Created
November 29, 2010 07:03
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client server erl
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-module(f). | |
-export([init/0]). | |
-export([start/0, get_freq/0, stop/0]). | |
-export([allocate/0, deallocate/1]). | |
%% | |
%% server functions | |
%% | |
start()-> | |
register(f, spawn(f, init, [])). | |
init() -> | |
Freq = {get_freq(), []}, | |
loop(Freq). | |
get_freq()-> | |
[10,11,12,13,14,15]. | |
% | |
% client functions | |
% | |
stop() -> call(stop). | |
allocate() -> call(allocate). | |
deallocate(Freq) -> call({deallocate, Freq}). | |
call( Message ) -> | |
f ! { request, self(), Message }, | |
receive | |
{reply, Reply} -> | |
Reply | |
end. | |
% | |
% The main loop | |
% | |
loop(Frequencies) -> | |
receive | |
{request, Pid, allocate} -> | |
{NewFreq, Reply} = allocate(Frequencies, Pid), | |
reply(Pid, Reply), | |
loop(NewFreq); | |
{request, Pid, {deallocate, Freq}} -> | |
NewFreq = deallocate(Frequencies, Freq), | |
reply(Pid, ok), | |
loop(NewFreq); | |
{request, Pid, stop} -> | |
reply(Pid, ok) | |
end. | |
reply(Pid, Reply) -> | |
Pid ! Reply. | |
% | |
% allocate & deallocate | |
% | |
allocate({[], Allocated}, _Pid)-> | |
{{[], Allocated}, {error, no_freqquency}}; | |
allocate({[Freq | Free], Allocated}, Pid) -> | |
{{Free, [{Freq , Pid} | Allocated]}, {ok, Freq}}. | |
deallocate({Free, Allocated}, Freq) -> | |
NewAlloc = lists:keydelete(Freq, 1, Allocated), | |
{[Freq | Free], NewAlloc}. |
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