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    Subject[tip:perf/core] perf tools: Introduce pstack_peek()
    Commit-ID:  c8539e3fc630067020814657636b45095edfb5bb
    Gitweb: http://git.kernel.org/tip/c8539e3fc630067020814657636b45095edfb5bb
    Author: Namhyung Kim <namhyung@kernel.org>
    AuthorDate: Fri, 24 Apr 2015 10:15:32 +0900
    Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
    CommitDate: Tue, 5 May 2015 18:13:22 -0300

    perf tools: Introduce pstack_peek()

    The pstack_peek() is to get the topmost entry without removing it.

    Signed-off-by: Namhyung Kim <namhyung@kernel.org>
    Acked-by: Jiri Olsa <jolsa@redhat.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Link: http://lkml.kernel.org/r/1429838133-14001-1-git-send-email-namhyung@kernel.org
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/perf/util/pstack.c | 7 +++++++
    tools/perf/util/pstack.h | 1 +
    2 files changed, 8 insertions(+)

    diff --git a/tools/perf/util/pstack.c b/tools/perf/util/pstack.c
    index a126e6c..b234a6e 100644
    --- a/tools/perf/util/pstack.c
    +++ b/tools/perf/util/pstack.c
    @@ -74,3 +74,10 @@ void *pstack__pop(struct pstack *pstack)
    pstack->entries[pstack->top] = NULL;
    return ret;
    }
    +
    +void *pstack__peek(struct pstack *pstack)
    +{
    + if (pstack->top == 0)
    + return NULL;
    + return pstack->entries[pstack->top - 1];
    +}
    diff --git a/tools/perf/util/pstack.h b/tools/perf/util/pstack.h
    index c3cb658..ded7f2e 100644
    --- a/tools/perf/util/pstack.h
    +++ b/tools/perf/util/pstack.h
    @@ -10,5 +10,6 @@ bool pstack__empty(const struct pstack *pstack);
    void pstack__remove(struct pstack *pstack, void *key);
    void pstack__push(struct pstack *pstack, void *key);
    void *pstack__pop(struct pstack *pstack);
    +void *pstack__peek(struct pstack *pstack);

    #endif /* _PERF_PSTACK_ */

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