1 // SPDX-License-Identifier: GPL-2.0
2 #include <perf/threadmap.h>
4 #include <linux/refcount.h>
5 #include <internal/threadmap.h>
10 static void perf_thread_map__reset(struct perf_thread_map *map, int start, int nr)
12 size_t size = (nr - start) * sizeof(map->map[0]);
14 memset(&map->map[start], 0, size);
18 struct perf_thread_map *perf_thread_map__realloc(struct perf_thread_map *map, int nr)
20 size_t size = sizeof(*map) + sizeof(map->map[0]) * nr;
21 int start = map ? map->nr : 0;
23 map = realloc(map, size);
25 * We only realloc to add more items, let's reset new items.
28 perf_thread_map__reset(map, start, nr);
33 #define thread_map__alloc(__nr) perf_thread_map__realloc(NULL, __nr)
35 void perf_thread_map__set_pid(struct perf_thread_map *map, int thread, pid_t pid)
37 map->map[thread].pid = pid;
40 char *perf_thread_map__comm(struct perf_thread_map *map, int thread)
42 return map->map[thread].comm;
45 struct perf_thread_map *perf_thread_map__new_dummy(void)
47 struct perf_thread_map *threads = thread_map__alloc(1);
49 if (threads != NULL) {
50 perf_thread_map__set_pid(threads, 0, -1);
52 refcount_set(&threads->refcnt, 1);
57 static void perf_thread_map__delete(struct perf_thread_map *threads)
62 WARN_ONCE(refcount_read(&threads->refcnt) != 0,
63 "thread map refcnt unbalanced\n");
64 for (i = 0; i < threads->nr; i++)
65 free(perf_thread_map__comm(threads, i));
70 struct perf_thread_map *perf_thread_map__get(struct perf_thread_map *map)
73 refcount_inc(&map->refcnt);
77 void perf_thread_map__put(struct perf_thread_map *map)
79 if (map && refcount_dec_and_test(&map->refcnt))
80 perf_thread_map__delete(map);
83 int perf_thread_map__nr(struct perf_thread_map *threads)
85 return threads ? threads->nr : 1;
88 pid_t perf_thread_map__pid(struct perf_thread_map *map, int thread)
90 return map->map[thread].pid;