1 // SPDX-License-Identifier: GPL-2.0
2 #include <perf/threadmap.h>
3 #include <stdlib.h>
4 #include <linux/refcount.h>
5 #include <internal/threadmap.h>
6 #include <string.h>
7 #include <asm/bug.h>
8 #include <stdio.h>
9
10 static void perf_thread_map__reset(struct perf_thread_map *map, int start, int nr)
11 {
12 size_t size = (nr - start) * sizeof(map->map[0]);
13
14 memset(&map->map[start], 0, size);
15 map->err_thread = -1;
16 }
17
18 struct perf_thread_map *perf_thread_map__realloc(struct perf_thread_map *map, int nr)
19 {
20 size_t size = sizeof(*map) + sizeof(map->map[0]) * nr;
21 int start = map ? map->nr : 0;
22
23 map = realloc(map, size);
24 /*
25 * We only realloc to add more items, let's reset new items.
26 */
27 if (map)
28 perf_thread_map__reset(map, start, nr);
29
30 return map;
31 }
32
33 #define thread_map__alloc(__nr) perf_thread_map__realloc(NULL, __nr)
34
35 void perf_thread_map__set_pid(struct perf_thread_map *map, int idx, pid_t pid)
36 {
37 map->map[idx].pid = pid;
38 }
39
40 char *perf_thread_map__comm(struct perf_thread_map *map, int idx)
41 {
42 return map->map[idx].comm;
43 }
44
45 struct perf_thread_map *perf_thread_map__new_array(int nr_threads, pid_t *array)
46 {
47 struct perf_thread_map *threads = thread_map__alloc(nr_threads);
48 int i;
49
50 if (!threads)
51 return NULL;
52
53 for (i = 0; i < nr_threads; i++)
54 perf_thread_map__set_pid(threads, i, array ? array[i] : -1);
55
56 threads->nr = nr_threads;
57 refcount_set(&threads->refcnt, 1);
58
59 return threads;
60 }
61
62 struct perf_thread_map *perf_thread_map__new_dummy(void)
63 {
64 return perf_thread_map__new_array(1, NULL);
65 }
66
67 static void perf_thread_map__delete(struct perf_thread_map *threads)
68 {
69 if (threads) {
70 int i;
71
72 WARN_ONCE(refcount_read(&threads->refcnt) != 0,
73 "thread map refcnt unbalanced\n");
74 for (i = 0; i < threads->nr; i++)
75 free(perf_thread_map__comm(threads, i));
76 free(threads);
77 }
78 }
79
80 struct perf_thread_map *perf_thread_map__get(struct perf_thread_map *map)
81 {
82 if (map)
83 refcount_inc(&map->refcnt);
84 return map;
85 }
86
87 void perf_thread_map__put(struct perf_thread_map *map)
88 {
89 if (map && refcount_dec_and_test(&map->refcnt))
90 perf_thread_map__delete(map);
91 }
92
93 int perf_thread_map__nr(struct perf_thread_map *threads)
94 {
95 return threads ? threads->nr : 1;
96 }
97
98 pid_t perf_thread_map__pid(struct perf_thread_map *map, int idx)
99 {
100 return map->map[idx].pid;
101 }
102
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