rpc模块¶

Remote Procedure Call services

call/4/5¶

结构:

call(Node, Module, Function, Args) -> Res | {badrpc, Reason}
call(Node, Module, Function, Args, Timeout) ->
        Res | {badrpc, Reason}
类型:
Node = node()
Module = module()
Function = atom()
Args = [term()]
Res = Reason = term()

multicall/3/4/5¶

结构:

multicall/3:
multicall([node()|nodes()], Module, Function, Args, infinity).
multicall/4:
multicall([node()|nodes()], Module, Function, Args, Timeout).

multicall(Nodes, Module, Function, Args, Timeout) ->
           {ResL, BadNodes}
类型:
Nodes = [node()]
ResL = [Res :: term() | {badrpc, Reason :: term()}]
BadNodes = [node()]

说明:

并发调用多个node的rpc请求

实例:

%% Find object code for module Mod
{Mod, Bin, File} = code:get_object_code(Mod),
%% and load it on all nodes including this one
{ResL, _} = rpc:multicall(code, load_binary, [Mod, File, Bin]),
%% and then maybe check the ResL list.