blob: d07e567211ef1192c4c8a62cae37746c13c80361 [file] [log] [blame]
* Copyright 2014 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include "include/utils/SkEventTracer.h"
#include "include/private/SkOnce.h"
#include <stdlib.h>
#include <atomic>
class SkDefaultEventTracer : public SkEventTracer {
addTraceEvent(char phase,
const uint8_t* categoryEnabledFlag,
const char* name,
uint64_t id,
int numArgs,
const char** argNames,
const uint8_t* argTypes,
const uint64_t* argValues,
uint8_t flags) override { return 0; }
updateTraceEventDuration(const uint8_t* categoryEnabledFlag,
const char* name,
SkEventTracer::Handle handle) override {}
const uint8_t* getCategoryGroupEnabled(const char* name) override {
static uint8_t no = 0;
return &no;
const char* getCategoryGroupName(
const uint8_t* categoryEnabledFlag) override {
static const char* stub = "stub";
return stub;
// The default tracer does not yet support splitting up trace output into sections.
void newTracingSection(const char* name) override {}
// We prefer gUserTracer if it's been set, otherwise we fall back on a default tracer;
static std::atomic<SkEventTracer*> gUserTracer{nullptr};
bool SkEventTracer::SetInstance(SkEventTracer* tracer, bool leakTracer) {
SkEventTracer* expected = nullptr;
if (!gUserTracer.compare_exchange_strong(expected, tracer)) {
delete tracer;
return false;
// If leaking the tracer is accepted then there is no need to install
// the atexit.
if (!leakTracer) {
atexit([]() { delete gUserTracer.load(); });
return true;
SkEventTracer* SkEventTracer::GetInstance() {
if (auto tracer = gUserTracer.load(std::memory_order_acquire)) {
return tracer;
static SkOnce once;
static SkDefaultEventTracer* defaultTracer;
once([] { defaultTracer = new SkDefaultEventTracer; });
return defaultTracer;