Outline ![]()
Files ![]()
loading...
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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** ThreadX Component */
/** */
/** Thread */
/** */
/**************************************************************************/
/**************************************************************************/
#define TX_SOURCE_CODE
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_trace.h"
#include "tx_thread.h"
#ifndef TX_NO_TIMER
#include "tx_timer.h"
#endif
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_thread_relinquish PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function moves the currently executing thread to the end of */
/* the list of threads ready at the same priority. If no other threads */
/* of the same or higher priority are ready, this function simply */
/* returns. */
/* */
/* INPUT */
/* */
/* None */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _tx_thread_system_return Return to the system */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
VOID _tx_thread_relinquish(VOID)
{
TX_INTERRUPT_SAVE_AREA
UINT priority;
TX_THREAD *thread_ptr;
/* Pickup thread pointer. */
TX_THREAD_GET_CURRENT(thread_ptr)
#ifdef TX_ENABLE_STACK_CHECKING
/* Check this thread's stack. */
TX_THREAD_STACK_CHECK(thread_ptr)
#endif
/* Disable interrupts. */
TX_DISABLE
#ifndef TX_NO_TIMER
/* Reset time slice for current thread. */
_tx_timer_time_slice = thread_ptr -> tx_thread_new_time_slice;
#endif
/* Pickup the thread's priority. */
priority = thread_ptr -> tx_thread_priority;
/* Determine if there is another thread at the same priority. */
if (thread_ptr -> tx_thread_ready_next != thread_ptr)
{
/* Yes, there is another thread at this priority, make it the highest at
this priority level. */
_tx_thread_priority_list[priority] = thread_ptr -> tx_thread_ready_next;
/* Mark the new thread as the one to execute. */
_tx_thread_execute_ptr = thread_ptr -> tx_thread_ready_next;
}
/* Determine if there is a higher-priority thread ready. */
if (_tx_thread_highest_priority < priority)
{
/* Yes, there is a higher priority thread ready to execute. Make
it visible to the thread scheduler. */
_tx_thread_execute_ptr = _tx_thread_priority_list[_tx_thread_highest_priority];
/* No need to clear the preempted bit in this case, since the currently running
thread must already have its preempted bit clear. */
}
/* If trace is enabled, insert this event into the trace buffer. */
TX_TRACE_IN_LINE_INSERT(TX_TRACE_THREAD_RELINQUISH, &thread_ptr, TX_POINTER_TO_ULONG_CONVERT(_tx_thread_execute_ptr), 0, 0, TX_TRACE_THREAD_EVENTS)
/* Log this kernel call. */
TX_EL_THREAD_RELINQUISH_INSERT
/* Restore previous interrupt posture. */
TX_RESTORE
/* Determine if this thread needs to return to the system. */
if (_tx_thread_execute_ptr != thread_ptr)
{
#ifdef TX_THREAD_ENABLE_PERFORMANCE_INFO
/* Increment the number of thread relinquishes. */
thread_ptr -> tx_thread_performance_relinquish_count++;
/* Increment the total number of thread relinquish operations. */
_tx_thread_performance_relinquish_count++;
/* Increment the non-idle return count. */
_tx_thread_performance_non_idle_return_count++;
#endif
#ifdef TX_ENABLE_STACK_CHECKING
/* Pickup the next execute pointer. */
thread_ptr = _tx_thread_execute_ptr;
/* Check this thread's stack. */
TX_THREAD_STACK_CHECK(thread_ptr)
#endif
/* Transfer control to the system so the scheduler can execute
the next thread. */
_tx_thread_system_return();
}
}