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68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_TASK_TASK_SCHEDULER_SCHEDULER_WORKER_STACK_H_
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#define BASE_TASK_TASK_SCHEDULER_SCHEDULER_WORKER_STACK_H_
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#include <stddef.h>
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#include <vector>
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#include "base/base_export.h"
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#include "base/macros.h"
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namespace base {
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namespace internal {
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class SchedulerWorker;
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// A stack of SchedulerWorkers which has custom logic to treat the worker on top
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// of the stack as being "in-use" (so its time in that position doesn't count
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// towards being inactive / reclaimable). Supports removal of arbitrary
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// SchedulerWorkers. DCHECKs when a SchedulerWorker is inserted multiple times.
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// SchedulerWorkers are not owned by the stack. Push() is amortized O(1). Pop(),
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// Peek(), Size() and Empty() are O(1). Contains() and Remove() are O(n). This
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// class is NOT thread-safe.
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class BASE_EXPORT SchedulerWorkerStack {
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public:
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SchedulerWorkerStack();
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~SchedulerWorkerStack();
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// Inserts |worker| at the top of the stack. |worker| must not already be on
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// the stack. Flags the SchedulerWorker previously on top of the stack, if
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// any, as unused.
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void Push(SchedulerWorker* worker);
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// Removes the top SchedulerWorker from the stack and returns it. Returns
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// nullptr if the stack is empty. Flags the SchedulerWorker now on top of the
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// stack, if any, as being in-use.
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SchedulerWorker* Pop();
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// Returns the top SchedulerWorker from the stack, nullptr if empty.
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SchedulerWorker* Peek() const;
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// Returns true if |worker| is already on the stack.
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bool Contains(const SchedulerWorker* worker) const;
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// Removes |worker| from the stack. Must not be invoked for the first worker
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// on the stack.
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void Remove(const SchedulerWorker* worker);
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// Returns the number of SchedulerWorkers on the stack.
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size_t Size() const { return stack_.size(); }
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// Returns true if the stack is empty.
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bool IsEmpty() const { return stack_.empty(); }
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private:
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std::vector<SchedulerWorker*> stack_;
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DISALLOW_COPY_AND_ASSIGN(SchedulerWorkerStack);
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};
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} // namespace internal
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} // namespace base
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#endif // BASE_TASK_TASK_SCHEDULER_SCHEDULER_WORKER_STACK_H_
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