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/*
* 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 "SkAtomics.h"
#include "SkEventTracer.h"
#include "SkOnce.h"
#include <stdlib.h>
class SkDefaultEventTracer : public SkEventTracer {
SkEventTracer::Handle
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; }
void
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* dummy = "dummy";
return dummy;
}
};
// We prefer gUserTracer if it's been set, otherwise we fall back on a default tracer;
static SkEventTracer* gUserTracer = nullptr;
bool SkEventTracer::SetInstance(SkEventTracer* tracer) {
SkEventTracer* expected = nullptr;
if (!sk_atomic_compare_exchange(&gUserTracer, &expected, tracer)) {
delete tracer;
return false;
}
// An atomic load during process shutdown is probably overkill, but safe overkill.
atexit([]() { delete sk_atomic_load(&gUserTracer); });
return true;
}
SkEventTracer* SkEventTracer::GetInstance() {
if (SkEventTracer* tracer = sk_atomic_load(&gUserTracer, sk_memory_order_acquire)) {
return tracer;
}
static SkOnce once;
static SkDefaultEventTracer* defaultTracer;
once([] { defaultTracer = new SkDefaultEventTracer; });
return defaultTracer;
}
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