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--HG-- rename : security/sandbox/base/at_exit.cc => security/sandbox/chromium/base/at_exit.cc rename : security/sandbox/base/at_exit.h => security/sandbox/chromium/base/at_exit.h rename : security/sandbox/base/atomic_ref_count.h => security/sandbox/chromium/base/atomic_ref_count.h rename : security/sandbox/base/atomic_sequence_num.h => security/sandbox/chromium/base/atomic_sequence_num.h rename : security/sandbox/base/atomicops.h => security/sandbox/chromium/base/atomicops.h rename : security/sandbox/base/atomicops_internals_tsan.h => security/sandbox/chromium/base/atomicops_internals_tsan.h rename : security/sandbox/base/atomicops_internals_x86_gcc.h => security/sandbox/chromium/base/atomicops_internals_x86_gcc.h rename : security/sandbox/base/atomicops_internals_x86_msvc.h => security/sandbox/chromium/base/atomicops_internals_x86_msvc.h rename : security/sandbox/base/base_export.h => security/sandbox/chromium/base/base_export.h rename : security/sandbox/base/base_paths.cc => security/sandbox/chromium/base/base_paths.cc rename : security/sandbox/base/base_paths.h => security/sandbox/chromium/base/base_paths.h rename : security/sandbox/base/base_paths_win.cc => security/sandbox/chromium/base/base_paths_win.cc rename : security/sandbox/base/base_paths_win.h => security/sandbox/chromium/base/base_paths_win.h rename : security/sandbox/base/base_switches.cc => security/sandbox/chromium/base/base_switches.cc rename : security/sandbox/base/base_switches.h => security/sandbox/chromium/base/base_switches.h rename : security/sandbox/base/basictypes.h => security/sandbox/chromium/base/basictypes.h rename : security/sandbox/base/bind.h => security/sandbox/chromium/base/bind.h rename : security/sandbox/base/bind_helpers.h => security/sandbox/chromium/base/bind_helpers.h rename : security/sandbox/base/bind_internal.h => security/sandbox/chromium/base/bind_internal.h rename : security/sandbox/base/bind_internal_win.h => security/sandbox/chromium/base/bind_internal_win.h rename : security/sandbox/base/callback.h => security/sandbox/chromium/base/callback.h rename : security/sandbox/base/callback_forward.h => security/sandbox/chromium/base/callback_forward.h rename : security/sandbox/base/callback_internal.cc => security/sandbox/chromium/base/callback_internal.cc rename : security/sandbox/base/callback_internal.h => security/sandbox/chromium/base/callback_internal.h rename : security/sandbox/base/command_line.cc => security/sandbox/chromium/base/command_line.cc rename : security/sandbox/base/command_line.h => security/sandbox/chromium/base/command_line.h rename : security/sandbox/base/compiler_specific.h => security/sandbox/chromium/base/compiler_specific.h rename : security/sandbox/base/containers/hash_tables.h => security/sandbox/chromium/base/containers/hash_tables.h rename : security/sandbox/base/cpu.cc => security/sandbox/chromium/base/cpu.cc rename : security/sandbox/base/cpu.h => security/sandbox/chromium/base/cpu.h rename : security/sandbox/base/critical_closure.h => security/sandbox/chromium/base/critical_closure.h rename : security/sandbox/base/debug/alias.cc => security/sandbox/chromium/base/debug/alias.cc rename : security/sandbox/base/debug/alias.h => security/sandbox/chromium/base/debug/alias.h rename : security/sandbox/base/debug/debugger.h => security/sandbox/chromium/base/debug/debugger.h rename : security/sandbox/base/debug/leak_annotations.h => security/sandbox/chromium/base/debug/leak_annotations.h rename : security/sandbox/base/debug/profiler.cc => security/sandbox/chromium/base/debug/profiler.cc rename : security/sandbox/base/debug/profiler.h => security/sandbox/chromium/base/debug/profiler.h rename : security/sandbox/base/environment.h => security/sandbox/chromium/base/environment.h rename : security/sandbox/base/file_descriptor_posix.h => security/sandbox/chromium/base/file_descriptor_posix.h rename : security/sandbox/base/file_util.cc => security/sandbox/chromium/base/file_util.cc rename : security/sandbox/base/file_util.h => security/sandbox/chromium/base/file_util.h rename : security/sandbox/base/file_util_win.cc => security/sandbox/chromium/base/file_util_win.cc rename : security/sandbox/base/file_version_info.h => security/sandbox/chromium/base/file_version_info.h rename : security/sandbox/base/file_version_info_win.h => security/sandbox/chromium/base/file_version_info_win.h rename : security/sandbox/base/files/file_path.h => security/sandbox/chromium/base/files/file_path.h rename : security/sandbox/base/float_util.h => security/sandbox/chromium/base/float_util.h rename : security/sandbox/base/format_macros.h => security/sandbox/chromium/base/format_macros.h rename : security/sandbox/base/guid.h => security/sandbox/chromium/base/guid.h rename : security/sandbox/base/lazy_instance.cc => security/sandbox/chromium/base/lazy_instance.cc rename : security/sandbox/base/lazy_instance.h => security/sandbox/chromium/base/lazy_instance.h rename : security/sandbox/base/location.cc => security/sandbox/chromium/base/location.cc rename : security/sandbox/base/location.h => security/sandbox/chromium/base/location.h rename : security/sandbox/base/logging.cc => security/sandbox/chromium/base/logging.cc rename : security/sandbox/base/logging.h => security/sandbox/chromium/base/logging.h rename : security/sandbox/base/logging_win.cc => security/sandbox/chromium/base/logging_win.cc rename : security/sandbox/base/logging_win.h => security/sandbox/chromium/base/logging_win.h rename : security/sandbox/base/memory/aligned_memory.h => security/sandbox/chromium/base/memory/aligned_memory.h rename : security/sandbox/base/memory/raw_scoped_refptr_mismatch_checker.h => security/sandbox/chromium/base/memory/raw_scoped_refptr_mismatch_checker.h rename : security/sandbox/base/memory/ref_counted.cc => security/sandbox/chromium/base/memory/ref_counted.cc rename : security/sandbox/base/memory/ref_counted.h => security/sandbox/chromium/base/memory/ref_counted.h rename : security/sandbox/base/memory/scoped_ptr.h => security/sandbox/chromium/base/memory/scoped_ptr.h rename : security/sandbox/base/memory/singleton.cc => security/sandbox/chromium/base/memory/singleton.cc rename : security/sandbox/base/memory/singleton.h => security/sandbox/chromium/base/memory/singleton.h rename : security/sandbox/base/memory/weak_ptr.h => security/sandbox/chromium/base/memory/weak_ptr.h rename : security/sandbox/base/move.h => security/sandbox/chromium/base/move.h rename : security/sandbox/base/observer_list.h => security/sandbox/chromium/base/observer_list.h rename : security/sandbox/base/observer_list_threadsafe.h => security/sandbox/chromium/base/observer_list_threadsafe.h rename : security/sandbox/base/os_compat_nacl.h => security/sandbox/chromium/base/os_compat_nacl.h rename : security/sandbox/base/path_service.cc => security/sandbox/chromium/base/path_service.cc rename : security/sandbox/base/path_service.h => security/sandbox/chromium/base/path_service.h rename : security/sandbox/base/pending_task.h => security/sandbox/chromium/base/pending_task.h rename : security/sandbox/base/platform_file.cc => security/sandbox/chromium/base/platform_file.cc rename : security/sandbox/base/platform_file.h => security/sandbox/chromium/base/platform_file.h rename : security/sandbox/base/port.h => security/sandbox/chromium/base/port.h rename : security/sandbox/base/process/process_handle.h => security/sandbox/chromium/base/process/process_handle.h rename : security/sandbox/base/profiler/alternate_timer.h => security/sandbox/chromium/base/profiler/alternate_timer.h rename : security/sandbox/base/profiler/tracked_time.h => security/sandbox/chromium/base/profiler/tracked_time.h rename : security/sandbox/base/rand_util.h => security/sandbox/chromium/base/rand_util.h rename : security/sandbox/base/run_loop.h => security/sandbox/chromium/base/run_loop.h rename : security/sandbox/base/scoped_clear_errno.h => security/sandbox/chromium/base/scoped_clear_errno.h rename : security/sandbox/base/sequence_checker.h => security/sandbox/chromium/base/sequence_checker.h rename : security/sandbox/base/sequence_checker_impl.h => security/sandbox/chromium/base/sequence_checker_impl.h rename : security/sandbox/base/sequenced_task_runner.h => security/sandbox/chromium/base/sequenced_task_runner.h rename : security/sandbox/base/sequenced_task_runner_helpers.h => security/sandbox/chromium/base/sequenced_task_runner_helpers.h rename : security/sandbox/base/shim/base/gtest_prod_util.h => security/sandbox/chromium/base/shim/base/gtest_prod_util.h rename : security/sandbox/base/shim/base/logging.cpp => security/sandbox/chromium/base/shim/base/logging.cpp rename : security/sandbox/base/shim/base/strings/string_piece.h => security/sandbox/chromium/base/shim/base/strings/string_piece.h rename : security/sandbox/base/shim/base/third_party/nspr/prtime.h => security/sandbox/chromium/base/shim/base/third_party/nspr/prtime.h rename : security/sandbox/base/shim/base/third_party/nspr/prtypes.h => security/sandbox/chromium/base/shim/base/third_party/nspr/prtypes.h rename : security/sandbox/base/shim/base/tracked_objects.h => security/sandbox/chromium/base/shim/base/tracked_objects.h rename : security/sandbox/base/shim/sdkdecls.h => security/sandbox/chromium/base/shim/sdkdecls.h rename : security/sandbox/base/single_thread_task_runner.h => security/sandbox/chromium/base/single_thread_task_runner.h rename : security/sandbox/base/stl_util.h => security/sandbox/chromium/base/stl_util.h rename : security/sandbox/base/strings/nullable_string16.cc => security/sandbox/chromium/base/strings/nullable_string16.cc rename : security/sandbox/base/strings/nullable_string16.h => security/sandbox/chromium/base/strings/nullable_string16.h rename : security/sandbox/base/strings/string16.h => security/sandbox/chromium/base/strings/string16.h rename : security/sandbox/base/strings/string_number_conversions.cc => security/sandbox/chromium/base/strings/string_number_conversions.cc rename : security/sandbox/base/strings/string_number_conversions.h => security/sandbox/chromium/base/strings/string_number_conversions.h rename : security/sandbox/base/strings/string_piece.cc => security/sandbox/chromium/base/strings/string_piece.cc rename : security/sandbox/base/strings/string_piece.h => security/sandbox/chromium/base/strings/string_piece.h rename : security/sandbox/base/strings/string_util.h => security/sandbox/chromium/base/strings/string_util.h rename : security/sandbox/base/strings/string_util_constants.cc => security/sandbox/chromium/base/strings/string_util_constants.cc rename : security/sandbox/base/strings/string_util_stripped.cc => security/sandbox/chromium/base/strings/string_util_stripped.cc rename : security/sandbox/base/strings/string_util_win.h => security/sandbox/chromium/base/strings/string_util_win.h rename : security/sandbox/base/strings/stringprintf.cc => security/sandbox/chromium/base/strings/stringprintf.cc rename : security/sandbox/base/strings/stringprintf.h => security/sandbox/chromium/base/strings/stringprintf.h rename : security/sandbox/base/strings/utf_string_conversion_utils.cc => security/sandbox/chromium/base/strings/utf_string_conversion_utils.cc rename : security/sandbox/base/strings/utf_string_conversion_utils.h => security/sandbox/chromium/base/strings/utf_string_conversion_utils.h rename : security/sandbox/base/strings/utf_string_conversions.cc => security/sandbox/chromium/base/strings/utf_string_conversions.cc rename : security/sandbox/base/strings/utf_string_conversions.h => security/sandbox/chromium/base/strings/utf_string_conversions.h rename : security/sandbox/base/synchronization/lock.cc => security/sandbox/chromium/base/synchronization/lock.cc rename : security/sandbox/base/synchronization/lock.h => security/sandbox/chromium/base/synchronization/lock.h rename : security/sandbox/base/synchronization/lock_impl.h => security/sandbox/chromium/base/synchronization/lock_impl.h rename : security/sandbox/base/synchronization/lock_impl_win.cc => security/sandbox/chromium/base/synchronization/lock_impl_win.cc rename : security/sandbox/base/sys_info.h => security/sandbox/chromium/base/sys_info.h rename : security/sandbox/base/task_runner.h => security/sandbox/chromium/base/task_runner.h rename : security/sandbox/base/template_util.h => security/sandbox/chromium/base/template_util.h rename : security/sandbox/base/third_party/dmg_fp/LICENSE => security/sandbox/chromium/base/third_party/dmg_fp/LICENSE rename : security/sandbox/base/third_party/dmg_fp/dmg_fp.h => security/sandbox/chromium/base/third_party/dmg_fp/dmg_fp.h rename : security/sandbox/base/third_party/dmg_fp/dtoa.cc => security/sandbox/chromium/base/third_party/dmg_fp/dtoa.cc rename : security/sandbox/base/third_party/dmg_fp/g_fmt.cc => security/sandbox/chromium/base/third_party/dmg_fp/g_fmt.cc rename : security/sandbox/base/third_party/dynamic_annotations/LICENSE => security/sandbox/chromium/base/third_party/dynamic_annotations/LICENSE rename : security/sandbox/base/third_party/dynamic_annotations/dynamic_annotations.h => security/sandbox/chromium/base/third_party/dynamic_annotations/dynamic_annotations.h rename : security/sandbox/base/third_party/icu/LICENSE => security/sandbox/chromium/base/third_party/icu/LICENSE rename : security/sandbox/base/third_party/icu/icu_utf.cc => security/sandbox/chromium/base/third_party/icu/icu_utf.cc rename : security/sandbox/base/third_party/icu/icu_utf.h => security/sandbox/chromium/base/third_party/icu/icu_utf.h rename : security/sandbox/base/thread_task_runner_handle.h => security/sandbox/chromium/base/thread_task_runner_handle.h rename : security/sandbox/base/threading/platform_thread.h => security/sandbox/chromium/base/threading/platform_thread.h rename : security/sandbox/base/threading/platform_thread_win.cc => security/sandbox/chromium/base/threading/platform_thread_win.cc rename : security/sandbox/base/threading/sequenced_worker_pool.h => security/sandbox/chromium/base/threading/sequenced_worker_pool.h rename : security/sandbox/base/threading/thread_checker_impl.h => security/sandbox/chromium/base/threading/thread_checker_impl.h rename : security/sandbox/base/threading/thread_collision_warner.cc => security/sandbox/chromium/base/threading/thread_collision_warner.cc rename : security/sandbox/base/threading/thread_collision_warner.h => security/sandbox/chromium/base/threading/thread_collision_warner.h rename : security/sandbox/base/threading/thread_id_name_manager.cc => security/sandbox/chromium/base/threading/thread_id_name_manager.cc rename : security/sandbox/base/threading/thread_id_name_manager.h => security/sandbox/chromium/base/threading/thread_id_name_manager.h rename : security/sandbox/base/threading/thread_local.h => security/sandbox/chromium/base/threading/thread_local.h rename : security/sandbox/base/threading/thread_local_storage.h => security/sandbox/chromium/base/threading/thread_local_storage.h rename : security/sandbox/base/threading/thread_local_win.cc => security/sandbox/chromium/base/threading/thread_local_win.cc rename : security/sandbox/base/threading/thread_restrictions.cc => security/sandbox/chromium/base/threading/thread_restrictions.cc rename : security/sandbox/base/threading/thread_restrictions.h => security/sandbox/chromium/base/threading/thread_restrictions.h rename : security/sandbox/base/time/time.cc => security/sandbox/chromium/base/time/time.cc rename : security/sandbox/base/time/time.h => security/sandbox/chromium/base/time/time.h rename : security/sandbox/base/time/time_win.cc => security/sandbox/chromium/base/time/time_win.cc rename : security/sandbox/base/tracking_info.h => security/sandbox/chromium/base/tracking_info.h rename : security/sandbox/base/tuple.h => security/sandbox/chromium/base/tuple.h rename : security/sandbox/base/values.h => security/sandbox/chromium/base/values.h rename : security/sandbox/base/version.h => security/sandbox/chromium/base/version.h rename : security/sandbox/base/win/event_trace_provider.cc => security/sandbox/chromium/base/win/event_trace_provider.cc rename : security/sandbox/base/win/event_trace_provider.h => security/sandbox/chromium/base/win/event_trace_provider.h rename : security/sandbox/base/win/pe_image.cc => security/sandbox/chromium/base/win/pe_image.cc rename : security/sandbox/base/win/pe_image.h => security/sandbox/chromium/base/win/pe_image.h rename : security/sandbox/base/win/registry.cc => security/sandbox/chromium/base/win/registry.cc rename : security/sandbox/base/win/registry.h => security/sandbox/chromium/base/win/registry.h rename : security/sandbox/base/win/scoped_handle.cc => security/sandbox/chromium/base/win/scoped_handle.cc rename : security/sandbox/base/win/scoped_handle.h => security/sandbox/chromium/base/win/scoped_handle.h rename : security/sandbox/base/win/scoped_process_information.cc => security/sandbox/chromium/base/win/scoped_process_information.cc rename : security/sandbox/base/win/scoped_process_information.h => security/sandbox/chromium/base/win/scoped_process_information.h rename : security/sandbox/base/win/startup_information.cc => security/sandbox/chromium/base/win/startup_information.cc rename : security/sandbox/base/win/startup_information.h => security/sandbox/chromium/base/win/startup_information.h rename : security/sandbox/base/win/windows_version.cc => security/sandbox/chromium/base/win/windows_version.cc rename : security/sandbox/base/win/windows_version.h => security/sandbox/chromium/base/win/windows_version.h
533 lines
17 KiB
C++
533 lines
17 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Windows Timer Primer
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//
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// A good article: http://www.ddj.com/windows/184416651
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// A good mozilla bug: http://bugzilla.mozilla.org/show_bug.cgi?id=363258
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//
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// The default windows timer, GetSystemTimeAsFileTime is not very precise.
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// It is only good to ~15.5ms.
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//
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// QueryPerformanceCounter is the logical choice for a high-precision timer.
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// However, it is known to be buggy on some hardware. Specifically, it can
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// sometimes "jump". On laptops, QPC can also be very expensive to call.
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// It's 3-4x slower than timeGetTime() on desktops, but can be 10x slower
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// on laptops. A unittest exists which will show the relative cost of various
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// timers on any system.
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//
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// The next logical choice is timeGetTime(). timeGetTime has a precision of
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// 1ms, but only if you call APIs (timeBeginPeriod()) which affect all other
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// applications on the system. By default, precision is only 15.5ms.
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// Unfortunately, we don't want to call timeBeginPeriod because we don't
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// want to affect other applications. Further, on mobile platforms, use of
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// faster multimedia timers can hurt battery life. See the intel
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// article about this here:
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// http://softwarecommunity.intel.com/articles/eng/1086.htm
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//
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// To work around all this, we're going to generally use timeGetTime(). We
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// will only increase the system-wide timer if we're not running on battery
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// power. Using timeBeginPeriod(1) is a requirement in order to make our
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// message loop waits have the same resolution that our time measurements
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// do. Otherwise, WaitForSingleObject(..., 1) will no less than 15ms when
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// there is nothing else to waken the Wait.
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#include "base/time/time.h"
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#pragma comment(lib, "winmm.lib")
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#include <windows.h>
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#include <mmsystem.h>
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#include "base/basictypes.h"
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#include "base/cpu.h"
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#include "base/logging.h"
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#include "base/memory/singleton.h"
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#include "base/synchronization/lock.h"
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using base::Time;
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using base::TimeDelta;
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using base::TimeTicks;
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namespace {
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// From MSDN, FILETIME "Contains a 64-bit value representing the number of
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// 100-nanosecond intervals since January 1, 1601 (UTC)."
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int64 FileTimeToMicroseconds(const FILETIME& ft) {
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// Need to bit_cast to fix alignment, then divide by 10 to convert
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// 100-nanoseconds to milliseconds. This only works on little-endian
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// machines.
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return bit_cast<int64, FILETIME>(ft) / 10;
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}
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void MicrosecondsToFileTime(int64 us, FILETIME* ft) {
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DCHECK_GE(us, 0LL) << "Time is less than 0, negative values are not "
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"representable in FILETIME";
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// Multiply by 10 to convert milliseconds to 100-nanoseconds. Bit_cast will
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// handle alignment problems. This only works on little-endian machines.
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*ft = bit_cast<FILETIME, int64>(us * 10);
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}
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int64 CurrentWallclockMicroseconds() {
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FILETIME ft;
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::GetSystemTimeAsFileTime(&ft);
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return FileTimeToMicroseconds(ft);
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}
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// Time between resampling the un-granular clock for this API. 60 seconds.
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const int kMaxMillisecondsToAvoidDrift = 60 * Time::kMillisecondsPerSecond;
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int64 initial_time = 0;
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TimeTicks initial_ticks;
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void InitializeClock() {
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initial_ticks = TimeTicks::Now();
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initial_time = CurrentWallclockMicroseconds();
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}
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} // namespace
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// Time -----------------------------------------------------------------------
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// The internal representation of Time uses FILETIME, whose epoch is 1601-01-01
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// 00:00:00 UTC. ((1970-1601)*365+89)*24*60*60*1000*1000, where 89 is the
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// number of leap year days between 1601 and 1970: (1970-1601)/4 excluding
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// 1700, 1800, and 1900.
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// static
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const int64 Time::kTimeTToMicrosecondsOffset = GG_INT64_C(11644473600000000);
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bool Time::high_resolution_timer_enabled_ = false;
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int Time::high_resolution_timer_activated_ = 0;
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// static
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Time Time::Now() {
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if (initial_time == 0)
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InitializeClock();
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// We implement time using the high-resolution timers so that we can get
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// timeouts which are smaller than 10-15ms. If we just used
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// CurrentWallclockMicroseconds(), we'd have the less-granular timer.
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//
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// To make this work, we initialize the clock (initial_time) and the
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// counter (initial_ctr). To compute the initial time, we can check
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// the number of ticks that have elapsed, and compute the delta.
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//
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// To avoid any drift, we periodically resync the counters to the system
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// clock.
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while (true) {
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TimeTicks ticks = TimeTicks::Now();
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// Calculate the time elapsed since we started our timer
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TimeDelta elapsed = ticks - initial_ticks;
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// Check if enough time has elapsed that we need to resync the clock.
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if (elapsed.InMilliseconds() > kMaxMillisecondsToAvoidDrift) {
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InitializeClock();
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continue;
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}
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return Time(elapsed + Time(initial_time));
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}
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}
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// static
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Time Time::NowFromSystemTime() {
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// Force resync.
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InitializeClock();
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return Time(initial_time);
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}
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// static
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Time Time::FromFileTime(FILETIME ft) {
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if (bit_cast<int64, FILETIME>(ft) == 0)
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return Time();
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if (ft.dwHighDateTime == std::numeric_limits<DWORD>::max() &&
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|
ft.dwLowDateTime == std::numeric_limits<DWORD>::max())
|
|
return Max();
|
|
return Time(FileTimeToMicroseconds(ft));
|
|
}
|
|
|
|
FILETIME Time::ToFileTime() const {
|
|
if (is_null())
|
|
return bit_cast<FILETIME, int64>(0);
|
|
if (is_max()) {
|
|
FILETIME result;
|
|
result.dwHighDateTime = std::numeric_limits<DWORD>::max();
|
|
result.dwLowDateTime = std::numeric_limits<DWORD>::max();
|
|
return result;
|
|
}
|
|
FILETIME utc_ft;
|
|
MicrosecondsToFileTime(us_, &utc_ft);
|
|
return utc_ft;
|
|
}
|
|
|
|
// static
|
|
void Time::EnableHighResolutionTimer(bool enable) {
|
|
// Test for single-threaded access.
|
|
static PlatformThreadId my_thread = PlatformThread::CurrentId();
|
|
DCHECK(PlatformThread::CurrentId() == my_thread);
|
|
|
|
if (high_resolution_timer_enabled_ == enable)
|
|
return;
|
|
|
|
high_resolution_timer_enabled_ = enable;
|
|
}
|
|
|
|
// static
|
|
bool Time::ActivateHighResolutionTimer(bool activating) {
|
|
if (!high_resolution_timer_enabled_ && activating)
|
|
return false;
|
|
|
|
// Using anything other than 1ms makes timers granular
|
|
// to that interval.
|
|
const int kMinTimerIntervalMs = 1;
|
|
MMRESULT result;
|
|
if (activating) {
|
|
result = timeBeginPeriod(kMinTimerIntervalMs);
|
|
high_resolution_timer_activated_++;
|
|
} else {
|
|
result = timeEndPeriod(kMinTimerIntervalMs);
|
|
high_resolution_timer_activated_--;
|
|
}
|
|
return result == TIMERR_NOERROR;
|
|
}
|
|
|
|
// static
|
|
bool Time::IsHighResolutionTimerInUse() {
|
|
// Note: we should track the high_resolution_timer_activated_ value
|
|
// under a lock if we want it to be accurate in a system with multiple
|
|
// message loops. We don't do that - because we don't want to take the
|
|
// expense of a lock for this. We *only* track this value so that unit
|
|
// tests can see if the high resolution timer is on or off.
|
|
return high_resolution_timer_enabled_ &&
|
|
high_resolution_timer_activated_ > 0;
|
|
}
|
|
|
|
// static
|
|
Time Time::FromExploded(bool is_local, const Exploded& exploded) {
|
|
// Create the system struct representing our exploded time. It will either be
|
|
// in local time or UTC.
|
|
SYSTEMTIME st;
|
|
st.wYear = exploded.year;
|
|
st.wMonth = exploded.month;
|
|
st.wDayOfWeek = exploded.day_of_week;
|
|
st.wDay = exploded.day_of_month;
|
|
st.wHour = exploded.hour;
|
|
st.wMinute = exploded.minute;
|
|
st.wSecond = exploded.second;
|
|
st.wMilliseconds = exploded.millisecond;
|
|
|
|
FILETIME ft;
|
|
bool success = true;
|
|
// Ensure that it's in UTC.
|
|
if (is_local) {
|
|
SYSTEMTIME utc_st;
|
|
success = TzSpecificLocalTimeToSystemTime(NULL, &st, &utc_st) &&
|
|
SystemTimeToFileTime(&utc_st, &ft);
|
|
} else {
|
|
success = !!SystemTimeToFileTime(&st, &ft);
|
|
}
|
|
|
|
if (!success) {
|
|
NOTREACHED() << "Unable to convert time";
|
|
return Time(0);
|
|
}
|
|
return Time(FileTimeToMicroseconds(ft));
|
|
}
|
|
|
|
void Time::Explode(bool is_local, Exploded* exploded) const {
|
|
if (us_ < 0LL) {
|
|
// We are not able to convert it to FILETIME.
|
|
ZeroMemory(exploded, sizeof(*exploded));
|
|
return;
|
|
}
|
|
|
|
// FILETIME in UTC.
|
|
FILETIME utc_ft;
|
|
MicrosecondsToFileTime(us_, &utc_ft);
|
|
|
|
// FILETIME in local time if necessary.
|
|
bool success = true;
|
|
// FILETIME in SYSTEMTIME (exploded).
|
|
SYSTEMTIME st;
|
|
if (is_local) {
|
|
SYSTEMTIME utc_st;
|
|
// We don't use FileTimeToLocalFileTime here, since it uses the current
|
|
// settings for the time zone and daylight saving time. Therefore, if it is
|
|
// daylight saving time, it will take daylight saving time into account,
|
|
// even if the time you are converting is in standard time.
|
|
success = FileTimeToSystemTime(&utc_ft, &utc_st) &&
|
|
SystemTimeToTzSpecificLocalTime(NULL, &utc_st, &st);
|
|
} else {
|
|
success = !!FileTimeToSystemTime(&utc_ft, &st);
|
|
}
|
|
|
|
if (!success) {
|
|
NOTREACHED() << "Unable to convert time, don't know why";
|
|
ZeroMemory(exploded, sizeof(*exploded));
|
|
return;
|
|
}
|
|
|
|
exploded->year = st.wYear;
|
|
exploded->month = st.wMonth;
|
|
exploded->day_of_week = st.wDayOfWeek;
|
|
exploded->day_of_month = st.wDay;
|
|
exploded->hour = st.wHour;
|
|
exploded->minute = st.wMinute;
|
|
exploded->second = st.wSecond;
|
|
exploded->millisecond = st.wMilliseconds;
|
|
}
|
|
|
|
// TimeTicks ------------------------------------------------------------------
|
|
namespace {
|
|
|
|
// We define a wrapper to adapt between the __stdcall and __cdecl call of the
|
|
// mock function, and to avoid a static constructor. Assigning an import to a
|
|
// function pointer directly would require setup code to fetch from the IAT.
|
|
DWORD timeGetTimeWrapper() {
|
|
return timeGetTime();
|
|
}
|
|
|
|
DWORD (*tick_function)(void) = &timeGetTimeWrapper;
|
|
|
|
// Accumulation of time lost due to rollover (in milliseconds).
|
|
int64 rollover_ms = 0;
|
|
|
|
// The last timeGetTime value we saw, to detect rollover.
|
|
DWORD last_seen_now = 0;
|
|
|
|
// Lock protecting rollover_ms and last_seen_now.
|
|
// Note: this is a global object, and we usually avoid these. However, the time
|
|
// code is low-level, and we don't want to use Singletons here (it would be too
|
|
// easy to use a Singleton without even knowing it, and that may lead to many
|
|
// gotchas). Its impact on startup time should be negligible due to low-level
|
|
// nature of time code.
|
|
base::Lock rollover_lock;
|
|
|
|
// We use timeGetTime() to implement TimeTicks::Now(). This can be problematic
|
|
// because it returns the number of milliseconds since Windows has started,
|
|
// which will roll over the 32-bit value every ~49 days. We try to track
|
|
// rollover ourselves, which works if TimeTicks::Now() is called at least every
|
|
// 49 days.
|
|
TimeDelta RolloverProtectedNow() {
|
|
base::AutoLock locked(rollover_lock);
|
|
// We should hold the lock while calling tick_function to make sure that
|
|
// we keep last_seen_now stay correctly in sync.
|
|
DWORD now = tick_function();
|
|
if (now < last_seen_now)
|
|
rollover_ms += 0x100000000I64; // ~49.7 days.
|
|
last_seen_now = now;
|
|
return TimeDelta::FromMilliseconds(now + rollover_ms);
|
|
}
|
|
|
|
bool IsBuggyAthlon(const base::CPU& cpu) {
|
|
// On Athlon X2 CPUs (e.g. model 15) QueryPerformanceCounter is
|
|
// unreliable. Fallback to low-res clock.
|
|
return cpu.vendor_name() == "AuthenticAMD" && cpu.family() == 15;
|
|
}
|
|
|
|
// Overview of time counters:
|
|
// (1) CPU cycle counter. (Retrieved via RDTSC)
|
|
// The CPU counter provides the highest resolution time stamp and is the least
|
|
// expensive to retrieve. However, the CPU counter is unreliable and should not
|
|
// be used in production. Its biggest issue is that it is per processor and it
|
|
// is not synchronized between processors. Also, on some computers, the counters
|
|
// will change frequency due to thermal and power changes, and stop in some
|
|
// states.
|
|
//
|
|
// (2) QueryPerformanceCounter (QPC). The QPC counter provides a high-
|
|
// resolution (100 nanoseconds) time stamp but is comparatively more expensive
|
|
// to retrieve. What QueryPerformanceCounter actually does is up to the HAL.
|
|
// (with some help from ACPI).
|
|
// According to http://blogs.msdn.com/oldnewthing/archive/2005/09/02/459952.aspx
|
|
// in the worst case, it gets the counter from the rollover interrupt on the
|
|
// programmable interrupt timer. In best cases, the HAL may conclude that the
|
|
// RDTSC counter runs at a constant frequency, then it uses that instead. On
|
|
// multiprocessor machines, it will try to verify the values returned from
|
|
// RDTSC on each processor are consistent with each other, and apply a handful
|
|
// of workarounds for known buggy hardware. In other words, QPC is supposed to
|
|
// give consistent result on a multiprocessor computer, but it is unreliable in
|
|
// reality due to bugs in BIOS or HAL on some, especially old computers.
|
|
// With recent updates on HAL and newer BIOS, QPC is getting more reliable but
|
|
// it should be used with caution.
|
|
//
|
|
// (3) System time. The system time provides a low-resolution (typically 10ms
|
|
// to 55 milliseconds) time stamp but is comparatively less expensive to
|
|
// retrieve and more reliable.
|
|
class HighResNowSingleton {
|
|
public:
|
|
static HighResNowSingleton* GetInstance() {
|
|
return Singleton<HighResNowSingleton>::get();
|
|
}
|
|
|
|
bool IsUsingHighResClock() {
|
|
return ticks_per_second_ != 0.0;
|
|
}
|
|
|
|
void DisableHighResClock() {
|
|
ticks_per_second_ = 0.0;
|
|
}
|
|
|
|
TimeDelta Now() {
|
|
if (IsUsingHighResClock())
|
|
return TimeDelta::FromMicroseconds(UnreliableNow());
|
|
|
|
// Just fallback to the slower clock.
|
|
return RolloverProtectedNow();
|
|
}
|
|
|
|
int64 GetQPCDriftMicroseconds() {
|
|
if (!IsUsingHighResClock())
|
|
return 0;
|
|
return abs((UnreliableNow() - ReliableNow()) - skew_);
|
|
}
|
|
|
|
int64 QPCValueToMicroseconds(LONGLONG qpc_value) {
|
|
if (!ticks_per_second_)
|
|
return 0;
|
|
|
|
// Intentionally calculate microseconds in a round about manner to avoid
|
|
// overflow and precision issues. Think twice before simplifying!
|
|
int64 whole_seconds = qpc_value / ticks_per_second_;
|
|
int64 leftover_ticks = qpc_value % ticks_per_second_;
|
|
int64 microseconds = (whole_seconds * Time::kMicrosecondsPerSecond) +
|
|
((leftover_ticks * Time::kMicrosecondsPerSecond) /
|
|
ticks_per_second_);
|
|
return microseconds;
|
|
}
|
|
|
|
private:
|
|
HighResNowSingleton()
|
|
: ticks_per_second_(0),
|
|
skew_(0) {
|
|
InitializeClock();
|
|
|
|
base::CPU cpu;
|
|
if (IsBuggyAthlon(cpu))
|
|
DisableHighResClock();
|
|
}
|
|
|
|
// Synchronize the QPC clock with GetSystemTimeAsFileTime.
|
|
void InitializeClock() {
|
|
LARGE_INTEGER ticks_per_sec = {0};
|
|
if (!QueryPerformanceFrequency(&ticks_per_sec))
|
|
return; // Broken, we don't guarantee this function works.
|
|
ticks_per_second_ = ticks_per_sec.QuadPart;
|
|
|
|
skew_ = UnreliableNow() - ReliableNow();
|
|
}
|
|
|
|
// Get the number of microseconds since boot in an unreliable fashion.
|
|
int64 UnreliableNow() {
|
|
LARGE_INTEGER now;
|
|
QueryPerformanceCounter(&now);
|
|
return QPCValueToMicroseconds(now.QuadPart);
|
|
}
|
|
|
|
// Get the number of microseconds since boot in a reliable fashion.
|
|
int64 ReliableNow() {
|
|
return RolloverProtectedNow().InMicroseconds();
|
|
}
|
|
|
|
int64 ticks_per_second_; // 0 indicates QPF failed and we're broken.
|
|
int64 skew_; // Skew between lo-res and hi-res clocks (for debugging).
|
|
|
|
friend struct DefaultSingletonTraits<HighResNowSingleton>;
|
|
};
|
|
|
|
TimeDelta HighResNowWrapper() {
|
|
return HighResNowSingleton::GetInstance()->Now();
|
|
}
|
|
|
|
typedef TimeDelta (*NowFunction)(void);
|
|
NowFunction now_function = RolloverProtectedNow;
|
|
|
|
bool CPUReliablySupportsHighResTime() {
|
|
base::CPU cpu;
|
|
if (!cpu.has_non_stop_time_stamp_counter())
|
|
return false;
|
|
|
|
if (IsBuggyAthlon(cpu))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
} // namespace
|
|
|
|
// static
|
|
TimeTicks::TickFunctionType TimeTicks::SetMockTickFunction(
|
|
TickFunctionType ticker) {
|
|
base::AutoLock locked(rollover_lock);
|
|
TickFunctionType old = tick_function;
|
|
tick_function = ticker;
|
|
rollover_ms = 0;
|
|
last_seen_now = 0;
|
|
return old;
|
|
}
|
|
|
|
// static
|
|
bool TimeTicks::SetNowIsHighResNowIfSupported() {
|
|
if (!CPUReliablySupportsHighResTime()) {
|
|
return false;
|
|
}
|
|
|
|
now_function = HighResNowWrapper;
|
|
return true;
|
|
}
|
|
|
|
// static
|
|
TimeTicks TimeTicks::Now() {
|
|
return TimeTicks() + now_function();
|
|
}
|
|
|
|
// static
|
|
TimeTicks TimeTicks::HighResNow() {
|
|
return TimeTicks() + HighResNowSingleton::GetInstance()->Now();
|
|
}
|
|
|
|
// static
|
|
TimeTicks TimeTicks::ThreadNow() {
|
|
NOTREACHED();
|
|
return TimeTicks();
|
|
}
|
|
|
|
// static
|
|
TimeTicks TimeTicks::NowFromSystemTraceTime() {
|
|
return HighResNow();
|
|
}
|
|
|
|
// static
|
|
int64 TimeTicks::GetQPCDriftMicroseconds() {
|
|
return HighResNowSingleton::GetInstance()->GetQPCDriftMicroseconds();
|
|
}
|
|
|
|
// static
|
|
TimeTicks TimeTicks::FromQPCValue(LONGLONG qpc_value) {
|
|
return TimeTicks(
|
|
HighResNowSingleton::GetInstance()->QPCValueToMicroseconds(qpc_value));
|
|
}
|
|
|
|
// static
|
|
bool TimeTicks::IsHighResClockWorking() {
|
|
return HighResNowSingleton::GetInstance()->IsUsingHighResClock();
|
|
}
|
|
|
|
TimeTicks TimeTicks::UnprotectedNow() {
|
|
if (now_function == HighResNowWrapper) {
|
|
return Now();
|
|
} else {
|
|
return TimeTicks() + TimeDelta::FromMilliseconds(timeGetTime());
|
|
}
|
|
}
|
|
|
|
// TimeDelta ------------------------------------------------------------------
|
|
|
|
// static
|
|
TimeDelta TimeDelta::FromQPCValue(LONGLONG qpc_value) {
|
|
return TimeDelta(
|
|
HighResNowSingleton::GetInstance()->QPCValueToMicroseconds(qpc_value));
|
|
}
|