verdnatura-chat/ios/Pods/Folly/folly/GLog.h

60 lines
2.8 KiB
C++

/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* 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.
*/
#pragma once
#include <atomic>
#include <chrono>
#include <glog/logging.h>
#ifndef FB_LOG_EVERY_MS
/**
* Issues a LOG(severity) no more often than every
* milliseconds. Example:
*
* FB_LOG_EVERY_MS(INFO, 10000) << "At least ten seconds passed"
* " since you last saw this.";
*
* The implementation uses for statements to introduce variables in
* a nice way that doesn't mess surrounding statements. It is thread
* safe. Non-positive intervals will always log.
*/
#define FB_LOG_EVERY_MS(severity, milli_interval) \
for (decltype(milli_interval) FB_LEM_once = 1, \
FB_LEM_interval = (milli_interval); \
FB_LEM_once;) \
for (::std::chrono::milliseconds::rep FB_LEM_prev, \
FB_LEM_now = FB_LEM_interval <= 0 \
? 0 \
: ::std::chrono::duration_cast<::std::chrono::milliseconds>( \
::std::chrono::system_clock::now().time_since_epoch()) \
.count(); \
FB_LEM_once;) \
for (static ::std::atomic<::std::chrono::milliseconds::rep> FB_LEM_hist; \
FB_LEM_once; \
FB_LEM_once = 0) \
if (FB_LEM_interval > 0 && \
(FB_LEM_now - \
(FB_LEM_prev = \
FB_LEM_hist.load(std::memory_order_acquire)) < \
FB_LEM_interval || \
!FB_LEM_hist.compare_exchange_strong(FB_LEM_prev, FB_LEM_now))) { \
} else \
LOG(severity)
#endif