Fix hwuitask & RT priorities

Bug: 15993695

Change-Id: Ib6f07237cb834e8d10f3074f8fb206d27f91859a

libs/hwui/renderthread/RenderThread.cpp

@@ -18,6 +18,9 @@
 
 #include "RenderThread.h"
 
+#if defined(HAVE_PTHREADS)
+#include <sys/resource.h>
+#endif
 #include <gui/DisplayEventReceiver.h>
 #include <utils/Log.h>
 
@@ -244,6 +247,9 @@ void RenderThread::requestVsync() {
 }
 
 bool RenderThread::threadLoop() {
+#if defined(HAVE_PTHREADS)
+    setpriority(PRIO_PROCESS, 0, PRIORITY_DISPLAY);
+#endif
     initThreadLocals();
 
     int timeoutMillis = -1;

libs/hwui/thread/TaskManager.cpp

@@ -15,6 +15,9 @@
  */
 
 #include <sys/sysinfo.h>
+#if defined(HAVE_PTHREADS)
+#include <sys/resource.h>
+#endif
 
 #include "TaskManager.h"
 #include "Task.h"
@@ -79,6 +82,13 @@ bool TaskManager::addTaskBase(const sp<TaskBase>& task, const sp<TaskProcessorBa
 // Thread
 ///////////////////////////////////////////////////////////////////////////////
 
+status_t TaskManager::WorkerThread::readyToRun() {
+#if defined(HAVE_PTHREADS)
+    setpriority(PRIO_PROCESS, 0, PRIORITY_FOREGROUND);
+#endif
+    return NO_ERROR;
+}
+
 bool TaskManager::WorkerThread::threadLoop() {
     mSignal.wait();
     Vector<TaskWrapper> tasks;

libs/hwui/thread/TaskManager.h

@@ -84,6 +84,7 @@ private:
         void exit();
 
     private:
+        virtual status_t readyToRun();
         virtual bool threadLoop();
 
         // Lock for the list of tasks