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From: Kevin Pouget <kevin.pouget@gmail.com>
Date: Tue, 31 May 2011 13:52:00 -0000
Message-ID: <BANLkTimGZ3DSbkRts1Oc8_ZyrAG3hi7PzA@mail.gmail.com>
Subject: Python and target-async
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Hello,

I'm facing a problem with Python not behaving correctly when
"target-async" is on. I'll report it in the bugtracker if someone else
confirms the problem:

(replace PID by any process ID to which you can attach)

> (gdb) set target-async on
> (gdb) py gdb.execute("attach PID") ; gdb.execute("where")
> 0x0000003cbd0aa47e in waitpid () from /lib64/libc.so.6
> #0 =A00x0000003cbd0aa47e in waitpid () from /lib64/libc.so.6
> #1 =A00x000000000043ede2 in ?? ()
> #2 =A00x000000000044005f in wait_for ()
> #3 =A00x0000000000430c45 in execute_command_internal ()
> #4 =A00x0000000000430e0e in execute_command ()
> #5 =A00x000000000041d526 in reader_loop ()
> #6 =A00x000000000041ccde in main ()
> (gdb) detach
> Detaching from program ...
> (gdb) set target-async on
> (gdb) py gdb.execute("attach PID") ; gdb.execute("where")
> #0 =A00x0000003cbd0aa47e in ?? ()
> #1 =A00x0000000000000000 in ?? ()
> 0x0000003cbd0aa47e in waitpid () from /lib64/libc.so.6

--> the inferior can't be access normally

the problem lies in the fact that GDB doesn't return from Python
between the `attach' and the `where', (the situation occurs during a
Python function calls as well).

> (gdb) set target-async on
> (gdb) py gdb.execute("attach PID")
> (gdb) py gdb.execute("where")

works correctly.


I'm not sure there is something I can do to solve it, any idea what I
should look for?


thanks,

Kevin