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The argument of "hundreds of threads" is a red herring. The
address space available to each thread typically doesn't
depend on the number of threads. Instead, the stack size is
pre-determined, so it's vice versa: the number of threads
supported depends on that stack-size, which (currently)
isn't tunable. Also, stack space is typically a scarce
resource only for recursive functions. For leave functions,
it doesn't matter, unless a single function consumes the
majority of the stack (which certainly wouldn't be the case
here).

Allocation on the stack is cheap, and over-allocation
doesn't hurt. Please change the patch to use automatic
variables. It will become simpler and more maintainable that
way (in addition, it should also become minimally faster).