1991/0821/gnot/lock.c (diff list | history)

gnot/lock.c on 1990/03091
1990/03091		#include "u.h" #include "lib.h" #include "mem.h" #include "dat.h" #include "fns.h"
1991/0606		#include "errno.h"
1990/03091
1990/0617		#define PCOFF -1
1990/0403
1990/03091		void lock(Lock *l) { int i;
1991/0821		for(i = 0; i < 1000000; i++){
1991/0723		if (tas(&l->key) == 0){
1991/0820		if(u)
1991/0614		u->p->hasspin = 1;
1991/0723		l->pc = ((ulong*)&l)[PCOFF];
1990/03091		return;
1990/0601		}
1991/0821		if(u && u->p->state == Running) sched();
1991/0723		} i = l->key; l->key = 0; panic("lock loop 0x%lux key 0x%lux pc 0x%lux held by pc 0x%lux\n", l, i, ((ulong*)&l)[PCOFF], l->pc);
1990/03091		} int canlock(Lock *l) {
1991/0723		if(tas(&l->key)) return 0; l->pc = ((ulong*)&l)[PCOFF]; if(u && u->p) u->p->hasspin = 1; return 1;
1990/03091		} void unlock(Lock *l) { l->pc = 0;
1990/0403		l->key = 0;
1991/0614		if(u && u->p) u->p->hasspin = 0;
1991/0606		}