Skeleton of DM

dm/DMTaskRunner.cpp

Index: dm/DMTaskRunner.cpp
diff --git a/dm/DMTaskRunner.cpp b/dm/DMTaskRunner.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..5661ea2ca79196796f84950df1bbb8516f3aa005
--- /dev/null
+++ b/dm/DMTaskRunner.cpp
@@ -0,0 +1,28 @@
+#include "DMTaskRunner.h"
+#include "DMTask.h"
+
+namespace DM {
+
+TaskRunner::TaskRunner(int cputhreads, int gpuThreads)
+    : fMain(SkNEW_ARGS(SkThreadPool, (cputhreads)))
+    , fGpu(SkNEW_ARGS(SkThreadPool, (gpuThreads)))
+    {}
+
+void TaskRunner::add(Task* task) {
+    if (task->usesGpu()) {
+        fGpu->add(task);
+    } else {
+        fMain->add(task);
+    }
+}
+
+void TaskRunner::wait() {
+    // These free calls block until the threadpool is done.  We don't allow

[epoger, 2013/10/11 21:13:13]

Thanks for the commentary!

+    // children to spawn new GPU tasks so we can wait for that first knowing
+    // we'll never try to add to it later.  Same can't be said of fMain: fGpu
+    // and fMain can both add tasks to fMain, so we have to wait for that last.
+    fGpu.free();
+    fMain.free();
+}
+
+}  // namespace DM