Messages in this thread Patch in this message | | | From | Namhyung Kim <> | Subject | [PATCH 1/5] tools lib traceevent: Add WARN and WARN_ONCE macros | Date | Tue, 7 Jan 2014 12:00:08 +0900 |
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They're copied from the perf code and will be used to print error message during trace_seq_printf() and friends.
Suggested-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org> --- tools/lib/traceevent/event-utils.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/tools/lib/traceevent/event-utils.h b/tools/lib/traceevent/event-utils.h index e76c9acb92cd..5dc0aec5ab50 100644 --- a/tools/lib/traceevent/event-utils.h +++ b/tools/lib/traceevent/event-utils.h @@ -38,6 +38,28 @@ void __vdie(const char *fmt, ...); void __vwarning(const char *fmt, ...); void __vpr_stat(const char *fmt, ...); +#define likely(x) __builtin_expect(!!(x), 1) +#define unlikely(x) __builtin_expect(!!(x), 0) + +#define __WARN_printf(arg...) do { fprintf(stderr, arg); } while (0) + +#define WARN(condition, format...) ({ \ + int __ret_warn_on = !!(condition); \ + if (unlikely(__ret_warn_on)) \ + __WARN_printf(format); \ + unlikely(__ret_warn_on); \ +}) + +#define WARN_ONCE(condition, format...) ({ \ + static int __warned; \ + int __ret_warn_once = !!(condition); \ + \ + if (unlikely(__ret_warn_once)) \ + if (WARN(!__warned, format)) \ + __warned = 1; \ + unlikely(__ret_warn_once); \ +}) + #define min(x, y) ({ \ typeof(x) _min1 = (x); \ typeof(y) _min2 = (y); \ -- 1.7.11.7
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