Consistently use call_once to initialize static metrics.

[nageru] / quicksync_encoder.cpp

diff --git a/quicksync_encoder.cpp b/quicksync_encoder.cpp
index 0c9cf0640446f39df3dcdfca27f0d16f584a50d2..1b36aa5246fbda3b19b5e65a5abc48365ab23840 100644 (file)
--- a/quicksync_encoder.cpp
+++ b/quicksync_encoder.cpp
@@ -68,7 +68,7 @@ namespace {
 
 // These need to survive several QuickSyncEncoderImpl instances,
 // so they are outside.
-bool quick_sync_metrics_inited = false;
+once_flag quick_sync_metrics_inited;
 LatencyHistogram mixer_latency_histogram, qs_latency_histogram;
 MuxMetrics current_file_mux_metrics, total_mux_metrics;
 std::atomic<double> metric_current_file_start_time_seconds{0.0 / 0.0};
@@ -1573,15 +1573,14 @@ QuickSyncEncoderImpl::QuickSyncEncoderImpl(const std::string &filename, Resource
                memset(&slice_param, 0, sizeof(slice_param));
        }
 
-       if (!quick_sync_metrics_inited) {
+       call_once(quick_sync_metrics_inited, [](){
                mixer_latency_histogram.init("mixer");
                qs_latency_histogram.init("quick_sync");
                current_file_mux_metrics.init({{ "destination", "current_file" }});
                total_mux_metrics.init({{ "destination", "files_total" }});
                global_metrics.add("current_file_start_time_seconds", &metric_current_file_start_time_seconds, Metrics::TYPE_GAUGE);
                global_metrics.add("quick_sync_stalled_frames", &metric_quick_sync_stalled_frames);
-               quick_sync_metrics_inited = true;
-       }
+       });
 
        storage_thread = thread(&QuickSyncEncoderImpl::storage_task_thread, this);