blob: f211339548116660413d67985336be9f2fb7613a (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
/**
* @file rtems/score/corerwlock.h
*
* @brief Constants and Structures Associated with the RWLock Handler
*
* This include file contains all the constants and structures associated
* with the RWLock Handler.
*/
/*
* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifndef _RTEMS_SCORE_CORERWLOCK_H
#define _RTEMS_SCORE_CORERWLOCK_H
#include <rtems/score/threadq.h>
/**
* @defgroup ScoreRWLock RWLock Handler
*
* @ingroup Score
*
* This handler encapsulates functionality which provides the foundation
* RWLock services used in all of the APIs supported by RTEMS.
*/
/**@{*/
#ifdef __cplusplus
extern "C" {
#endif
/**
* RWLock State.
*/
typedef enum {
/** This indicates the the RWLock is not currently locked.
*/
CORE_RWLOCK_UNLOCKED,
/** This indicates the the RWLock is currently locked for reading.
*/
CORE_RWLOCK_LOCKED_FOR_READING,
/** This indicates the the RWLock is currently locked for reading.
*/
CORE_RWLOCK_LOCKED_FOR_WRITING
} CORE_RWLock_States;
/**
* The following defines the control block used to manage the
* attributes of each RWLock.
*/
typedef struct {
/** This field indicates XXX.
*/
int XXX;
} CORE_RWLock_Attributes;
/**
* The following defines the control block used to manage each
* RWLock.
*/
typedef struct {
/** This field is the Waiting Queue used to manage the set of tasks
* which are blocked waiting for the RWLock to be released.
*/
Thread_queue_Control Wait_queue;
/** This element is the set of attributes which define this instance's
* behavior.
*/
CORE_RWLock_Attributes Attributes;
/** This element is the current state of the RWLock.
*/
CORE_RWLock_States current_state;
/** This element contains the current number of thread waiting for this
* RWLock to be released. */
uint32_t number_of_readers;
} CORE_RWLock_Control;
/**@}*/
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
|
