| 1 | // Copyright (C) Microsoft Corporation. All rights reserved. |
| 2 | #include "precomp.h" |
| 3 | #include "p9lx.h" |
| 4 | using namespace std::chrono_literals; |
| 5 | |
| 6 | namespace p9fs { |
| 7 | |
| 8 | constexpr auto ThreadPoolTimeout = 10s; |
| 9 | |
| 10 | ThreadPool g_ThreadPool; |
| 11 | |
| 12 | // Create a socket class with a socket fd. |
| 13 | Socket::Socket(int socket) : m_Io{g_Watcher} |
| 14 | { |
| 15 | Reset(socket); |
| 16 | } |
| 17 | |
| 18 | // Asynchronously wait for new connections. |
| 19 | Task<std::unique_ptr<ISocket>> Socket::AcceptAsync(CancelToken& token) |
| 20 | { |
| 21 | int socket = co_await p9fs::AcceptAsync(m_Io, token); |
| 22 | co_return std::make_unique<Socket>(socket); |
| 23 | } |
| 24 | |
| 25 | // Asynchronously receive data. |
| 26 | Task<size_t> Socket::RecvAsync(gsl::span<gsl::byte> buffer, CancelToken& token) |
| 27 | { |
| 28 | return p9fs::RecvAsync(m_Io, buffer, token); |
| 29 | } |
| 30 | |
| 31 | // Asynchronously send data. |
| 32 | Task<size_t> Socket::SendAsync(gsl::span<const gsl::byte> buffer, CancelToken& token) |
| 33 | { |
| 34 | size_t totalSent{}; |
| 35 | do |
| 36 | { |
| 37 | totalSent += co_await p9fs::SendAsync(m_Io, buffer.subspan(totalSent), token); |
| 38 | } while (totalSent < buffer.size()); |
| 39 | |
| 40 | co_return totalSent; |
| 41 | } |
| 42 | |
| 43 | void Socket::Reset(int socket) |
| 44 | { |
| 45 | m_Io.Reset(socket); |
| 46 | m_Socket.reset(socket); |
| 47 | } |
| 48 | |
| 49 | // Create a new work item for a specific callback. |
| 50 | WorkItem::WorkItem(std::function<void()> callback) : m_Callback{callback} |
| 51 | { |
| 52 | } |
| 53 | |
| 54 | // Submit the work item to the thread pool. |
| 55 | void WorkItem::Submit() |
| 56 | { |
| 57 | g_ThreadPool.SubmitWork(m_Callback); |
| 58 | } |
| 59 | |
| 60 | // Create a new work item for a specific callback. |
| 61 | std::unique_ptr<IWorkItem> CreateWorkItem(std::function<void()> callback) |
| 62 | { |
| 63 | return std::make_unique<WorkItem>(callback); |
| 64 | } |
| 65 | |
| 66 | // Create a new thread pool. |
| 67 | ThreadPool::ThreadPool() : m_MaxThreads{std::thread::hardware_concurrency()} |
| 68 | { |
| 69 | } |
| 70 | |
| 71 | // Submit work to the thread pool. |
| 72 | void ThreadPool::SubmitWork(std::function<void()> callback) |
| 73 | { |
| 74 | std::lock_guard<std::mutex> lock{m_Lock}; |
| 75 | m_WorkQueue.push(callback); |
| 76 | // If there are no threads to run the work right now, and it's not at the |
| 77 | // max, start a new thread. |
| 78 | if (m_AvailableThreads == 0 && m_RunningThreads < m_MaxThreads) |
| 79 | { |
| 80 | ++m_RunningThreads; |
| 81 | std::thread(&ThreadPool::WorkerCallback, this).detach(); |
| 82 | } |
| 83 | else |
| 84 | { |
| 85 | m_Condition.notify_one(); |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | // Runs a worker thread that executes queued work items. |
| 90 | void ThreadPool::WorkerCallback() |
| 91 | { |
| 92 | std::unique_lock<std::mutex> lock{m_Lock, std::defer_lock}; |
| 93 | for (;;) |
| 94 | { |
| 95 | lock.lock(); |
| 96 | ++m_AvailableThreads; |
| 97 | // Wait for work. |
| 98 | if (m_WorkQueue.empty() && !m_Condition.wait_for(lock, ThreadPoolTimeout, [this]() { return !m_WorkQueue.empty(); })) |
| 99 | { |
| 100 | // The wait timed out, so shut down this thread. |
| 101 | --m_AvailableThreads; |
| 102 | --m_RunningThreads; |
| 103 | return; |
| 104 | } |
| 105 | |
| 106 | // Take ownership of the work item. |
| 107 | --m_AvailableThreads; |
| 108 | auto work = m_WorkQueue.front(); |
| 109 | m_WorkQueue.pop(); |
| 110 | lock.unlock(); |
| 111 | |
| 112 | // Run the work outside the lock. |
| 113 | work(); |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | } // namespace p9fs |