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Date: Wed, 17 Jul 2013 16:13:00 -0000
From: Richard Braun <rbraun@sceen.net>
To: Yue Lu <hacklu.newborn@gmail.com>
Cc: Luis Machado <lgustavo@codesourcery.com>, gdb@sourceware.org,	bug-hurd@gnu.org, Thomas Schwinge <thomas@codesourcery.com>
Subject: Re: how to continue from a breakpoint in GNU/Hurd
Message-ID: <20130717161348.GA14402@dalaran.sceen.net>
References: <CAB8fV=i04n-eHTxP=7hWRkB7O1VJobvrMc5KSHOX0SkJ3vuqhQ@mail.gmail.com> <51E5785D.1050904@codesourcery.com> <CAB8fV=iuUFiNtoU-Trw_GnujMW1REMj2=ZciR=36RDJx1+8wSQ@mail.gmail.com> <51E58223.5040505@codesourcery.com> <CAB8fV=jnOcYCGmQ_emcoE0ZYH6MjT3K3a1P8=svRR+nKSMD69A@mail.gmail.com> <20130717120954.GA26158@dalaran.sceen.net> <CAB8fV=hvso0fYxZwm11DTYaZeGrdaMG9nzE04G1G-TbR6wyDOw@mail.gmail.com>
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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 ?

> something maybe wrong, but the err is zero.

Something does look wrong. Check all the parameters of your call, one
by one, rigorously.

-- 
Richard Braun