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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (c) 2015, Linaro Limited
*/
#ifndef __KERNEL_WAIT_QUEUE_H
#define __KERNEL_WAIT_QUEUE_H
#include <tee_api_types.h>
#include <types_ext.h>
#include <sys/queue.h>
struct wait_queue_elem;
SLIST_HEAD(wait_queue, wait_queue_elem);
#define WAIT_QUEUE_INITIALIZER { .slh_first = NULL }
struct condvar;
struct wait_queue_elem {
short handle;
bool done;
bool wait_read;
struct condvar *cv;
SLIST_ENTRY(wait_queue_elem) link;
};
/*
* Initializes a wait queue
*/
void wq_init(struct wait_queue *wq);
/*
* Initializes a wait queue element and adds it to the wait queue. This
* function is supposed to be called before the lock that protects the
* resource we need to wait for is released.
*
* One call to this function must be followed by one call to wq_wait_final()
* on the same wait queue element.
*/
void wq_wait_init_condvar(struct wait_queue *wq, struct wait_queue_elem *wqe,
struct condvar *cv, bool wait_read);
static inline void wq_wait_init(struct wait_queue *wq,
struct wait_queue_elem *wqe, bool wait_read)
{
wq_wait_init_condvar(wq, wqe, NULL, wait_read);
}
/* Waits for the wait queue element to be awakened or timed out */
TEE_Result wq_wait_final(struct wait_queue *wq, struct wait_queue_elem *wqe,
uint32_t timeout_ms, const void *sync_obj,
const char *fname, int lineno);
/* Wakes up the first wait queue element in the wait queue, if there is one */
void wq_wake_next(struct wait_queue *wq, const void *sync_obj,
const char *fname, int lineno);
/* Returns true if the wait queue doesn't contain any elements */
bool wq_is_empty(struct wait_queue *wq);
void wq_promote_condvar(struct wait_queue *wq, struct condvar *cv,
bool only_one, const void *sync_obj, const char *fname,
int lineno);
bool wq_have_condvar(struct wait_queue *wq, struct condvar *cv);
#endif /*__KERNEL_WAIT_QUEUE_H*/
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