Thread started with AfxBeginThread() hogging CPU

UINT __cdecl MyFunction(LPVOID pParam)
{
	Thread_t *pThread = (Thread_t *)pParam;

	pThread->lPos = 0;
	bool bReturn = MySyntaxHighlightFile(pThread->sInputName, pThread->sOutputName, &pThread->lPos);

	return 1;
}


// Copy the input file to the output file inserting RTF markup to syntax color the XML.
bool MySyntaxHighlightFile(const wchar_t *sInputFileName, const wchar_t *sOutputFileName, long *lPos)
{
	FILE *fpIn;
	_wfopen_s(&fpIn, sInputFileName, L"rb");
	if (!fpIn)
		return false;

	FILE *fpOut;
	_wfopen_s(&fpOut, sOutputFileName, L"wb");
	if (!fpIn)
		return false;
	char sTag[1000];
	iTagIndex = 0;
	sTag[0] = 0;

	long long i64FileLength = _filelengthi64(_fileno(fpIn));
	long long i64Step = (long long) ((i64FileLength / 60.0) + 0.5);
	long long i64CurPos = 0;

	bool bInTag = false;
	bool bInAttributes = false;
	bool bAttrValue = false;

	char sBOM[3];
	fread(sBOM, 1, 3, fpIn);				// Swallow the byte-order-mark.

	fputs("{\\rtf1{{\\colortbl ;"
			"\\red0\\greeen0\\blue0;"				// Regular text - black	= 1
			"\\red255\\green0\\blue0;"				// ObjectTag color		= 2
			"\\red0\\green128\\blue255;"			// Tag color			= 3
			"\\red0\\green0\\blue255;"				// Quote color			= 4
			"\\red30\\green150\\blue30;"			// Attribute name color	= 5
			"\\red0\\green0\\blue255;"				// Angle color			= 6
			"\\red192\\green192\\blue192;"			// Comment color		= 7
			"\\red0\\green128\\blue255;}"			// PI color				= 8
			, fpOut);

	unsigned iChar;
	while ((iChar = fgetc(fpIn)) != EOF)
	{
		i64CurPos++;
		switch (iChar)
		{
		case '\r':
			break;						// Don't need carriage returns.

		case '\n':
			fwrite("\\par ", 1, 5, fpOut);
			break;

		case '{':
		case '}':
		case '\\':
			fputc('\\', fpOut); 
			fputc(iChar, fpOut);
			break;

		case '<':
			{
				fputs("\\cf6 ", fpOut);
				fputc(iChar, fpOut);
				int iNextChar = fgetc(fpIn);
				i64CurPos++;
				switch (iNextChar)
				{
				case '!':
					fputs("\\cf7 ", fpOut);
					fputc(iNextChar, fpOut);
					break;

				case '?':
					fputs("\\cf8 ", fpOut);
					fputc(iNextChar, fpOut);
					break;

				case '/':
					fputc(iNextChar, fpOut);
					bInTag = true;
					iTagIndex = 0;
					break;

				default:
					bInTag = true;
					iTagIndex = 0;
					sTag[iTagIndex++] = iNextChar;
					sTag[iTagIndex] = 0;
				}
			}
			continue;

		case '>':
			if (bInTag)
			{
				OutputTag(sTag, fpOut);
				bInTag = false;
			}
			bInAttributes = false;
			fputs("\\cf6 ", fpOut);
			fputc(iChar, fpOut);
			fputs("\\cf1 ", fpOut);
			break;

		case ' ':
			if (bInTag)
			{
				OutputTag(sTag, fpOut);
				bInTag = false;
				bInAttributes = true;
			}
			fputc(iChar, fpOut);
			break;

		case '"':
			if (bInAttributes)
			{
				if (bAttrValue)
					fputs("\\cf4 \"\\cf5 ", fpOut);		// Closing quote for attribute value.
				else
					fputs("\\cf4 \"\\cf1 ", fpOut);		// Opening quote for attribute value.
				bAttrValue = !bAttrValue;
			}
			break;

		default:
			if (bInTag)
			{
				sTag[iTagIndex++] = iChar;
				sTag[iTagIndex] = 0;
			}
			else if (iChar <= 0x7F)
				fputc(iChar, fpOut);
			else
			{
				// Now we have to convert this UTF8 extended character to Unicode.
				unsigned char sUtf8[11];
				int iIndex = 0;
				sUtf8[iIndex++] = iChar;

				// Read in all the bytes of this unicode character.
				while ((iChar = fgetc(fpIn)) != EOF)
				{
					if ((iChar < 0x80) || (iChar > 0xBF) || (iIndex > 9))
						break;
					sUtf8[iIndex++] = iChar;
					i64CurPos++;
				}
				i64CurPos--;
				ungetc(iChar, fpIn);

				sUtf8[iIndex] = 0;
				wchar_t *sUnicode = ATW::UTF82Wide((char *)sUtf8);

				fprintf(fpOut, "\\u%d ?", *sUnicode);	// Extended character.
			}
		}
		if ((i64CurPos % i64Step) == 0)
			(*lPos)++;
	}

	fputs("}", fpOut);

	fclose(fpIn);
	fclose(fpOut);

	return true;
}

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    mProgressBar.StepIt();
    mProgressBar.UpdateWindow();

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     if ((i64CurPos % i64Step) == 0)
      {
	  (*lPos)++;
          Sleep(100);
       }

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