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// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef sw_Resource_hpp
#define sw_Resource_hpp
#include "MutexLock.hpp"
namespace sw
{
enum Accessor
{
PUBLIC, // Application/API access
PRIVATE, // Renderer access, shared by multiple threads if read-only
MANAGED, // Renderer access, shared read/write access if partitioned
DESTRUCT
};
class Resource
{
public:
Resource(size_t bytes);
void destruct(); // Asynchronous destructor
void *lock(Accessor claimer);
void *lock(Accessor relinquisher, Accessor claimer);
void unlock();
void unlock(Accessor relinquisher);
const void *data() const;
const size_t size;
private:
~Resource(); // Always call destruct() instead
BackoffLock criticalSection;
Event unblock;
volatile int blocked;
volatile Accessor accessor;
volatile int count;
bool orphaned;
void *buffer;
};
}
#endif // sw_Resource_hpp