wait_q.h

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/* wait queue for multiple threads on kernel objects */
 
/*
 * Copyright (c) 2015 Wind River Systems, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_KERNEL_INCLUDE_WAIT_Q_H_
#define ZEPHYR_KERNEL_INCLUDE_WAIT_Q_H_
 
#include <kernel_structs.h>
#include <sys/dlist.h>
#include <sys/rb.h>
#include <kernel/sched_priq.h>
#include <timeout_q.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#ifdef CONFIG_WAITQ_SCALABLE
 
#define _WAIT_Q_FOR_EACH(wq, thread_ptr) \
        RB_FOR_EACH_CONTAINER(&(wq)->waitq.tree, thread_ptr, base.qnode_rb)
 
static inline void z_waitq_init(_wait_q_t *w)
{
        w->waitq = (struct _priq_rb) {
                .tree = {
                        .lessthan_fn = z_priq_rb_lessthan
                }
        };
}
 
static inline struct k_thread *z_waitq_head(_wait_q_t *w)
{
        return (struct k_thread *)rb_get_min(&w->waitq.tree);
}
 
#else /* !CONFIG_WAITQ_SCALABLE: */
 
#define _WAIT_Q_FOR_EACH(wq, thread_ptr) \
        SYS_DLIST_FOR_EACH_CONTAINER(&((wq)->waitq), thread_ptr, \
                                     base.qnode_dlist)
 
static inline void z_waitq_init(_wait_q_t *w)
{
        sys_dlist_init(&w->waitq);
}
 
static inline struct k_thread *z_waitq_head(_wait_q_t *w)
{
        return (struct k_thread *)sys_dlist_peek_head(&w->waitq);
}
 
#endif /* !CONFIG_WAITQ_SCALABLE */
 
#ifdef __cplusplus
}
#endif
 
#endif /* ZEPHYR_KERNEL_INCLUDE_WAIT_Q_H_ */