5 * 'Big Reader' read-write spinlocks. See linux/brlock.h for details.
7 * Copyright 2000, Ingo Molnar <mingo@redhat.com>
8 * Copyright 2000, David S. Miller <davem@redhat.com>
11 #include <linux/config.h>
15 #include <linux/sched.h>
16 #include <linux/brlock.h>
18 brlock_read_lock_t __brlock_array[NR_CPUS][__BR_IDX_MAX] =
19 { [0 ... NR_CPUS-1] = { [0 ... __BR_IDX_MAX-1] = 0 } };
21 struct br_wrlock __br_write_locks[__BR_IDX_MAX] =
22 { [0 ... __BR_IDX_MAX-1] = { SPIN_LOCK_UNLOCKED } };
24 void fastcall __br_write_lock (enum brlock_indices idx)
29 spin_lock(&__br_write_locks[idx].lock);
30 for (i = 0; i < smp_num_cpus; i++)
31 if (__brlock_array[cpu_logical_map(i)][idx] != 0) {
32 spin_unlock(&__br_write_locks[idx].lock);
39 void fastcall __br_write_unlock (enum brlock_indices idx)
41 spin_unlock(&__br_write_locks[idx].lock);
44 #endif /* CONFIG_SMP */