tools/lib/perf/threadmap.c

   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 thread, pid_t pid)
  36 {
  37         map->map[thread].pid = pid;
  38 }
  39
  40 char *perf_thread_map__comm(struct perf_thread_map *map, int thread)
  41 {
  42         return map->map[thread].comm;
  43 }
  44
  45 struct perf_thread_map *perf_thread_map__new_dummy(void)
  46 {
  47         struct perf_thread_map *threads = thread_map__alloc(1);
  48
  49         if (threads != NULL) {
  50                 perf_thread_map__set_pid(threads, 0, -1);
  51                 threads->nr = 1;
  52                 refcount_set(&threads->refcnt, 1);
  53         }
  54         return threads;
  55 }
  56
  57 static void perf_thread_map__delete(struct perf_thread_map *threads)
  58 {
  59         if (threads) {
  60                 int i;
  61
  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));
  66                 free(threads);
  67         }
  68 }
  69
  70 struct perf_thread_map *perf_thread_map__get(struct perf_thread_map *map)
  71 {
  72         if (map)
  73                 refcount_inc(&map->refcnt);
  74         return map;
  75 }
  76
  77 void perf_thread_map__put(struct perf_thread_map *map)
  78 {
  79         if (map && refcount_dec_and_test(&map->refcnt))
  80                 perf_thread_map__delete(map);
  81 }
  82
  83 int perf_thread_map__nr(struct perf_thread_map *threads)
  84 {
  85         return threads ? threads->nr : 1;
  86 }
  87
  88 pid_t perf_thread_map__pid(struct perf_thread_map *map, int thread)
  89 {
  90         return map->map[thread].pid;
  91 }