1 41b3e8b9 2020-01-20 rsc #include "threadimpl.h"
 2 41b3e8b9 2020-01-20 rsc 
 3 41b3e8b9 2020-01-20 rsc void
 4 41b3e8b9 2020-01-20 rsc makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
 5 41b3e8b9 2020-01-20 rsc {
 6 41b3e8b9 2020-01-20 rsc 	int *sp;
 7 41b3e8b9 2020-01-20 rsc 
 8 41b3e8b9 2020-01-20 rsc 	sp = USPALIGN(ucp, 4);
 9 41b3e8b9 2020-01-20 rsc 	sp -= argc;
10 41b3e8b9 2020-01-20 rsc 	memmove(sp, &argc+1, argc*sizeof(int));
11 41b3e8b9 2020-01-20 rsc 	*--sp = 0;		/* return address */
12 41b3e8b9 2020-01-20 rsc 	ucp->uc_mcontext.mc_eip = (long)func;
13 41b3e8b9 2020-01-20 rsc 	ucp->uc_mcontext.mc_esp = (int)sp;
14 41b3e8b9 2020-01-20 rsc }
15 41b3e8b9 2020-01-20 rsc 
16 41b3e8b9 2020-01-20 rsc int
17 41b3e8b9 2020-01-20 rsc swapcontext(ucontext_t *oucp, ucontext_t *ucp)
18 41b3e8b9 2020-01-20 rsc {
19 41b3e8b9 2020-01-20 rsc 	if(getcontext(oucp) == 0)
20 41b3e8b9 2020-01-20 rsc 		setcontext(ucp);
21 41b3e8b9 2020-01-20 rsc 	return 0;
22 41b3e8b9 2020-01-20 rsc }