Re: [Boost-users] Assertion in boost::mutex

Subject: Re: [Boost-users] Assertion in boost::mutex
From: amit khandelwal (khandelwal.amit_at_[hidden])
Date: 2008-10-03 17:02:55

I created a sample test harness to use the code that was causing this. It
happens when the program is about to shutdown (at the destruction time).
This text was printed by boost "void boost::mutex::lock(): Assertion
`!pthread_mutex_lock(&m)' failed."

The mutex is not used in the destructor. Below are the details of the exact
frame.

(gdb) fr 4
#4  0x08053631 in ~mutex (this=0x80e5998) at
/inc/boost/thread/pthread/mutex.hpp:45
45                  BOOST_VERIFY(!pthread_mutex_destroy(&m));
(gdb) p m
$1 = {__data = {__lock = 1, __count = 0, __owner = 3470, __kind = 0,
__nusers = 1, {__spins = 0, __list = {__next = 0x0}}},
  __size =
"\001\000\000\000\000\000\000\000\216\r\000\000\000\000\000\000\001\000\000\000\000\000\000",
__align = 1}

Why should it crash the system?

On Fri, Oct 3, 2008 at 4:37 PM, Matthew L. Creech <mlcreech_at_[hidden]>wrote:

> On Fri, Oct 3, 2008 at 3:50 PM, amit khandelwal
> <khandelwal.amit_at_[hidden]> wrote:
> > I am getting an assertion in boost::mutex while using static mutex
> > variables. Below is the stack trace for that.
> >
> > void boost::mutex::lock(): Assertion `!pthread_mutex_lock(&m)' failed.
> >
>
> Was the assertion failure for pthread_mutex_lock(), or
> pthread_mutex_destroy()?  Your assertion message has the former, but
> the back-trace indicates the latter.
>
> Either way, the cause might be static initialization order.  Do you
> have a global object whose destructor makes use (directly, or
> indirectly through any contained classes' destructors) of a mutex
> which is also part of some global object?
>
> --
> Matthew L. Creech
> _______________________________________________
> Boost-users mailing list
> Boost-users_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>

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