libperf: Rename arguments of perf_thread_map APIs

The "int thread" input arguments of some perf_thead_map APIs are index
of the thread in the thread map.

In order to avoid confusion and to make the APIs consistent with
perf_cpu_map APIs, those arguments are renamed to "int idx".
Suggested-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20220221102612.43879-1-tz.stoyanov@gmail.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/lib/perf/Documentation/libperf.txt

@@ -63,10 +63,10 @@ SYNOPSIS
 
   struct perf_thread_map *perf_thread_map__new_dummy(void);
 
-  void perf_thread_map__set_pid(struct perf_thread_map *map, int thread, pid_t pid);
-  char *perf_thread_map__comm(struct perf_thread_map *map, int thread);
+  void perf_thread_map__set_pid(struct perf_thread_map *map, int idx, pid_t pid);
+  char *perf_thread_map__comm(struct perf_thread_map *map, int idx);
   int perf_thread_map__nr(struct perf_thread_map *threads);
-  pid_t perf_thread_map__pid(struct perf_thread_map *map, int thread);
+  pid_t perf_thread_map__pid(struct perf_thread_map *map, int idx);
 
   struct perf_thread_map *perf_thread_map__get(struct perf_thread_map *map);
   void perf_thread_map__put(struct perf_thread_map *map);

tools/lib/perf/include/perf/threadmap.h

@@ -9,10 +9,10 @@ struct perf_thread_map;
 
 LIBPERF_API struct perf_thread_map *perf_thread_map__new_dummy(void);
 
-LIBPERF_API void perf_thread_map__set_pid(struct perf_thread_map *map, int thread, pid_t pid);
-LIBPERF_API char *perf_thread_map__comm(struct perf_thread_map *map, int thread);
+LIBPERF_API void perf_thread_map__set_pid(struct perf_thread_map *map, int idx, pid_t pid);
+LIBPERF_API char *perf_thread_map__comm(struct perf_thread_map *map, int idx);
 LIBPERF_API int perf_thread_map__nr(struct perf_thread_map *threads);
-LIBPERF_API pid_t perf_thread_map__pid(struct perf_thread_map *map, int thread);
+LIBPERF_API pid_t perf_thread_map__pid(struct perf_thread_map *map, int idx);
 
 LIBPERF_API struct perf_thread_map *perf_thread_map__get(struct perf_thread_map *map);
 LIBPERF_API void perf_thread_map__put(struct perf_thread_map *map);

tools/lib/perf/threadmap.c

@@ -32,14 +32,14 @@ struct perf_thread_map *perf_thread_map__realloc(struct perf_thread_map *map, in
 
 #define thread_map__alloc(__nr) perf_thread_map__realloc(NULL, __nr)
 
-void perf_thread_map__set_pid(struct perf_thread_map *map, int thread, pid_t pid)
+void perf_thread_map__set_pid(struct perf_thread_map *map, int idx, pid_t pid)
 {
-	map->map[thread].pid = pid;
+	map->map[idx].pid = pid;
 }
 
-char *perf_thread_map__comm(struct perf_thread_map *map, int thread)
+char *perf_thread_map__comm(struct perf_thread_map *map, int idx)
 {
-	return map->map[thread].comm;
+	return map->map[idx].comm;
 }
 
 struct perf_thread_map *perf_thread_map__new_dummy(void)
@@ -85,7 +85,7 @@ int perf_thread_map__nr(struct perf_thread_map *threads)
 	return threads ? threads->nr : 1;
 }
 
-pid_t perf_thread_map__pid(struct perf_thread_map *map, int thread)
+pid_t perf_thread_map__pid(struct perf_thread_map *map, int idx)
 {
-	return map->map[thread].pid;
+	return map->map[idx].pid;
 }