summaryrefslogtreecommitdiffstats
path: root/cpukit/rtems/include/rtems/rtems/ratemon.h
blob: 41eb68ed3174ab95e133a12ee1596ea2f67caa3d (plain)
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
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
/**
 * @file rtems/rtems/ratemon.h
 *
 *  This include file contains all the constants, structures, and
 *  prototypes associated with the Rate Monotonic Manager.  This manager
 *  provides facilities to implement tasks which execute in a periodic fashion.
 *
 *  Directives provided are:
 *
 *     - create a rate monotonic timer
 *     - cancel a period
 *     - delete a rate monotonic timer
 *     - conclude current and start the next period
 *     - obtain status information on a period
 */

/*  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.com/license/LICENSE.
 *
 *  $Id$
 */

#ifndef _RTEMS_RTEMS_RATEMON_H
#define _RTEMS_RTEMS_RATEMON_H

/**
 *  This constant is defined to extern most of the time when using 
 *  this header file.  However by defining it to nothing, the data
 *  declared in this header file can be instantiated.  This is done
 *  in a single per manager file.
 */
#ifndef RTEMS_RATEMON_EXTERN
#define RTEMS_RATEMON_EXTERN extern
#endif

#include <rtems/bspIo.h>

/**
 *  @defgroup ClassicRateMon Classic API Rate Monotonic
 *
 *  This encapsulates functionality related to the
 *  Classic API Rate Monotonic Manager.
 */
/**@{*/

#ifdef __cplusplus
extern "C" {
#endif

/*
 *  The user can define this at configure time and go back to ticks
 *  resolution.
 */
#if !defined(__RTEMS_USE_TICKS_RATE_MONOTONIC_STATISTICS__)
  /**
   *  Enable the nanosecond accurate statistics
   *
   *  When not defined, the older style tick accurate granularity
   *  is used.
   */
  #define RTEMS_ENABLE_NANOSECOND_RATE_MONOTONIC_STATISTICS
#endif

/**
 *  This is the type used to manage the rate monotonic timing
 *  statistics.
 */
#if defined(RTEMS_ENABLE_NANOSECOND_RATE_MONOTONIC_STATISTICS)
  typedef struct timespec rtems_rate_monotonic_period_time_t;
#else
  typedef uint32_t rtems_rate_monotonic_period_time_t;
#endif

#include <rtems/score/object.h>
#include <rtems/score/thread.h>
#include <rtems/score/watchdog.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/support.h>

#include <string.h>


/**
 *  The following enumerated type defines the states in which a
 *  period may be.
 */
typedef enum {
  /**
   * This value indicates the period is off the watchdog chain, 
   * and has never been initialized.
   */
  RATE_MONOTONIC_INACTIVE,

  /**
   * This value indicates the period is on the watchdog chain, and 
   * the owner is blocked waiting on it.
   */
  RATE_MONOTONIC_OWNER_IS_BLOCKING,

  /**
   * This value indicates the period is on the watchdog chain, and 
   * running.  The owner should be executed or blocked waiting on
   * another object.
   */
  RATE_MONOTONIC_ACTIVE,

  /**
   * This value indicates the period is on the watchdog chain, and 
   * has expired.  The owner should be blocked waiting for the next period.
   */
  RATE_MONOTONIC_EXPIRED_WHILE_BLOCKING,

  /**
   * This value indicates the period is off the watchdog chain, and 
   * has expired.  The owner is still executing and has taken too much
   * all time to complete this iteration of the period.
   */
  RATE_MONOTONIC_EXPIRED
}   rtems_rate_monotonic_period_states;

/**
 *  The following constant is the interval passed to the rate_monontonic_period
 *  directive to obtain status information.
 */
#define RTEMS_PERIOD_STATUS       WATCHDOG_NO_TIMEOUT

/**
 *  The following defines the statistics kept on each period instance.
 */
typedef struct {
  /** This field contains the number of periods executed. */
  uint32_t     count;
  /** This field contains the number of periods missed. */
  uint32_t     missed_count;

  /** This field contains the least amount of CPU time used in a period. */
  rtems_thread_cpu_usage_t             min_cpu_time;
  /** This field contains the highest amount of CPU time used in a period. */
  rtems_thread_cpu_usage_t             max_cpu_time;
  /** This field contains the total amount of wall time used in a period. */
  rtems_thread_cpu_usage_t             total_cpu_time;

  /** This field contains the least amount of wall time used in a period. */
  rtems_rate_monotonic_period_time_t   min_wall_time;
  /** This field contains the highest amount of wall time used in a period. */
  rtems_rate_monotonic_period_time_t   max_wall_time;
  /** This field contains the total amount of CPU time used in a period. */
  rtems_rate_monotonic_period_time_t   total_wall_time;
}  rtems_rate_monotonic_period_statistics;

/**
 *  The following defines the period status structure.
 */
typedef struct {
  /** This is the Id of the thread using this period. */
  Objects_Id                           owner;

  /** This is the current state of this period. */
  rtems_rate_monotonic_period_states   state;

  /**
   *  This is the length of wall time that has passed since this period
   *  was last initiated.  If the period is expired or has not been initiated,
   *  then this field has no meaning.
   */
  rtems_rate_monotonic_period_time_t   since_last_period;

  /**
   *  This is the amount of CPU time that has been used since this period
   *  was last initiated.  If the period is expired or has not been initiated,
   *  then this field has no meaning.
   */
  rtems_thread_cpu_usage_t             executed_since_last_period;
}  rtems_rate_monotonic_period_status;

/**
 *  The following structure defines the control block used to manage
 *  each period.
 */
typedef struct {
  /** This field is the object management portion of a Period instance. */
  Objects_Control                         Object;

  /** This is the timer used to provide the unblocking mechanism. */
  Watchdog_Control                        Timer;

  /** This field indicates the current state of the period. */
  rtems_rate_monotonic_period_states      state;

  /**
   * This field contains the total CPU usage used while executing
   * the body of the loop that is executed each period.
   */
  rtems_thread_cpu_usage_t                owner_executed_at_period;

  /**
   * This field contains the total wall timer that passed while
   * executing the body of the loop that is executed each period.
   */
  rtems_rate_monotonic_period_time_t      time_at_period;

  /**
   * This field contains the length of the next period to be
   * executed.
   */
  uint32_t                                next_length;

  /**
   * This field contains a pointer to the TCB for the thread
   * which owns and uses this period instance.
   */
  Thread_Control                         *owner;

  /**
   * This field contains the statistics which are maintained
   * on each period.
   */
  rtems_rate_monotonic_period_statistics  Statistics;
}   Rate_monotonic_Control;
 
/**
 *  @brief Rate Monotonic Period Class Management Structure
 *
 *  This instance of Objects_Information is used to manage the
 *  set of rate monotonic period instances.
 */
RTEMS_RATEMON_EXTERN Objects_Information _Rate_monotonic_Information;

/**
 *  @brief Rate Monotonic Manager Initialization
 *
 *  This routine performs the initialization necessary for this manager.
 */
void _Rate_monotonic_Manager_initialization(
  uint32_t   maximum_periods
);

/**
 *  @brief rtems_rate_monotonic_create
 *
 *  This routine implements the rate_monotonic_create directive.  The
 *  period will have the name name.  It returns the id of the
 *  created period in ID.
 */
rtems_status_code rtems_rate_monotonic_create(
  rtems_name    name,
  Objects_Id   *id
);

/**
 *  @brief rtems_rate_monotonic_ident
 *
 *  This routine implements the rtems_rate_monotonic_ident directive.
 *  This directive returns the period ID associated with name.
 *  If more than one period is named name, then the period
 *  to which the ID belongs is arbitrary.
 */
rtems_status_code rtems_rate_monotonic_ident(
  rtems_name    name,
  Objects_Id   *id
);

/**
 *  @brief rtems_rate_monotonic_cancel
 *
 *  This routine implements the rtems_rate_monotonic_cancel directive.  This
 *  directive stops the period associated with ID from continuing to
 *  run.
 */
rtems_status_code rtems_rate_monotonic_cancel(
  Objects_Id id
);

/**
 *  @brief rtems_rate_monotonic_delete
 *
 *  This routine implements the rtems_rate_monotonic_delete directive.  The
 *  period indicated by ID is deleted.
 */
rtems_status_code rtems_rate_monotonic_delete(
  Objects_Id id
);

/**
 *  @brief rtems_rate_monotonic_get_status
 *
 *  This routine implements the rtems_rate_monotonic_get_status directive.
 *  Information about the period indicated by ID is returned.
 *
 */
rtems_status_code rtems_rate_monotonic_get_status(
  Objects_Id                           id,
  rtems_rate_monotonic_period_status  *status
);

/**
 *  @brief rtems_rate_monotonic_get_statistics
 *
 *  This routine implements the rtems_rate_monotonic_get_statistics directive.
 *  Statistics gathered from the use of this period are returned.
 */
rtems_status_code rtems_rate_monotonic_get_statistics(
  Objects_Id                              id,
  rtems_rate_monotonic_period_statistics *statistics
);

/**
 *  @brief rtems_rate_monotonic_reset_statistics
 *
 *  This directive allows a thread to reset the statistics information
 *  on a specific period instance.
 */
rtems_status_code rtems_rate_monotonic_reset_statistics(
  Objects_Id                               id
);

/**
 *  @brief rtems_rate_monotonic_reset_all_statistics
 *
 *  This directive allows a thread to reset the statistics information
 *  on ALL period instances.
 */
void rtems_rate_monotonic_reset_all_statistics( void );

/**
 *  @brief rtems_rate_monotonic_report_statistics
 *
 *  This directive allows a thread to print the statistics information
 *  on ALL period instances which have non-zero counts using printk.
 */
void rtems_rate_monotonic_report_statistics_with_plugin(
  void                  *context,
  rtems_printk_plugin_t  print
);

/**
 *  @brief rtems_rate_monotonic_report_statistics
 *
 *  This directive allows a thread to print the statistics information
 *  on ALL period instances which have non-zero counts using printk.
 */
void rtems_rate_monotonic_report_statistics( void );

/**
 *  @brief rtems_rate_monotonic_period
 *
 *  This routine implements the rtems_rate_monotonic_period directive.  When
 *  length is non-zero, this directive initiates the period associated with
 *  ID from continuing for a period of length.  If length is zero, then
 *  result is set to indicate the current state of the period.
 */
rtems_status_code rtems_rate_monotonic_period(
  Objects_Id      id,
  rtems_interval  length
);

/**
 *  @brief _Rate_monotonic_Timeout
 *
 *  This routine is invoked when the period represented
 *  by ID expires.  If the task which owns this period is blocked
 *  waiting for the period to expire, then it is readied and the
 *  period is restarted.  If the owning task is not waiting for the
 *  period to expire, then the period is placed in the EXPIRED
 *  state and not restarted.
 */
void _Rate_monotonic_Timeout(
  Objects_Id  id,
  void       *ignored
);

/**
 *  @brief _Rate_monotonic_Reset_wall_time_statistics
 *
 *  This method resets the statistics information for a period instance.
 */
#ifdef RTEMS_ENABLE_NANOSECOND_RATE_MONOTONIC_STATISTICS
  #define _Rate_monotonic_Reset_wall_time_statistics( _the_period ) \
     do { \
        /* set the minimums to a large value */ \
        (_the_period)->Statistics.min_wall_time.tv_sec = 0x7fffffff; \
        (_the_period)->Statistics.min_wall_time.tv_nsec = 0x7fffffff; \
     } while (0)
#else
  #define _Rate_monotonic_Reset_wall_time_statistics( _the_period )
#endif

/**
 *  @brief Rate_monotonic_Reset_cpu_use_statistics
 *
 *  This helper method resets the period CPU usage statistics structure.
 */
#ifdef RTEMS_ENABLE_NANOSECOND_CPU_USAGE_STATISTICS
  #define _Rate_monotonic_Reset_cpu_use_statistics( _the_period ) \
     do { \
        /* set the minimums to a large value */ \
        (_the_period)->Statistics.min_cpu_time.tv_sec = 0x7fffffff; \
        (_the_period)->Statistics.min_cpu_time.tv_nsec = 0x7fffffff; \
     } while (0)
#else
  #define _Rate_monotonic_Reset_cpu_use_statistics( _the_period )
#endif

/**
 *  @brief Rate_monotonic_Reset_statistics
 *
 *  This helper method resets the period wall time statistics structure.
 */
#define _Rate_monotonic_Reset_statistics( _the_period ) \
  do { \
    memset( \
      &(_the_period)->Statistics, \
      0, \
      sizeof( rtems_rate_monotonic_period_statistics ) \
    ); \
    _Rate_monotonic_Reset_cpu_use_statistics( _the_period ); \
    _Rate_monotonic_Reset_wall_time_statistics( _the_period ); \
  } while (0)

#ifndef __RTEMS_APPLICATION__
#include <rtems/rtems/ratemon.inl>
#endif

#ifdef __cplusplus
}
#endif

/**@}*/

#endif
/* end of include file */