1 #include "threadimpl.h"
2 
3 void
4 makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
5 {
6 	int *sp;
7 
8 	sp = (int*)ucp->uc_stack.ss_sp+ucp->uc_stack.ss_size/4;
9 	sp -= argc;
10 	memmove(sp, &argc+1, argc*sizeof(int));
11 	*--sp = 0;		/* return address */
12 	ucp->uc_mcontext.mc_eip = (long)func;
13 	ucp->uc_mcontext.mc_esp = (int)sp;
14 }
15 
16 int
17 swapcontext(ucontext_t *oucp, ucontext_t *ucp)
18 {
19 	if(getcontext(oucp) == 0)
20 		setcontext(ucp);
21 	return 0;
22 }
23