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
10static 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
18struct 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
35void perf_thread_map__set_pid(struct perf_thread_map *map, int idx, pid_t pid)
36{
37 map->map[idx].pid = pid;
38}
39
40char *perf_thread_map__comm(struct perf_thread_map *map, int idx)
41{
42 return map->map[idx].comm;
43}
44
45struct 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(map: threads, idx: i, pid: array ? array[i] : -1);
55
56 threads->nr = nr_threads;
57 refcount_set(r: &threads->refcnt, n: 1);
58
59 return threads;
60}
61
62struct perf_thread_map *perf_thread_map__new_dummy(void)
63{
64 return perf_thread_map__new_array(nr_threads: 1, NULL);
65}
66
67static 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(map: threads, idx: i));
76 free(threads);
77 }
78}
79
80struct perf_thread_map *perf_thread_map__get(struct perf_thread_map *map)
81{
82 if (map)
83 refcount_inc(r: &map->refcnt);
84 return map;
85}
86
87void perf_thread_map__put(struct perf_thread_map *map)
88{
89 if (map && refcount_dec_and_test(r: &map->refcnt))
90 perf_thread_map__delete(threads: map);
91}
92
93int perf_thread_map__nr(struct perf_thread_map *threads)
94{
95 return threads ? threads->nr : 1;
96}
97
98pid_t perf_thread_map__pid(struct perf_thread_map *map, int idx)
99{
100 if (!map) {
101 assert(idx == 0);
102 return -1;
103 }
104
105 return map->map[idx].pid;
106}
107
108int perf_thread_map__idx(struct perf_thread_map *threads, pid_t pid)
109{
110 if (!threads)
111 return pid == -1 ? 0 : -1;
112
113 for (int i = 0; i < threads->nr; ++i) {
114 if (threads->map[i].pid == pid)
115 return i;
116 }
117 return -1;
118}
119

source code of linux/tools/lib/perf/threadmap.c