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8921c6e4 MD |
1 | /* |
2 | * Copyright (C) 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License, version 2 only, as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 51 | |
15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #define _GNU_SOURCE | |
19 | #define _LGPL_SOURCE | |
20 | #include <assert.h> | |
21 | #include <common/common.h> | |
22 | #include <common/utils.h> | |
23 | #include <common/defaults.h> | |
24 | ||
25 | #include "tracefile-array.h" | |
26 | ||
27 | struct tracefile_array *tracefile_array_create(size_t count) | |
28 | { | |
29 | struct tracefile_array *tfa = NULL; | |
30 | int i; | |
31 | ||
32 | tfa = zmalloc(sizeof(*tfa)); | |
33 | if (!tfa) { | |
34 | goto error; | |
35 | } | |
36 | tfa->tf = zmalloc(sizeof(*tfa->tf) * count); | |
37 | if (!tfa->tf) { | |
38 | goto error; | |
39 | } | |
40 | tfa->count = count; | |
41 | for (i = 0; i < count; i++) { | |
42 | tfa->tf[i].seq_head = -1ULL; | |
43 | tfa->tf[i].seq_tail = -1ULL; | |
44 | } | |
45 | tfa->seq_head = -1ULL; | |
46 | tfa->seq_tail = -1ULL; | |
47 | return tfa; | |
48 | ||
49 | error: | |
50 | if (tfa) { | |
51 | free(tfa->tf); | |
52 | } | |
53 | free(tfa); | |
54 | return NULL; | |
55 | } | |
56 | ||
57 | void tracefile_array_destroy(struct tracefile_array *tfa) | |
58 | { | |
59 | if (!tfa) { | |
60 | return; | |
61 | } | |
62 | free(tfa->tf); | |
63 | free(tfa); | |
64 | } | |
65 | ||
66 | void tracefile_array_file_rotate(struct tracefile_array *tfa) | |
67 | { | |
68 | uint64_t *headp, *tailp; | |
69 | ||
70 | if (!tfa->count) { | |
71 | /* Not in tracefile rotation mode. */ | |
72 | return; | |
73 | } | |
74 | /* Rotate to next file. */ | |
75 | tfa->file_head = (tfa->file_head + 1) % tfa->count; | |
76 | if (tfa->file_head == tfa->file_tail) { | |
77 | /* Move tail. */ | |
78 | tfa->file_tail = (tfa->file_tail + 1) % tfa->count; | |
79 | } | |
80 | headp = &tfa->tf[tfa->file_head].seq_head; | |
81 | tailp = &tfa->tf[tfa->file_head].seq_tail; | |
82 | /* | |
83 | * If we overwrite a file with content, we need to push the tail | |
84 | * to the position following the content we are overwriting. | |
85 | */ | |
86 | if (*headp != -1ULL) { | |
87 | tfa->seq_tail = tfa->tf[tfa->file_tail].seq_tail; | |
88 | } | |
89 | /* Reset this file head/tail (overwrite). */ | |
90 | *headp = -1ULL; | |
91 | *tailp = -1ULL; | |
92 | } | |
93 | ||
94 | void tracefile_array_commit_seq(struct tracefile_array *tfa) | |
95 | { | |
96 | uint64_t *headp, *tailp; | |
97 | ||
98 | /* Increment overall head. */ | |
99 | tfa->seq_head++; | |
100 | /* If we are committing our first index overall, set tail to 0. */ | |
101 | if (tfa->seq_tail == -1ULL) { | |
102 | tfa->seq_tail = 0; | |
103 | } | |
104 | if (!tfa->count) { | |
105 | /* Not in tracefile rotation mode. */ | |
106 | return; | |
107 | } | |
108 | headp = &tfa->tf[tfa->file_head].seq_head; | |
109 | tailp = &tfa->tf[tfa->file_head].seq_tail; | |
110 | /* Update head tracefile seq_head. */ | |
111 | *headp = tfa->seq_head; | |
112 | /* | |
113 | * If we are committing our first index in this packet, set tail | |
114 | * to this index seq count. | |
115 | */ | |
116 | if (*tailp == -1ULL) { | |
117 | *tailp = tfa->seq_head; | |
118 | } | |
119 | } | |
120 | ||
121 | uint64_t tracefile_array_get_file_index_head(struct tracefile_array *tfa) | |
122 | { | |
123 | return tfa->file_head; | |
124 | } | |
125 | ||
126 | uint64_t tracefile_array_get_seq_head(struct tracefile_array *tfa) | |
127 | { | |
128 | return tfa->seq_head; | |
129 | } | |
130 | ||
131 | uint64_t tracefile_array_get_file_index_tail(struct tracefile_array *tfa) | |
132 | { | |
133 | return tfa->file_tail; | |
134 | } | |
135 | ||
136 | uint64_t tracefile_array_get_seq_tail(struct tracefile_array *tfa) | |
137 | { | |
138 | return tfa->seq_tail; | |
139 | } | |
140 | ||
141 | bool tracefile_array_seq_in_file(struct tracefile_array *tfa, | |
142 | uint64_t file_index, uint64_t seq) | |
143 | { | |
144 | if (!tfa->count) { | |
145 | /* | |
146 | * Not in tracefile rotation mode; we are guaranteed to have the | |
147 | * index in this file. | |
148 | */ | |
149 | return true; | |
150 | } | |
151 | assert(file_index < tfa->count); | |
152 | if (seq == -1ULL) { | |
153 | return false; | |
154 | } | |
155 | if (seq >= tfa->tf[file_index].seq_tail | |
156 | && seq <= tfa->tf[file_index].seq_head) { | |
157 | return true; | |
158 | } else { | |
159 | return false; | |
160 | } | |
161 | } |