Merge master @ 353e5661de

1 files changed, 73 insertions, 0 deletions

diff --git a/src/mbgl/util/worker.cpp b/src/mbgl/util/worker.cpp
new file mode 100644
index 0000000000..3559cdd71f
--- /dev/null
+++ b/src/mbgl/util/worker.cpp
@@ -0,0 +1,73 @@
+#include <mbgl/util/worker.hpp>
+
+#include <cassert>
+
+namespace mbgl {
+
+Worker::Worker(uv_loop_t* loop, std::size_t count)
+    : queue(new Queue(loop, [this](Fn after) { afterWork(after); }))
+{
+    queue->unref();
+
+    for (std::size_t i = 0; i < count; i++) {
+        threads.emplace_back(&Worker::workLoop, this);
+    }
+}
+
+Worker::~Worker() {
+    MBGL_VERIFY_THREAD(tid);
+
+    if (active++ == 0) {
+        queue->ref();
+    }
+
+    channel.send(Work());
+
+    for (auto& thread : threads) {
+        thread.join();
+    }
+
+    queue->stop();
+}
+
+void Worker::send(Fn work, Fn after) {
+    MBGL_VERIFY_THREAD(tid);
+    assert(work);
+
+    if (active++ == 0) {
+        queue->ref();
+    }
+
+    channel.send({work, after});
+}
+
+void Worker::workLoop() {
+#ifdef __APPLE__
+    pthread_setname_np("Worker");
+#endif
+
+    while (true) {
+        Work item = channel.receive();
+
+        if (!item.work)
+            break;
+
+        item.work();
+        queue->send(std::move(item.after));
+    }
+
+    // Make sure to close all other workers too.
+    channel.send(Work());
+}
+
+void Worker::afterWork(Fn after) {
+    if (after) {
+        after();
+    }
+
+    if (--active == 0) {
+        queue->unref();
+    }
+}
+
+}