How to buffer stdout in memory and write it from a dedicated thread

Question

I have a C application with many worker threads. It is essential that these do not block so where the worker threads need to write to a file on disk, I have them write to a

Answer 1

One solution ( for both things your doing ) would be to use a gathering write via writev.

Each thread could for example sprintf into a iovec buffer and then pass the iovec pointers to the writer thread and have it simply call writev with stdout.

Here is an example of using writev from Advanced Unix Programming

Under Windows you would use WSAsend for similar functionality.