File: histogram_scope.cc

package info (click to toggle)
chromium 139.0.7258.127-1
  • links: PTS, VCS
  • area: main
  • in suites:
  • size: 6,122,068 kB
  • sloc: cpp: 35,100,771; ansic: 7,163,530; javascript: 4,103,002; python: 1,436,920; asm: 946,517; xml: 746,709; pascal: 187,653; perl: 88,691; sh: 88,436; objc: 79,953; sql: 51,488; cs: 44,583; fortran: 24,137; makefile: 22,147; tcl: 15,277; php: 13,980; yacc: 8,984; ruby: 7,485; awk: 3,720; lisp: 3,096; lex: 1,327; ada: 727; jsp: 228; sed: 36
file content (33 lines) | stat: -rw-r--r-- 753 bytes parent folder | download | duplicates (6) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
 
// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/trace_event/histogram_scope.h"

#include "base/check_op.h"

namespace base::trace_event {
namespace {

thread_local uint64_t g_histogram_flow_id = 0;

}

HistogramScope::HistogramScope(uint64_t flow_id) : flow_id_(flow_id) {
  DCHECK_EQ(g_histogram_flow_id, 0U);
  g_histogram_flow_id = flow_id_;
}

HistogramScope::~HistogramScope() {
  DCHECK_EQ(g_histogram_flow_id, flow_id_);
  g_histogram_flow_id = 0;
}

std::optional<uint64_t> HistogramScope::GetFlowId() {
  if (g_histogram_flow_id == 0) {
    return std::nullopt;
  }
  return g_histogram_flow_id;
}

}  // namespace base::trace_event