Mathieu Lacage <mathieu.lac...@sophia.inria.fr> writes: > 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 would use option 2. There could also be a hook function, along the lines of std::set_terminate. Ian
