pthread and fprintf(file_descriptor,..) question

I can use pthread_create() to kick off 7 threads, each thread contains a fprintf(unique_fid) command

However I have noticed when running the 7 threads, the fprintf command seems to use all defined unique_fid's not just the sole one assigned to a thread, so the data gets shuffled when printing.

Why are running pthreads mixing up the file descriptors?

Please show the code that exhibits the problem.
The most obvious answer:

Each thread does not have a unique file descriptor and instead you are having all threads access the same file.

How are you ensuring that each thread has a unique file?
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