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Unified Diff: util/misc/clock_win.cc

Issue 807973002: win: clock implementation (Closed) Base URL: https://chromium.googlesource.com/crashpad/crashpad@master
Patch Set: . Created 6 years ago
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Index: util/misc/clock_win.cc
diff --git a/util/misc/clock_win.cc b/util/misc/clock_win.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b746c468145b7c3b62ea7a8e4bf842db2066ae5a
--- /dev/null
+++ b/util/misc/clock_win.cc
@@ -0,0 +1,56 @@
+// 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);
+}
+
+void SleepNanoseconds(uint64_t nanoseconds) {
+ // This is both inaccurate (will be way too long for short sleeps) and
+ // incorrect (can sleep for less than requested). But it's what's available
+ // without implementing a busy loop.
Mark Mentovai 2014/12/17 01:12:23 Probably should do the loop until ClockMonotonicNa
scottmg 2014/12/17 01:58:11 Done. I look forward to deleting it!
+ const uint64_t kNanosecondsPerMillisecond = static_cast<const uint64_t>(1E6);
+ Sleep(static_cast<DWORD>(nanoseconds / kNanosecondsPerMillisecond));
+}
+
+} // namespace crashpad
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