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/******************************************************************************
* wait.h
*
* Sleep in hypervisor context for some event to occur.
*
* Copyright (c) 2010, Keir Fraser <keir@xen.org>
*/
#ifndef __XEN_WAIT_H__
#define __XEN_WAIT_H__
#include <xen/types.h>
#include <xen/list.h>
#include <xen/spinlock.h>
struct waitqueue_head {
spinlock_t lock;
struct list_head list;
};
/* Statically define and initialise a waitqueue. */
#define DEFINE_WAITQUEUE_HEAD(name) \
struct waitqueue_head name = { \
.lock = SPIN_LOCK_UNLOCKED, \
.list = LIST_HEAD_INIT((name).list) \
}
/* Dynamically initialise/destroy a waitqueue. */
void init_waitqueue_head(struct waitqueue_head *wq);
void destroy_waitqueue_head(struct waitqueue_head *wq);
/* Wake VCPU(s) waiting on specified waitqueue. */
void wake_up_nr(struct waitqueue_head *wq, unsigned int nr);
void wake_up_one(struct waitqueue_head *wq);
void wake_up_all(struct waitqueue_head *wq);
/* Wait on specified waitqueue until @condition is true. */
#define wait_event(wq, condition) \
do { \
if ( condition ) \
break; \
for ( ; ; ) { \
prepare_to_wait(&wq); \
if ( condition ) \
break; \
wait(); \
} \
finish_wait(&wq); \
} while (0)
/* Private functions. */
int init_waitqueue_vcpu(struct vcpu *v);
void destroy_waitqueue_vcpu(struct vcpu *v);
void prepare_to_wait(struct waitqueue_head *wq);
void wait(void);
void finish_wait(struct waitqueue_head *wq);
void check_wakeup_from_wait(void);
#endif /* __XEN_WAIT_H__ */
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