From 123c5df92219bde3dda39d3ba942b996e765e8e9 Mon Sep 17 00:00:00 2001
From: "Thiago Marcos P. Santos" <thiago@mapbox.com>
Date: Mon, 31 Aug 2015 10:41:52 +0300
Subject: [PATCH] [core] Introduce the AsyncTask

---
 gyp/platform-android.gypi       |  1 +
 gyp/platform-ios.gypi           |  2 ++
 gyp/platform-linux.gypi         |  1 +
 gyp/platform-osx.gypi           |  1 +
 platform/default/async_task.cpp | 53 +++++++++++++++++++++++++++++++++
 src/mbgl/util/async_task.hpp    | 28 +++++++++++++++++
 6 files changed, 86 insertions(+)
 create mode 100644 platform/default/async_task.cpp
 create mode 100644 src/mbgl/util/async_task.hpp

diff --git a/gyp/platform-android.gypi b/gyp/platform-android.gypi
index e3e1141c5..dcab0e019 100644
--- a/gyp/platform-android.gypi
+++ b/gyp/platform-android.gypi
@@ -12,6 +12,7 @@
       'sources': [
         '../platform/android/log_android.cpp',
         '../platform/android/asset_root.cpp',
+        '../platform/default/async_task.cpp',
         '../platform/default/thread.cpp',
         '../platform/default/string_stdlib.cpp',
         '../platform/default/image.cpp',
diff --git a/gyp/platform-ios.gypi b/gyp/platform-ios.gypi
index 205cfe22d..0b23890c4 100644
--- a/gyp/platform-ios.gypi
+++ b/gyp/platform-ios.gypi
@@ -10,6 +10,7 @@
       ],
 
       'sources': [
+        '../platform/default/async_task.cpp',
         '../platform/darwin/log_nslog.mm',
         '../platform/darwin/string_nsstring.mm',
         '../platform/darwin/application_root.mm',
@@ -93,6 +94,7 @@
 
       'include_dirs': [
         '../include',
+        '../src',
       ],
 
       'xcode_settings': {
diff --git a/gyp/platform-linux.gypi b/gyp/platform-linux.gypi
index 3ee39e2b7..1ba328c5c 100644
--- a/gyp/platform-linux.gypi
+++ b/gyp/platform-linux.gypi
@@ -10,6 +10,7 @@
       ],
 
       'sources': [
+        '../platform/default/async_task.cpp',
         '../platform/default/log_stderr.cpp',
         '../platform/default/string_stdlib.cpp',
         '../platform/default/application_root.cpp',
diff --git a/gyp/platform-osx.gypi b/gyp/platform-osx.gypi
index af30019ee..b3941d2e2 100644
--- a/gyp/platform-osx.gypi
+++ b/gyp/platform-osx.gypi
@@ -10,6 +10,7 @@
       ],
 
       'sources': [
+        '../platform/default/async_task.cpp',
         '../platform/darwin/log_nslog.mm',
         '../platform/darwin/string_nsstring.mm',
         '../platform/darwin/application_root.mm',
diff --git a/platform/default/async_task.cpp b/platform/default/async_task.cpp
new file mode 100644
index 000000000..4b4372451
--- /dev/null
+++ b/platform/default/async_task.cpp
@@ -0,0 +1,53 @@
+#include <mbgl/util/async_task.hpp>
+
+#include <mbgl/util/run_loop.hpp>
+#include <mbgl/util/uv_detail.hpp>
+
+#include <atomic>
+#include <functional>
+
+namespace mbgl {
+namespace util {
+
+class AsyncTask::Impl {
+public:
+    Impl(std::function<void()>&& fn)
+        : async(RunLoop::getLoop(), [this] { runTask(); })
+        , task(std::move(fn)) {
+    }
+
+    void maySend() {
+        async.send();
+    }
+
+    void runTask() {
+        task();
+    }
+
+    void unref() {
+        async.unref();
+    }
+
+private:
+    uv::async async;
+
+    std::function<void()> task;
+};
+
+AsyncTask::AsyncTask(std::function<void()>&& fn)
+    : impl(std::make_unique<Impl>(std::move(fn))) {
+}
+
+AsyncTask::~AsyncTask() {
+}
+
+void AsyncTask::send() {
+    impl->maySend();
+}
+
+void AsyncTask::unref() {
+    impl->unref();
+}
+
+}
+}
diff --git a/src/mbgl/util/async_task.hpp b/src/mbgl/util/async_task.hpp
new file mode 100644
index 000000000..09bdab94d
--- /dev/null
+++ b/src/mbgl/util/async_task.hpp
@@ -0,0 +1,28 @@
+#ifndef MBGL_UTIL_ASYNC_TASK
+#define MBGL_UTIL_ASYNC_TASK
+
+#include <mbgl/util/noncopyable.hpp>
+
+#include <memory>
+#include <functional>
+
+namespace mbgl {
+namespace util {
+
+class AsyncTask : private util::noncopyable {
+public:
+    AsyncTask(std::function<void()>&&);
+    ~AsyncTask();
+
+    void send();
+    void unref();
+
+private:
+    class Impl;
+    std::unique_ptr<Impl> impl;
+};
+
+}
+}
+
+#endif