// Copyright 2017 The Crashpad Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef CRASHPAD_UTIL_STDLIB_THREAD_SAFE_VECTOR_H_
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#define CRASHPAD_UTIL_STDLIB_THREAD_SAFE_VECTOR_H_
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#include <utility>
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#include <vector>
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#include "base/macros.h"
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#include "base/synchronization/lock.h"
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namespace crashpad {
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//! \brief A wrapper for a `std::vector<>` that can be accessed safely from
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//! multiple threads.
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//!
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//! This is not a drop-in replacement for `std::vector<>`. Only necessary
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//! operations are defined.
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template <typename T>
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class ThreadSafeVector {
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public:
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ThreadSafeVector() : vector_(), lock_() {}
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~ThreadSafeVector() {}
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//! \brief Wraps `std::vector<>::%push_back()`.
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void PushBack(const T& element) {
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base::AutoLock lock_owner(lock_);
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vector_.push_back(element);
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}
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//! \brief Atomically clears the underlying vector and returns its previous
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//! contents.
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std::vector<T> Drain() {
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std::vector<T> contents;
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{
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base::AutoLock lock_owner(lock_);
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std::swap(vector_, contents);
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}
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return contents;
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}
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private:
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std::vector<T> vector_;
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base::Lock lock_;
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DISALLOW_COPY_AND_ASSIGN(ThreadSafeVector);
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};
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_STDLIB_THREAD_SAFE_VECTOR_H_
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