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Subject[PATCH 47/79] libperf: Add perf_evlist__for_each_evsel macro
Date
Adding perf_evlist__for_each_evsel macro to iterate
perf_evsel objects in evlist.

Adding perf_evlist__next function to do that.

Link: http://lkml.kernel.org/n/tip-usi0zxyxmai1ld94nrbum43i@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/lib/evlist.c | 20 ++++++++++++++++++++
tools/perf/lib/include/perf/evlist.h | 7 +++++++
tools/perf/lib/libperf.map | 1 +
3 files changed, 28 insertions(+)

diff --git a/tools/perf/lib/evlist.c b/tools/perf/lib/evlist.c
index 0517deb4cb1c..8c26ebf290f0 100644
--- a/tools/perf/lib/evlist.c
+++ b/tools/perf/lib/evlist.c
@@ -34,3 +34,23 @@ struct perf_evlist *perf_evlist__new(void)

return evlist;
}
+
+struct perf_evsel*
+perf_evlist__next(struct perf_evlist *evlist, struct perf_evsel *prev)
+{
+ struct perf_evsel *next;
+
+ if (!prev) {
+ next = list_first_entry(&evlist->entries,
+ struct perf_evsel,
+ node);
+ } else {
+ next = list_next_entry(prev, node);
+ }
+
+ /* Empty list is noticed here so don't need checking on entry. */
+ if (&next->node == &evlist->entries)
+ return NULL;
+
+ return next;
+}
diff --git a/tools/perf/lib/include/perf/evlist.h b/tools/perf/lib/include/perf/evlist.h
index 7255a60869a1..5092b622935b 100644
--- a/tools/perf/lib/include/perf/evlist.h
+++ b/tools/perf/lib/include/perf/evlist.h
@@ -13,5 +13,12 @@ LIBPERF_API void perf_evlist__add(struct perf_evlist *evlist,
LIBPERF_API void perf_evlist__remove(struct perf_evlist *evlist,
struct perf_evsel *evsel);
LIBPERF_API struct perf_evlist *perf_evlist__new(void);
+LIBPERF_API struct perf_evsel* perf_evlist__next(struct perf_evlist *evlist,
+ struct perf_evsel *evsel);
+
+#define perf_evlist__for_each_evsel(evlist, pos) \
+ for ((pos) = perf_evlist__next((evlist), NULL); \
+ (pos) != NULL; \
+ (pos) = perf_evlist__next((evlist), (pos)))

#endif /* __LIBPERF_EVLIST_H */
diff --git a/tools/perf/lib/libperf.map b/tools/perf/lib/libperf.map
index e3eac9b60726..c0968226f7b6 100644
--- a/tools/perf/lib/libperf.map
+++ b/tools/perf/lib/libperf.map
@@ -17,6 +17,7 @@ LIBPERF_0.0.1 {
perf_evlist__init;
perf_evlist__add;
perf_evlist__remove;
+ perf_evlist__next;
local:
*;
};
--
2.21.0
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