# `SuperPi.Env.Shared`
[🔗](https://github.com/oleksandr/super-pi-beam/blob/v0.1.0/lib/super_pi/env/shared.ex#L1)

Execution environment for a workspace on shared storage (NFS, CephFS, a read-write-many volume).

Reads, listing and commands are the same as `SuperPi.Env.Local`. Writes and edits also take a
PostgreSQL advisory lock for the path, so two nodes cannot change the same file at once. The
`SuperPi.Env.FileLock` that `Local` uses only serializes writers on one node.

With SQLite (one node) there is no other node, so the local lock is enough and no advisory lock
is taken.

# `lock_key`

Key of the advisory lock for a path: a signed 64-bit integer from a hash of the path.

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*Consult [api-reference.md](api-reference.md) for complete listing*