+ gdb_test "info break" ".*breakpoint.*(thread $thre)" "Breakpoint set"
+ gdb_test "thread $thre" "Switching to thread $thre.*" "Thread $thre selected"
+ gdb_continue_to_breakpoint "line # 13"
+ set test "thread-specific breakpoint is deleted"
+ gdb_test_multiple "info breakpoint" $test {
+ -re "thread $thre.*$gdb_prompt $" {
+ fail $test
+ }
+ -re "$gdb_prompt $" {
+ pass $test
+ }
+ }
+}
Index: gdb/testsuite/gdb.threads/thread-specific-bp.c
===================================================================
RCS file: gdb/testsuite/gdb.threads/thread-specific-bp.c
diff -N gdb/testsuite/gdb.threads/thread-specific-bp.c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ gdb/testsuite/gdb.threads/thread-specific-bp.c 30 Jul 2013 10:21:38 -0000
@@ -0,0 +1,34 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2013 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include <stdio.h>
+#include <pthread.h>
+
+static void *
+start (void *arg)
+{
+ return NULL;
+}
+
+int
+main (void)
+{
+ pthread_t thread;
+ pthread_create (&thread, NULL, start, NULL);
+ pthread_join (thread, NULL);
+ return 0; /*line # 13*/
+}