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