Fix multiple backporting errors

src/util.h

@@ -28,6 +28,12 @@
 #include <boost/signals2/signal.hpp>
 #include <boost/thread/exceptions.hpp>
 
+#ifndef WIN32
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#endif
+
 // Application startup time (used for uptime calculation)
 int64_t GetStartupTime();
 
@@ -219,6 +225,30 @@ std::string HelpMessageOpt(const std::string& option, const std::string& message
  */
 int GetNumCores();
 
+#ifdef WIN32
+inline void SetThreadPriority(int nPriority)
+{
+    SetThreadPriority(GetCurrentThread(), nPriority);
+}
+#else
+
+#define THREAD_PRIORITY_LOWEST          PRIO_MAX
+#define THREAD_PRIORITY_BELOW_NORMAL    2
+#define THREAD_PRIORITY_NORMAL          0
+#define THREAD_PRIORITY_ABOVE_NORMAL    0
+
+inline void SetThreadPriority(int nPriority)
+{
+    // It's unclear if it's even possible to change thread priorities on Linux,
+    // but we really and truly need it for the generation threads.
+#ifdef PRIO_THREAD
+    setpriority(PRIO_THREAD, 0, nPriority);
+#else
+    setpriority(PRIO_PROCESS, 0, nPriority);
+#endif
+}
+#endif
+
 void RenameThread(const char* name);
 
 /**