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threadsafe_queue: Add WaitIfEmpty and use it in logging
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4327f430f1
commit
4154936568
@ -40,9 +40,7 @@ public:
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const Impl& operator=(Impl const&) = delete;
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const Impl& operator=(Impl const&) = delete;
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void PushEntry(Entry e) {
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void PushEntry(Entry e) {
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std::lock_guard<std::mutex> lock(message_mutex);
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message_queue.Push(std::move(e));
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message_queue.Push(std::move(e));
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message_cv.notify_one();
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}
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}
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void AddBackend(std::unique_ptr<Backend> backend) {
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void AddBackend(std::unique_ptr<Backend> backend) {
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@ -85,16 +83,13 @@ private:
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backend->Write(e);
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backend->Write(e);
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}
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}
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};
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};
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while (true) {
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while (message_queue.PopWait(entry)) {
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{
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if (entry.final_entry) {
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std::unique_lock<std::mutex> lock(message_mutex);
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message_cv.wait(lock, [&] { return !running || message_queue.Pop(entry); });
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}
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if (!running) {
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break;
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break;
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}
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}
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write_logs(entry);
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write_logs(entry);
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}
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}
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// Drain the logging queue. Only writes out up to MAX_LOGS_TO_WRITE to prevent a case
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// Drain the logging queue. Only writes out up to MAX_LOGS_TO_WRITE to prevent a case
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// where a system is repeatedly spamming logs even on close.
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// where a system is repeatedly spamming logs even on close.
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const int MAX_LOGS_TO_WRITE = filter.IsDebug() ? INT_MAX : 100;
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const int MAX_LOGS_TO_WRITE = filter.IsDebug() ? INT_MAX : 100;
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@ -106,14 +101,13 @@ private:
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}
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}
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~Impl() {
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~Impl() {
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running = false;
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Entry entry;
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message_cv.notify_one();
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entry.final_entry = true;
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message_queue.Push(entry);
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backend_thread.join();
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backend_thread.join();
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}
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}
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std::atomic_bool running{true};
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std::mutex writing_mutex;
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std::mutex message_mutex, writing_mutex;
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std::condition_variable message_cv;
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std::thread backend_thread;
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std::thread backend_thread;
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std::vector<std::unique_ptr<Backend>> backends;
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std::vector<std::unique_ptr<Backend>> backends;
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Common::MPSCQueue<Log::Entry> message_queue;
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Common::MPSCQueue<Log::Entry> message_queue;
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@ -27,6 +27,7 @@ struct Entry {
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unsigned int line_num;
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unsigned int line_num;
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std::string function;
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std::string function;
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std::string message;
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std::string message;
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bool final_entry = false;
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Entry() = default;
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Entry() = default;
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Entry(Entry&& o) = default;
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Entry(Entry&& o) = default;
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@ -8,6 +8,7 @@
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// single reader, single writer queue
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// single reader, single writer queue
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#include <atomic>
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#include <atomic>
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#include <condition_variable>
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#include <cstddef>
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#include <cstddef>
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#include <mutex>
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#include <mutex>
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#include <utility>
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#include <utility>
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@ -39,12 +40,13 @@ public:
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template <typename Arg>
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template <typename Arg>
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void Push(Arg&& t) {
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void Push(Arg&& t) {
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// create the element, add it to the queue
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// create the element, add it to the queue
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write_ptr->current = std::forward<Arg>(t);
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write_ptr->current = std::move(t);
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// set the next pointer to a new element ptr
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// set the next pointer to a new element ptr
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// then advance the write pointer
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// then advance the write pointer
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ElementPtr* new_ptr = new ElementPtr();
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ElementPtr* new_ptr = new ElementPtr();
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write_ptr->next.store(new_ptr, std::memory_order_release);
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write_ptr->next.store(new_ptr, std::memory_order_release);
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write_ptr = new_ptr;
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write_ptr = new_ptr;
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cv.notify_one();
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++size;
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++size;
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}
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}
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@ -67,6 +69,7 @@ public:
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--size;
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--size;
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ElementPtr* tmpptr = read_ptr;
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ElementPtr* tmpptr = read_ptr;
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read_ptr = tmpptr->next.load(std::memory_order_acquire);
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read_ptr = tmpptr->next.load(std::memory_order_acquire);
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t = std::move(tmpptr->current);
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t = std::move(tmpptr->current);
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tmpptr->next.store(nullptr);
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tmpptr->next.store(nullptr);
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@ -74,6 +77,14 @@ public:
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return true;
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return true;
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}
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}
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bool PopWait(T& t) {
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if (Empty()) {
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std::unique_lock<std::mutex> lock(cv_mutex);
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cv.wait(lock, [this]() { return !Empty(); });
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}
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return Pop(t);
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}
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// not thread-safe
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// not thread-safe
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void Clear() {
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void Clear() {
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size.store(0);
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size.store(0);
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@ -101,6 +112,8 @@ private:
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ElementPtr* write_ptr;
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ElementPtr* write_ptr;
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ElementPtr* read_ptr;
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ElementPtr* read_ptr;
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std::atomic_size_t size{0};
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std::atomic_size_t size{0};
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std::mutex cv_mutex;
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std::condition_variable cv;
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};
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};
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// a simple thread-safe,
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// a simple thread-safe,
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@ -135,6 +148,10 @@ public:
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return spsc_queue.Pop(t);
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return spsc_queue.Pop(t);
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}
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}
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bool PopWait(T& t) {
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return spsc_queue.PopWait(t);
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}
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// not thread-safe
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// not thread-safe
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void Clear() {
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void Clear() {
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spsc_queue.Clear();
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spsc_queue.Clear();
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