/*
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* Copyright 2014 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkEventTracer.h"
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#include "SkOnce.h"
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#include <atomic>
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#include <stdlib.h>
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class SkDefaultEventTracer : public SkEventTracer {
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SkEventTracer::Handle
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addTraceEvent(char phase,
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const uint8_t* categoryEnabledFlag,
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const char* name,
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uint64_t id,
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int numArgs,
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const char** argNames,
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const uint8_t* argTypes,
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const uint64_t* argValues,
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uint8_t flags) override { return 0; }
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void
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updateTraceEventDuration(const uint8_t* categoryEnabledFlag,
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const char* name,
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SkEventTracer::Handle handle) override {}
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const uint8_t* getCategoryGroupEnabled(const char* name) override {
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static uint8_t no = 0;
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return &no;
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}
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const char* getCategoryGroupName(
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const uint8_t* categoryEnabledFlag) override {
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static const char* dummy = "dummy";
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return dummy;
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}
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};
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// We prefer gUserTracer if it's been set, otherwise we fall back on a default tracer;
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static std::atomic<SkEventTracer*> gUserTracer{nullptr};
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bool SkEventTracer::SetInstance(SkEventTracer* tracer) {
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SkEventTracer* expected = nullptr;
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if (!gUserTracer.compare_exchange_strong(expected, tracer)) {
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delete tracer;
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return false;
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}
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atexit([]() { delete gUserTracer.load(); });
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return true;
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}
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SkEventTracer* SkEventTracer::GetInstance() {
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if (auto tracer = gUserTracer.load(std::memory_order_acquire)) {
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return tracer;
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}
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static SkOnce once;
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static SkDefaultEventTracer* defaultTracer;
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once([] { defaultTracer = new SkDefaultEventTracer; });
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return defaultTracer;
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}
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