diff options
Diffstat (limited to 'include/linux/percpu-rwsem.h')
| -rw-r--r-- | include/linux/percpu-rwsem.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/include/linux/percpu-rwsem.h b/include/linux/percpu-rwsem.h new file mode 100644 index 000000000..3e88c9a7d --- /dev/null +++ b/include/linux/percpu-rwsem.h @@ -0,0 +1,34 @@ +#ifndef _LINUX_PERCPU_RWSEM_H +#define _LINUX_PERCPU_RWSEM_H + +#include <linux/atomic.h> +#include <linux/rwsem.h> +#include <linux/percpu.h> +#include <linux/wait.h> +#include <linux/lockdep.h> + +struct percpu_rw_semaphore { + unsigned int __percpu *fast_read_ctr; + atomic_t write_ctr; + struct rw_semaphore rw_sem; + atomic_t slow_read_ctr; + wait_queue_head_t write_waitq; +}; + +extern void percpu_down_read(struct percpu_rw_semaphore *); +extern void percpu_up_read(struct percpu_rw_semaphore *); + +extern void percpu_down_write(struct percpu_rw_semaphore *); +extern void percpu_up_write(struct percpu_rw_semaphore *); + +extern int __percpu_init_rwsem(struct percpu_rw_semaphore *, + const char *, struct lock_class_key *); +extern void percpu_free_rwsem(struct percpu_rw_semaphore *); + +#define percpu_init_rwsem(brw) \ +({ \ + static struct lock_class_key rwsem_key; \ + __percpu_init_rwsem(brw, #brw, &rwsem_key); \ +}) + +#endif |