1 files changed, 83 insertions, 0 deletions
diff --git a/grapher/Time.hxx b/grapher/Time.hxx
new file mode 100644
index 00000000..7e16b7b2
--- /dev/null
+++ b/grapher/Time.hxx
@@ -0,0 +1,83 @@
+// systemtap grapher
+// Copyright (C) 2009 Red Hat Inc.
+//
+// This file is part of systemtap, and is free software.  You can
+// redistribute it and/or modify it under the terms of the GNU General
+// Public License (GPL); either version 2, or (at your option) any
+// later version.
+
+#ifndef SYSTEMTAP_GRAPHER_TIME_HXX
+#define SYSTEMTAP_GRAPHER_TIME_HXX 1
+
+#include <stdint.h>
+#include <sys/time.h>
+
+namespace systemtap
+{
+
+template<typename T>
+class Singleton
+{
+public:
+  static T& instance()
+  {
+    static T _instance;
+    return _instance;
+  }
+protected:
+  Singleton() {}
+private:
+  // Insure that singleton is constructed before main() is called.
+  struct InstanceBuilder
+  {
+    InstanceBuilder()
+    {
+      instance();
+    }
+  };
+  static InstanceBuilder _instanceBuilder;
+};
+
+template<typename T>
+typename Singleton<T>::InstanceBuilder Singleton<T>::_instanceBuilder;
+
+class Time : public Singleton<Time>
+{
+public:
+  Time()
+    : origin(0)
+  {
+    origin = getTime();
+  }
+
+  int64_t getTime()
+  {
+    timeval tval;
+    gettimeofday(&tval, 0);
+    int64_t now = toUs(tval);
+    return now - origin;
+  }
+
+  static int64_t get()
+  {
+    return instance().getTime();
+  }
+
+  static int64_t getAbs()
+  {
+    timeval tval;
+    gettimeofday(&tval, 0);
+    return toUs(tval);
+  }
+
+  static int64_t toUs(const timeval& t)
+  {
+    int64_t result = t.tv_sec * 1000000;
+    result += t.tv_usec;
+    return result;
+  }
+
+  int64_t origin;
+};
+}
+#endif