mongodb/util/util.cpp

// util.cpp

/**
*    Copyright (C) 2008 10gen Inc.
*
*    This program is free software: you can redistribute it and/or  modify
*    it under the terms of the GNU Affero General Public License, version 3,
*    as published by the Free Software Foundation.
*
*    This program is distributed in the hope that it will be useful,
*    but WITHOUT ANY WARRANTY; without even the implied warranty of
*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*    GNU Affero General Public License for more details.
*
*    You should have received a copy of the GNU Affero General Public License
*    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "stdafx.h"
#include "goodies.h"
#include "unittest.h"
#include "top.h"
#include "file_allocator.h"

namespace mongo {

    vector<UnitTest*> *UnitTest::tests = 0;
    bool UnitTest::running = false;

    Nullstream nullstream;
    Logstream logstream;
    int logLevel = 0;
    boost::mutex Logstream::mutex;

    unsigned occasion = 0;
    unsigned occasionR = 0;
    unsigned once = 0;
    bool goingAway = false;

    bool isPrime(int n) {
        int z = 2;
        while ( 1 ) {
            if ( z*z > n )
                break;
            if ( n % z == 0 )
                return false;
            z++;
        }
        return true;
    }

    int nextPrime(int n) {
        n |= 1; // 2 goes to 3...don't care...
        while ( !isPrime(n) )
            n += 2;
        return n;
    }

    struct UtilTest : public UnitTest {
        void run() {
            assert( WrappingInt(0) <= WrappingInt(0) );
            assert( WrappingInt(0) <= WrappingInt(1) );
            assert( !(WrappingInt(1) <= WrappingInt(0)) );
            assert( (WrappingInt(0xf0000000) <= WrappingInt(0)) );
            assert( (WrappingInt(0xf0000000) <= WrappingInt(9000)) );
            assert( !(WrappingInt(300) <= WrappingInt(0xe0000000)) );

            assert( tdiff(3, 4) == 1 );
            assert( tdiff(4, 3) == -1 );
            assert( tdiff(0xffffffff, 0) == 1 );

            assert( isPrime(3) );
            assert( isPrime(2) );
            assert( isPrime(13) );
            assert( isPrime(17) );
            assert( !isPrime(9) );
            assert( !isPrime(6) );
            assert( nextPrime(4) == 5 );
            assert( nextPrime(8) == 11 );

            assert( endsWith("abcde", "de") );
            assert( !endsWith("abcde", "dasdfasdfashkfde") );

            assert( swapEndian(0x01020304) == 0x04030201 );

        }
    } utilTest;
    
    string Top::current_;
    Top::T Top::currentStart_;
    Top::T Top::snapshotStart_ = Top::currentTime();
    Top::D Top::snapshotDuration_;
    Top::UsageMap Top::totalUsage_;
    Top::UsageMap Top::snapshotA_;
    Top::UsageMap Top::snapshotB_;
    Top::UsageMap &Top::snapshot_ = Top::snapshotA_;
    Top::UsageMap &Top::nextSnapshot_ = Top::snapshotB_;
    
#if !defined(_WIN32)
    // The mutex contained in this object may be held on shutdown.
    FileAllocator &theFileAllocator_ = *(new FileAllocator());
    FileAllocator &theFileAllocator() { return theFileAllocator_; }
#endif
} // namespace mongo