perf evsel: Introduce perf_evsel__{in,ex}it

Out of the {con,des}structor, as in interpreted language bindings we will
need to go back from the wrapper object to the real thing. In that case
using container_of will save us to have an extra pointer in the perf_evsel
struct.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 20 insertions, 9 deletions

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 4b3b84cd71a..df0610e9c61 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -6,17 +6,21 @@
 #include <linux/bitops.h>
 #include <linux/hash.h>
 
+void perf_evlist__init(struct perf_evlist *evlist)
+{
+	int i;
+
+	for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
+		INIT_HLIST_HEAD(&evlist->heads[i]);
+	INIT_LIST_HEAD(&evlist->entries);
+}
+
 struct perf_evlist *perf_evlist__new(void)
 {
 	struct perf_evlist *evlist = zalloc(sizeof(*evlist));
 
-	if (evlist != NULL) {
-		int i;
-
-		for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
-			INIT_HLIST_HEAD(&evlist->heads[i]);
-		INIT_LIST_HEAD(&evlist->entries);
-	}
+	if (evlist != NULL)
+		perf_evlist__init(evlist);
 
 	return evlist;
 }
@@ -33,11 +37,18 @@ static void perf_evlist__purge(struct perf_evlist *evlist)
 	evlist->nr_entries = 0;
 }
 
-void perf_evlist__delete(struct perf_evlist *evlist)
+void perf_evlist__exit(struct perf_evlist *evlist)
 {
-	perf_evlist__purge(evlist);
 	free(evlist->mmap);
 	free(evlist->pollfd);
+	evlist->mmap = NULL;
+	evlist->pollfd = NULL;
+}
+
+void perf_evlist__delete(struct perf_evlist *evlist)
+{
+	perf_evlist__purge(evlist);
+	perf_evlist__exit(evlist);
 	free(evlist);
 }