how to turn off multithreading gdb execution - c++

Question

I really like to use some simple interface like in Borland C++, thereby I've installed cygwin with gcc/gdb/vim etc on my laptop(unfortunately, I can not install Linux here :( )
The problem that I have is following: when I try to debug non-parallized program, f.e:
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv) {
int i = argc;
fprintf(stdout, "Hello World %d\n", i);
return 0;
}
my gdb hangs:
$ gdb a.exe
GNU gdb (GDB) 7.3.50.20111026-cvs (cygwin-special)
...
Reading symbols from /cygdrive/c/programming/temp/a.exe...done.
(gdb) b main
Breakpoint 1 at 0x401179: file helloworld.cpp, line 4.
(gdb) r
Starting program: /cygdrive/c/programming/temp/a.exe
**[New Thread 12132.0x11a4]
[New Thread 12132.0x32ac]**
Breakpoint 1, main (argc=1, argv=0x28ac60) at helloworld.cpp:4
4 int main(int argc, char **argv) {
(gdb) n
5 int i = argc;
(gdb)
6 fprintf(stdout, "Hello World %d\n", i);
(gdb) p i
$1 = 1
(gdb) n
.......... nothing here
I cannot terminate this debugging by C-C, C-Z or killing.
I think gdb hangs, because it tries to use 2 threads and something goes wrong. Here is info threads:
(gdb) info threads
Id Target Id Frame
2 Thread 10160.0x31e8 0x775cf8e5 in ntdll!RtlUpdateClonedSRWLock () from /cygdrive/c/Windows/system32/ntdll.dll
* 1 Thread 10160.0x15a8 main (argc=1, argv=0x28ac60) at helloworld.cpp:4
For me, that's pretty strange, that 1-thread program is executed on 2 threads. I've checked gdb on Linux and gdb there uses 1 thread.
My question is: can I say to gdb to use only 1 thread anyhow?
BTW, I didn't have same problem before until I've updated my laptop and cygwin. I tried to rollback gdb(7.3.50 actually is the oldest one that cygwin suggests), but it doesn't help.
Thank you