mirror of https://gitee.com/bigwinds/arangodb
96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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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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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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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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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#include "OpenFilesTracker.h"
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#include "Logger/Logger.h"
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using namespace arangodb;
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namespace {
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// single global instance which keeps track of all opened/closed files
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OpenFilesTracker Instance;
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} // namespace
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OpenFilesTracker::OpenFilesTracker() : _warnThreshold(0), _lastWarning(0.0) {}
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OpenFilesTracker::~OpenFilesTracker() {}
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int OpenFilesTracker::create(char const* path, int oflag, int mode) {
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// call underlying open() function from OS
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int res = TRI_CREATE(path, oflag, mode);
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if (res >= 0) {
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LOG_TOPIC(TRACE, Logger::SYSCALL)
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<< "created file '" << path << "' was assigned file descriptor " << res;
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increase();
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}
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return res;
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}
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int OpenFilesTracker::open(char const* path, int oflag) {
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// call underlying open() function from OS
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int res = TRI_OPEN(path, oflag);
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if (res >= 0) {
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LOG_TOPIC(TRACE, Logger::SYSCALL)
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<< "opened file '" << path << "' was assigned file descriptor " << res;
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increase();
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}
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return res;
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}
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int OpenFilesTracker::close(int fd) noexcept {
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// call underlying close() function from OS
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int res = TRI_CLOSE(fd);
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if (res == TRI_ERROR_NO_ERROR) {
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LOG_TOPIC(TRACE, Logger::SYSCALL) << "closed file with file descriptor " << fd;
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decrease();
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}
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return res;
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}
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void OpenFilesTracker::increase() {
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uint64_t nowOpen = ++_numOpenFiles;
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if (nowOpen > _warnThreshold && _warnThreshold > 0) {
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double now = TRI_microtime();
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if (_lastWarning <= 0.0 || now - _lastWarning >= 30.0) {
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// warn only every x seconds at most
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LOG_TOPIC(WARN, Logger::SYSCALL)
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<< "number of currently open files is now " << nowOpen
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<< " and exceeds the warning threshold value " << _warnThreshold;
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_lastWarning = now;
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}
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}
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}
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void OpenFilesTracker::decrease() noexcept { --_numOpenFiles; }
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OpenFilesTracker* OpenFilesTracker::instance() { return &Instance; }
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