Re: lua_resume and a C-function as the main coroutine function problem

[Tony Finch <dot@...>]

On Wed, 14 Apr 2010, Robert G. Jakabosky wrote:
>
> Using the jmp_buf hacks or assembly code, allows the program to allocate the
> stacks using malloc() or mmap().

You can use alloca() or C99 variable-length arrays to move the stack to
the heap. For example (assuming the stack grows downwards),

	#define STACKSIZE (16*1024)
	#define SLOP 16

	void newstack(void f(void)) {
		vois *osp = &f;
		void *nsp = malloc(STACKSIZE) + STACKSIZE - SLOP;
		void *dummy = alloca(osp - nsp);
		f(); // runs with its stack on the heap
	}

alloca() is just a way of subtracting some number from the stack pointer.

Tony.
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