But the other way is fine? That is, function1 may crash and take with it the entire process?

What you could do is for each line, fork twice. First child calls function1, second child calls function2. Both children exit afterwards. Parent waits till children are done before reading the next batch. Then the process will not be stopped if either function crashes on a batch.

In reply to Re^3: while reading a file, transfer the same data to two different processes. by JavaFan
in thread while reading a file, transfer the same data to two different processes. by avanta

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