1 /* wait queue for multiple threads on kernel objects */
2 
3 /*
4  * Copyright (c) 2015 Wind River Systems, Inc.
5  *
6  * SPDX-License-Identifier: Apache-2.0
7  */
8 
9 #ifndef ZEPHYR_KERNEL_INCLUDE_WAIT_Q_H_
10 #define ZEPHYR_KERNEL_INCLUDE_WAIT_Q_H_
11 
12 #include <kernel_structs.h>
13 #include <sys/dlist.h>
14 #include <sys/rb.h>
15 #include <kernel/sched_priq.h>
16 #include <timeout_q.h>
17 
18 #ifdef __cplusplus
19 extern "C" {
20 #endif
21 
22 #ifdef CONFIG_WAITQ_SCALABLE
23 
24 #define _WAIT_Q_FOR_EACH(wq, thread_ptr) \
25 	RB_FOR_EACH_CONTAINER(&(wq)->waitq.tree, thread_ptr, base.qnode_rb)
26 
z_waitq_init(_wait_q_t * w)27 static inline void z_waitq_init(_wait_q_t *w)
28 {
29 	w->waitq = (struct _priq_rb) {
30 		.tree = {
31 			.lessthan_fn = z_priq_rb_lessthan
32 		}
33 	};
34 }
35 
z_waitq_head(_wait_q_t * w)36 static inline struct k_thread *z_waitq_head(_wait_q_t *w)
37 {
38 	return (struct k_thread *)rb_get_min(&w->waitq.tree);
39 }
40 
41 #else /* !CONFIG_WAITQ_SCALABLE: */
42 
43 #define _WAIT_Q_FOR_EACH(wq, thread_ptr) \
44 	SYS_DLIST_FOR_EACH_CONTAINER(&((wq)->waitq), thread_ptr, \
45 				     base.qnode_dlist)
46 
47 static inline void z_waitq_init(_wait_q_t *w)
48 {
49 	sys_dlist_init(&w->waitq);
50 }
51 
52 static inline struct k_thread *z_waitq_head(_wait_q_t *w)
53 {
54 	return (struct k_thread *)sys_dlist_peek_head(&w->waitq);
55 }
56 
57 #endif /* !CONFIG_WAITQ_SCALABLE */
58 
59 #ifdef __cplusplus
60 }
61 #endif
62 
63 #endif /* ZEPHYR_KERNEL_INCLUDE_WAIT_Q_H_ */
64