src/libthread/386-ucontext.c


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#include "threadimpl.h"

void
makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
{
	int *sp;

	sp = USPALIGN(ucp, 4);
	sp -= argc;
	memmove(sp, &argc+1, argc*sizeof(int));
	*--sp = 0;		/* return address */
	ucp->uc_mcontext.mc_eip = (long)func;
	ucp->uc_mcontext.mc_esp = (int)sp;
}

int
swapcontext(ucontext_t *oucp, ucontext_t *ucp)
{
	if(getcontext(oucp) == 0)
		setcontext(ucp);
	return 0;
}