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 extern int getmcontext(mcontext_t*);
17 extern int setmcontext(mcontext_t*);
18 
19 int
20 getcontext(ucontext_t *uc)
21 {
22 	return getmcontext(&uc->uc_mcontext);
23 }
24 
25 void
26 setcontext(ucontext_t *uc)
27 {
28 	setmcontext(&uc->uc_mcontext);
29 }
30 
31 int
32 swapcontext(ucontext_t *oucp, ucontext_t *ucp)
33 {
34 	if(getcontext(oucp) == 0)
35 		setcontext(ucp);
36 	return 0;
37 }
38