Re: Semaphore
Re: Semaphore
- Subject: Re: Semaphore
- From: "Rakesh Singhal" <email@hidden>
- Date: Mon, 1 Dec 2008 08:45:41 +0530
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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