【行単位で排他】std::ostreamのお手軽カスタマイズ【時刻付き】(1)

仕事においてC++の複雑さに遊ばれるのは時間の無駄以外の何者でもないが、遊びならおk

解決すべき課題

まず、基本事項として、std::ostreamへの書き込みはスレッドセーフだる
しかしこれは「一つのストリームに複数のスレッドから非同期に書き込んでもハングアップはしないﾆﾀﾞ」程度の意味であって、このままでは使えないこと甚だしい
例えば、次のコードと実行結果を見られたい：
＜コード＞

#include <process.h>

unsigned __stdcall ThreadFunc1(void* exinf)
{
    std::ostream& ost = *(std::ostream*)exinf;

    for (int n = 10; n > 0; --n) {
        for (int k = 100; k > 0; --k) {     // ostreamのバッファに収まらない行を作成
            ost << "Hello World! ";
        }
        ost << std::endl;   // 最後に改行兼明示的flush
    }
    return 0;
}

unsigned __stdcall ThreadFunc2(void* exinf)
{
    std::ostream& ost = *(std::ostream*)exinf;

    for (int n = 10; n > 0; --n) {
        for (int k = 100; k > 0; --k) {     // ostreamのバッファに収まらない行を作成
            ost << "This is a pen. ";
        }
        ost << std::endl;   // 最後に改行兼明示的flush
    }
    return 0;
}

void test1()
{
    HANDLE threads[2];

    uintptr_t result1 = _beginthreadex(NULL, 0, ThreadFunc1, &std::cout, CREATE_SUSPENDED, NULL); 
    threads[0] = (HANDLE)result1;

    uintptr_t result2 = _beginthreadex(NULL, 0, ThreadFunc2, &std::cout, CREATE_SUSPENDED, NULL); 
    threads[1] = (HANDLE)result2;

    for (int i = 0; i < NUMELEMS(threads); ++i) {
        ResumeThread(threads[i]);
    }

    WaitForMultipleObjects(2, threads, TRUE, INFINITE);
}

＜test1()の実行結果＞

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Hello World! Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. Hello World! This is a pen. 
This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. 

意図としては、

• "Hello World! "が100個並んだ行

と

• "This is a pen."が100個並んだ行

とが、すっきり交代で現れてほしいのだが、いろいろ混ざっﾄﾙ、

解決方法

そこで、SafeStreamBufferなるクラスを作ってみた
このようにして使うｽﾐﾀﾞ:
＜コード＞

#include <process.h>

unsigned __stdcall ThreadFunc1(void* exinf)
{
    std::ostream& ost = *(std::ostream*)exinf;

    for (int n = 10; n > 0; --n) {
        for (int k = 100; k > 0; --k) {     // ostreamのバッファに収まらない行を作成
            ost << "Hello World! ";
        }
        ost << std::endl;   // 最後に改行兼明示的flush
    }
    return 0;
}

unsigned __stdcall ThreadFunc2(void* exinf)
{
    std::ostream& ost = *(std::ostream*)exinf;

    for (int n = 10; n > 0; --n) {
        for (int k = 100; k > 0; --k) {     // ostreamのバッファに収まらない行を作成
            ost << "This is a pen. ";
        }
        ost << std::endl;   // 最後に改行兼明示的flush
    }
    return 0;
}

void test2()
{
    CCritSec syncRoot;

    SafeStreamBuffer sfbuf1(std::cin, std::cout, syncRoot);
    std::ostream ost1(&sfbuf1);

    SafeStreamBuffer sfbuf2(std::cin, std::cout, syncRoot);
    std::ostream ost2(&sfbuf2);

    HANDLE threads[2];

    uintptr_t result1 = _beginthreadex(NULL, 0, ThreadFunc1, &ost1, CREATE_SUSPENDED, NULL); 
    threads[0] = (HANDLE)result1;

    uintptr_t result2 = _beginthreadex(NULL, 0, ThreadFunc2, &ost2, CREATE_SUSPENDED, NULL); 
    threads[1] = (HANDLE)result2;

    for (int i = 0; i < NUMELEMS(threads); ++i) {
        ResumeThread(threads[i]);
    }

    WaitForMultipleObjects(2, threads, TRUE, INFINITE);
}

＜test2()の実行結果＞

[2012-02-19T23:15:14.0458] Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! 
[2012-02-19T23:15:14.0458] This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. 
[2012-02-19T23:15:14.0459] Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! 
[2012-02-19T23:15:14.0459] This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. 
[2012-02-19T23:15:14.0459] Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! 
[2012-02-19T23:15:14.0459] This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. 
[2012-02-19T23:15:14.0459] Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! 
[2012-02-19T23:15:14.0459] This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. 
[2012-02-19T23:15:14.0459] Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! 
[2012-02-19T23:15:14.0459] This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. 
[2012-02-19T23:15:14.0459] Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! 
[2012-02-19T23:15:14.0459] This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. 
[2012-02-19T23:15:14.0460] Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! 
[2012-02-19T23:15:14.0460] This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. 
[2012-02-19T23:15:14.0460] Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! Hello World! 
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[2012-02-19T23:15:14.0460] This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. 
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[2012-02-19T23:15:14.0461] This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. This is a pen. 

ｽｷｰﾘ(・∀・）
各行頭の出力時刻はおまけで付けといた（つづく）