semaphore-compat

semaphore-compat provides cross-platform semaphores that can be shared across processes.

It uses different backends on different platforms:

• POSIX: Unix domain sockets with automatic return of tokens from disconnected clients.
• Windows: Win32 named semaphores. Tokens held by crashed clients are not returned automatically.
• wasm/JavaScript: buildable stubs that throw unsupported-operation errors. Avoid calling this code on these backends.

It supports:

• Creating server semaphores (createSemaphore, freshSemaphore).
  • A server is the process that creates the semaphore and must stay alive for the duration of its use.
  • A server process can also act as a client and request/release tokens from the semaphore.
• Opening client semaphores (openSemaphore).
• Waiting with tryWaitOnSemaphore or interruptible waitOnSemaphore, which return SemaphoreTokens.
• Releasing tokens with releaseSemaphoreToken or withSemaphoreToken.
• Destroying semaphores with destroyClientSemaphore and destroyServerSemaphore.
• Serialising names and checking versions with semaphoreIdentifier and versionsAreCompatible.

cabal install semaphore-compat