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* [Bug gdb/31521] New: Can't set watchpoints when current thread is running
@ 2024-03-21 15:50 pedro at palves dot net
2024-03-21 15:51 ` [Bug gdb/31521] " pedro at palves dot net
0 siblings, 1 reply; 2+ messages in thread
From: pedro at palves dot net @ 2024-03-21 15:50 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=31521
Bug ID: 31521
Summary: Can't set watchpoints when current thread is running
Product: gdb
Version: unknown
Status: NEW
Severity: normal
Priority: P2
Component: gdb
Assignee: unassigned at sourceware dot org
Reporter: pedro at palves dot net
Target Milestone: ---
Currently, when the current thread is running, you can print global variables.
However, if you try to set a watchpoint on the same globals, GDB errors out,
complaining that the selected thread is running. Like so:
(gdb) c&
Continuing.
(gdb) p global
$1 = 1098377287
(gdb) watch global
Selected thread is running.
I have a patch that makes setting the watchpoint work. You'll get instead:
(gdb) c&
Continuing.
(gdb) [New Thread 0x7ffff7d6e640 (LWP 434993)]
[New Thread 0x7ffff756d640 (LWP 434994)]
p global
$1 = 88168
(gdb) watch global
Hardware watchpoint 2: global
(gdb) [Switching to Thread 0x7ffff7d6e640 (LWP 434993)]
Thread 2 "function0" hit Hardware watchpoint 2: global
Old value = 185420
New value = 185423
int_return () at threads.c:39
39 }
Software watchpoints require more fixing, as the succesfully set sw watchpoint
doesn't fire. GDB needs to force the running-free thread to pause and switch
to single-stepping to make that work. Software watchpoints have general design
issues with multi-threading, though, so that's just yet another issue for the
pile.
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* [Bug gdb/31521] Can't set watchpoints when current thread is running
2024-03-21 15:50 [Bug gdb/31521] New: Can't set watchpoints when current thread is running pedro at palves dot net
@ 2024-03-21 15:51 ` pedro at palves dot net
0 siblings, 0 replies; 2+ messages in thread
From: pedro at palves dot net @ 2024-03-21 15:51 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=31521
Pedro Alves <pedro at palves dot net> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at sourceware dot org |pedro at palves dot net
--- Comment #1 from Pedro Alves <pedro at palves dot net> ---
Got patch.
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2024-03-21 15:50 [Bug gdb/31521] New: Can't set watchpoints when current thread is running pedro at palves dot net
2024-03-21 15:51 ` [Bug gdb/31521] " pedro at palves dot net
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