diff options
Diffstat (limited to 'base/debug/trace_event.h')
| -rw-r--r-- | base/debug/trace_event.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/base/debug/trace_event.h b/base/debug/trace_event.h index abd3901..aa4cc75 100644 --- a/base/debug/trace_event.h +++ b/base/debug/trace_event.h @@ -678,6 +678,22 @@ } \ } while (0) +// Macro to efficiently determine, through polling, if a new trace has begun. +#define TRACE_EVENT_IS_NEW_TRACE(ret) \ + do { \ + static int INTERNAL_TRACE_EVENT_UID(lastRecordingNumber) = 0; \ + int num_traces_recorded = TRACE_EVENT_API_GET_NUM_TRACES_RECORDED(); \ + if (num_traces_recorded != -1 && \ + num_traces_recorded != \ + INTERNAL_TRACE_EVENT_UID(lastRecordingNumber)) { \ + INTERNAL_TRACE_EVENT_UID(lastRecordingNumber) = \ + num_traces_recorded; \ + *ret = true; \ + } else { \ + *ret = false; \ + } \ + } while (0) + //////////////////////////////////////////////////////////////////////////////// // Implementation specific tracing API definitions. @@ -694,6 +710,12 @@ #define TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED \ base::debug::TraceLog::GetCategoryGroupEnabled +// Get the number of times traces have been recorded. This is used to implement +// the TRACE_EVENT_IS_NEW_TRACE facility. +// unsigned int TRACE_EVENT_API_GET_NUM_TRACES_RECORDED() +#define TRACE_EVENT_API_GET_NUM_TRACES_RECORDED \ + base::debug::TraceLog::GetInstance()->GetNumTracesRecorded + // Add a trace event to the platform tracing system. // void TRACE_EVENT_API_ADD_TRACE_EVENT( // char phase, |