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* Copyright 2010 Google Inc.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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// Author: jmarantz@google.com (Joshua Marantz)
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#ifndef PAGESPEED_KERNEL_BASE_TIMER_H_
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#define PAGESPEED_KERNEL_BASE_TIMER_H_
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#include "pagespeed/kernel/base/basictypes.h"
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namespace net_instaweb {
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// Timer interface, made virtual so it can be mocked for tests.
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// Note: it's important that these stay compile-time constants, to
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// avoid weird init order surprises. (Noticed in the wild on Mac).
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// If you get a link error due to one of these missing, you're trying
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// to pass it in by a const reference. You can do something like * 1 to
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// sidestep the issue.
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static const int64 kSecondMs = 1000;
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static const int64 kMsUs = 1000;
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static const int64 kSecondUs = kMsUs * kSecondMs;
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static const int64 kSecondNs = 1000 * kSecondUs;
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static const int64 kMinuteMs = 60 * kSecondMs;
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static const int64 kMinuteUs = 60 * kSecondUs;
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static const int64 kHourMs = 60 * kMinuteMs;
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static const int64 kDayMs = 24 * kHourMs;
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static const int64 kWeekMs = 7 * kDayMs;
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static const int64 kMonthMs = 31 * kDayMs;
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static const int64 kYearMs = 365 * kDayMs;
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// Returns number of milliseconds since 1970.
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virtual int64 NowMs() const;
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// Returns number of microseconds since 1970.
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virtual int64 NowUs() const = 0;
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// Sleep for given number of milliseconds.
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virtual void SleepMs(int64 ms);
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// Sleep for given number of microseconds.
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virtual void SleepUs(int64 us) = 0;
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} // namespace net_instaweb
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#endif // PAGESPEED_KERNEL_BASE_TIMER_H_