2007-10-02 Mark Mitchell <mark@codesourcery.com>

	* mingw-hdep.c (gdb_select): Stop helper threads before returning.
	* ser-mingw.c (enum select_thread_state): New type.
	(struct ser_console_state): Add have_started and thread_state.
	(select_thread_wait): New function.
	(thread_fn_type): New type.
	(create_select_thread): New function.
	(destroy_select_thread): Likewise.
	(start_select_thread): Likewise.
	(stop_select_thread): Likewise.
	(console_select_thread): Use new functions.
	(pipe_select_thread): Likewise.
	(file_select_thread): Likewise.
	(ser_console_wait_handle): Likewise.
	(ser_console_done_wait_handle): Likewise.
	(ser_console_close): Likewise.
	(free_pipe_state): Likewise.
	(pipe_wait_handle): Likewise.
	(pipe_done_wait_handle): Likewise.
	(struct net_windows_state): Derive from ser_console_state.
	(net_windows_select_thread): Use new functions.
	(net_windows_wait_handle): Likewise.
	(net_windows_done_wait_handle): Likewise.
	(net_windows_close): Likewise.