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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/*
* Amazon FreeRTOS POSIX V1.1.0
* Copyright (C) 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* http://aws.amazon.com/freertos
* http://www.FreeRTOS.org
*/
/**
* @file FreeRTOS_POSIX_clock.c
* @brief Implementation of clock functions in time.h
*/
/* C standard library includes. */
#include <stddef.h>
#include <string.h>
/* FreeRTOS+POSIX includes. */
#include "FreeRTOS_POSIX.h"
#include "FreeRTOS_POSIX/errno.h"
#include "FreeRTOS_POSIX/time.h"
#include "FreeRTOS_POSIX/utils.h"
/* Declaration of snprintf. The header stdio.h is not included because it
* includes conflicting symbols on some platforms. */
extern int snprintf( char * s,
size_t n,
const char * format,
... );
/*-----------------------------------------------------------*/
clock_t clock( void )
{
/* This function is currently unsupported. It will always return -1. */
return ( clock_t ) -1;
}
/*-----------------------------------------------------------*/
int clock_getcpuclockid( pid_t pid,
clockid_t * clock_id )
{
/* Silence warnings about unused parameters. */
( void ) pid;
( void ) clock_id;
/* This function is currently unsupported. It will always return EPERM. */
return EPERM;
}
/*-----------------------------------------------------------*/
int clock_getres( clockid_t clock_id,
struct timespec * res )
{
/* Silence warnings about unused parameters. */
( void ) clock_id;
/* Convert FreeRTOS tick resolution as timespec. */
if( res != NULL )
{
res->tv_sec = 0;
res->tv_nsec = NANOSECONDS_PER_TICK;
}
return 0;
}
/*-----------------------------------------------------------*/
int clock_gettime( clockid_t clock_id,
struct timespec * tp )
{
TimeOut_t xCurrentTime = { 0 };
/* Intermediate variable used to convert TimeOut_t to struct timespec.
* Also used to detect overflow issues. It must be unsigned because the
* behavior of signed integer overflow is undefined. */
uint64_t ullTickCount = 0ULL;
/* Silence warnings about unused parameters. */
( void ) clock_id;
/* Get the current tick count and overflow count. vTaskSetTimeOutState()
* is used to get these values because they are both static in tasks.c. */
vTaskSetTimeOutState( &xCurrentTime );
/* Adjust the tick count for the number of times a TickType_t has overflowed.
* portMAX_DELAY should be the maximum value of a TickType_t. */
ullTickCount = ( uint64_t ) ( xCurrentTime.xOverflowCount ) << ( sizeof( TickType_t ) * 8 );
/* Add the current tick count. */
ullTickCount += xCurrentTime.xTimeOnEntering;
/* Convert ullTickCount to timespec. */
UTILS_NanosecondsToTimespec( ( int64_t ) ullTickCount * NANOSECONDS_PER_TICK, tp );
return 0;
}
/*-----------------------------------------------------------*/
int clock_nanosleep( clockid_t clock_id,
int flags,
const struct timespec * rqtp,
struct timespec * rmtp )
{
int iStatus = 0;
TickType_t xSleepTime = 0;
struct timespec xCurrentTime = { 0 };
/* Silence warnings about unused parameters. */
( void ) clock_id;
( void ) rmtp;
( void ) flags; /* This is only ignored if INCLUDE_vTaskDelayUntil is 0. */
/* Check rqtp. */
if( UTILS_ValidateTimespec( rqtp ) == false )
{
iStatus = EINVAL;
}
/* Get current time */
if( ( iStatus == 0 ) && ( clock_gettime( CLOCK_REALTIME, &xCurrentTime ) != 0 ) )
{
iStatus = EINVAL;
}
if( iStatus == 0 )
{
/* Check for absolute time sleep. */
if( ( flags & TIMER_ABSTIME ) == TIMER_ABSTIME )
{
/* Get current time */
if( clock_gettime( CLOCK_REALTIME, &xCurrentTime ) != 0 )
{
iStatus = EINVAL;
}
/* Get number of ticks until absolute time. */
if( ( iStatus == 0 ) && ( UTILS_AbsoluteTimespecToDeltaTicks( rqtp, &xCurrentTime, &xSleepTime ) == 0 ) )
{
/* Delay until absolute time if vTaskDelayUntil is available. */
#if ( INCLUDE_vTaskDelayUntil == 1 )
/* Get the current tick count. This variable isn't declared
* at the top of the function because it's only used and needed
* if vTaskDelayUntil is available. */
TickType_t xCurrentTicks = xTaskGetTickCount();
/* Delay until absolute time. */
vTaskDelayUntil( &xCurrentTicks, xSleepTime );
#else
/* If vTaskDelayUntil isn't available, ignore the TIMER_ABSTIME flag
* and sleep for a relative time. */
vTaskDelay( xSleepTime );
#endif
}
}
else
{
/* If TIMER_ABSTIME isn't specified, convert rqtp to ticks and
* sleep for a relative time. */
if( UTILS_TimespecToTicks( rqtp, &xSleepTime ) == 0 )
{
vTaskDelay( xSleepTime );
}
}
}
return iStatus;
}
/*-----------------------------------------------------------*/
int clock_settime( clockid_t clock_id,
const struct timespec * tp )
{
/* Silence warnings about unused parameters. */
( void ) clock_id;
( void ) tp;
/* This function is currently unsupported. It will always return -1 and
* set errno to EPERM. */
errno = EPERM;
return -1;
}
/*-----------------------------------------------------------*/
int nanosleep( const struct timespec * rqtp,
struct timespec * rmtp )
{
int iStatus = 0;
TickType_t xSleepTime = 0;
/* Silence warnings about unused parameters. */
( void ) rmtp;
/* Check rqtp. */
if( UTILS_ValidateTimespec( rqtp ) == false )
{
errno = EINVAL;
iStatus = -1;
}
if( iStatus == 0 )
{
/* Convert rqtp to ticks and delay. */
if( UTILS_TimespecToTicks( rqtp, &xSleepTime ) == 0 )
{
vTaskDelay( xSleepTime );
}
}
return iStatus;
}
/*-----------------------------------------------------------*/
|
