Are fprintf and fscanf reentrant when using different file handles

Question

Can I have 2 threads in the same process calling fprintf or fscanf at the same time?

One stream is written to by the first thread and is read by the second thread and the other stream is read by the first thread and is written to by the second thread. So, I don't have a situation of simultaneous writes or simultaneous reads to the same stream.

If the answer is no - Do I have an reentrant alternative in the printf/scanf family?

This questions follows some comments in: Thread communication via printf and scanf (linux)

Deadlock is possible. Both threads reading, waiting for the other thread to write. — Hans Passant, Jun 30 '11 at 00:37

score 2 · Accepted Answer · answered Jun 30 '11 at 01:59

2

They are thread-safe. See http://www.unix.org/whitepapers/reentrant.html

answered Jun 30 '11 at 01:59

Igor Nazarenko

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Are fprintf and fscanf reentrant when using different file handles

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