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Re: gdb-6.6 mingw port hangs after Ctrl-C
- From: Roland Puntaier <Roland dot Puntaier at br-automation dot com>
- To: gdb at sourceware dot org
- Date: Wed, 22 Aug 2007 13:10:07 +0200
- Subject: Re: gdb-6.6 mingw port hangs after Ctrl-C
> Christopher Faylor:
> You can stop another thread with a "SuspendThread()" call and you can
> cause the thread to resume in another location with a "ResumeThread()"
> by changing the EIP that is passed to it. However, if you do that while
> you are in the middle of a low-level Windows function which, say, holds
> a mutex, then you are going to eventually run into problems.
I wanted to try this with the following changes in remoted.c,
but I could'nt find a way to get the EIP of the new address, i.e.
"continueHere:".
How could that be done?
#include <windows.h>//Added
static HANDLE h_main_thread = 0;//Added
static void
interrupt_query (void)
{
target_terminal_ours ();
if (query ("Interrupted while waiting for the program.\n\
Give up (and stop debugging it)? "))
{
target_mourn_inferior ();
if (h_main_thread){//Added
CONTEXT threadContext;//Added
SuspendThread(h_main_thread);//Added
GetThreadContext(h_main_thread,&threadContext);//Added
threadContext.Eip = &continueHere;//Added and wished it would work
SetThreadContext(h_main_thread,&threadContext);//Added
ResumeThread(h_main_thread);//Added
ExitThread(0);//Added
}//Added
continueHere://Added and wished it would work
deprecated_throw_reason (RETURN_QUIT);
}
target_terminal_inferior ();
}
...
static ptid_t
remote_wait (ptid_t ptid, struct target_waitstatus *status)
{
...
h_main_thread=GetCurrentThread();//Added
ofunc = signal (SIGINT, remote_interrupt);
getpkt (&rs->buf, &rs->buf_size, 1);
signal (SIGINT, ofunc);
h_main_thread=0;//Added
....
> Christopher Faylor:
> You'd need to use overlapped I/O for those situations. If you do that
> then you'd have to decide whether you want gdb to work on Windows 9x/Me
> or not.
This seems less brute force:
WSARecv(), WSAWaitForMultipleEvents() instead of recv()
and let WSAWaitForMultipleEvents() return through an event signaled in
interrupt_query()
and if that event happened, continue calling deprecated_throw_reason
(RETURN_QUIT); this time from the main thread.