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Is extracting the first line from a file that is accessed via NFS thread safe?

If I mount a directory via NFS on multiple servers each running a process that reads and deletes the first line of a specific file in that directory, can it somehow be guaranteed that no line is read ...
4
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Multiple appenders writing to the same file on NFS share

If I have 100 servers execute a command, and each redirects their output to the same file on an NFS share, will the resultant file be interleaved neatly or can it become corrupt? For example, if this ...
6
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Is `ln` atomic and reliable on NFS? Could NFS replace GFS in this use case?

I have a cluster with a bunch of servers with a shared disk containing a GFS global file system that all nodes access simultaneously. Each node in the cluster run the same program (a shell script is ...