Re: [Boost-bugs] [Boost C++ Libraries] #12592: Wrongly aligned bottom stack address

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #12592: Wrongly aligned bottom stack address
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-01-22 18:21:23

#12592: Wrongly aligned bottom stack address
-------------------------------------------------+-------------------------
  Reporter:  Christian Maaser                    |      Owner:  olli
  <runningwithscythes@…>                         |     Status:  closed
      Type:  Bugs                                |  Component:  context
 Milestone:  To Be Determined                    |   Severity:  Problem
   Version:  Boost 1.62.0                        |   Keywords:
Resolution:  worksforme                          |
-------------------------------------------------+-------------------------
Changes (by olli):

 * status:  new => closed
 * resolution:   => worksforme

Comment:

 I've had to look at this bug report in more detail:

 The bottom stack is correctly aligned (16-byte) - the problem is that

    execution_context<int> source([](execution_context<int> sink, int)

 Uses the 'fixedsize_stack' with a default size of 64kB. That means that in
 best case you get an segmentation fault if you excceed the stack size
 (allocating 7 arrays on the stack).

 Windows does not provide segemented (on demand growing) stacks.

 If you use the 'protected_fixedsize_stack' you get an guard page appended.
 If you access memory fro m that page you get an 'stack overflow' exception
 (tested):

     execution_context<int> source(
               std::allocator_arg, protected_fixedsize_stack( 64*1024),
              [](execution_context<int> sink, int)

 In your case you used the fixedsize_stack with a stack size of 64kb, which
 seams too small for your use case.

 So, I close this bug as 'works for me'.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/12592#comment:5>
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