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<  Erlang bugs mailing list  ~  gen_server and {spawn_opt, [monitor]}
Guest
Posted: Thu Nov 23, 2006 10:48 pm Reply with quote
Guest
Hi Erlangers

I found a bug in proc_lib, on windows (C:Program Fileserl5.5.2libstdlib-1.14.2srcproc_lib.erl).

If one call gen_server:start(Module, start, Args, [{spawn_opt, [monitor]}]) the call will not return !

Some analysis yields that the cause is that the gen_server:start() call ends up in erlang:spawn_opt(..., [monitor]) which return {Pid, Monitor}, making the proc_lib:sync_wait() wait for {Pid, Monitor} and not Pid which is what the newly spawned process sends in the ack-message.

My guess of a fix is that proc_lib:spawn_opt() checks the return value from erlang:spawn_opt(). I'm including an untested fix.

Cheers
/Fredrik

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Guest
Posted: Fri Nov 24, 2006 9:23 am Reply with quote
Guest
Hi,

Thanks for your bug report. The error will be corrected in R11B-3.

Regards,
Gunilla, Erlang/OTP team

Fredrik Linder wrote:
> Hi Erlangers
>
> I found a bug in proc_lib, on windows (C:\Program
> Files\erl5.5.2\lib\stdlib-1.14.2\src\proc_lib.erl).
>
> If one call gen_server:start(Module, start, Args, [{spawn_opt,
> [monitor]}]) the call will not return !
>
> Some analysis yields that the cause is that the gen_server:start() call
> ends up in erlang:spawn_opt(..., [monitor]) which return {Pid, Monitor},
> making the proc_lib:sync_wait() wait for {Pid, Monitor} and not Pid
> which is what the newly spawned process sends in the ack-message.
>
> My guess of a fix is that proc_lib:spawn_opt() checks the return value
> from erlang:spawn_opt(). I'm including an untested fix.
>
> Cheers
> /Fredrik

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