X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2FProcess.cpp;h=2c0d37bb32992720ec37892e1415abc4272f9167;hb=55ec2218c448ef9e0d09b5534885b6d2a9786a73;hp=64a1fa237ee016c1e02a5df31858321a4ae91e05;hpb=58a2cbef4aac9ee7d530dfb690c78d6fc11a2371;p=oota-llvm.git

diff --git a/lib/Support/Process.cpp b/lib/Support/Process.cpp
index 64a1fa237ee..2c0d37bb329 100644
--- a/lib/Support/Process.cpp
+++ b/lib/Support/Process.cpp
@@ -50,6 +50,31 @@ self_process::~self_process() {
   llvm_unreachable("This destructor must never be executed!");
 }
 
+/// \brief A helper function to compute the elapsed wall-time since the program
+/// started.
+///
+/// Note that this routine actually computes the elapsed wall time since the
+/// first time it was called. However, we arrange to have it called during the
+/// startup of the process to get approximately correct results.
+static TimeValue getElapsedWallTime() {
+  static TimeValue &StartTime = *new TimeValue(TimeValue::now());
+  return TimeValue::now() - StartTime;
+}
+
+/// \brief A special global variable to ensure we call \c getElapsedWallTime
+/// during global initialization of the program.
+///
+/// Note that this variable is never referenced elsewhere. Doing so could
+/// create race conditions during program startup or shutdown.
+static volatile TimeValue DummyTimeValue = getElapsedWallTime();
+
+// Implement this routine by using the static helpers above. They're already
+// portable.
+TimeValue self_process::get_wall_time() const {
+  return getElapsedWallTime();
+}
+
+
 #if defined(_MSC_VER)
 #pragma warning(pop)
 #endif