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#include "tensorflow/core/lib/core/refcount.h"
#include "tensorflow/core/platform/logging.h"
namespace tensorflow {
namespace core {
RefCounted::RefCounted() : ref_(1) {}
RefCounted::~RefCounted() { DCHECK_EQ(ref_.load(), 0); }
void RefCounted::Ref() const {
DCHECK_GE(ref_.load(), 1);
ref_.fetch_add(1, std::memory_order_relaxed);
}
bool RefCounted::Unref() const {
DCHECK_GT(ref_.load(), 0);
// If ref_==1, this object is owned only by the caller. Bypass a locked op
// in that case.
if (ref_.load(std::memory_order_acquire) == 1 || ref_.fetch_sub(1) == 1) {
// Make DCHECK in ~RefCounted happy
DCHECK((ref_.store(0), true));
delete this;
return true;
} else {
return false;
}
}
bool RefCounted::RefCountIsOne() const {
return (ref_.load(std::memory_order_acquire) == 1);
}
} // namespace core
} // namespace tensorflow
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