blob: 32a0207c23ebaa0f3d0ac9edd7a29688a67c0e23 [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 "SkAtomics.h"
#include "SkEventTracer.h"
#include "SkOncePtr.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 gDefaultTracer.
static SkEventTracer* gUserTracer = nullptr;
SK_DECLARE_STATIC_ONCE_PTR(SkDefaultEventTracer, gDefaultTracer);
void SkEventTracer::SetInstance(SkEventTracer* tracer) {
SkASSERT(nullptr == sk_atomic_load(&gUserTracer, sk_memory_order_acquire));
sk_atomic_store(&gUserTracer, tracer, sk_memory_order_release);
// An atomic load during process shutdown is probably overkill, but safe overkill.
atexit([]() { delete sk_atomic_load(&gUserTracer, sk_memory_order_acquire); });
}
SkEventTracer* SkEventTracer::GetInstance() {
if (SkEventTracer* tracer = sk_atomic_load(&gUserTracer, sk_memory_order_acquire)) {
return tracer;
}
return gDefaultTracer.get([]{ return new SkDefaultEventTracer; });
}