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#ifndef LITMUS_FIFO_H
#define LITMUS_FIFO_H
#include <litmus/litmus.h>
#include <litmus/binheap.h>
#include <litmus/locking.h>
/* struct for semaphore with priority inheritance */
struct fifo_mutex {
struct litmus_lock litmus_lock;
/* current resource holder */
struct task_struct *owner;
/* highest-priority waiter */
struct task_struct *hp_waiter;
/* FIFO queue of waiting tasks -- for now. time stamp in the future. */
wait_queue_head_t wait;
/* we do some nesting within spinlocks, so we can't use the normal
sleeplocks found in wait_queue_head_t. */
raw_spinlock_t lock;
};
static inline struct fifo_mutex* fifo_mutex_from_lock(struct litmus_lock* lock)
{
return container_of(lock, struct fifo_mutex, litmus_lock);
}
#ifdef CONFIG_LITMUS_DGL_SUPPORT
int fifo_mutex_is_owner(struct litmus_lock *l, struct task_struct *t);
int fifo_mutex_dgl_lock(struct litmus_lock *l, dgl_wait_state_t* dgl_wait, wait_queue_t* wq_node);
void fifo_mutex_enable_priority(struct litmus_lock *l, dgl_wait_state_t* dgl_wait);
#endif
void fifo_mutex_propagate_increase_inheritance(struct litmus_lock* l,
struct task_struct* t,
raw_spinlock_t* to_unlock,
unsigned long irqflags);
void fifo_mutex_propagate_decrease_inheritance(struct litmus_lock* l,
struct task_struct* t,
raw_spinlock_t* to_unlock,
unsigned long irqflags);
int fifo_mutex_lock(struct litmus_lock* l);
int fifo_mutex_unlock(struct litmus_lock* l);
int fifo_mutex_close(struct litmus_lock* l);
void fifo_mutex_free(struct litmus_lock* l);
struct litmus_lock* fifo_mutex_new(struct litmus_lock_ops*);
#endif
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