On Fri, 2009-02-27 at 08:54 -0800, Ian Lance Taylor wrote: > > It would be totally awesome to do this if you could provide an option to > > delegate to a user-provided function the allocation and deallocation of > > the stack blobs needed by threads. > > Yes, this would be a goal.
The main reason I asked about this is that it is not obvious to me how this could be done: yes, you can call any function from your compiler-generated code but, what would the user need to do to change which address is called ? 1) specify a function name for allocation on the command-line during compilation and link statically into every binary an object file which contains the specified symbol ? This would allow you to have one allocation function per generated binary (shared library or executable) which might not be very desirable from a user-perspective. 2) generate code which uses a well-known name, calls this symbol through the PLT (on ELF systems), and, relies on the ELF loader to resolve that symbol in each binary to a single user-provided function. The libc could provide its own default implementation which is overridden either with LD_PRELOAD or by linking the function into the main executable. I don't care much about which option is chosen but it would be nice to know how you intend to deal with this aspect of the project. Mathieu
