source: rtems/cpukit/score/include/rtems/score/tod.h @ 0a6fb22

4.104.114.84.95
Last change on this file since 0a6fb22 was 0a6fb22, checked in by Joel Sherrill <joel.sherrill@…>, on Apr 22, 1997 at 8:19:25 PM

Patch from Chris John <cjohns@…> to add use of a select statement
in the unix port idle thread task. This should keep the entire application
from blocking when any component does a blocking application. Also added
TOD_MICROSECONDS_TO_TICKS.

  • Property mode set to 100644
File size: 6.5 KB
Line 
1/*  tod.h
2 *
3 *  This include file contains all the constants and structures associated
4 *  with the Time of Day Handler.
5 *
6 *  COPYRIGHT (c) 1989-1997.
7 *  On-Line Applications Research Corporation (OAR).
8 *  Copyright assigned to U.S. Government, 1994.
9 *
10 *  The license and distribution terms for this file may in
11 *  the file LICENSE in this distribution or at
12 *  http://www.OARcorp.com/rtems/license.html.
13 *
14 *  $Id$
15 */
16
17#ifndef __TIME_OF_DAY_h
18#define __TIME_OF_DAY_h
19
20#ifdef __cplusplus
21extern "C" {
22#endif
23
24#include <rtems/score/object.h>
25#include <rtems/score/watchdog.h>
26
27/*
28 *  The following constants are related to the time of day.
29 */
30
31#define TOD_SECONDS_PER_MINUTE 60
32#define TOD_MINUTES_PER_HOUR   60
33#define TOD_MONTHS_PER_YEAR    12
34#define TOD_DAYS_PER_YEAR      365
35#define TOD_HOURS_PER_DAY      24
36#define TOD_SECONDS_PER_DAY    (TOD_SECONDS_PER_MINUTE * \
37                                TOD_MINUTES_PER_HOUR   * \
38                                TOD_HOURS_PER_DAY)
39
40#define TOD_SECONDS_PER_NON_LEAP_YEAR (365 * TOD_SECONDS_PER_DAY)
41
42#define TOD_MILLISECONDS_PER_SECOND     1000
43#define TOD_MICROSECONDS_PER_SECOND     1000000
44#define TOD_NANOSECONDS_PER_SECOND      1000000000
45#define TOD_NANOSECONDS_PER_MICROSECOND 1000
46
47/*
48 *  The following constant define the earliest year to which an
49 *  time of day can be initialized.  This is considered the
50 *  epoch.
51 */
52
53#define TOD_BASE_YEAR 1988
54
55/*
56 *  The following record defines the time of control block.  This
57 *  control block is used to maintain the current time of day.
58 */
59
60typedef struct {                   /* RTEID style time/date */
61  unsigned32 year;                 /* year, A.D. */
62  unsigned32 month;                /* month, 1 -> 12 */
63  unsigned32 day;                  /* day, 1 -> 31 */
64  unsigned32 hour;                 /* hour, 0 -> 23 */
65  unsigned32 minute;               /* minute, 0 -> 59 */
66  unsigned32 second;               /* second, 0 -> 59 */
67  unsigned32 ticks;                /* elapsed ticks between secs */
68}   TOD_Control;
69
70/*
71 *  The following is TRUE if the application has set the current
72 *  time of day, and FALSE otherwise.
73 */
74
75SCORE_EXTERN boolean _TOD_Is_set;
76
77/*
78 *  The following contains the current time of day.
79 */
80
81SCORE_EXTERN TOD_Control _TOD_Current;
82
83/*
84 *  The following contains the number of seconds from 00:00:00
85 *  January 1, TOD_BASE_YEAR until the current time of day.
86 */
87
88SCORE_EXTERN Watchdog_Interval _TOD_Seconds_since_epoch;
89
90/*
91 *  The following contains the number of microseconds per tick.
92 */
93
94SCORE_EXTERN unsigned32 _TOD_Microseconds_per_tick;
95
96/*
97 *  The following contains the number of clock ticks per second.
98 *
99 *  NOTE:
100 *
101 *  If one second is NOT evenly divisible by the number of microseconds
102 *  per clock tick, this value will contain only the integer portion
103 *  of the division.  This means that the interval between clock ticks
104 *  can be a source of error in the current time of day.
105 */
106
107SCORE_EXTERN unsigned32 _TOD_Ticks_per_second;
108
109/*
110 *  This is the control structure for the watchdog timer which
111 *  fires to service the seconds chain.
112 */
113
114SCORE_EXTERN Watchdog_Control _TOD_Seconds_watchdog;
115
116#ifdef SCORE_INIT
117
118/*
119 *  The following array contains the number of days in all months.
120 *  The first dimension should be 1 for leap years, and 0 otherwise.
121 *  The second dimension should range from 1 to 12 for January to
122 *  February, respectively.
123 */
124
125const unsigned32 _TOD_Days_per_month[ 2 ][ 13 ] = {
126  { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
127  { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
128};
129
130/*
131 *  The following array contains the number of days in all months
132 *  up to the month indicated by the index of the second dimension.
133 *  The first dimension should be 1 for leap years, and 0 otherwise.
134 */
135
136const unsigned16 _TOD_Days_to_date[2][13] = {
137  { 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 },
138  { 0, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335 }
139};
140
141/*
142 *  The following array contains the number of days in the years
143 *  since the last leap year.  The index should be 0 for leap
144 *  years, and the number of years since the beginning of a leap
145 *  year otherwise.
146 */
147
148const unsigned16 _TOD_Days_since_last_leap_year[4] = { 0, 366, 761, 1126 };
149
150#else
151
152extern const unsigned16 _TOD_Days_to_date[2][13]; /* Julian days */
153extern const unsigned16 _TOD_Days_since_last_leap_year[4];
154extern const unsigned32 _TOD_Days_per_month[2][13];
155
156#endif
157
158/*
159 *  _TOD_Handler_initialization
160 *
161 *  DESCRIPTION:
162 *
163 *  This routine performs the initialization necessary for this handler.
164 */
165
166void _TOD_Handler_initialization(
167  unsigned32 microseconds_per_tick
168);
169
170/*
171 *  _TOD_Set
172 *
173 *  DESCRIPTION:
174 *
175 *  This routine sets the current time of day to THE_TOD and
176 *  the equivalent SECONDS_SINCE_EPOCH.
177 */
178
179void _TOD_Set(
180  TOD_Control       *the_tod,
181  Watchdog_Interval  seconds_since_epoch
182);
183
184/*
185 *  _TOD_Validate
186 *
187 *  DESCRIPTION:
188 *
189 *  This function returns TRUE if THE_TOD contains
190 *  a valid time of day, and FALSE otherwise.
191 */
192
193boolean _TOD_Validate(
194  TOD_Control *the_tod
195);
196
197/*
198 *  _TOD_To_seconds
199 *
200 *  DESCRIPTION:
201 *
202 *  This function returns the number seconds between the epoch and THE_TOD.
203 */
204
205Watchdog_Interval _TOD_To_seconds(
206  TOD_Control *the_tod
207);
208
209/*
210 *  _TOD_Tickle
211 *
212 *  DESCRIPTION:
213 *
214 *  This routine is scheduled as a watchdog function and is invoked at
215 *  each second boundary.  It updates the current time of day to indicate
216 *  that a second has passed and processes the seconds watchdog chain.
217 */
218
219void _TOD_Tickle(
220  Objects_Id  id,
221  void       *ignored
222);
223
224/*
225 *  TOD_MILLISECONDS_TO_MICROSECONDS
226 *
227 *  DESCRIPTION:
228 *
229 *  This routine converts an interval expressed in milliseconds to microseconds.
230 *
231 *  NOTE:
232 *
233 *  This must be a macro so it can be used in "static" tables.
234 */
235
236#define TOD_MILLISECONDS_TO_MICROSECONDS(_ms) ((_ms) * 1000)
237
238/*
239 *  TOD_MICROSECONDS_TO_TICKS
240 *
241 *  DESCRIPTION:
242 *
243 *  This routine converts an interval expressed in microseconds to ticks.
244 *
245 *  NOTE:
246 *
247 *  This must be a macro so it can be used in "static" tables.
248 */
249
250#define TOD_MICROSECONDS_TO_TICKS(_us) \
251    ((_us) / _TOD_Microseconds_per_tick)
252
253/*
254 *  TOD_MILLISECONDS_TO_TICKS
255 *
256 *  DESCRIPTION:
257 *
258 *  This routine converts an interval expressed in milliseconds to ticks.
259 *
260 *  NOTE:
261 *
262 *  This must be a macro so it can be used in "static" tables.
263 */
264
265#define TOD_MILLISECONDS_TO_TICKS(_ms) \
266    (TOD_MILLISECONDS_TO_MICROSECONDS(_ms) / _TOD_Microseconds_per_tick)
267
268#ifndef __RTEMS_APPLICATION__
269#include <rtems/score/tod.inl>
270#endif
271
272#ifdef __cplusplus
273}
274#endif
275
276#endif
277/* end of include file */
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