On Thu, Jul 18, 2013 at 12:13 AM, Richard Braun <rbr...@sceen.net> wrote: > On Thu, Jul 18, 2013 at 12:07:20AM +0800, Yue Lu wrote: >> when I used thread_info() to check the suspend count, they are zero. >> But I met a strange thing. >> this is my code snippet: >> thread_basic_info_data_t _info; >> thread_basic_info_t info = &_info; >> mach_msg_type_number_t info_len = THREAD_BASIC_INFO_COUNT; >> error_t err = >> thread_info (thread->port, THREAD_BASIC_INFO, (int *) &info, &info_len); >> >> after this call, the info turn out to be a _NULL_ pointer. I think > > If the info pointer is NULL, how do you determine the suspend count ? > I used this (&_info)->suspend_count to get the sc value.
> Something does look wrong. Check all the parameters of your call, one > by one, rigorously. The only one parameter I used is the first one, I give it as the thread port, something like 119 (I have printf it), the left three parameters are all the same as the code in gnu-nat.c. , -- Yue Lu (陆岳)
