1 // Mutual exclusion lock. 2 struct spinlock { 3 uint locked; // Is the lock held? 4 5 // For debugging: 6 char *name; // Name of lock. 7 int cpu; // The number of the cpu holding the lock. 8 uint pcs[10]; // The call stack (an array of program counters) 9 // that locked the lock. 10 }; 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 // Blank page. 55