1 files changed, 93 insertions, 0 deletions
diff --git a/mozglue/misc/AwakeTimeStamp.cpp b/mozglue/misc/AwakeTimeStamp.cpp
new file mode 100644
index 0000000000..a5c8ed4abd
--- /dev/null
+++ b/mozglue/misc/AwakeTimeStamp.cpp
@@ -0,0 +1,93 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "AwakeTimeStamp.h"
+
+#ifdef XP_WIN
+#  include <windows.h>
+#endif
+
+#include "mozilla/Assertions.h"
+#include "mozilla/DebugOnly.h"
+
+namespace mozilla {
+
+static constexpr uint64_t kUSperS = 1000000;
+static constexpr uint64_t kUSperMS = 1000;
+#ifndef XP_WIN
+static constexpr uint64_t kNSperUS = 1000;
+#endif
+
+double AwakeTimeDuration::ToSeconds() const {
+  return static_cast<double>(mValueUs) / kUSperS;
+}
+double AwakeTimeDuration::ToMilliseconds() const {
+  return static_cast<double>(mValueUs) / kUSperMS;
+}
+double AwakeTimeDuration::ToMicroseconds() const {
+  return static_cast<double>(mValueUs);
+}
+
+AwakeTimeDuration AwakeTimeStamp::operator-(
+    AwakeTimeStamp const& aOther) const {
+  return AwakeTimeDuration(mValueUs - aOther.mValueUs);
+}
+
+AwakeTimeStamp AwakeTimeStamp::operator+(
+    const AwakeTimeDuration& aDuration) const {
+  return AwakeTimeStamp(mValueUs + aDuration.mValueUs);
+}
+
+void AwakeTimeStamp::operator+=(const AwakeTimeDuration& aOther) {
+  mValueUs += aOther.mValueUs;
+}
+
+void AwakeTimeStamp::operator-=(const AwakeTimeDuration& aOther) {
+  MOZ_ASSERT(mValueUs >= aOther.mValueUs);
+  mValueUs -= aOther.mValueUs;
+}
+
+// Apple things
+#if defined(__APPLE__) && defined(__MACH__)
+#  include <time.h>
+#  include <sys/time.h>
+#  include <sys/types.h>
+#  include <mach/mach_time.h>
+
+AwakeTimeStamp AwakeTimeStamp::NowLoRes() {
+  return AwakeTimeStamp(clock_gettime_nsec_np(CLOCK_UPTIME_RAW) / kNSperUS);
+}
+
+#elif defined(XP_WIN)
+
+// Number of hundreds of nanoseconds in a microsecond
+static constexpr uint64_t kHNSperUS = 10;
+
+AwakeTimeStamp AwakeTimeStamp::NowLoRes() {
+  ULONGLONG interrupt_time;
+  DebugOnly<bool> rv = QueryUnbiasedInterruptTime(&interrupt_time);
+  MOZ_ASSERT(rv);
+
+  return AwakeTimeStamp(interrupt_time / kHNSperUS);
+}
+
+#else  // Linux and other POSIX but not macOS
+#  include <time.h>
+
+uint64_t TimespecToMicroseconds(struct timespec aTs) {
+  return aTs.tv_sec * kUSperS + aTs.tv_nsec / kNSperUS;
+}
+
+AwakeTimeStamp AwakeTimeStamp::NowLoRes() {
+  struct timespec ts = {0};
+  DebugOnly<int> rv = clock_gettime(CLOCK_MONOTONIC, &ts);
+  MOZ_ASSERT(!rv);
+  return AwakeTimeStamp(TimespecToMicroseconds(ts));
+}
+
+#endif
+
+};  // namespace mozilla