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90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
// @file file_allocator.h
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/* Copyright 2009 10gen Inc.
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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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#include "../pch.h"
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namespace mongo {
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/*
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* Handles allocation of contiguous files on disk. Allocation may be
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* requested asynchronously or synchronously.
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* singleton
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*/
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class FileAllocator : boost::noncopyable {
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/*
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* The public functions may not be called concurrently. The allocation
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* functions may be called multiple times per file, but only the first
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* size specified per file will be used.
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*/
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public:
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void start();
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/**
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* May be called if file exists. If file exists, or its allocation has
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* been requested, size is updated to match existing file size.
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*/
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void requestAllocation( const string &name, long &size );
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/**
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* Returns when file has been allocated. If file exists, size is
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* updated to match existing file size.
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*/
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void allocateAsap( const string &name, unsigned long long &size );
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void waitUntilFinished() const;
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static void ensureLength(int fd , long size);
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/** @return the singletone */
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static FileAllocator * get();
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private:
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FileAllocator();
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#if !defined(_WIN32)
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void checkFailure();
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// caller must hold pendingMutex_ lock. Returns size if allocated or
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// allocation requested, -1 otherwise.
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long prevSize( const string &name ) const;
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// caller must hold pendingMutex_ lock.
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bool inProgress( const string &name ) const;
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/** called from the worked thread */
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static void run( FileAllocator * fa );
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mutable mongo::mutex _pendingMutex;
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mutable boost::condition _pendingUpdated;
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list< string > _pending;
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mutable map< string, long > _pendingSize;
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bool _failed;
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#endif
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static FileAllocator* _instance;
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};
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/** like "mkdir -p" but on parent dir of p rather than p itself */
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void ensureParentDirCreated(const boost::filesystem::path& p);
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} // namespace mongo
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