From db6492e15405e5bfa4fc99097dd866544b19a0ee Mon Sep 17 00:00:00 2001
From: Scott Graham <scottmg@chromium.org>
Date: Wed, 17 Dec 2014 10:45:43 -0800
Subject: [PATCH] win: clock implementation

R=mark@chromium.org
BUG=crashpad:1

Review URL: https://codereview.chromium.org/807973002
---
 util/misc/clock.h                      |  6 ++++
 util/misc/{clock.cc => clock_posix.cc} |  0
 util/misc/clock_win.cc                 | 48 ++++++++++++++++++++++++++
 util/util.gyp                          |  3 +-
 4 files changed, 56 insertions(+), 1 deletion(-)
 rename util/misc/{clock.cc => clock_posix.cc} (100%)
 create mode 100644 util/misc/clock_win.cc

diff --git a/util/misc/clock.h b/util/misc/clock.h
index 88bdcd50..a07e12a6 100644
--- a/util/misc/clock.h
+++ b/util/misc/clock.h
@@ -17,6 +17,8 @@
 
 #include <stdint.h>
 
+#include "build/build_config.h"
+
 namespace crashpad {
 
 //! \brief Returns the value of the system’s monotonic clock.
@@ -32,6 +34,8 @@ namespace crashpad {
 //! \return The value of the system’s monotonic clock, in nanoseconds.
 uint64_t ClockMonotonicNanoseconds();
 
+#if !defined(OS_WIN)  // Not implemented on Windows yet.
+
 //! \brief Sleeps for the specified duration.
 //!
 //! \param[in] nanoseconds The number of nanoseconds to sleep. The actual sleep
@@ -41,6 +45,8 @@ uint64_t ClockMonotonicNanoseconds();
 //! being interrupted by a signal.
 void SleepNanoseconds(uint64_t nanoseconds);
 
+#endif
+
 }  // namespace crashpad
 
 #endif  // CRASHPAD_UTIL_MISC_CLOCK_H_
diff --git a/util/misc/clock.cc b/util/misc/clock_posix.cc
similarity index 100%
rename from util/misc/clock.cc
rename to util/misc/clock_posix.cc
diff --git a/util/misc/clock_win.cc b/util/misc/clock_win.cc
new file mode 100644
index 00000000..731e98d4
--- /dev/null
+++ b/util/misc/clock_win.cc
@@ -0,0 +1,48 @@
+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// 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.
+
+#include "util/misc/clock.h"
+
+#include <sys/types.h>
+#include <windows.h>
+
+namespace {
+
+LARGE_INTEGER QpcFrequencyInternal() {
+  LARGE_INTEGER frequency;
+  QueryPerformanceFrequency(&frequency);
+  return frequency;
+}
+
+int64_t QpcFrequency() {
+  static LARGE_INTEGER frequency = QpcFrequencyInternal();
+  return frequency.QuadPart;
+}
+
+}  // namespace
+
+namespace crashpad {
+
+uint64_t ClockMonotonicNanoseconds() {
+  LARGE_INTEGER time;
+  QueryPerformanceCounter(&time);
+  int64_t frequency = QpcFrequency();
+  int64_t whole_seconds = time.QuadPart / frequency;
+  int64_t leftover_ticks = time.QuadPart / (whole_seconds * frequency);
+  const int64_t kNanosecondsPerSecond = static_cast<const int64_t>(1E9);
+  return (whole_seconds * kNanosecondsPerSecond) +
+         ((leftover_ticks * kNanosecondsPerSecond) / frequency);
+}
+
+}  // namespace crashpad
diff --git a/util/util.gyp b/util/util.gyp
index 2882b046..6ec762f3 100644
--- a/util/util.gyp
+++ b/util/util.gyp
@@ -72,9 +72,10 @@
         'mach/task_for_pid.h',
         'mach/task_memory.cc',
         'mach/task_memory.h',
-        'misc/clock.cc',
         'misc/clock.h',
         'misc/clock_mac.cc',
+        'misc/clock_posix.cc',
+        'misc/clock_win.cc',
         'misc/initialization_state.h',
         'misc/initialization_state_dcheck.cc',
         'misc/initialization_state_dcheck.h',