Adds sample4_unittest to scons (by Vlad Losev); adds logic for getting the thread count on Mac (by Vlad Losev); adds HasFailure() and HasNonfatalFailure() (by Zhanyong Wan).

include/gtest/gtest.h

@@ -272,6 +272,13 @@ class Test {
   // Returns true iff the current test has a fatal failure.
   static bool HasFatalFailure();
 
+  // Returns true iff the current test has a non-fatal failure.
+  static bool HasNonfatalFailure();
+
+  // Returns true iff the current test has a (either fatal or
+  // non-fatal) failure.
+  static bool HasFailure() { return HasFatalFailure() || HasNonfatalFailure(); }
+
   // Logs a property for the current test.  Only the last value for a given
   // key is remembered.
   // These are public static so they can be called from utility functions

include/gtest/internal/gtest-port.h

@@ -673,9 +673,9 @@ class ThreadLocal {
   T value_;
 };
 
-// There's no portable way to detect the number of threads, so we just
-// return 0 to indicate that we cannot detect it.
-inline size_t GetThreadCount() { return 0; }
+// Returns the number of threads running in the process, or 0 to indicate that
+// we cannot detect it.
+size_t GetThreadCount();
 
 // The above synchronization primitives have dummy implementations.
 // Therefore Google Test is not thread-safe.