summaryrefslogtreecommitdiffstats
path: root/c/src/exec/score/inline/chain.inl
blob: 4bd80116aece900f614a79d5a5fd6cc6d765b55d (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
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
/*  inline/chain.inl
 *
 *  This include file contains the bodies of the routines which are
 *  associated with doubly linked chains and inlined.
 *
 *  NOTE:  The routines in this file are ordered from simple
 *         to complex.  No other Chain Handler routine is referenced
 *         unless it has already been defined.
 *
 *  COPYRIGHT (c) 1989-1998.
 *  On-Line Applications Research Corporation (OAR).
 *  Copyright assigned to U.S. Government, 1994.
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  $Id$
 */

#ifndef __INLINE_CHAIN_inl
#define __INLINE_CHAIN_inl

/*PAGE
 *
 *  _Chain_Are_nodes_equal
 *
 *  DESCRIPTION:
 *
 *  This function returns TRUE if LEFT and RIGHT are equal,
 *  and FALSE otherwise.
 */

RTEMS_INLINE_ROUTINE boolean _Chain_Are_nodes_equal(
  Chain_Node *left,
  Chain_Node *right
)
{
  return left == right;
}

/*PAGE
 *
 *  _Chain_Is_null
 *
 *  DESCRIPTION:
 *
 *  This function returns TRUE if the_chain is NULL and FALSE otherwise.
 */

RTEMS_INLINE_ROUTINE boolean _Chain_Is_null(
  Chain_Control *the_chain
)
{
  return ( the_chain == NULL );
}

/*PAGE
 *
 *  _Chain_Is_null_node
 *
 *  DESCRIPTION:
 *
 *  This function returns TRUE if the_node is NULL and FALSE otherwise.
 */

RTEMS_INLINE_ROUTINE boolean _Chain_Is_null_node(
  Chain_Node *the_node
)
{
  return ( the_node == NULL );
}

/*PAGE
 *
 *  _Chain_Head
 *
 *  DESCRIPTION:
 *
 *  This function returns a pointer to the first node on the chain.
 */

RTEMS_INLINE_ROUTINE Chain_Node *_Chain_Head(
  Chain_Control *the_chain
)
{
   return (Chain_Node *) the_chain;
}

/*PAGE
 *
 *  _Chain_Tail
 *
 *  DESCRIPTION:
 *
 *  This function returns a pointer to the last node on the chain.
 */

RTEMS_INLINE_ROUTINE Chain_Node *_Chain_Tail(
  Chain_Control *the_chain
)
{
   return (Chain_Node *) &the_chain->permanent_null;
}

/*PAGE
 *
 *  _Chain_Is_empty
 *
 *  DESCRIPTION:
 *
 *  This function returns TRUE if there a no nodes on the_chain and
 *  FALSE otherwise.
 */

RTEMS_INLINE_ROUTINE boolean _Chain_Is_empty(
  Chain_Control *the_chain
)
{
  return ( the_chain->first == _Chain_Tail( the_chain ) );
}

/*PAGE
 *
 *  _Chain_Is_first
 *
 *  DESCRIPTION:
 *
 *  This function returns TRUE if the_node is the first node on a chain and
 *  FALSE otherwise.
 */

RTEMS_INLINE_ROUTINE boolean _Chain_Is_first(
  Chain_Node *the_node
)
{
  return ( the_node->previous == NULL );
}

/*PAGE
 *
 *  _Chain_Is_last
 *
 *  DESCRIPTION:
 *
 *  This function returns TRUE if the_node is the last node on a chain and
 *  FALSE otherwise.
 */

RTEMS_INLINE_ROUTINE boolean _Chain_Is_last(
  Chain_Node *the_node
)
{
  return ( the_node->next == NULL );
}

/*PAGE
 *
 *  _Chain_Has_only_one_node
 *
 *  DESCRIPTION:
 *
 *  This function returns TRUE if there is only one node on the_chain and
 *  FALSE otherwise.
 */

RTEMS_INLINE_ROUTINE boolean _Chain_Has_only_one_node(
  Chain_Control *the_chain
)
{
  return ( the_chain->first == the_chain->last );
}

/*PAGE
 *
 *  _Chain_Is_head
 *
 *  DESCRIPTION:
 *
 *  This function returns TRUE if the_node is the head of the_chain and
 *  FALSE otherwise.
 */

RTEMS_INLINE_ROUTINE boolean _Chain_Is_head(
  Chain_Control *the_chain,
  Chain_Node    *the_node
)
{
   return ( the_node == _Chain_Head( the_chain ) );
}

/*PAGE
 *
 *  _Chain_Is_tail
 *
 *  DESCRIPTION:
 *
 *  This function returns TRUE if the_node is the tail of the_chain and
 *  FALSE otherwise.
 */

RTEMS_INLINE_ROUTINE boolean _Chain_Is_tail(
  Chain_Control *the_chain,
  Chain_Node    *the_node
)
{
   return ( the_node == _Chain_Tail( the_chain ) );
}

/*PAGE
 *
 *  Chain_Initialize_empty
 *
 *  DESCRIPTION:
 *
 *  This routine initializes the specified chain to contain zero nodes.
 */

RTEMS_INLINE_ROUTINE void _Chain_Initialize_empty(
  Chain_Control *the_chain
)
{
  the_chain->first          = _Chain_Tail( the_chain );
  the_chain->permanent_null = NULL;
  the_chain->last           = _Chain_Head( the_chain );
}

/*PAGE
 *
 *  _Chain_Extract_unprotected
 *
 *  DESCRIPTION:
 *
 *  This routine extracts the_node from the chain on which it resides.
 *  It does NOT disable interrupts to insure the atomicity of the
 *  extract operation.
 */

RTEMS_INLINE_ROUTINE void _Chain_Extract_unprotected(
  Chain_Node *the_node
)
{
  Chain_Node *next;
  Chain_Node *previous;

  next           = the_node->next;
  previous       = the_node->previous;
  next->previous = previous;
  previous->next = next;
}

/*PAGE
 *
 *  _Chain_Get_first_unprotected
 *
 *  DESCRIPTION:
 *
 *  This function removes the first node from the_chain and returns
 *  a pointer to that node.  It does NOT disable interrupts to insure
 *  the atomicity of the get operation.
 */

RTEMS_INLINE_ROUTINE Chain_Node *_Chain_Get_first_unprotected(
  Chain_Control *the_chain
)
{
  Chain_Node  *return_node;
  Chain_Node  *new_first;

  return_node         = the_chain->first;
  new_first           = return_node->next;
  the_chain->first    = new_first;
  new_first->previous = _Chain_Head( the_chain );

  return return_node;
}

/*PAGE
 *
 *  Chain_Get_unprotected
 *
 *  DESCRIPTION:
 *
 *  This function removes the first node from the_chain and returns
 *  a pointer to that node.  If the_chain is empty, then NULL is returned.
 *  It does NOT disable interrupts to insure the atomicity of the
 *  get operation.
 */

RTEMS_INLINE_ROUTINE Chain_Node *_Chain_Get_unprotected(
  Chain_Control *the_chain
)
{
  if ( !_Chain_Is_empty( the_chain ) )
    return _Chain_Get_first_unprotected( the_chain );
  else
    return NULL;
}

/*PAGE
 *
 *  _Chain_Insert_unprotected
 *
 *  DESCRIPTION:
 *
 *  This routine inserts the_node on a chain immediately following
 *  after_node.  It does NOT disable interrupts to insure the atomicity
 *  of the extract operation.
 */

RTEMS_INLINE_ROUTINE void _Chain_Insert_unprotected(
  Chain_Node *after_node,
  Chain_Node *the_node
)
{
  Chain_Node *before_node;

  the_node->previous    = after_node;
  before_node           = after_node->next;
  after_node->next      = the_node;
  the_node->next        = before_node;
  before_node->previous = the_node;
}

/*PAGE
 *
 *  _Chain_Append_unprotected
 *
 *  DESCRIPTION:
 *
 *  This routine appends the_node onto the end of the_chain.
 *  It does NOT disable interrupts to insure the atomicity of the
 *  append operation.
 */

RTEMS_INLINE_ROUTINE void _Chain_Append_unprotected(
  Chain_Control *the_chain,
  Chain_Node    *the_node
)
{
  Chain_Node *old_last_node;

  the_node->next      = _Chain_Tail( the_chain );
  old_last_node       = the_chain->last;
  the_chain->last     = the_node;
  old_last_node->next = the_node;
  the_node->previous  = old_last_node;
}

/*PAGE
 *
 *  _Chain_Prepend_unprotected
 *
 *  DESCRIPTION:
 *
 *  This routine prepends the_node onto the front of the_chain.
 *  It does NOT disable interrupts to insure the atomicity of the
 *  prepend operation.
 */

RTEMS_INLINE_ROUTINE void _Chain_Prepend_unprotected(
  Chain_Control *the_chain,
  Chain_Node    *the_node
)
{
  _Chain_Insert_unprotected( _Chain_Head( the_chain ), the_node );

}

/*PAGE
 *
 *  _Chain_Prepend
 *
 *  DESCRIPTION:
 *
 *  This routine prepends the_node onto the front of the_chain.
 *  It disables interrupts to insure the atomicity of the
 *  prepend operation.
 */

RTEMS_INLINE_ROUTINE void _Chain_Prepend(
  Chain_Control *the_chain,
  Chain_Node    *the_node
)
{
  _Chain_Insert( _Chain_Head( the_chain ), the_node );
}

#endif
/* end of include file */