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Side by Side Diff: base/task_scheduler/scheduler_worker_thread_stack.h

Issue 2077093002: Rename SchedulerWorkerThread* to SchedulerWorker* (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@rename2
Patch Set: CR Feedback Created 4 years, 6 months ago
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1 // Copyright 2016 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef BASE_TASK_SCHEDULER_SCHEDULER_WORKER_THREAD_STACK_H_
6 #define BASE_TASK_SCHEDULER_SCHEDULER_WORKER_THREAD_STACK_H_
7
8 #include <stddef.h>
9
10 #include <vector>
11
12 #include "base/base_export.h"
13 #include "base/macros.h"
14
15 namespace base {
16 namespace internal {
17
18 class SchedulerWorkerThread;
19
20 // A stack of SchedulerWorkerThreads. Supports removal of arbitrary
21 // SchedulerWorkerThreads. DCHECKs when a SchedulerWorkerThread is inserted
22 // multiple times. SchedulerWorkerThreads are not owned by the stack. Push() is
23 // amortized O(1). Pop(), Size() and Empty() are O(1). Remove is O(n). This
24 // class is NOT thread-safe.
25 class BASE_EXPORT SchedulerWorkerThreadStack {
26 public:
27 SchedulerWorkerThreadStack();
28 ~SchedulerWorkerThreadStack();
29
30 // Inserts |worker_thread| at the top of the stack. |worker_thread| must not
31 // already be on the stack.
32 void Push(SchedulerWorkerThread* worker_thread);
33
34 // Removes the top SchedulerWorkerThread from the stack and returns it.
35 // Returns nullptr if the stack is empty.
36 SchedulerWorkerThread* Pop();
37
38 // Removes |worker_thread| from the stack.
39 void Remove(const SchedulerWorkerThread* worker_thread);
40
41 // Returns the number of SchedulerWorkerThreads on the stack.
42 size_t Size() const { return stack_.size(); }
43
44 // Returns true if the stack is empty.
45 bool IsEmpty() const { return stack_.empty(); }
46
47 private:
48 std::vector<SchedulerWorkerThread*> stack_;
49
50 DISALLOW_COPY_AND_ASSIGN(SchedulerWorkerThreadStack);
51 };
52
53 } // namespace internal
54 } // namespace base
55
56 #endif // BASE_TASK_SCHEDULER_SCHEDULER_WORKER_THREAD_STACK_H_
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