gist:840611

struct spinlock s;
int doomsday = 0;

doomsday_thr() {
   for (;;) {
   	spin_lock(&s);
   	while (doomsday == 0) {
   		tsleep_interlock(BADNESS, 0);
   		spin_unlock(&s);
   		tsleep(BADNESS, PINTERLOCK, "waiting-for-end", 0);

gist:840601

struct spinlock s;
int doomsday = 0;

doomsday_thr() {
   for (;;) {
   	spin_lock(&s);
   	while (doomsday == 0) {
   		spin_unlock(&s);
   		/* XXX */
   		tsleep(BADNESS, 0, "waiting-for-end", 0);