Re: Semaphore
Re: Semaphore
- Subject: Re: Semaphore
- From: "Rakesh Singhal" <email@hidden>
- Date: Mon, 1 Dec 2008 10:11:02 +0530
The dylib will be installed in /usr/lib/ so I can give path
"/usr/lib/libMyDylib.dylib". Yes it is a good idea. Currently both are
in different folders and I am giving "./" path in both (dylib and app)
and generating same key. I hope it would work. Thanks a lot.
Regards
rksinghal
On Mon, Dec 1, 2008 at 9:48 AM, Luke Hiesterman <email@hidden> wrote:
> How about the path of the library? It must be in some known location to be
> loaded at runtime.
>
> Luke
>
> Sent from my iPhone.
>
> On Nov 30, 2008, at 8:07 PM, Rakesh Singhal <email@hidden>
> wrote:
>
>> Yes that is my query what path to choose to make sure that it would
>> generate same key in both dylib and app.
>>
>> regards
>>
>> On Mon, Dec 1, 2008 at 9:16 AM, Luke Hiesterman <email@hidden>
>> wrote:
>>>
>>> If you use the same path and same id for ftok on both processes then you
>>> will get the same key for use with semget. This is precisely the purpose
>>> of
>>> ftok.
>>>
>>> Luke
>>>
>>> Sent from my iPhone.
>>>
>>> On Nov 30, 2008, at 7:15 PM, Rakesh Singhal <email@hidden>
>>> wrote:
>>>
>>>> Thanks. The problem I have to give file path to generate key. How will
>>>> I ensure that the path I am giving will work always to generate the
>>>> same key? I have one application and another is dynamic library and I
>>>> want to generate the same key in both to use.
>>>>
>>>> Regards
>>>> rksinghal
>>>>
>>>>
>>>> On Mon, Dec 1, 2008 at 12:56 AM, Luke Hiesterman <email@hidden>
>>>> wrote:
>>>>>
>>>>> Why exactly do you want to avoid ftok? It's a good way to generate
>>>>> shared
>>>>> keys.
>>>>>
>>>>> It's always possible to generate an integer key some other way yourself
>>>>> and
>>>>> then you just have to figure out how to communicate it across
>>>>> processes.
>>>>> You
>>>>> could write it to a file or send it over a socket.
>>>>>
>>>>> Luke
>>>>>
>>>>> Sent from my iPhone.
>>>>>
>>>>> On Nov 30, 2008, at 3:25 AM, Rakesh Singhal <email@hidden>
>>>>> wrote:
>>>>>
>>>>>> Is it possible to use semget() without using ftok() for IPC
>>>>>> communication?
>>>>>>
>>>>>> Please suggest me.
>>>>>>
>>>>>> Regards
>>>>>> rksinghal
>>>>>>
>>>>>> On Fri, Nov 28, 2008 at 9:54 AM, Rakesh Singhal
>>>>>> <email@hidden> wrote:
>>>>>>>
>>>>>>> Thanks. Now I am using following set of APIs:
>>>>>>>
>>>>>>> ftok()
>>>>>>> semget()
>>>>>>> semop()
>>>>>>> semctl()
>>>>>>>
>>>>>>> It is working till now :)
>>>>>>>
>>>>>>> Regards
>>>>>>> rksinghal
>>>>>>>
>>>>>>> On Thu, Nov 27, 2008 at 9:49 AM, Terry Lambert <email@hidden>
>>>>>>> wrote:
>>>>>>>>
>>>>>>>> On Nov 26, 2008, at 7:31 PM, Rakesh Singhal wrote:
>>>>>>>>>
>>>>>>>>> Hi all
>>>>>>>>>
>>>>>>>>> I tried to use sem_init() but I think it is not there to use. It is
>>>>>>>>> declared in semaphore.h but when I do man sem_init() then it gives
>>>>>>>>> the
>>>>>>>>> message "No manual entry for sem_init".
>>>>>>>>>
>>>>>>>>> Now, I am using sem_open(). I think it is right API to create
>>>>>>>>> unique
>>>>>>>>> semaphore between multi-processes. But creating it in one process
>>>>>>>>> if
>>>>>>>>> I
>>>>>>>>> try to create in another process, the value of semaphore is not
>>>>>>>>> same.
>>>>>>>>> I am using same name in both process(1st argument of sem_open()).
>>>>>>>>>
>>>>>>>>> Please suggest to create semaphore (cross-processes).
>>>>>>>>
>>>>>>>> POSIX unnamed semaphores are not supported.
>>>>>>>>
>>>>>>>> Use either POSIX named semaphores, or use System V semaphores:
>>>>>>>>
>>>>>>>> man sem_open
>>>>>>>> man semget
>>>>>>>>
>>>>>>>> -- Terry
>>>>>>>>
>>>>>>>
>>>>>
>>>
>
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