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systemc-forum - Re: [Systemc-forum] Quickthreads problems on Linux platform using Pthrea Message Thread: Previous | Next
  • To: "Carey, Patrick" <patrick.carey@xxxxxxxxx>
  • From: "Ballance, Matt" <matt_ballance@xxxxxxxxxxx>
  • Date: Wed, 04 Feb 2004 09:42:49 -0800
  • Cc: systemc-forum@xxxxxxxxxxx
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    I have run into this issue, but not with SystemC specifically. 
    The details are that the Linux pthread library uses the current
stack-pointer to determine which thread (pthread) is currently
executing. When the stack pointer is within the user-thread's malloc'd
stack block, the pthread lib isn't able to determine which pthread is
currently running. Usually this causes a crash.
    I believe that glibc/pthreads can be configured to use a processor
register for threadId rather than the stack pointer. I haven't fully
explored this approach, since in my application I cannot require a
custom glibc...
    The workaround that I eventually applied was to allocate all
user-thread stacks from the main application stack. For you, this would
entail customizing the SystemC library to use your own stack
allocator...

    Hope this is helpful...

-Matthew

On Wed, 2004-02-04 at 08:40, Carey, Patrick wrote:
> Has anyone had any success in getting SystemC threads (SC_THREADS) to
> work on top of a system running Pthreads on Linux?  I know from the
> past few years that there was an issue with the Linux Pthread library
> in its handling of certain pointers on the stack that causes errors
> with malloc.  We have a validation system where the base executable is
> running Pthreads and this program kicks off other tools, one of which
> is a SystemC design that has test threads in it.  The test threads seg
> fault with malloc due to the incompatibility described above.  Does
> anyone know if it is possible to reimplement the Pthreads library or
> any other workaround so these two thread systems can coexist?
> 
> Thanks,
> Patrick Carey
-- 
Matt Ballance <matt_ballance@xxxxxxxxxxx>
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