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https://fuchsia.googlesource.com/third_party/pigweed.googlesource.com/pigweed/pigweed
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93 lines
2.6 KiB
C++
93 lines
2.6 KiB
C++
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// Copyright 2021 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://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, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include "pw_work_queue/work_queue.h"
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#include <mutex>
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#include "pw_assert/check.h"
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namespace pw::work_queue {
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void WorkQueue::RequestStop() {
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std::lock_guard lock(lock_);
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stop_requested_ = true;
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work_notification_.release();
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}
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void WorkQueue::Run() {
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while (true) {
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work_notification_.acquire();
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// Drain the work queue.
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bool stop_requested;
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bool work_remaining;
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do {
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std::optional<WorkItem> possible_work_item;
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{
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std::lock_guard lock(lock_);
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possible_work_item = circular_buffer_.Pop();
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work_remaining = !circular_buffer_.empty();
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stop_requested = stop_requested_;
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}
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if (!possible_work_item.has_value()) {
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continue; // No work item to process.
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}
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WorkItem& work_item = possible_work_item.value();
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PW_CHECK(work_item != nullptr);
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work_item();
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} while (work_remaining);
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// Queue was drained, return if we've been requested to stop.
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if (stop_requested) {
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return;
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}
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}
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}
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void WorkQueue::CheckPushWork(WorkItem work_item) {
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PW_CHECK_OK(InternalPushWork(std::move(work_item)),
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"Failed to push work item into the work queue");
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}
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Status WorkQueue::InternalPushWork(WorkItem work_item) {
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std::lock_guard lock(lock_);
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if (stop_requested_) {
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// Entries are not permitted to be enqueued once stop has been requested.
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return Status::FailedPrecondition();
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}
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if (circular_buffer_.full()) {
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return Status::ResourceExhausted();
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}
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circular_buffer_.Push(std::move(work_item));
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// Update the watermarks for the queue.
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const uint32_t queue_entries = circular_buffer_.size();
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if (queue_entries > max_queue_used_.value()) {
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max_queue_used_.Set(queue_entries);
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}
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const uint32_t queue_remaining = circular_buffer_.capacity() - queue_entries;
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if (queue_remaining < min_queue_remaining_.value()) {
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min_queue_remaining_.Set(queue_entries);
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}
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work_notification_.release();
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return OkStatus();
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}
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} // namespace pw::work_queue
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