Re: Semaphore
Re: Semaphore
- Subject: Re: Semaphore
- From: "Rakesh Singhal" <email@hidden>
- Date: Mon, 8 Dec 2008 17:53:41 +0530
I have put 2 dynamic libraries in /usr/lib/ folder and trying to use
them using dlopen API. It is working fine with PPC 10.4.9 but I am
trying now on 10.5.4 Intel. I do knot know what is happening. It
shows:
dyld: Library not loaded:
/Developer/Library/PrivateFrameworks/ZeroLink.framework/Versions/A/ZeroLink
Referenced from: /myProject/myApp
Reason: image not found
Trace/BPT trap
Please suggest me.
Thanks in advance.
Regards
rksinghal
On Mon, Dec 1, 2008 at 10:11 AM, Rakesh Singhal
<email@hidden> wrote:
> 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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