What is the fastest method in C++, to read a new line from a file which is written by another process. Or how my program can be notified that there is a new line in file so read it? (in linux)
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The fastest method is to use pipes or events (for Windows apps).
If you still want use files, first of all that you really need, making sure, that a file has been really modified (use seek and compare it with prew value). Than go to the ‘last val of seek’ and read it.
And it will be better use mutex (if you read data from file).