| Author |
Message |
< Erlang ~ semaphore (mutex) |
| vinnitu |
 Posted: Fri Sep 10, 2010 2:50 pm |
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User
Joined: 31 May 2007
Posts: 14
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i found example of mutex in erlang
Can somebody modify it to use it with count like semaphore?
Thx
Code:
-module(mutex).
-export([start/0, stop/0]).
-export([wait/0, signal/0]).
-export([init/0]).
start() ->
register(mutex, spawn(?MODULE, init, [])).
stop() ->
mutex ! stop.
wait() ->
mutex ! {wait, self()},
receive ok -> ok end.
signal() ->
mutex ! {signal, self()},
ok.
init() ->
free().
free() ->
receive
{wait, Pid} ->
Pid ! ok,
busy(Pid);
stop ->
terminate()
end.
busy(Pid) ->
receive
{signal, Pid} ->
free()
end.
terminate() ->
receive
{wait, Pid} ->
exit(Pid, kill),
terminate()
after
0 -> ok
end. |
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| zajda |
| Posted: Sat Sep 11, 2010 10:47 pm |
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Joined: 22 Aug 2009
Posts: 83
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| jwatte |
| Posted: Fri Sep 24, 2010 6:05 pm |
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User
Joined: 10 Feb 2010
Posts: 34
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vinnitu wrote: i found example of mutex in erlang
Writing a process that keeps a count as state is one of the very first Erlang tutorial examples. Adding a list of processes waiting for the semaphore is a minor addition.
However, I think the "Erlang way" is to use a process to "drive" whatever the resource is that you want to serialize, rather than to use a separate synchronization primitive. Or, if your semaphore is counting something like buffers, simply model the producer/consumer relationship directly as communicating processes. |
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| wojtnar |
| Posted: Fri Oct 01, 2010 9:37 am |
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Joined: 05 Feb 2010
Posts: 7
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vinnitu wrote:
i found example of mutex in erlang
Can somebody modify it to use it with count like semaphore?
Is this for fun, work or rather homework?
--Wojtek |
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| wuji |
| Posted: Tue Sep 04, 2012 7:32 am |
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Joined: 10 Aug 2012
Posts: 654
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| dongdongwu |
| Posted: Wed Sep 19, 2012 8:35 am |
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