time: use std::chrono for nanoseconds query

time.cpp

@@ -11,24 +11,37 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
- * Copyright 2010 Danny Robson <danny@nerdcruft.net>
+ * Copyright 2010-2016 Danny Robson <danny@nerdcruft.net>
  */
 
-#include "time.hpp"
+#include "./time.hpp"
 
-#include "debug.hpp"
+#include "./debug.hpp"
-#include "log.hpp"
+#include "./log.hpp"
-#include "platform.hpp"
+#include "./platform.hpp"
-#include "cast.hpp"
+#include "./cast.hpp"
 
+#include <chrono>
 
-using namespace util;
+using util::delta_clock;
 
 ///////////////////////////////////////////////////////////////////////////////
 static const uint64_t SECOND      = 1'000'000'000UL;
 static const uint64_t MILLISECOND =     1'000'000UL;
 
 
+///////////////////////////////////////////////////////////////////////////////
+uintmax_t
+util::nanoseconds (void)
+{
+    return std::chrono::duration_cast<
+        std::chrono::duration<uintmax_t, std::nano>
+    > (
+        std::chrono::high_resolution_clock::now ().time_since_epoch ()
+    ).count ();
+}
+
+
 ///////////////////////////////////////////////////////////////////////////////
 delta_clock::delta_clock ():
     time { util::nanoseconds (), util::nanoseconds () }

time.hpp

@@ -11,21 +11,26 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
- * Copyright 2010 Danny Robson <danny@nerdcruft.net>
+ * Copyright 2010-2016 Danny Robson <danny@nerdcruft.net>
  */
 
 #ifndef __UTIL_TIME_HPP
 #define __UTIL_TIME_HPP
 
+#include <chrono>
 #include <cstdint>
 #include <string>
 
-#include "stats.hpp"
+#include "./stats.hpp"
 
 namespace util {
     // ------------------------------------------------------------------------
-    uint64_t nanoseconds (void);
+    uintmax_t nanoseconds (void);
-    void     sleep (uint64_t ns);
+
+    template <typename T>
+    void sleep (std::chrono::duration<T,std::nano>);
+
+    void sleep (uint64_t ns);
 
     // ------------------------------------------------------------------------
     class delta_clock {
@@ -84,4 +89,6 @@ namespace util {
     };
 }
 
+#include "./time.ipp"
+
 #endif // __UTIL_TIME_HPP

time.ipp

@@ -0,0 +1,28 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright 2016 Danny Robson <danny@nerdcruft.net>
+ */
+
+#ifndef __UTIL_TIME_IPP
+#define __UTIL_TIME_IPP
+
+template <typename T>
+void
+util::sleep (std::chrono::duration<T,std::nano> dt)
+{
+    auto nano = std::chrono::duration_cast<std::chrono::nanoseconds> (dt);
+    sleep (nano.count ());
+}
+
+#endif

time_posix.cpp

@@ -11,31 +11,16 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
- * Copyright 2010 Danny Robson <danny@nerdcruft.net>
+ * Copyright 2010-2016 Danny Robson <danny@nerdcruft.net>
  */
 
-#include "time.hpp"
+#include "./time.hpp"
 
-#include "cast.hpp"
+#include "./cast.hpp"
 
 #include <ctime>
 
-static const uint64_t SECOND      = 1'000'000'000UL;
+static constexpr uint64_t SECOND = 1'000'000'000UL;
-static const uint64_t MILLISECOND =     1'000'000UL;
-
-///////////////////////////////////////////////////////////////////////////////
-uint64_t
-util::nanoseconds (void)
-{
-    struct timespec t;
-    clock_gettime (CLOCK_MONOTONIC, &t);
-
-    CHECK_GT (t.tv_sec, 0);
-    CHECK_GT (t.tv_nsec, 0);
-
-    return static_cast<uint64_t> (t.tv_sec) * SECOND + static_cast<uint64_t> (t.tv_nsec);
-}
-
 
 ///////////////////////////////////////////////////////////////////////////////
 void

time_win32.cpp

@@ -11,37 +11,16 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
- * Copyright 2010 Danny Robson <danny@nerdcruft.net>
+ * Copyright 2010-2016 Danny Robson <danny@nerdcruft.net>
  */
 
 #include "time.hpp"
 
-#include "platform.hpp"
-
-#if !defined(PLATFORM_WIN32)
-#error
-#endif
-
 #include <windows.h>
 
-static const uint64_t SECOND      = 1'000'000'000UL;
-static const uint64_t MILLISECOND =     1'000'000UL;
-
-///////////////////////////////////////////////////////////////////////////////
-uint64_t
-util::nanoseconds (void)
-{
-    LARGE_INTEGER freq, count;
-    QueryPerformanceFrequency (&freq);
-    QueryPerformanceCounter   (&count);
-
-    return count.QuadPart * SECOND / freq.QuadPart;
-}
-
-
 ///////////////////////////////////////////////////////////////////////////////
 void
 util::sleep (uint64_t ns)
 {
-    Sleep (ns / MILLISECOND);
+    Sleep (ns / 1'000'000UL);
 }