?
Solved

Fastest way for writing in text files in a MultiThreading application

Posted on 2003-11-13
3
Medium Priority
?
758 Views
Last Modified: 2007-12-19
Hi,

I have an application that logs information into a text file, there are multiple threads in the file logging information. Sometimes when the application starts a high load, some entries are not logged in the file, but I have tested that errors happens only in the logging, because the missed entries are recorded in a database, for example.

so, I'm looking for the fastest way to lock this file and save the information, by now I'm using CreateFile like this, without sharing for locking automatically :


      m_hFile = CreateFile
      (
      myFileName,
      GENERIC_WRITE,
      0,
      NULL,
      OPEN_ALWAYS,
      FILE_ATTRIBUTE_NORMAL,
      NULL
      );

The file is created hourly, in the name of the file is the date including current hour.

Environment:
Visual C++ 6.0
Windows 2000 AS

What is the better way for doing this? maybe with fopen, fprintf or fwrite, with mutexes or a critical section?  

thanks in advance

cero
0
Comment
Question by:cero
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 86

Accepted Solution

by:
jkr earned 800 total points
ID: 9742800
Simply protect write access to the log file with critical sections:

CRITICAL_SECTION g_csLogFile; // initialize it using 'InitializeCriticalSection()'

void Log ( const char* p) {

    EnterCriticalSection ( &g_csLogFile);

    // write...

    LeaveCriticalSection ( &g_csLogFile);
}

this is the 'least cost' and yet effective way to do that.
0
 
LVL 9

Expert Comment

by:tinchos
ID: 10249148
No comment has been added lately, so it's time to clean up this TA.
I will leave the following recommendation for this question in the Cleanup topic area:

Accept: jkr {http:#9742800}

Please leave any comments here within the next seven days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

Tinchos
EE Cleanup Volunteer
0

Featured Post

[Webinar] How Hackers Steal Your Credentials

Do You Know How Hackers Steal Your Credentials? Join us and Skyport Systems to learn how hackers steal your credentials and why Active Directory must be secure to stop them.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

What is C++ STL?: STL stands for Standard Template Library and is a part of standard C++ libraries. It contains many useful data structures (containers) and algorithms, which can spare you a lot of the time. Today we will look at the STL Vector. …
IntroductionThis article is the second in a three part article series on the Visual Studio 2008 Debugger.  It provides tips in setting and using breakpoints. If not familiar with this debugger, you can find a basic introduction in the EE article loc…
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.
Suggested Courses
Course of the Month9 days, 4 hours left to enroll

765 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question