From 6232d13f5321b87ddf12a1aa36b4545da45f173d Mon Sep 17 00:00:00 2001
From: Joel Klinghed <the_jk@spawned.biz>
Date: Wed, 17 Nov 2021 22:34:57 +0100
Subject: Travel3: Simple image and video display site

Reads the images and videos from filesystem and builds a site in
memroy.
---
 src/task_runner_looper.cc | 75 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 src/task_runner_looper.cc

(limited to 'src/task_runner_looper.cc')

diff --git a/src/task_runner_looper.cc b/src/task_runner_looper.cc
new file mode 100644
index 0000000..4c1292b
--- /dev/null
+++ b/src/task_runner_looper.cc
@@ -0,0 +1,75 @@
+#include "common.hh"
+
+#include <deque>
+#include <mutex>
+
+#include "io.hh"
+#include "looper.hh"
+#include "task_runner.hh"
+#include "unique_pipe.hh"
+
+namespace {
+
+constexpr char kMessage = 1;
+
+class TaskRunnerLooper : public TaskRunner {
+public:
+  explicit TaskRunnerLooper(std::shared_ptr<Looper> looper)
+    : looper_(looper), pipe_(true, false) {
+    looper_->add(pipe_.reader(), Looper::EVENT_READ,
+                 std::bind(&TaskRunnerLooper::run, this,
+                           std::placeholders::_1));
+  }
+
+  ~TaskRunnerLooper() override {
+    looper_->remove(pipe_.reader());
+  }
+
+  void post(std::function<void()> callback) override {
+    bool notify;
+    {
+      std::lock_guard<std::mutex> lock(mutex_);
+      notify = queue_.empty();
+      queue_.push_back(std::move(callback));
+    }
+    if (notify)
+      io::write_all(pipe_.writer(), &kMessage, 1);
+  }
+
+private:
+  void run(uint8_t event) {
+    if (event & Looper::EVENT_READ) {
+      char in[1];
+      io::read_all(pipe_.reader(), &in, 1);
+    }
+    if (event & Looper::EVENT_ERROR) {
+      assert(false);
+      looper_->quit();
+    }
+    bool more;
+    do {
+      std::function<void()> callback;
+      {
+        std::lock_guard<std::mutex> lock(mutex_);
+        if (queue_.empty())
+          break;
+        callback = std::move(queue_.front());
+        queue_.pop_front();
+        more = !queue_.empty();
+      }
+      callback();
+    } while (more);
+  }
+
+  std::shared_ptr<Looper> looper_;
+  unique_pipe pipe_;
+  std::mutex mutex_;
+  std::deque<std::function<void()>> queue_;
+};
+
+}  // namespace
+
+std::unique_ptr<TaskRunner> TaskRunner::create(std::shared_ptr<Looper> looper) {
+  return std::make_unique<TaskRunnerLooper>(looper);
+}
+
-- 
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