Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib/aqueue.c @ 9451:9fff30644260 HEAD

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istream-concat: Fixed a lot of bugs.
author Timo Sirainen <tss@iki.fi>
date Mon, 26 Oct 2009 17:06:57 -0400
parents b9faf4db2a9f
children 00cd9aacd03c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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b9faf4db2a9f Updated copyright notices to include year 2009.
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1 /* Copyright (c) 2003-2009 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "array.h"
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5 #include "aqueue.h"
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6
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7 struct aqueue *aqueue_init(struct array *array)
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8 {
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9 struct aqueue *aqueue;
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10
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11 aqueue = i_new(struct aqueue, 1);
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12 aqueue->arr = array;
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13 aqueue->area_size = buffer_get_size(aqueue->arr->buffer) /
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14 aqueue->arr->element_size;
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15 i_assert(aqueue->area_size > 0);
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16 return aqueue;
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17 }
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18
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19 void aqueue_deinit(struct aqueue **_aqueue)
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20 {
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21 struct aqueue *aqueue = *_aqueue;
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22
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23 *_aqueue = NULL;
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24 i_free(aqueue);
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25 }
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26
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27 static void aqueue_grow(struct aqueue *aqueue)
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28 {
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29 unsigned int orig_area_size, count;
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30
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31 i_assert(aqueue->full && aqueue->head == aqueue->tail);
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32
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33 orig_area_size = aqueue->area_size;
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34 (void)array_append_space_i(aqueue->arr);
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35 aqueue->area_size = buffer_get_size(aqueue->arr->buffer) /
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36 aqueue->arr->element_size;
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37 i_assert(orig_area_size < aqueue->area_size);
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38
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39 count = I_MIN(aqueue->area_size - orig_area_size, aqueue->head);
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40 array_copy(aqueue->arr, orig_area_size, aqueue->arr, 0, count);
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41 if (count < aqueue->area_size - orig_area_size)
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42 aqueue->head = orig_area_size + count;
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43 else {
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44 array_copy(aqueue->arr, 0, aqueue->arr, count,
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45 aqueue->head - count);
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46 aqueue->head -= count;
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47 }
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48
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49 i_assert(aqueue->head != aqueue->tail);
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50 aqueue->full = FALSE;
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51 }
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52
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53 void aqueue_append(struct aqueue *aqueue, const void *data)
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54 {
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55 if (aqueue->full) {
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56 aqueue_grow(aqueue);
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57 i_assert(!aqueue->full);
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58 }
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59
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60 array_idx_set_i(aqueue->arr, aqueue->head, data);
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61 aqueue->head = (aqueue->head + 1) % aqueue->area_size;
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62 aqueue->full = aqueue->head == aqueue->tail;
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63 }
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64
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65 void aqueue_delete(struct aqueue *aqueue, unsigned int n)
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66 {
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67 unsigned int idx, count = aqueue_count(aqueue);
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68
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69 i_assert(n < count);
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70
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71 aqueue->full = FALSE;
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72 if (n == 0) {
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73 /* optimized deletion from tail */
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74 aqueue->tail = (aqueue->tail + 1) % aqueue->area_size;
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75 return;
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76 }
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77 if (n == count-1) {
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78 /* optimized deletion from head */
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79 aqueue->head = (aqueue->head + aqueue->area_size - 1) %
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80 aqueue->area_size;
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81 return;
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82 }
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83
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84 idx = aqueue_idx(aqueue, n);
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85 if ((n < count/2 || idx > aqueue->head) && idx > aqueue->tail) {
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86 /* move tail forward.
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87 ..tail##idx##head.. or ##head..tail##idx## */
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88 array_copy(aqueue->arr, aqueue->tail + 1,
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89 aqueue->arr, aqueue->tail,
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90 idx - aqueue->tail);
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91 aqueue->tail++;
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92 i_assert(aqueue->tail < aqueue->area_size);
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93 } else {
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94 /* move head backward.
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95 ..tail##idx##head.. or ##idx##head..tail## */
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96 i_assert(idx < aqueue->head);
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97 array_copy(aqueue->arr, idx,
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98 aqueue->arr, idx + 1,
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99 aqueue->head - idx);
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100 aqueue->head = (aqueue->head + aqueue->area_size - 1) %
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101 aqueue->area_size;
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102 }
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103 i_assert(aqueue->head < aqueue->area_size &&
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104 aqueue->head != aqueue->tail);
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105 }
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106
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107 void aqueue_delete_tail(struct aqueue *aqueue)
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108 {
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109 aqueue_delete(aqueue, 0);
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110 }
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111
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112 void aqueue_clear(struct aqueue *aqueue)
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113 {
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114 aqueue->head = aqueue->tail = 0;
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115 aqueue->full = FALSE;
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116 }
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117
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118 unsigned int aqueue_count(const struct aqueue *aqueue)
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119 {
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120 unsigned int area_size = aqueue->area_size;
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121
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122 return aqueue->full ? area_size :
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123 (area_size - aqueue->tail + aqueue->head) % area_size;
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124 }