package rpc_parallel

module Worker = Make(T)

start_app command should be called from the top-level in order to start the parallel application. This function will parse certain environment variables and determine whether to start as a master or a worker.

rpc_max_message_size, rpc_handshake_timeout, rpc_heartbeat_config can be used to alter the rpc defaults. These rpc settings will be used for all connections. This can be useful if you have long async jobs.

when_parsing_succeeds will be passed to Command.run in the master process.

Use State.get to query whether the current process has been initialized as an rpc parallel master (start_app or init_master_exn has been called). We return a State.t rather than a bool so that you can require evidence at the type level. If you want to certify, as a precondition, for some function that start_app was used, require a State.t as an argument. If you don't need the State.t anymore, just pattern match on it.

If you want more direct control over your executable, you can use the Expert module instead of start_app. If you use Expert, you are responsible for starting the master and worker rpc servers. worker_command_args will be the arguments sent to each spawned worker. Running your executable with these args must follow a code path that calls worker_init_before_async_exn and then start_worker_server_exn. An easy way to do this is to use worker_command.