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Add DequeuePlusAction

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This commit is contained in:
Jacob Dufault 2017-07-28 17:07:27 -07:00
parent c37396a36d
commit 7b052d887d
1 changed files with 12 additions and 2 deletions
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12
src/threaded_queue.h
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@ -94,7 +94,9 @@ public:
} }
// Get the first element from the queue. Blocks until one is available. // Get the first element from the queue. Blocks until one is available.
T Dequeue() { // Executes |action| with an acquired |mutex_|.
template<typename TAction>
T DequeuePlusAction(TAction& action) {
std::unique_lock<std::mutex> lock(mutex_); std::unique_lock<std::mutex> lock(mutex_);
waiter_->cv.wait(lock, [&]() { waiter_->cv.wait(lock, [&]() {
return !priority_.empty() || !queue_.empty(); return !priority_.empty() || !queue_.empty();
@ -108,9 +110,17 @@ public:
auto val = std::move(queue_.front()); auto val = std::move(queue_.front());
queue_.pop(); queue_.pop();
action();
return std::move(val); return std::move(val);
} }
// Get the first element from the queue. Blocks until one is available.
T Dequeue() {
return DequeuePlusAction([]() {});
}
// Get the first element from the queue without blocking. Returns a null // Get the first element from the queue without blocking. Returns a null
// value if the queue is empty. // value if the queue is empty.
optional<T> TryDequeue() { optional<T> TryDequeue() {