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use acquire/release in SkEventTracer.cpp

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BUG=chromium:437044

Review URL: https://codereview.chromium.org/1091283006
This commit is contained in:
mtklein 2015-04-22 20:30:12 -07:00 committed by Commit bot
parent 473ffa179a
commit 743be194ed
1 changed files with 4 additions and 7 deletions
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11
src/utils/SkEventTracer.cpp
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@ -41,18 +41,15 @@ class SkDefaultEventTracer : public SkEventTracer {
static SkEventTracer* gUserTracer = nullptr;
SK_DECLARE_STATIC_LAZY_PTR(SkDefaultEventTracer, gDefaultTracer);
// We can use relaxed memory order for gUserTracer loads and stores.
// It's not guarding anything but itself.
void SkEventTracer::SetInstance(SkEventTracer* tracer) {
SkASSERT(nullptr == sk_atomic_load(&gUserTracer, sk_memory_order_relaxed));
sk_atomic_store(&gUserTracer, tracer, sk_memory_order_relaxed);
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([](){ SkDELETE(sk_atomic_load(&gUserTracer, sk_memory_order_relaxed)); });
atexit([](){ SkDELETE(sk_atomic_load(&gUserTracer, sk_memory_order_acquire)); });
}
SkEventTracer* SkEventTracer::GetInstance() {
if (SkEventTracer* tracer = sk_atomic_load(&gUserTracer, sk_memory_order_relaxed)) {
if (SkEventTracer* tracer = sk_atomic_load(&gUserTracer, sk_memory_order_acquire)) {
return tracer;
}
return gDefaultTracer.get();