Re: Semaphore
Re: Semaphore
- Subject: Re: Semaphore
- From: "Rakesh Singhal" <email@hidden>
- Date: Sun, 30 Nov 2008 16:55:51 +0530
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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