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Unified Diff: chrome/browser/net/url_info.cc

Issue 6780035: Use lock-free lazy initialization for static histogram references (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: '' Created 9 years, 9 months ago
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Index: chrome/browser/net/url_info.cc
===================================================================
--- chrome/browser/net/url_info.cc (revision 80382)
+++ chrome/browser/net/url_info.cc (working copy)
@@ -120,10 +120,11 @@
}
// Make a custom linear histogram for the region from 0 to boundary.
const size_t kBucketCount = 52;
- scoped_refptr<base::Histogram> histogram =
- base::LinearHistogram::FactoryTimeGet(
- "DNS.QueueRecycledUnder2", TimeDelta(), kBoundary, kBucketCount,
- base::Histogram::kUmaTargetedHistogramFlag);
+ static base::Histogram* histogram(NULL);
+ if (!histogram)
+ histogram = base::LinearHistogram::FactoryTimeGet(
+ "DNS.QueueRecycledUnder2", TimeDelta(), kBoundary, kBucketCount,
+ base::Histogram::kUmaTargetedHistogramFlag);
histogram->AddTime(queue_duration_);
}
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