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| Guest |
 Posted: Wed Sep 28, 2011 2:57 am |
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| Guest |
| Posted: Wed Sep 28, 2011 7:31 am |
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| Guest |
| Posted: Wed Sep 28, 2011 7:53 am |
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| tonyrog |
| Posted: Wed Sep 28, 2011 8:48 am |
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Joined: 12 Sep 2009
Posts: 43
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I do not think there is a way to extract that number (except for a small hack, of course)
Care to tell the reason behind why you need it ?
/Tony
On 28 sep 2011, at 09:53, Jovi Zhang wrote:
Quote: On Wed, Sep 28, 2011 at 3:31 PM, Anthony Ramine <nox@dev-extend.eu (nox@dev-extend.eu)> wrote:
Quote: Are you looking for enif_self() [1]?
enif_self only return ErlNifPid, but I want to get pid number.
like pid is <0.32.0>, what I want to get is 32, is there any way to
get number? Thanks!
ErlNifPid* enif_self(ErlNifEnv* caller_env, ErlNifPid* pid)
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| Guest |
| Posted: Wed Sep 28, 2011 9:04 am |
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On Wed, Sep 28, 2011 at 4:48 PM, Tony Rogvall <tony@rogvall.se> wrote:
> I do not think there is a way to extract that number (except for a small
> hack, of course)
> Care to tell the reason behind why you need it ?
> /Tony
>
Hmm, I'm writing a NIF library to let erlang process communicate with
external hand. we call that as "hand", it is similar with erlang
process, but with different number reference, hand is range from
0-65535.
So in this NIF library I must remember the mapping of
"process<->hand", actually I only run this in one node, with process
like <0.X.0>,
which I only care about process number, that's why I want to get
process number, not whole pid structure.
Of course I can store all "ErlNifPid<->hand index", but that will
consume a lot of memory.
I think erts should provide API or macro for get process number for
some use case.
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| Guest |
| Posted: Wed Sep 28, 2011 1:15 pm |
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Someone must correct if I am wrong here but I don't think that an ErlNifPid takes much space. As I understand it is not the whole process structure, just a reference to it. From erl_nif.h:
#ifdef HALFWORD_HEAP_EMULATOR
# define ERL_NIF_VM_VARIANT "beam.halfword"
typedef unsigned int ERL_NIF_TERM;
#else
# define ERL_NIF_VM_VARIANT "beam.vanilla"
typedef unsigned long ERL_NIF_TERM;
#endif
...
typedef struct
{
ERL_NIF_TERM pid; /* internal, may change */
}ErlNifPid;
But someone more knowledgeable should confirm this.
Robert
----- Original Message -----
> On Wed, Sep 28, 2011 at 4:48 PM, Tony Rogvall <tony@rogvall.se>
> wrote:
> > I do not think there is a way to extract that number (except for a
> > small
> > hack, of course)
> > Care to tell the reason behind why you need it ?
> > /Tony
> >
>
> Hmm, I'm writing a NIF library to let erlang process communicate with
> external hand. we call that as "hand", it is similar with erlang
> process, but with different number reference, hand is range from
> 0-65535.
>
> So in this NIF library I must remember the mapping of
> "process<->hand", actually I only run this in one node, with process
> like <0.X.0>,
> which I only care about process number, that's why I want to get
> process number, not whole pid structure.
>
> Of course I can store all "ErlNifPid<->hand index", but that will
> consume a lot of memory.
>
> I think erts should provide API or macro for get process number for
> some use case.
> _______________________________________________
> erlang-questions mailing list
> erlang-questions@erlang.org
> http://erlang.org/mailman/listinfo/erlang-questions
>
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| Guest |
| Posted: Wed Sep 28, 2011 6:35 pm |
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Guest
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Yes, ErlNifPid is typically the size of one word. You can type cast it
to an integer type of equal size to get a "process number".
/Sverker, Erlang/OTP
Robert Virding wrote:
> Someone must correct if I am wrong here but I don't think that an ErlNifPid takes much space. As I understand it is not the whole process structure, just a reference to it. From erl_nif.h:
>
> #ifdef HALFWORD_HEAP_EMULATOR
> # define ERL_NIF_VM_VARIANT "beam.halfword"
> typedef unsigned int ERL_NIF_TERM;
> #else
> # define ERL_NIF_VM_VARIANT "beam.vanilla"
> typedef unsigned long ERL_NIF_TERM;
> #endif
>
> ...
>
> typedef struct
> {
> ERL_NIF_TERM pid; /* internal, may change */
> }ErlNifPid;
>
> But someone more knowledgeable should confirm this.
>
> Robert
>
> ----- Original Message -----
>
>> On Wed, Sep 28, 2011 at 4:48 PM, Tony Rogvall <tony@rogvall.se>
>> wrote:
>>
>>> I do not think there is a way to extract that number (except for a
>>> small
>>> hack, of course)
>>> Care to tell the reason behind why you need it ?
>>> /Tony
>>>
>>>
>> Hmm, I'm writing a NIF library to let erlang process communicate with
>> external hand. we call that as "hand", it is similar with erlang
>> process, but with different number reference, hand is range from
>> 0-65535.
>>
>> So in this NIF library I must remember the mapping of
>> "process<->hand", actually I only run this in one node, with process
>> like <0.X.0>,
>> which I only care about process number, that's why I want to get
>> process number, not whole pid structure.
>>
>> Of course I can store all "ErlNifPid<->hand index", but that will
>> consume a lot of memory.
>>
>> I think erts should provide API or macro for get process number for
>> some use case.
>> _______________________________________________
>> erlang-questions mailing list
>> erlang-questions@erlang.org
>> http://erlang.org/mailman/listinfo/erlang-questions
>>
>>
> _______________________________________________
> erlang-questions mailing list
> erlang-questions@erlang.org
> http://erlang.org/mailman/listinfo/erlang-questions
>
>
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| Guest |
| Posted: Thu Sep 29, 2011 1:42 am |
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Guest
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Hmm, understood, Thanks very much, I will store the ErlNifPid instead
of process number.
On Thu, Sep 29, 2011 at 2:35 AM, Sverker Eriksson
<sverker@erix.ericsson.se> wrote:
> Yes, ErlNifPid is typically the size of one word. You can type cast it to an
> integer type of equal size to get a "process number".
>
> /Sverker, Erlang/OTP
>
> Robert Virding wrote:
>>
>> Someone must correct if I am wrong here but I don't think that an
>> ErlNifPid takes much space. As I understand it is not the whole process
>> structure, just a reference to it. From erl_nif.h:
>>
>> #ifdef HALFWORD_HEAP_EMULATOR
>> # define ERL_NIF_VM_VARIANT "beam.halfword" typedef unsigned int
>> ERL_NIF_TERM;
>> #else
>> # define ERL_NIF_VM_VARIANT "beam.vanilla" typedef unsigned long
>> ERL_NIF_TERM;
>> #endif
>>
>> ...
>>
>> typedef struct
>> {
>> ERL_NIF_TERM pid; /* internal, may change */
>> }ErlNifPid;
>>
>> But someone more knowledgeable should confirm this.
>>
>> Robert
>>
>> ----- Original Message -----
>>
>>>
>>> On Wed, Sep 28, 2011 at 4:48 PM, Tony Rogvall <tony@rogvall.se>
>>> wrote:
>>>
>>>>
>>>> I do not think there is a way to extract that number (except for a
>>>> small
>>>> hack, of course)
>>>> Care to tell the reason behind why you need it ?
>>>> /Tony
>>>>
>>>>
>>>
>>> Hmm, I'm writing a NIF library to let erlang process communicate with
>>> external hand. we call that as "hand", it is similar with erlang
>>> process, but with different number reference, hand is range from
>>> 0-65535.
>>>
>>> So in this NIF library I must remember the mapping of
>>> "process<->hand", actually I only run this in one node, with process
>>> like <0.X.0>,
>>> which I only care about process number, that's why I want to get
>>> process number, not whole pid structure.
>>>
>>> Of course I can store all "ErlNifPid<->hand index", but that will
>>> consume a lot of memory.
>>>
>>> I think erts should provide API or macro for get process number for
>>> some use case.
>>> _______________________________________________
>>> erlang-questions mailing list
>>> erlang-questions@erlang.org
>>> http://erlang.org/mailman/listinfo/erlang-questions
>>>
>>>
>>
>> _______________________________________________
>> erlang-questions mailing list
>> erlang-questions@erlang.org
>> http://erlang.org/mailman/listinfo/erlang-questions
>>
>>
>
>
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